这项工作得到了韩国国家研究基金会的研究补助金 (赠款号: 2017M2A2A6A01070858) 的支持。

1. 柠檬酸稳定金纳米粒子的合成
<ol><li>将两颈的圆底烧瓶 (250 毫升) 和一条带水的磁力搅拌棒洗净, 将浓盐酸和浓硝酸混合在3:1 的体积比上。 注意: 水溶液是极具腐蚀性的, 可能会导致爆炸或皮肤烧伤, 如果不处理极端谨慎。</li>
	<li>用去离子水彻底冲洗玻璃器皿, 除去残留的水酸。</li>
	<li>将120毫升的四氯金酸溶液 (HAuCl4, 1 毫米) 添加到双颈圆底烧瓶 (250 毫升) 中, 并在恒定搅拌下将其加热至回流。</li>
	<li>将12毫升柠檬酸钠三元 (35 毫米) 溶液快速地添加到双颈圆底烧瓶中, 并将所产生的混合物再回流20分钟, 以完全还原金盐。</li>
	<li>允许纳米粒子 (深红色) 的胶体悬浮冷却到室温。</li>
	<li>使用石英试管 (1 厘米路径长度), 用紫外可见光谱测量金纳米粒子 (AuNPs) 的浓度, 波长为 520 nm (消光系数为 2.8 x 108)。</li>
	<li>在碳包覆的铜网 (400 目) 上添加一滴 AuNPs 悬浮液, 并在室温下干燥。用透射电镜 (TEM) 测量 AuNPs 的大小。</li>
	<li>保持胶体金纳米粒子悬浮在4摄氏度。</li>
</ol>2. 混合膜的制备 (金凸轮)
<ol><li>用注射器装置制备金纳米粒子--嵌入式膜过滤器<ol>
<li>洗一层醋酸纤维素膜 (孔径: 0.45 微米, 直径:25 毫米), 用去离子水 (10 毫升) 的过滤单元支持三次。</li>
		<li>用无菌注射器 (20 毫升) 提取10毫升的柠檬酸稳定 AuNPs (10 nM), 并将其缓慢添加到预冲洗的醋酸纤维素膜过滤器 (图 1)。</li>
		<li>用10毫升去离子水冲洗过滤器三次以去除非固定化 AuNPs。 注: 固定在醋酸纤维素膜上的 AuNPs 是高度稳定的, 因此, 在环境条件下可以储存几个星期的金凸轮, 而不会失去其化学性质或稳定性。</li>
	</ol>
</li>
	<li>真空泵制备金纳米颗粒膜过滤器的研究<ol>
<li>将醋酸纤维素膜 (孔径: 0.45 微米, 直径:47 毫米) 与过滤器支架烧结玻璃支架 (直径:40 毫米) 和一个分级漏斗 (300 毫升) 之间。</li>
		<li>将烧结玻璃支架和分级漏斗的组合单元连接到回收瓶 (500 毫升) 和真空泵。</li>
		<li>加入10毫升柠檬酸稳定的 AuNPs (10 nM) 进入毕业漏斗, 然后应用真空, 直到所有的 AuNPs 通过醋酸纤维素膜 (大约二十年代)。</li>
		<li>重复相同的步骤 (步骤 2.2.3) 在膜的另一侧, 以固定 AuNPs 的两侧的膜。</li>
		<li>利用扫描电镜 (SEM) 在高性能条件下对金凸轮表面进行分析, 其加速电压可达15伏 (图 2d)。 注: 为了在高盐条件下对金凸轮上的纳米粒子稳定性进行检查, 将复合膜浸入1.0 米氯化钠溶液中2小时, 然后进行目视检查, 以确定金凸轮的稳定性。</li>
	</ol>
</li>
</ol>3. 用金凸轮在间歇系统中吸附放射性碘
<ol><li>稀释放射性碘 ([125I] 奈, 2.2 MBq) 在3毫升纯净的水, 1.0 M 氯化钠, 或10毫微米奈和增加每个解答入培养皿 (50 毫米直径 x 15 毫米高度)。 注意: 氧化放射性碘可能是挥发性的, 必须用适当的铅盾牌和铅瓶处理。所有放射化学步骤都应在通风良好的木炭过滤罩内进行, 实验过程需要通过放射性探测器进行监测。</li>
	<li>将用真空过滤器制备的金凸轮置于放射性碘溶液中, 在室温下轻轻摇动。</li>
	<li>在给定时间点 (0, 5, 10, 30, 60, 120 分钟) 从培养皿中提取 10 ul 的放射性碘溶液, 用自动γ计数器测量整除的放射性。</li>
	<li>120分钟后用纯净水冲洗金凸轮, 然后用自动γ计数器测量膜上的放射性物质 (图 3)。</li>
</ol>4. 连续流动条件下放射性碘的脱盐
<ol><li>利用金凸轮过滤器去除放射性碘阴离子 (125I.)<ol>
<li>将放射性碘 (3.7 MBq) 溶解于纯净水50毫升, PBS 1x, 1.0 米氯化钠, 0.1 米氢氧化钠, 0.1 米 HCl, 10 毫米中海, 10 毫米 SrCl2, 合成尿, 或海水。</li>
		<li>使用注射器泵 (图 1), 用无菌注射器 (50 毫升) 提取每种溶液的50毫升, 并通过金凸轮过滤单元, 流速约为1.5 毫升/秒。</li>
		<li>将滤液的5毫升转移到塑料瓶中, 以量化溶液中的放射性。</li>
		<li>使用自动γ计数器测量滤液溶液中残余放射性的量 (图 4)。</li>
	</ol>
</li>
	<li>金凸轮滤波器的复用性测试<ol>
<li>将放射性碘溶解于合成尿液或海水中 (3.7 MBq/50 毫升)。</li>
		<li>提取50毫升的溶液与无菌注射器 (50 毫升), 并添加到金凸轮过滤单元的流速约1.5 毫升/秒使用注射器泵。</li>
		<li>使用单一的金凸轮滤波器单元重复相同的过滤过程 (步骤 4.2.2) 七次。</li>
		<li>将滤液的5毫升转移到塑料瓶中, 以量化溶液中的放射性。</li>
		<li>用自动γ计数器测量七滤液溶液中的放射性含量。</li>
	</ol>
</li>
</ol>

