这项工作是由美国国立卫生研究院R21 EB008177-01A2和纽约大学阿布扎比（NYUAD）加强研究2013年基金微细加工，我们在表示感谢MIT的MTL的鼎力支持技术人员和詹姆斯·韦斯顿和NYUAD的尼古拉Giakoumidis他们的支持支持采取SEM照片分别建立一个分压器。在PDMS的设备制造在NYUAD的微细核心设施进行。最后，我们想从NYUAD中心感谢丽贝卡Pittam为视频拍摄和编辑数字奖学金。

1.胶体二氧化硅悬浮液珠的制备<ol><li> 为300nm和500nm的硅石珠粒悬浮液制剂 <ol><li>涡旋二氧化硅珠纸浆悬浮液（10％w / v的水溶液）30秒。以获得均匀悬浮液。共600微升储备悬浮液吸取到1.5ml试管离心它2600 xg离心1分钟。 </li><li>替换上清液用400μl1 mM磷酸钠缓冲液（PB，pH7.0）中。 </li><li>暂停硅珠成的15％，以1 mM磷酸钠溶液在pH 7.0经涡旋的最终浓度。 </li></ol></li><li> 聚表面官能化500纳米的二氧化硅羧基珠子（烯丙胺盐酸盐，PAH），并与聚（苯乙烯磺酸钠，PSS）聚电解质 <ol><li>暂停0.1用10ml 1M NaCl的（pH 7.0）中为1％（重量/体积）珠悬浮克与羧基500nm的二氧化硅珠粒。 </li><li>在1M NAC准备0.4％PAH（MW 65K）升通过在15ml 1M NaCl的溶解原液的300微升（20％w / v的水溶液）。通过在20毫升的1M NaCl溶液0.18克PSS溶解在1M NaCl的溶液制备0.9％的PSS（MW 70K）。涡旋都为1分钟的解决方案。以完全溶解聚电解质。 </li><li>加入200微升的PAH溶液9.8毫升1％的二氧化硅羧基珠子在15ml管以沉积具有羧基官能团上的二氧化硅珠粒带正电荷的聚电解质层。 VORTEX珠悬挂1分钟。孵育它在管旋转60分钟。在室温。 </li><li>离心珠悬浮液在1801 XG 1分钟。并用10毫升去离子水洗掉未结合的PAH五次。每个离心和除去上清液后，被致密地填充在管底部的小珠。加入8毫升DI水，以使珠可重悬于和到下一个离心机步骤洗掉现有之前破坏通过用2ml DI水剧烈移液珠丛。 </li><li>跟随对于PSS涂敷在1.2.3和1.2.4的步骤在珠子上沉积带负电荷的层。从1.2.4第5 次洗涤步骤除去DI水上清液之前的PSS的沉积后重新悬浮珠子9.8毫升1- M氯化钠的。 <ol><li>使用使用2-毫升1- M氯化钠的打破了珠丛在15ml试管的底部，然后加入8毫升1- M氯化钠的相同的蓬勃移液步骤。加入200μl的PSS的溶液9.8毫升沉积有单一的PAH层的二氧化硅珠粒。涡旋1分钟后和温育60分钟。在试管旋转器中，重复用DI水5洗涤步骤。 </li><li>使用根据制造商的方案，动态光散射系统，以验证已正确执行了聚电解质沉积过程测量之前和之后的每个聚电解质涂层珠的ζ电位（见表1）。 </li></ol></li><li>重复用DI水的单一的PSS层以下五个洗涤步骤用0.05％吐温20（15％重量/体积）中的微流体装置在使用之前，以提高其流动性的沉积和再悬浮于650微升1mM的磷酸钠缓冲液中的珠。 </li></ol></li><li>按照从1.2.5如上所述1.2.6为与胺官能团为500nm的二氧化硅珠粒沉积的PSS的单层的步骤。 </li></ol> 2.将PDMS微流控芯片的制备<ol><li> 硅主的微细 <ol><li>制造用的微细加工技术如下PDMS成型硅主。 <ol><li>旋涂1μm的薄光致抗蚀剂以4000rpm在硅片上。图案使用投影光刻（曝光时间170毫秒）和蚀刻700nm的深和2微米宽的平面纳米通道的层（作为nanotraps为二氧化硅珠）用反应性离子蚀刻。 </li><li>使用以下蚀刻参数达到3.5纳米/秒的刻蚀速率:CHF 3（45 SCCM），CF 4（15标准立方厘米），Ar（气体为100sccm），压力100毫乇，RF功率200W。 </li></ol></li><li>旋转涂布，以2000rpm的转速第二个为1微米厚的光刻胶层和执行对准先前图案nanotraps。通过接触光刻和硅的深反应离子蚀刻（DRIE）的微通道图案。使用DRIE参数26在表2中。 </li></ol></li><li> PDMS模具的制作 <ol><li> Silanize在真空罐O / N三氯硅烷（50微升）的硅主人。 注意:Tricholorosilane是有毒和腐蚀性的材料。总是在化学罩与适当的个人防护装备使用。 </li><li>在10混合基与固化剂:在硅烷化硅母1的比例，并投PDMS和在70℃下固化它用于在对流烘箱2小时。 </li><li>用后一个PL的等离子净化器取下，用小刀和等离子债券它的空白晶圆上的芯片主的PDMS板阿斯玛治疗在1分钟的等离子体清洁器。连接带沿边缘标记以下PDMS铸造步骤分割线。 </li><li>在真空罐子三氯硅烷（50微升）O / N Silanize的PDMS模具。 </li><li>施放的PDMS（碱:1的比例:在10固化剂）的硅烷化的PDMS模具，并在70℃下固化它用于在对流烘箱2小时。 </li></ol></li><li> 与PDMS器件的制造 <ol><li>剥去一起打上胶带分割线的PDMS模具硫化硅橡胶板。 </li><li>为1.5mm活检穿孔，清洁用胶带冲贮存器孔，冲洗用异丙醇（IPA）中，用氮气干燥。 </li><li>等离子体键上在等离子体清洁器的等离子体处理1分钟后25毫米×75毫米的显微镜载玻片的PDMS设备。 </li></ol></li><li> Ultrasonicate珠停牌60分钟。在超声浴中之前填充。吸管10微升悬浮微珠（300 nm的非功能化的二氧化硅是广告，或500纳米的二氧化硅羧基珠PAH-PSS层，或500与PSS层纳米二氧化硅胺珠）进入入口4和6的每个（参见图1的A，B）的PDMS芯片的等离子体接合到后，立即玻璃衬底。轻轻拍打PDMS芯片用枪头上提升珠包装。 <ol><li>填充珠的供货渠道后，覆盖除了1和9，用胶带所有的入口。空气干燥设备3小时并储存在+ 4℃下在使用前， 图2给出了胶体自组装过程的一个步骤的分步示意图。 </li></ol></li></ol> 3.试验研究DNA的浓度电动<ol><li>填充储层3,7用缓冲溶液（10微升1mM的PB）和储存器5用DNA样品（10微升在1mM的PB为10nM），并应用一个轻柔的负压与储2倒置枪头，8和10来填充用的溶液中的信道没有气泡（见<strong&gt;的图1B）。 </li><li>加10微升1mM的的PB到水库2和8和10μl10nM的DNA的储层10来平衡压力，并等待5分钟。以达到平衡。 </li><li>将铂针入储层3，5，7，10。 </li><li>横跨使用连接到源米和Pt线的分压器纳米流体结施加电压。先上水库5座，10和GND上水库3,7适用30 V。 </li><li>约30秒后，减少对水库10的电压25 V。 </li><li>使用机械快门，在每5秒一周期开口记录从DNA的荧光信号时，以减少样品的光漂白。 </li></ol>

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The authors have nothing to disclose.

继通用设备设计方案，研究纳米流体，我们用胶体纳米粒子的蒸发驱动的自组装，而不是光刻图案纳米通道阵列制造的两微流体通道之间的纳米流体连接处。当流动的胶体粒子进入珠输送通道，nanotraps的具有700nm的深度和2微米的小珠传送通道的两侧，在100微米的总宽度的宽度的阵列防止珠悬浮液流入缓冲液和样品通道由于在nanotraps的表面张力。一旦捕获，装在胎圈输送通道迅速胶体粒子和形成在?...

纳流控是μTAS的一个新兴的研究领域（微全分析系统）在10 1的长度尺度来研究生物过程或离子的迁移现象和分子- 10 2纳米。用的纳米流体的工具，如纳米通道的到来，分子和离子的输运过程可以以前所未有的精度进行监测和操纵，如果需要的话，通过利用只在该长度尺度对分离和检测是可用的功能。1,2之一这些特征纳米级特征是表面以在纳米通道散装电荷（或Dukhin数）的高比例，可能会导致电荷不平衡，并启动纳米通道和微通道之间的离子浓度极化（ICP）。3 对于纳米流体现象的研究一种常见的设备平台包括由纳米通道作为结的阵列连接的两个微通道系统。4-6 </sup&gt;用于构建这样的纳米流体装置的选择的材料是硅，因为它的高刚度，防止信道从期间接合工艺倒塌7然而，硅器件制造需要昂贵的掩模和在洁净室设备处理的大量。8- 10由于装置制造的，通过模制和等离子体结合，聚二甲基硅氧烷（PDMS）的便利性已被广泛接受的作为建筑材料为微流体，这将是对纳米流体的理想材料为好。然而，它的杨氏模量低周围360-870千帕，使得等离子体接合时与PDMS通道容易可折叠的。纳米通道（宽深）的最小长宽比必须小于10:1，这意味着通过标准光刻PDMS器件的制造会变得极具挑战性的，如果纳通道深度必须小于100纳米，需要一个信道宽度小于photolith的电流限制地理学在约1微米。为了克服这一限制，已经尝试来创建使用非光刻方法在PDMS纳通道如拉伸以引发裂纹等离子处理后的78纳米11或形成皱纹平均深度12塌陷允许用机械压力将PDMS通道一纳通道的高度低至60纳米。13 即使这些高度发明的非光刻方法允许低于100nm建筑纳通道中的深度，纳米通道制造的尺寸可控性仍对阻碍一个广泛接受的PDMS作为建筑材料为纳米流体装置。纳米通道的另一个关键问题，无论是在硅或PDMS，是在壳体的表面官能有必要改变对离子或分子的操纵通道壁的表面电荷。通过连接装置组装后，纳米通道是非常困难达到表面官能由于扩散限制运输。创建具有高尺寸精确度的和容易的表面官能纳米级信道，在微流体装置引起的蒸发14-16胶体粒子的自组装法可以是有前途的方法之一。除了 ​​孔尺寸和表面特性的可控性，甚至有可能以调谐使用涂有聚电解质的胶体粒子时在原位通过控制温度，17的pH值，18,19和离子强度的细孔的尺寸。18由于这些对于毛细管电，20生物传感器，21蛋白浓度22以及微流体蛋白质和DNA的分离。14,23在这项研究中的优势，胶体粒子的自组装方法已经找到的应用程序，我们部署这种自组装方法来构建在电动富集装置PDMS需要两个微通道之间的纳米流体结24的电动浓度背后的基本机制是基于离子浓度极化（ICP）。包括在以下方案25的制造和装配步骤的详细描述。

<table>
	<tbody>
		<tr>
			<td>Poly(Styrenesulfonic Acid) Sodium Salt</td>
			<td>Polysciences&#160;</td>
			<td>08772</td>
			<td></td>
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			<td>Sigma Aldrich</td>
			<td>479144-5G</td>
			<td></td>
		</tr>
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			<td>Silica Microsphere - 300 nm</td>
			<td>Polysciences&#160;</td>
			<td>24321</td>
			<td></td>
		</tr>
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			<td>Silica Microsphere - 500 nm</td>
			<td>Polysciences&#160;</td>
			<td>24323</td>
			<td></td>
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			<td>Silica Microsphere Carboxyl Functional - 500 nm</td>
			<td>Polysciences&#160;</td>
			<td>24753</td>
			<td></td>
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			<td>Polysciences&#160;</td>
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			<td>Sigma Aldrich</td>
			<td>175552</td>
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			<td>3510</td>
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			<td>10136-084</td>
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			<td>VM-10</td>
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			<td>Microcentrifuge</td>
			<td>VWR</td>
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			<td></td>
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			<td>Plasma Cleaner</td>
			<td>Harrick Plasma</td>
			<td>PDC-001-HP</td>
			<td></td>
		</tr>
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			<td>PDMS Mixer</td>
			<td>Thinky</td>
			<td>ARE-250</td>
			<td></td>
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			<td>Oven</td>
			<td>Thermo Scientific</td>
			<td>PR305220M</td>
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			<td>Epi-fluorescence Microscope</td>
			<td>Nikon</td>
			<td>Eclipse Ti</td>
			<td></td>
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			<td>CCD Camera</td>
			<td>Andor</td>
			<td>Clara</td>
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			<td>Alfa Aesar</td>
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			<td>Merck Millipore</td>
			<td>822184</td>
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			<td>Sodium chloride</td>
			<td>Fisher Scientific</td>
			<td>7646-14-5</td>
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			<td>Sigma Aldrich</td>
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</table>

creating sub-50 nm nanofluidic junctions in pdms microfluidic chip via self-assembly process of colloidal particles