<ol>
	<li>Ojovan, M. I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Handbook of Advanced Radioactive Waste Conditioning Technologies. , (2011).</li><li>Abdel Rahman, R. O., Ibrahim, H. A., Hung, Y. -. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Liquid+Radioactive+Wastes+Treatment:+A+Review.">Liquid Radioactive Wastes Treatment: A Review.</a> Water. 3, 551-565 (2011).</li><li>Khayet, M., Matsuura, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Radioactive+decontamination+of+water.">Radioactive decontamination of water.</a> Desalination. 321, 1-2 (2013).</li><li>McLaughlin, P. D., Jones, B., Maher, M. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+update+on+radioactive+release+and+exposures+after+the+Fukushima+Dai-ichi+nuclear+disaster.">An update on radioactive release and exposures after the Fukushima Dai-ichi nuclear disaster.</a> The British Journal of Radiolog. 85, 1222-1225 (2012).</li><li>Chernobyl Forum Expert Group 'Environment'. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Environmental+Consequences+of+the+Chernobyl+Accident+and+their+Remediation:+Twenty+Years+of+Experience.">Environmental Consequences of the Chernobyl Accident and their Remediation: Twenty Years of Experience.</a> International Atomic Energy Agency. , (2006).</li><li>Hou, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Iodine-129+in+seawater+offshore+Fukushima:+distribution,+inorganic+speciation,+sources,+and+budget.">Iodine-129 in seawater offshore Fukushima: distribution, inorganic speciation, sources, and budget.</a> Environmental Science &amp; Technology. 47, 3091-3098 (2013).</li><li>Mu, W., Yu, Q., Li, X., Wei, H., Jian, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Adsorption+of+radioactive+iodine+on+surfactant-modified+sodium+niobate.">Adsorption of radioactive iodine on surfactant-modified sodium niobate.</a> RSC Advances. 6, 81719-81725 (2016).</li><li>Yang, D., Liu, H., Liu, L., Sarina, S., Zheng, Z., Zhu, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Silver+oxide+nanocrystals+anchored+on+titanate+nanotubes+and+nanofibers:+promising+candidates+for+entrapment+of+radioactive+iodine+anions.">Silver oxide nanocrystals anchored on titanate nanotubes and nanofibers: promising candidates for entrapment of radioactive iodine anions.</a> Nanoscale. 5, 11011-11018 (2013).</li><li>Yang, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Capture+of+radioactive+cesium+and+iodide+ions+from+water+by+using+titanate+nanofibers+and+nanotubes.">Capture of radioactive cesium and iodide ions from water by using titanate nanofibers and nanotubes.</a> Angewandte Chemie International Edition. 50, 10594-10598 (2011).</li><li>Cheng, Q., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Adsorption+of+gaseous+radioactive+iodine+by+Ag/13X+zeolite+at+high+temperatures.">Adsorption of gaseous radioactive iodine by Ag/13X zeolite at high temperatures.</a> Journal of Radioanalytical and Nuclear Chemistry. 303, 1883-1889 (2015).</li><li>Bennett, T. D., Saines, P. J., Keen, D. A., -C, T. a. n. J., Cheetham, A. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ball-Milling-Induced+Amorphization+of+Zeolitic+Imidazolate+Frameworks+(ZIFs)+for+the+Irreversible+Trapping+of+Iodine.">Ball-Milling-Induced Amorphization of Zeolitic Imidazolate Frameworks (ZIFs) for the Irreversible Trapping of Iodine.</a> Chemistry - A European Journal. 19, 7049-7055 (2013).</li><li>Huang, P. S., Kuo, C. H., Hsieh, C. C., Horng, Y. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Selective+capture+of+volatile+iodine+using+amorphous+molecular+organic+solids.">Selective capture of volatile iodine using amorphous molecular organic solids.</a> Chemical Communications. 48, 3227-3229 (2012).</li><li>Chapman, K. W., Chupas, P. J., Nenoff, T. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Radioactive+Iodine+Capture+in+Silver-Containing+Mordenites+through+Nanoscale+Silver+Iodide+Formation.">Radioactive Iodine Capture in Silver-Containing Mordenites through Nanoscale Silver Iodide Formation.</a> Journal of the American Chemical Society. 132, 8897-8899 (2010).</li><li>Watanabe, Y., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Novel+Long-Term+Immobilization+Method+for+Radioactive+Iodine-129+Using+a+Zeolite/Apatite+Composite+Sintered+Body.">Novel Long-Term Immobilization Method for Radioactive Iodine-129 Using a Zeolite/Apatite Composite Sintered Body.</a> ACS Applied Materials &amp; Interfaces. 1, 1579-1584 (2009).</li><li>Massasso, G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Molecular+iodine+adsorption+within+Hofmann-type+structures+M(L)[M'(CN)4]+(M+=+Ni,+Co;+M'+=+Ni,+Pd,+Pt):+impact+of+their+composition.">Molecular iodine adsorption within Hofmann-type structures M(L)[M'(CN)4] (M = Ni, Co; M' = Ni, Pd, Pt): impact of their composition.</a> Dalton Transactions. 44, 19357-19369 (2015).</li><li>Falaise, C., Volkringer, C., Facqueur, J., Bousquet, T., Gasnot, L., Loiseau, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Capture+of+iodine+in+highly+stable+metal-organic+frameworks:+a+systematic+study.">Capture of iodine in highly stable metal-organic frameworks: a systematic study.</a> Chemical Communications. 49, 10320-10322 (2013).</li><li>Sava, D. F., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Capture+of+Volatile+Iodine,+a+Gaseous+Fission+Product,+by+Zeolitic+Imidazolate+Framework-8.">Capture of Volatile Iodine, a Gaseous Fission Product, by Zeolitic Imidazolate Framework-8.</a> Journal of the American Chemical Society. 133, 12398-12401 (2011).</li><li>Zhang, Z. J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+new+type+of+polyhedron-based+metal-organic+frameworks+with+interpenetrating+cationic+and+anionic+nets+demonstrating+ion+exchange,+adsorption+and+luminescent+properties.">A new type of polyhedron-based metal-organic frameworks with interpenetrating cationic and anionic nets demonstrating ion exchange, adsorption and luminescent properties.</a> Chemical Communications. 47, 6425-6427 (2011).</li><li>Li, G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Highly+efficient+I2+capture+by+simple+and+low-cost+deep+eutectic+solvents.">Highly efficient I2 capture by simple and low-cost deep eutectic solvents.</a> Green Chemistry. 18, 2522-2527 (2016).</li><li>Yan, C., Mu, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Investigation+of+ionic+liquids+for+efficient+removal+and+reliable+storage+of+radioactive+iodine:+a+halogen-bonding+case.">Investigation of ionic liquids for efficient removal and reliable storage of radioactive iodine: a halogen-bonding case.</a> Physical Chemistry Chemical Physics. 16, 5071-5075 (2014).</li><li>Choi, M. H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficient+bioremediation+of+radioactive+iodine+using+biogenic+gold+nanomaterial-containing+radiation-resistant+bacterium,+Deinococcus+radiodurans+R1.">Efficient bioremediation of radioactive iodine using biogenic gold nanomaterial-containing radiation-resistant bacterium, Deinococcus radiodurans R1.</a> Chemical Communications. 53, 3937-3940 (2017).</li><li>Kim, Y. H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tumor+targeting+and+imaging+using+cyclic+RGD-PEGylated+gold+nanoparticle+probes+with+directly+conjugated+iodine-125.">Tumor targeting and imaging using cyclic RGD-PEGylated gold nanoparticle probes with directly conjugated iodine-125.</a> Small. 7, 2052-2060 (2011).</li><li>Choi, M. H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Gold-Nanoparticle-Immobilized+Desalting+Columns+for+Highly+Efficient+and+Specific+Removal+of+Radioactive+Iodine+in+Aqueous+Media.">Gold-Nanoparticle-Immobilized Desalting Columns for Highly Efficient and Specific Removal of Radioactive Iodine in Aqueous Media.</a> ACS Applied Materials &amp; Interfaces. 8, 29227-29231 (2016).</li><li>Mushtaq, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficient+and+selective+removal+of+radioactive+iodine+anions+using+engineered+nanocomposite+membranes.">Efficient and selective removal of radioactive iodine anions using engineered nanocomposite membranes.</a> Environmental Science: Nano. 4, 2157-2163 (2017).</li><li>Awual, M. R., Ismael, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficient+gold(III)+detection,+separation+and+recovery+from+urban+mining+waste+using+a+facial+conjugate+adsorbent.">Efficient gold(III) detection, separation and recovery from urban mining waste using a facial conjugate adsorbent.</a> Sensors and Actuators B: Chemical. 196, 457-466 (2014).</li><li>Awual, M. R., Hasan, M. M., Naushad, M., Shiwaku, H., Yaita, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Preparation+of+new+class+composite+adsorbent+for+enhanced+palladium(II)+detection+and+recovery.">Preparation of new class composite adsorbent for enhanced palladium(II) detection and recovery.</a> Sensors and Actuators B: Chemical. 209, 790-797 (2015).</li><li>Awual, M. R., Hasan, M. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fine-tuning+mesoporous+adsorbent+for+simultaneous+ultra-trace+palladium(II)+detection,+separation+and+recovery.">Fine-tuning mesoporous adsorbent for simultaneous ultra-trace palladium(II) detection, separation and recovery.</a> Journal of Industrial and Engineering Chemistry. 21, 507-515 (2015).</li><li>Awual, M. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ring+size+dependent+crown+ether+based+mesoporous+adsorbent+for+high+cesium+adsorption+from+wastewater.">Ring size dependent crown ether based mesoporous adsorbent for high cesium adsorption from wastewater.</a> Chemical Engineering Journal. 303, 539-546 (2016).</li><li>Awual, M. R., Miyazaki, Y., Taguchi, T., Shiwaku, H., Yaita, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Encapsulation+of+cesium+from+contaminated+water+with+highly+selective+facial+organic-inorganic+mesoporous+hybrid+adsorbent.">Encapsulation of cesium from contaminated water with highly selective facial organic-inorganic mesoporous hybrid adsorbent.</a> Chemical Engineering Journal. 291, 128-137 (2016).</li><li>Awual, M. R., Yaita, T., Taguchi, T., Shiwaku, H., Suzuki, S., Okamoto, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Selective+cesium+removal+from+radioactive+liquid+waste+by+crown+ether+immobilized+new+class+conjugate+adsorbent.">Selective cesium removal from radioactive liquid waste by crown ether immobilized new class conjugate adsorbent.</a> Journal of Hazardous Materials. 278, 227-235 (2014).</li><li>Awual, M. R., Suzuki, S., Taguchi, T., Shiwaku, H., Okamoto, Y., Yaita, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Radioactive+cesium+removal+from+nuclear+wastewater+by+novel+inorganic+and+conjugate+adsorbents.">Radioactive cesium removal from nuclear wastewater by novel inorganic and conjugate adsorbents.</a> Chemical Engineering Journal. 242, 127-135 (2014).</li><li>Awual, M. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficient+detection+and+adsorption+of+cadmium+(II)+ions+using+innovative+nano-composite+materials.">Efficient detection and adsorption of cadmium (II) ions using innovative nano-composite materials.</a> Chemical Engineering Journal. 343, 118-127 (2018).</li><li>Awual, M. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=New+type+mesoporous+conjugate+material+for+selective+optical+copper(II)+ions+monitoring+&amp;+removal+from+polluted+waters.">New type mesoporous conjugate material for selective optical copper(II) ions monitoring &amp; removal from polluted waters.</a> Chemical Engineering Journal. 307, 85-94 (2017).</li><li>Awual, M. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Novel+nanocomposite+materials+for+efficient+and+selective+mercury+ions+capturing+from+wastewater.">Novel nanocomposite materials for efficient and selective mercury ions capturing from wastewater.</a> Chemical Engineering Journal. 307, 456-465 (2017).</li><li>Awual, M. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Solid+phase+sensitive+palladium(II)+ions+detection+and+recovery+using+ligand+based+efficient+conjugate+nanomaterials.">Solid phase sensitive palladium(II) ions detection and recovery using ligand based efficient conjugate nanomaterials.</a> Chemical Engineering Journal. 300, 264-272 (2016).</li><li>Awual, M. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Assessing+of+lead(III)+capturing+from+contaminated+wastewater+using+ligand+doped+conjugate+adsorbent.">Assessing of lead(III) capturing from contaminated wastewater using ligand doped conjugate adsorbent.</a> Chemical Engineering Journal. 289, 65-73 (2016).</li><li>Awual, M. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+novel+facial+composite+adsorbent+for+enhanced+copper+(II)+detection+and+removal+from+wastewater.">A novel facial composite adsorbent for enhanced copper (II) detection and removal from wastewater.</a> Chemical Engineering Journal. 266, 368-375 (2015).</li><li>Kaushik, M., Moores, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Review:+nanocelluloses+as+versatile+supports+for+metal+nanoparticles+and+their+applications+in+catalysis.">Review: nanocelluloses as versatile supports for metal nanoparticles and their applications in catalysis.</a> Green Chemistry. 18, 622-637 (2016).</li><li>Jang, H., Kim, Y. K., Ryoo, S. R., Kim, M. H., Min, D. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Facile+synthesis+of+robust+and+biocompatible+gold+nanoparticles.">Facile synthesis of robust and biocompatible gold nanoparticles.</a> Chemical Communication. 46, 583-585 (2010).</li><li>Bolisetty, S., Mezzenga, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Amyloid-carbon+hybrid+membranes+for+universal+water+purification.">Amyloid-carbon hybrid membranes for universal water purification.</a> Nature Nanotechnology. 11, 365-371 (2016).</li><li>Zakrzewska-Trznadel, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Advances+in+membrane+technologies+for+the+treatment+of+liquid+radioactive+waste.">Advances in membrane technologies for the treatment of liquid radioactive waste.</a> Desalination. 321, 119-130 (2013).</li><li>Rana, D., Matsuura, T., Kassim, M. A., Ismail, A. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Radioactive+decontamination+of+water+by+membrane+processes+-+A+review.">Radioactive decontamination of water by membrane processes - A review.</a> Desalination. 321, 77-92 (2013).</li></ol>