聚二甲基硅氧烷（PDMS）是普遍的建筑材料，使微流体装置，因为它易于成型和粘合的以及它的透明度。由于PDMS材料的柔软性，但是，它是具有挑战性的使用PDMS用于构建纳米通道。渠道往往等离子体结合过程中容易崩溃。在本文中，我们提出了二氧化硅胶体纳米粒子的蒸发驱动的自组装方法与子50 2微之间50nm孔纳流控创建路口。孔尺寸以及表面电荷的纳米流体交界的是可调简单地由自组装过程之前，改变组装微流体装置的外胶体二氧化硅珠尺寸和表面官能在小瓶中。使用具有300纳米，500纳米，900纳米的珠粒度的纳米颗粒的自组装，有可能分别与〜45纳米的孔隙尺寸，〜75 nm和〜135毫微米，制作多孔膜。在电人的潜力，这种纳米膜发起离子浓差极化（ICP）作为阳离子选择性膜15分钟内集中精力靠〜1700倍的DNA。这种非光刻纳米制造工艺开辟了建立一个PDMS微流控芯片内的离子和分子纳米运输过程的研究可调谐纳米流体结了新的契机。

在PDMS一个电动集中器芯片包含两个微通道之间的自组装纳米流体结在图1A中示出）。在该装置的中部的通道是通过一个50微米的宽珠输送通道（ 图1B）填充有DNA样品溶液并通过在每侧的两个缓冲溶液的通道两侧。二氧化硅胶体悬浮液流入到珠输送通道等离子体接合后立即创建样品和缓冲液通道之间的纳米流体交界处。由700毫微米深和2微米宽的纳通...

Watch this Scientific Journal Video about Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles at JoVE.com

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

We propose a simple self-assembly technique of silica colloidal nanoparticles to create a nanofluidic junction between two microchannels in polydimethylsiloxane (PDMS). Using this technique, a nanoporous bead membrane with a pore size down to ~45 nm was built inside a microchannel and applied to electrokinetic preconcentration of DNA samples.

通过胶体粒子自组装过程创建在PDMS微流控芯片分50纳米的纳米流体结

Polydimethylsiloxane (PDMS) is the prevailing building material to make microfluidic devices due to its ease of molding and bonding as well as its ...

creating-sub-50-nm-nanofluidic-junctions-pdms-microfluidic-chip-via

Research

JoVE Journal

Engineering

10.6K 次观看.  New York University Abu Dhabi (NYUAD). We propose a simple self-assembly technique of silica colloidal nanoparticles to create a nanofluidic junction between two microchannels in polydimethylsiloxane (PDMS). Using this technique, a nanoporous bead membrane with a pore size down to ~45 nm was built inside a microchannel and applied to electrokinetic preconcentration of DNA samples.

视频: Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

How to Ignite an Atmospheric Pressure Microwave Plasma Torch without Any Additional Igniters

This movie shows how an atmospheric pressure plasma torch can be ignited by microwave power with no additional igniters. After ignition of the plasma, a stable and continuous operation of the plasma is possible and the plasma torch can be used for many different applications. On one hand, the hot (3,600 K gas temperature) plasma can be used for chemical processes and on the other hand the cold afterglow (temperatures down to almost RT) can be applied for surface processes. For example chemical syntheses are interesting volume processes. Here the microwave plasma torch can be used for the decomposition of waste gases which are harmful and contribute to the global warming but are needed as etching gases in growing industry sectors like the semiconductor branch. Another application is the dissociation of CO2. Surplus electrical energy from renewable energy sources can be used to dissociate CO2 to CO and O2. The CO can be further processed to gaseous or liquid higher hydrocarbons thereby providing chemical storage of the energy, synthetic fuels or platform chemicals for the chemical industry. Applications of the afterglow of the plasma torch are the treatment of surfaces to increase the adhesion of lacquer, glue or paint, and the sterilization or decontamination of different kind of surfaces. The movie will explain how to ignite the plasma solely by microwave power without any additional igniters, e.g., electric sparks. The microwave plasma torch is based on a combination of two resonators &#8212; a coaxial one which provides the ignition of the plasma and a cylindrical one which guarantees a continuous and stable operation of the plasma after ignition. The plasma can be operated in a long microwave transparent tube for volume processes or shaped by orifices for surface treatment purposes.