作者没有什么可透露的。

近年来, 根据其吸附技术25、26的具体功能, 开发了各种工程化纳米材料和膜, 以去除水中的有害放射性金属和重金属,27,28,29,30,31,32,33,34,...

几十年来, 医疗机构、研究设施和核反应堆产生了大量放射性液体废料。这些污染物常常是对环境和人类健康的明显威胁,1、2、3。特别是放射性碘被认为是核电站事故中最危险的因素之一。例如, 一份关于福岛和切尔诺贝利核反应堆的环境报告表明, 释放的放射性 iodines 的数量包括131i (t1/2 = 8.02 天) 和129i (t1/2 =1570万年) 对环境大于其他放射性核素4,5。特别是, 这些放射性同位素的暴露导致了人体甲状腺6的高吸收和富集。此外, 释放的放射性 iodines 可导致土壤、海水和地下水的严重污染, 因为它们在水中的溶解度很高。因此, 研究了大量使用各种无机和有机吸附剂的修复过程, 以捕获含水废物7、8、9、10中的放射性 iodines。,11,12,13,14,15,16,17,18,19,20. 尽管为开发先进的吸附剂系统作出了广泛的努力, 但在连续流动条件下, 建立一种能表现出令人满意性能的净化方法非常有限。最近, 我们报告了一个新的脱盐过程, 显示良好的去除效率, 离子选择性, 可持续性, 并利用纳米金纳米复合材料 (AuNPs)21,22,23. 在其中, 金纳米粒子--嵌入的醋酸纤维素膜 (Au 凸轮) 促进了与现有吸附剂材料相比的连续流系统中碘离子的高效脱盐。此外, 整个程序可以在短时间内完成, 这是处理医疗和工业应用后产生的核废料的另一个好处。本手稿的总体目标是提供一步一步的协议, 为准备的金凸轮24。我们还演示了一个快速和方便的过滤过程中的离子选择性捕获放射性碘使用工程复合膜。本报告中的详细议定书将为纳米材料在环境科学研究领域中的应用提供有益的参考。

<table border="0" cellpadding="0" cellspacing="0" style="width:813px;" width="813">
	<colgroup>
		<col />
		<col />
		<col />
		<col />
	</colgroup>
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:351px;">Hydrochloric acid</td>
			<td style="width:177px;">DUKSAN</td>
			<td style="width:119px;">1129</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Nitric acid&#160;</td>
			<td>JUNSEI</td>
			<td style="width:119px;">37335-1250</td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">Chloroautic chloride trihydrate (HAuCl4&#183;3H2O)</td>
			<td>Sigma Aldrich</td>
			<td style="width:119px;">254169</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sodium citrate tribasic dihydrate</td>
			<td>Sigma Aldrich</td>
			<td style="width:119px;">71402</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;">[125I]NaI&#160;</td>
			<td>Perkin-Elmer</td>
			<td style="width:119px;">NEZ033A010MC</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sodium chloride</td>
			<td>Sigma Aldrich</td>
			<td style="width:119px;">S9888</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sodium iodide</td>
			<td>Sigma Aldrich</td>
			<td style="width:119px;">383112</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sodium hydroxide</td>
			<td>Sigma Aldrich</td>
			<td style="width:119px;">S5881</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Lithium L-lactate</td>
			<td>Sigma Aldrich</td>
			<td style="width:119px;">L2250</td>
			<td>Synthetic urine</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Citric acid</td>
			<td>Sigma Aldrich</td>
			<td style="width:119px;">C1909</td>
			<td>Synthetic urine</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:351px;">Sodium hydrogen carbonate</td>
			<td>JUNSEI</td>
			<td style="width:119px;">43305-1250</td>
			<td>Synthetic urine</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:351px;">Urea</td>
			<td>Sigma Aldrich</td>
			<td style="width:119px;">U1250</td>
			<td>Synthetic urine</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Calcium chloride</td>
			<td>JUNSEI</td>
			<td style="width:119px;">18230-0301</td>
			<td>Synthetic urine</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Magnesium sulfate</td>
			<td>SAMCHUN</td>
			<td style="width:119px;">M0146</td>
			<td>Synthetic urine</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Potassium dihydrogen phosphate</td>
			<td>JUNSEI</td>
			<td style="width:119px;">84185A1250</td>
			<td>Synthetic urine</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Dipotassium hydrogen phosphate</td>
			<td>JUNSEI</td>
			<td style="width:119px;">84120-1250</td>
			<td>Synthetic urine</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sodium sulfate</td>
			<td>JUNSEI</td>
			<td style="width:119px;">83260-1250</td>
			<td>Synthetic urine</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Ammonium chloride</td>
			<td>Sigma Aldrich</td>
			<td style="width:119px;">A9434</td>
			<td>Synthetic urine</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sea water</td>
			<td>Sigma Aldrich</td>
			<td style="width:119px;">S9148</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">1x PBS</td>
			<td>Thermo</td>
			<td style="width:119px;">SH30256.01</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Cellulose acetate membranes (pore size: 0.20 &#956;m, diameter: 25 mm)</td>
			<td>Advantec MFS</td>
			<td style="width:119px;">25CS045AS</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Cellulose acetate membranes (pore size: 0.20 &#956;m, diameter: 47 mm)</td>
			<td>Advantec MFS</td>
			<td style="width:119px;">C045A047A</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">47 mm Glass Microanalysis Holders</td>
			<td>Advantec MFS</td>
			<td style="width:119px;">KG47(311400)</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Petri dish (50 mm diameter &#180; 15 mm height)</td>
			<td>SPL</td>
			<td style="width:119px;">10050</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;">Gamma counter</td>
			<td>Perkin-Elmer</td>
			<td>2480 WIZARD2</td>
			<td>Model number</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">UV-vis spectrophotometer</td>
			<td>Thermo</td>
			<td style="width:119px;">GENESYS 10</td>
			<td>Model number</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Transmission electron microscopy</td>
			<td style="width:177px;">Hitachi</td>
			<td style="width:119px;">H-7650</td>
			<td>Model number</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:351px;">Field Emission Scanning electron microscope</td>
			<td style="width:177px;">FEI</td>
			<td style="width:119px;">Verios 460L</td>
			<td>Model number</td>
		</tr>
	</tbody>
</table>

an efficient method for selective desalination of radioactive iodine anions by using gold nanoparticles-embedded membrane filter

在这里, 我们演示了一个详细的协议, 制备纳米材料-嵌入复合膜及其在高效和离子选择性去除放射性 iodines 的应用。利用柠檬酸稳定的金纳米粒子 (平均直径:13 nm) 和醋酸纤维素膜, 可以很容易地制备出金纳米颗粒的醋酸纤维素膜 (Au 凸轮)。在高浓度无机盐和有机分子的存在下, 金凸轮上的纳米吸附剂高度稳定。水溶液中的碘离子可以迅速被这种工程膜捕获。通过采用含金凸轮过滤单元的过滤工艺, 在短时间内实现了优异的去除效率 (> 99%) 以及离子选择性脱盐效果。而且, 在没有显著降低性能的情况下, Au 凸轮提供了良好的可重用性。结果表明, 采用工程化混合膜技术的现有工艺将是对液体废弃物中放射性碘进行大规模净化的一个有前途的过程。

我们展示了用柠檬酸稳定的 AuNPs 和醋酸纤维素膜制作金凸轮的简单方法 (图 1a)。用 SEM 观察了金凸轮的表面, 表明纳米材料在纤维素纤维上稳定地结合在一起 (图 2)。在膜上被嵌顿的纳米颗粒保持稳定, 不通过连续洗涤, 如1.0 米氯化钠等水溶液释放。金凸轮的吸附能力约为1克 AuNPs24μmol 碘负离子的?...

Watch this Scientific Journal Video about An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter at JoVE.com

An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter

利用金纳米颗粒固定化醋酸纤维素膜过滤器, 对几种水溶液中的放射性碘进行快速、离子选择性脱盐的有效方法进行了描述。

用金纳米粒子-嵌入式膜过滤法选择性脱盐放射性碘阴离子的有效方法

Here, we demonstrate a detail protocol for the preparation of nanomaterials-embedded composite membranes and its application to the efficient and ...

an-efficient-method-for-selective-desalination-radioactive-iodine

Research

JoVE Journal

Engineering

7.3K 次观看.  Korea Atomic Energy Research Institute. 利用金纳米颗粒固定化醋酸纤维素膜过滤器, 对几种水溶液中的放射性碘进行快速、离子选择性脱盐的有效方法进行了描述。

视频: An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter

Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment

The wettability of silicon (Si) is one of the important parameters in the technology of surface functionalization of this material and fabrication of biosensing devices. We report on a protocol of using KrF and ArF lasers irradiating Si (001) samples immersed in a liquid environment with low number of pulses and operating at moderately low pulse fluences to induce Si wettability modification. Wafers immersed for up to 4 hr in a 0.01% H2O2/H2O solution did not show measurable change in their initial contact angle (CA) ~75&#176;. However, the 500-pulse KrF and ArF lasers irradiation of such wafers in a microchamber filled with 0.01% H2O2/H2O solution at 250 and 65 mJ/cm2, respectively, has decreased the CA to near 15&#176;, indicating the formation of a superhydrophilic surface. The formation of OH-terminated Si (001), with no measurable change of the wafer&#8217;s surface morphology, has been confirmed by X-ray photoelectron spectroscopy and atomic force microscopy measurements. The selective area irradiated samples were then immersed in a biotin-conjugated fluorescein-stained nanospheres solution for 2 hr, resulting in a successful immobilization of the nanospheres in the non-irradiated area. This illustrates the potential of&#160;the method for selective area biofunctionalization and fabrication of advanced Si-based biosensing architectures. We also describe a similar protocol of irradiation of wafers immersed in methanol (CH3OH) using ArF laser operating at pulse fluence of 65 mJ/cm2 and in situ formation of a strongly hydrophobic surface of Si (001) with the CA of 103&#176;. The XPS results indicate ArF laser induced formation of Si&#8211;(OCH3)x compounds responsible for the observed hydrophobicity. However, no such compounds were found by XPS on the Si surface irradiated by KrF laser in methanol, demonstrating the inability of the KrF laser to photodissociate methanol and create -OCH3 radicals.