This movie shows how an atmospheric plasma torch can be ignited by microwaves with no additional igniters and provides a stable and continuous plasma operation suitable for plenty of applications.

如何点燃常压微波等离子体炬没有任何额外的点火器

This movie shows how an atmospheric pressure plasma torch can be ignited by microwave power with no additional igniters. After ignition of the plasma, a ...

科研

工程学

Thermal Measurement Techniques in Analytical Microfluidic Devices

Thermal measurement techniques have been used for many applications such as thermal characterization of materials and chemical reaction detection. Micromachining techniques allow reduction of the thermal mass of fabricated structures and introduce the possibility to perform high sensitivity thermal measurements in the micro-scale and nano-scale devices. Combining thermal measurement techniques with microfluidic devices allows performing different analytical measurements with low sample consumption and reduced measurement time by integrating the miniaturized system on a single chip. The procedures of thermal measurement techniques for particle detection, material characterization, and chemical detection are introduced in this paper.

Here, we present three protocols for thermal measurements in microfluidic devices.

在分析微流体装置的热测量技术

Thermal measurement techniques have been used for many applications such as thermal characterization of materials and chemical reaction detection. ...

Development of an Experimental Setup for the Measurement of the Coefficient of Restitution under Vacuum Conditions

The Discrete Element Method is used for the simulation of particulate systems to describe and analyze them, to predict and afterwards optimize their behavior for single stages of a process or even an entire process. For the simulation with occurring particle-particle and particle-wall contacts, the value of the coefficient of restitution is required. It can be determined experimentally. The coefficient of restitution depends on several parameters like the impact velocity. Especially for fine particles the impact velocity depends on the air pressure and under atmospheric pressure high impact velocities cannot be reached. For this, a new experimental setup for free-fall tests under vacuum conditions is developed. The coefficient of restitution is determined with the impact and rebound velocity which are detected by a high-speed camera. To not hinder the view, the vacuum chamber is made of glass. Also a new release mechanism to drop one single particle under vacuum conditions is constructed. Due to that, all properties of the particle can be characterized beforehand.

The coefficient of restitution is a parameter that describes the loss of kinetic energy during collision. Here, a free-fall setup under vacuum conditions is developed to be able to determine the coefficient of restitution parameter for particles in micrometer range with high impact velocities.

实验装置的研制归还系数在真空条件下测量

The Discrete Element Method is used for the simulation of particulate systems to describe and analyze them, to predict and afterwards optimize their ...

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

We present a method for colloidal synthesis of silver nanocubes and the use of these in combination with a smooth gold film, to fabricate plasmonic nanoscale patch antennas. This includes a detailed procedure for the fabrication of thin films with a well-controlled thickness over macroscopic areas using layer-by-layer deposition of polyelectrolyte polymers, namely poly(allylamine) hydrochloride (PAH) and polystyrene sulfonate (PSS). These polyelectrolyte spacer layers serve as a dielectric gap in between silver nanocubes and a gold film. By controlling the size of the nanocubes or the gap thickness, the plasmon resonance can be tuned from about 500 nm to 700 nm. Next, we demonstrate how to incorporate organic sulfo-cyanine5 carboxylic acid (Cy5) dye molecules into the dielectric polymer gap region of the nanopatch antennas. Finally, we show greatly enhanced fluorescence of the Cy5 dyes by spectrally matching the plasmon resonance with the excitation energy and the Cy5 absorption peak. The method presented here enables the fabrication of plasmonic nanopatch antennas with well-controlled dimensions utilizing colloidal synthesis and a layer-by-layer dip-coating process with the potential for low cost and large-scale production. These nanopatch antennas hold great promise for practical applications, for example in sensing, ultrafast optoelectronic devices and for high-efficiency photodetectors.