We report on a process of in situ alteration of HF treated Si (001) surface into a hydrophilic or hydrophobic state by irradiating samples in microfluidic chambers filled with&#160;H2O2/H2O solution (0.01%-0.5%) or methanol solutions using pulsed UV laser of a relative low pulse fluence.

硅表面润湿性的选择区域改性脉冲紫外激光照射在液体环境

The wettability of silicon (Si) is one of the important parameters in the technology of surface functionalization of this material and fabrication of ...

科研

工程学

Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores

Developing low-cost, efficient processes for recovering and recycling palladium, gold and cobalt metals from urban mine remains a significant challenge in industrialized countries. Here, the development of optical mesosensors/adsorbents (MSAs) for efficient recognition and selective recovery of Pd(II), Au(III), and Co(II) from urban mine was achieved. A simple, general method for preparing MSAs based on using high-order mesoporous monolithic scaffolds was described. Hierarchical cubic Ia3d wagon-wheel-shaped MSAs were fabricated by anchoring chelating agents (colorants) into three-dimensional pores and micrometric particle surfaces of the mesoporous monolithic scaffolds. Findings show, for the first time, evidence of controlled optical recognition of Pd(II), Au(III), and Co(II) ions and a highly selective system for recovery of Pd(II) ions (up to ~95%) in ores and industrial wastes. Furthermore, the controlled assessment processes described herein involve evaluation of intrinsic properties (e.g., visual signal change, long-term stability, adsorption efficiency, extraordinary sensitivity, selectivity, and reusability); thus, expensive, sophisticated instruments are not required. Results show evidence that MSAs will attract worldwide attention as a promising technological means of recovering and recycling palladium, gold and cobalt metals.

Because of the importance and extensive use of palladium, gold and cobalt metals in high-technology equipment, their recovery and recycling constitute an important industrial challenge. The metal recovery system described herein is a simple, low-cost means for the effective detection, removal, and recovery of these metals from the urban mine.

检测和钯的回收，从城市矿山黄金和钴金属使用标有纳米货车车轮形的孔隙新型传感器/吸附剂

Developing low-cost, efficient processes for recovering and recycling palladium, gold and cobalt metals from urban mine remains a significant challenge in ...

Multifunctional Hybrid Fe2O3-Au Nanoparticles for Efficient Plasmonic Heating

One of the most widely used methods for manufacturing colloidal gold nanospherical particles involves the reduction of chloroauric acid (HAuCl4) to neutral gold Au(0) by reducing agents, such as sodium citrate or sodium borohydride. The extension of this method to decorate iron oxide or similar nanoparticles with gold nanoparticles to create multifunctional hybrid Fe2O3-Au nanoparticles is straightforward. This approach yields fairly good control over Au nanoparticle dimensions and loading onto Fe2O3. Additionally, the Au metal size, shape, and loading can easily be tuned by changing experimental parameters (e.g., reactant concentrations, reducing agents, surfactants, etc.). An advantage of this procedure is that the reaction can be done in air or water, and, in principle, is amenable to scaling up. The use of such optically tunable Fe2O3-Au nanoparticles for hyperthermia studies is an attractive option as it capitalizes on plasmonic heating of gold nanoparticles tuned to absorb light strongly in the VIS-NIR region. In addition to its plasmonic effects, nanoscale Au provides a unique surface for interesting chemistries and catalysis. The Fe2O3 material provides additional functionality due to its magnetic property. For example, an external magnetic field could be used to collect and recycle the hybrid Fe2O3-Au nanoparticles after a catalytic experiment, or alternatively, the magnetic Fe2O3 can be used for hyperthermia studies through magnetic heat induction. The photothermal experiment described in this report measures bulk temperature change and nanoparticle solution mass loss as functions of time using infrared thermocouples and a balance, respectively. The ease of sample preparation and the use of readily available equipment are distinct advantages of this technique. A caveat is that these photothermal measurements assess the bulk solution temperature and not the surface of the nanoparticle where the heat is transduced and the temperature is likely to be higher.

Multifunctional Hybrid Fe2O3-Au Nanoparticles for Efficient Plasmonic Heating

We describe the synthesis and properties of multifunctional Fe2O3-Au nanoparticles produced by a wet chemical approach and investigate their photothermal properties using laser irradiation. The composite Fe2O3-Au nanoparticles retain the properties of both materials, creating a multifunctional structure with excellent magnetic and plasmonic properties.

多功能混合铁<sub&gt; 2</sub&gt; 0<sub&gt; 3</sub&gt; -Au纳米粒子高效的电浆暖气

One of the most widely used methods for manufacturing colloidal gold nanospherical particles involves the reduction of chloroauric acid (HAuCl4) to ...

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Here, we demonstrate the incorporation of monovalent cation additives into CH3NH3PbI3 perovskite in order to adjust the optical, excitonic, and electrical properties. The possibility of doping was investigated by adding monovalent cation halides with similar ionic radii to Pb2+, including Cu+, Na+, and Ag+. A shift in the Fermi level and a remarkable decrease of sub-bandgap optical absorption, along with a lower energetic disorder in the perovskite, was achieved. An order-of-magnitude enhancement in the bulk hole mobility and a significant reduction of transport activation energy within an additive-based perovskite device was attained. The confluence of the aforementioned improved properties in the presence of these cations led to an enhancement in the photovoltaic parameters of the perovskite solar cell. An increase of 70 mV in open circuit voltage for AgI and a 2 mA/cm2 improvement in photocurrent density for NaI- and CuBr-based solar cells were achieved compared to the pristine device. Our work paves the way for further improvements in the optoelectronic quality of CH3NH3PbI3 perovskite and subsequent devices. It highlights a new avenue for investigations on the role of dopant impurities in crystallization and controls the electronic defect density in perovskite structures.

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

Here, we present a protocol to adjust the properties of solution-processed CH3NH3PbI3 through the incorporation of monovalent cation additives in order to achieve highly efficient perovskite solar cells.

CH的单价阳离子兴奋剂<sub&gt; 3</sub&gt; NH<sub&gt; 3</sub&gt;碘化铅<sub&gt; 3</sub&gt;对钙钛矿型高效太阳能电池

Here, we demonstrate the incorporation of monovalent cation additives into CH3NH3PbI3 perovskite in order to adjust the optical, excitonic, and electrical ...

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

The presented method is used to locate subsurface defects oriented perpendicularly to the surface. To achieve this, we create destructively interfering thermal wave fields that are disturbed by the defect. This effect is measured and used to locate the defect. We form the destructively interfering wave fields by using a modified projector. The original light engine of the projector is replaced with a fiber-coupled high-power diode laser. Its beam is shaped and aligned to the projector&#39;s spatial light modulator and optimized for optimal optical throughput and homogeneous projection by first characterizing the beam profile, and, second, correcting it mechanically and numerically. A high-performance infrared (IR) camera is set up according to the tight geometrical situation (including corrections of the geometrical image distortions) and the requirement to detect weak temperature oscillations at the sample surface. Data acquisition can be performed once a synchronization between the individual thermal wave field sources, the scanning stage, and the IR camera is established by using a dedicated experimental setup which needs to be tuned to the specific material being investigated. During data post-processing, the relevant information on the presence of a defect below the surface of the sample is extracted. It is retrieved from the oscillating part of the acquired thermal radiation coming from the so-called depletion line of the sample surface. The exact location of the defect is deduced from the analysis of the spatial-temporal shape of these oscillations in a final step. The method is reference-free and very sensitive to changes within the thermal wave field. So far, the method has been tested with steel samples but is applicable to different materials as well, in particular to temperature sensitive materials.

This method aims at locating vertical subsurface defects. Here, we couple a laser with a spatial light modulator and trigger its video input to heat a sample surface deterministically with two anti-phased modulated lines while acquiring highly resolved thermal images. The defect position is retrieved from evaluating thermal wave interference minima.

使用激光投射光热法构造加热的地下缺陷定位

The presented method is used to locate subsurface defects oriented perpendicularly to the surface. To achieve this, we create destructively interfering ...

Fabrication of Periodic Gold Nanocup Arrays Using Colloidal Lithography

Within recent years, the field of plasmonics has exploded as researchers have demonstrated exciting applications related to chemical and optical sensing in combination with new nanofabrication techniques. A plasmon is a quantum of charge density oscillation that lends nanoscale metals such as gold and silver unique optical properties. In particular, gold and silver nanoparticles exhibit localized surface plasmon resonances-collective charge density oscillations on the surface of the nanoparticle-in the visible spectrum. Here, we focus on the fabrication of periodic arrays of anisotropic plasmonic nanostructures. These half-shell (or nanocup) structures can exhibit additional unique light-bending and polarization-dependent optical properties that simple isotropic nanostructures cannot. Researchers are interested in the fabrication of periodic arrays of nanocups for a wide variety of applications such as low-cost optical devices, surface-enhanced Raman scattering, and tamper indication. We present a scalable technique based on colloidal lithography in which it is possible to easily fabricate large periodic arrays of nanocups using spin-coating and self-assembled commercially available polymeric nanospheres. Electron microscopy and optical spectroscopy from the visible to near-infrared (near-IR) was performed to confirm successful nanocup fabrication. We conclude with a demonstration of the transfer of nanocups to a flexible, conformal adhesive film.

We demonstrate the fabrication of periodic gold nanocup arrays using colloidal lithographic techniques and discuss the importance of nanoplasmonic films.

用胶体光刻制备周期性金 Nanocup 阵列

Within recent years, the field of plasmonics has exploded as researchers have demonstrated exciting applications related to chemical and optical sensing ...

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Here, we demonstrate the advantages of the laser Doppler vibrometer (LDV) over conventional techniques (the network analyzer), as well as the techniques to create an application-based microelectromechanical systems (MEMS) filter and how to use it efficiently (i.e., tuning the tuning-capability and avoiding both failure and stiction). LDV enables crucial measurements that are impossible with the network analyzer, such as higher mode detection (highly sensitive biosensor application) and resonance measurement for very small devices (fast prototyping). Accordingly, LDV was used to characterize the frequency tuning range and resonance frequency at different modes of the MEMS filters built for this study. This wide range frequency tuning mechanism is based simply on Joule heating from the embedded heaters and relatively high thermal stress with respect to the temperature of a fixed-fixed beam. However, we demonstrate that another limitation of this method is the resulting high thermal stress, which can burn the devices. Further improvement was achieved and shown for the first time in this study, such that the tuning capability was increased by 32% through an increase in the applied DC bias voltage (25 V to 35 V) between the two adjacent beams. This important finding eliminates the need for the extra Joule heating at the wider frequency tuning range. Another possible failure is through stiction and requirement of structure optimization: We propose a simple and easy technique of low frequency square wave signal application that can successfully separate the beams and eliminates the need for the more sophisticated and complicated methods given in the literature. The above findings necessitate a design methodology, and so we also provide an application-based design.

A protocol for a fixed-fixed beam design using a laser Doppler vibrometer (LDV), including the measurement of frequency tuning, modification of tuning capability, and avoidance of device failure and stiction, is presented. The superiority of the LDV method over the network analyzer is demonstrated due to its higher mode capability.

高效宽量程可调谐 MEMS 滤波器的设计与表征方法

Here, we demonstrate the advantages of the laser Doppler vibrometer (LDV) over conventional techniques (the network analyzer), as well as the techniques ...