A protocol for the colloidal synthesis of silver nanocubes and fabrication of plasmonic nanoscale patch antennas with sub-10 nm gaps is presented.

在等离子体激元和纳米光子学应用Nanopatch天线的合成胶体

We present a method for colloidal synthesis of silver nanocubes and the use of these in combination with a smooth gold film, to fabricate plasmonic ...

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5

We present a high-temperature and high-pressure gas adsorption measurement device based on a high-frequency oscillating microbalance (5 MHz langatate crystal microbalance, LCM) and its use for gas adsorption measurements in zeolite H-ZSM-5. Prior to the adsorption measurements, zeolite H-ZSM-5 crystals were synthesized on the gold electrode in the center of the LCM, without covering the connection points of the gold electrodes to the oscillator, by the steam-assisted crystallization (SAC) method, so that the zeolite crystals remain attached to the oscillating microbalance while keeping good electroconductivity of the LCM during the adsorption measurements. Compared to a conventional quartz crystal microbalance (QCM) which is limited to temperatures below 80 &#176;C, the LCM can realize the adsorption measurements in principle at temperatures as high as 200-300 &#176;C (i.e., at or close to the reaction temperature of the target application of one-stage DME synthesis from the synthesis gas), owing to the absence of crystalline-phase transitions up to its melting point (1,470 &#176;C). The system was applied to investigate the adsorption of CO2, H2O, methanol and dimethyl ether (DME), each in the gas phase, on zeolite H-ZSM-5 in the temperature and pressure range of 50-150 &#176;C and 0-18 bar, respectively. The results showed that the adsorption isotherms of these gases in H-ZSM-5 can be well fitted by Langmuir-type adsorption isotherms. Furthermore, the determined adsorption parameters, i.e., adsorption capacities, adsorption enthalpies, and adsorption entropies, compare well to literature data. In this work, the results for CO2 are shown as an example.

A protocol for high-temperature and high-pressure gas adsorption measurements on zeolite H-ZSM-5 using an adsorption measurement device based on a langatate crystal microbalance is presented. Prior to the adsorption measurements, the synthesis of zeolite H-ZSM-5 on the langatate crystal microbalance sensor by the steam-assisted crystallization (SAC) method is demonstrated.

基于一个Langatate体微天平的高温高压气体吸附在分子筛吸附器H-ZSM-5

We present a high-temperature and high-pressure gas adsorption measurement device based on a high-frequency oscillating microbalance (5 MHz langatate ...

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity

A method for investigating recombination dynamics of photo-induced charge carriers in thin film semiconductors, specifically in photovoltaic materials such as organo-lead halide perovskites is presented. The perovskite film thickness and absorption coefficient are initially characterized by profilometry and UV-VIS absorption spectroscopy. Calibration of both laser power and cavity sensitivity is described in detail. A protocol for performing Flash-photolysis Time Resolved Microwave Conductivity (TRMC) experiments, a non-contact method of determining the conductivity of a material, is presented. A process for identifying the real and imaginary components of the complex conductivity by performing TRMC as a function of microwave frequency is given. Charge carrier dynamics are determined under different excitation regimes (including both power and wavelength). Techniques for distinguishing between direct and trap-mediated decay processes are presented and discussed. Results are modelled and interpreted with reference to a general kinetic model of photoinduced charge carriers in a semiconductor. The techniques described are applicable to a wide range of optoelectronic materials, including organic and inorganic photovoltaic materials, nanoparticles, and conducting/semiconducting thin films.

A Time Resolved Microwave Conductivity technique for investigating direct and trap-mediated recombination dynamics and determining carrier mobilities of thin film semiconductors is presented here.

通过时间分辨微波电导率重组动力学薄膜光伏材料

A method for investigating recombination dynamics of photo-induced charge carriers in thin film semiconductors, specifically in photovoltaic materials ...