Controllable Nucleation of Cavitation from Plasmonic Gold Nanoparticles for Enhancing High Intensity Focused Ultrasound Applications

In this study, plasmonic gold nanoparticles were simultaneously exposed to pulsed near-infrared laser light and high intensity focused ultrasound (HIFU) for the controllable nucleation of cavitation in tissue-mimicking gel phantoms. This in vitro protocol was developed to demonstrate the feasibility of this approach, for both enhancement of imaging and therapeutic applications for cancer. The same apparatus can be used for both imaging and therapeutic applications by varying the exposure duration of the HIFU system. For short duration exposures (10 &#181;s), broadband acoustic emissions were generated through the controlled nucleation of inertial cavitation around the gold nanoparticles. These emissions provide direct localization of nanoparticles. For future applications, these particles may be functionalized with molecular-targeting antibodies (e.g. anti-HER2 for breast cancer) and can provide precise localization of cancerous regions, complementing routine diagnostic ultrasound imaging. For continuous wave (CW) exposures, the cavitation activity was used to increase the localized heating from the HIFU exposures resulting in larger thermal damage in the gel phantoms. The acoustic emissions generated from inertial cavitation activity during these CW exposures was monitored using a passive cavitation detection (PCD) system to provide feedback of cavitation activity. Increased localized heating was only achieved through the unique combination of nanoparticles, laser light and HIFU. Further validation of this technique in pre-clinical models of cancer is necessary.

This protocol demonstrates the controllable nucleation of cavitation in gel phantoms, through simultaneous exposure to both near-infrared pulsed laser light and high intensity focused ultrasound (HIFU). The cavitation activity can then be used for enhancing imaging and/or therapeutic uses of HIFU.

等离子金纳米粒子空化的可控核增强高强度聚焦超声应用

In this study, plasmonic gold nanoparticles were simultaneously exposed to pulsed near-infrared laser light and high intensity focused ultrasound (HIFU) ...

Using Flexible Gold-Titanium Reaction Cells to Simulate Pressure-Dependent Microbial Activity in the Context of Subsurface Biomining

Laboratory studies investigating subsurface microbial processes, such as metal leaching in deep ore deposits (biomining), share common and challenging obstacles, including the special environmental conditions that need to be replicated, e.g., high pressure and in some cases acidic solutions. The former requires an experimental setup suitable for pressurization up to 100 bar, while the latter demands a fluid container with high chemical resistance against corrosion and unwanted chemical reactions with the container wall. To meet these conditions for an application in the field of in situ biomining, a special flexible gold-titanium reaction cell inside a rocking high-pressure reactor was used in this study. The described system allowed simulation of in situ biomining through sulfur-driven microbial iron reduction in an anoxic, pressure-controlled, highly chemically inert experimental environment. The flexible gold-titanium reaction cell can accommodate up to 100 mL of sample solution, which can be sampled at any given time point while the system maintains the desired pressure. Experiments can be performed on timescales ranging from hours to months. Assembling the high-pressure reactor system is fairly time consuming. Nevertheless, when complex and challenging (microbiological) processes occurring in the earth&#39;s deep subsurface in chemically aggressive fluids have to be investigated in the laboratory, the advantages of this system outweigh the disadvantages. The results found that even at high pressure the microbial consortium is active, but at significantly lower metabolic rates.

This protocol describes microbial experiments under elevated pressures to study in situ biomining processes. The experimental approach employs a rocking high-pressure reactor equipped with a gold-titanium reaction cell containing a microbial culture in an acidic, iron-rich medium.

使用柔性金钛反应细胞在地下生物采矿环境中模拟压力依赖微生物活性

Laboratory studies investigating subsurface microbial processes, such as metal leaching in deep ore deposits (biomining), share common and challenging ...

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

We present microfabrication protocols for rendering intrinsically wetting materials repellent to liquids (omniphobic) by creating gas-entrapping microtextures (GEMs) on them comprising cavities and pillars with reentrant and doubly reentrant features. Specifically, we use SiO2/Si as the model system and share protocols for two-dimensional (2D) designing, photolithography, isotropic/anisotropic etching techniques, thermal oxide growth, piranha cleaning, and storage towards achieving those microtextures. Even though the conventional wisdom indicates that roughening intrinsically wetting surfaces (&#952;o &#60; 90&#176;) renders them even more wetting (&#952;r &#60; &#952;o &#60; 90&#176;), GEMs demonstrate liquid repellence despite the intrinsic wettability of the substrate. For instance, despite the intrinsic wettability of silica &#952;o &#8776; 40&#176; for the water/air system, and &#952;o &#8776; 20&#176; for the hexadecane/air system, GEMs comprising cavities entrap air robustly on immersion in those liquids, and the apparent contact angles for the droplets are &#952;r &#62; 90&#176;. The reentrant and doubly reentrant features in the GEMs stabilize the intruding liquid meniscus thereby trapping the liquid-solid-vapor system in metastable air-filled states (Cassie states) and delaying wetting transitions to the thermodynamically-stable fully-filled state (Wenzel state) by, for instance, hours to months. Similarly, SiO2/Si surfaces with arrays of reentrant and doubly reentrant micropillars demonstrate extremely high contact angles (&#952;r &#8776; 150&#176;&#8211;160&#176;) and low contact angle hysteresis for the probe liquids, thus characterized as superomniphobic. However, on immersion in the same liquids, those surfaces dramatically lose their superomniphobicity and get fully-filled within &#60;1 s. To address this challenge, we present protocols for hybrid designs that comprise arrays of doubly reentrant pillars surrounded by walls with doubly reentrant profiles. Indeed, hybrid microtextures entrap air on immersion in the probe liquids. To summarize, the protocols described here should enable the investigation of GEMs in the context of achieving omniphobicity without chemical coatings, such as perfluorocarbons, which might unlock the scope of inexpensive common materials for applications as omniphobic materials. Silica microtextures could also serve as templates for soft materials.

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars

This work presents microfabrication protocols for achieving cavities and pillars with reentrant and doubly reentrant profiles on SiO2/Si wafers using photolithography and dry etching. Resulting microtextured surfaces demonstrate remarkable liquid repellence, characterized by robust long-term entrapment of air under wetting liquids, despite the intrinsic wettability of silica.