Challenges in Rheological Characterization of Highly Concentrated Suspensions &#8212; A Case Study for Screen-printing Silver Pastes

A comprehensive rheological characterization of highly concentrated suspensions or pastes is mandatory for a targeted product development meeting the manifold requirements during processing and application of such complex fluids. In this investigation, measuring protocols for a conclusive assessment of different process relevant rheological parameters have been evaluated. This includes the determination of yield stress, viscosity, wall slip velocity, structural recovery after large deformation and elongation at break as well as tensile force during filament stretching.
The importance of concomitant video recordings during parallel-plate rotational rheometry for a significant determination of rheological quantities is demonstrated. The deformation profile and flow field at the sample edge can be determined using appropriate markers. Thus, measurement parameter settings and plate roughness values can be identified for which yield stress and viscosity measurements are possible. Slip velocity can be measured directly and measuring conditions at which plug flow, shear banding or sample spillover occur can be identified clearly. 
Video recordings further confirm that the change in shear moduli observed during three stage oscillatory shear tests with small deformation amplitude in stage I and III but large oscillation amplitude in stage II can be directly attributed to structural break down and recovery. For the pastes investigated here, the degree of irreversible, shear-induced structural change increases with increasing deformation amplitude in stage II until a saturation is reached at deformations corresponding to the crossover of G' and G'', but the irreversible damage is independent of the duration of large amplitude shear. 
A capillary breakup elongational rheometer and a tensile tester have been used to characterize deformation and breakup behavior of highly filled pastes in uniaxial elongation. Significant differences were observed in all experiments described above for two commercial screen-printing silver pastes used for front side metallization of Si-solar cells.

A protocol for a robust and application relevant rheological characterization of highly concentrated suspensions is presented. Silver pastes used for screen-printing application in solar cell production are employed as model systems.

挑战流变特性高度集中悬架 - 为例进行丝网印刷银浆

A comprehensive rheological characterization of highly concentrated suspensions or pastes is mandatory for a targeted product development meeting the ...

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 ...

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture

The mechanical strength of extruded catalysts and their natural or forced breakage by either collision against a surface or by a compressive load in a fixed bed are important phenomena in catalyst technology. The mechanical strength of the catalyst is measured here by its bending strength or flexural strength. This technique is relatively new from the perspective of applying it to commercial catalysts of typical sizes used in the industry. Catalyst breakage by collision against a surface is measured after a fall of the extrudates through the ambient air in a vertical pipe. Quantifying the impact force is done theoretically by applying Newton's second law. Measurement of catalyst breakage due to stress in a fixed bed is done following the standard procedure of the bulk crush strength test. Novel here is the focus on measuring the reduction in the length to diameter ratio of the extrudates as a function of the stress.

Here we present a protocol to measure the modulus of rupture of an extruded catalyst and the breakage of said catalyst extrudates by collision against a surface or by compression in a fixed bed.

基于断裂模量的催化剂挤出断裂预测

The mechanical strength of extruded catalysts and their natural or forced breakage by either collision against a surface or by a compressive load in a ...

Generation of Size-controlled Poly (ethylene Glycol) Diacrylate Droplets via Semi-3-Dimensional Flow Focusing Microfluidic Devices

Uniform and size-controllable poly (ethylene glycol) diacrylate (PEGDA) droplets could be produced via the flow focusing process in a microfluidic device. This paper proposes a semi-three-dimensional (semi-3D) flow-focusing microfluidic chip for droplet formation. The polydimethylsiloxane (PDMS) chip was fabricated using the multi-layer soft lithography method. Hexadecane containing surfactant was used as the continuous phase, and PEGDA with the ultraviolet (UV) photo-initiator was the dispersed phase. Surfactants allowed the local surface tension to drop and formed a more cusped tip which promoted breaking into tiny micro-droplets. As the pressure of dispersed phase was constant, the size of droplets became smaller with increasing continuous phase pressure before dispersed phase flow was broken off. As a result, droplets with size variation from 1 &#181;m to 80 &#181;m in diameter could be selectively achieved by changing the pressure ratio in two inlet channels, and the average coefficient of variation was estimated to be below 7%. Furthermore, droplets could turn into micro-beads by UV exposure for photo-polymerization. Conjugating biomolecules on such micro-beads surface have many potential applications in the fields of biology and chemistry.

Generation of Size-controlled Poly ethylene Glycol Diacrylate Droplets via Semi-3-Dimensional Flow Focusing Microfluidic Devices

Here, we present a protocol to illustrate the fabrication processes and verifying experiments of a semi-three-dimensional (semi-3D) flow-focusing microfluidic chip for droplet formation.

Semi-3-Dimensional 流聚焦微流控装置产生尺寸控制的聚乙二醇二丙烯酸酯液滴

Uniform and size-controllable poly (ethylene glycol) diacrylate (PEGDA) droplets could be produced via the flow focusing process in a microfluidic device. ...