وأيد هذا البحث من قبل برنامج Nanomanufacturing من المؤسسة الوطنية للعلوم (CMMI-0927634). وأيد دافور Copic في جزء من برنامج زمالة راكهام الاستحقاق في جامعة ميشيغان. سامح توفيق يقر دعم جزئي من زمالة راكهام Predoctoral. وقد أيد مايكل دي Volder من الصندوق البلجيكي للأبحاث العلمية - فلاندرز (FWO). تم تنفيذ Microfabrication في مرفق Nanofabrication لوري (LNF)، الذي هو عضو في شبكة تقنية النانو البنية التحتية الوطنية، وأنجز المجهر الإلكتروني في الكترون ميشيغان مختبر التحليل Microbeam (إيمال).

<ol>
	<li>Xia, Y. N., Whitesides, G. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Soft+lithography.">Soft lithography.</a> Annual Review of Materials Science. 28, 153-184 (1998).</li><li>Xia, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Replica+molding+using+polymeric+materials:+A+practical+step+toward+nanomanufacturing.">Replica molding using polymeric materials: A practical step toward nanomanufacturing.</a> Advanced Materials. 9, 147-149 (1997).</li><li>Tasis, D., Tagmatarchis, N., Bianco, A., Prato, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chemistry+of+Carbon+Nanotubes.">Chemistry of Carbon Nanotubes.</a> Chemical Reviews. 106, 1105-1136 (2006).</li><li>De Volder, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Diverse+3D+Microarchitectures+Made+by+Capillary+Forming+of+Carbon+Nanotubes.">Diverse 3D Microarchitectures Made by Capillary Forming of Carbon Nanotubes.</a> Advanced Materials. 22, 4384-4389 (2010).</li><li>Copic, D., Park, S. J., Tawfick, S., De Volder, M. F. L., Hart, A. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fabrication+of+high-aspect-ratio+polymer+microstructures+and+hierarchical+textures+using+carbon+nanotube+composite+master+molds.">Fabrication of high-aspect-ratio polymer microstructures and hierarchical textures using carbon nanotube composite master molds.</a> Lab on a Chip. 11, 1831-1837 (2011).</li><li>De Volder, M. F. L., Park, S. J., Tawfick, S. H., Vidaud, D. O., Hart, A. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fabrication+and+electrical+integration+of+robust+carbon+nanotube+micropillars+by+self-directed+elastocapillary+densification.">Fabrication and electrical integration of robust carbon nanotube micropillars by self-directed elastocapillary densification.</a> Journal of Micromechanics and Microengineering. 21, 045033-04 (2011).</li><li>Zhao, Z. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Bending+of+nanoscale+filament+assemblies+by+elastocapillary+densification.">Bending of nanoscale filament assemblies by elastocapillary densification.</a> Physical Review E. 82, 041605 (2010).</li><li>De Volder, M. F. L., Vidaud, D. O., Meshot, E. R., Tawfick, S., Hart, A. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Self-similar+organization+of+arrays+of+individual+carbon+nanotubes+and+carbon+nanotube+micropillars.">Self-similar organization of arrays of individual carbon nanotubes and carbon nanotube micropillars.</a> Microelectronic Engineering. 87, 1233-1238 (2010).</li><li>Nessim, G. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tuning+of+Vertically-Aligned+Carbon+Nanotube+Diameter+and+Areal+Density+through+Catalyst+Pre-Treatment.">Tuning of Vertically-Aligned Carbon Nanotube Diameter and Areal Density through Catalyst Pre-Treatment.</a> Nano Letters. 8, 3587-3593 (2008).</li><li>Pokroy, B., Epstein, A. K., Persson-Gulda, M. C. M., Aizenberg, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fabrication+of+Bioinspired+Actuated+Nanostructures+with+Arbitrary+Geometry+and+Stiffness.">Fabrication of Bioinspired Actuated Nanostructures with Arbitrary Geometry and Stiffness.</a> Advanced Materials. 21, 463-469 (2009).</li></ol>

الإعلان عن أي تضارب في المصالح.

الزخرفة الحجرية والتحضير للركائز حافزا المركز الوطني للاستشعار واضحة وقابلة للتكرار، ومع ذلك، وتحقيق نمو متسق المركز الوطني للاستشعار يتطلب اهتماما دقيقا لكيفية تأثر ارتفاع وكثافة الغابات من قبل المركز الوطني للاستشعار نسبة الرطوبة المحيطة وحالة نمو الأنبوب. في ?...

<table border="1" style=";text-align:right;direction:rtl"><tbody><tr><td> اسم كاشف </td><td> شركة </td><td> فهرس العدد </td><td> تعليقات </td></tr><tr><td> 4 &quot;قطرها &lt;100&gt; رقائق السليكون مغلفة شافي 2 (300 نانومتر) </td><td> السيليكون كويست </td><td> عرف </td><td></td></tr><tr><td> إيجابي مقاومة للضوء </td><td> MicroChem </td><td> SPR 220-3،0 </td><td></td></tr><tr><td> Hexamethyldisilizane (HMDS) </td><td> MicroChem </td><td></td><td></td></tr><tr><td> المطور </td><td> من الألف إلى الياء المواد الإلكترونية كورب الولايات المتحدة الأمريكية </td><td> من الألف إلى الياء 300 MIF </td><td></td></tr><tr><td> نظام الاخرق </td><td> كورت J. Lesker </td><td> مختبر 18 </td><td> الاخرق نظام لترسيب محفز </td></tr><tr><td> الحرارية فيشر Minimite </td><td&gt; فيشر العلمية </td><td> TF55030A </td><td> الفرن أنبوب للنمو المركز الوطني للاستشعار </td></tr><tr><td> الكوارتز الانبوب </td><td> منتجات الزجاج التقني </td><td> عرف </td><td> 22 الوصف رقم مم × 25 مم OD 30 &quot;طول </td></tr><tr><td> الهيليوم غاز </td><td> PurityPlus </td><td> انه (PrePurified 300) </td><td></td></tr><tr><td> غاز الهيدروجين </td><td> PurityPlus </td><td> H 2 (PrePurified 300) </td><td> UHP </td></tr><tr><td> الاثيلين الغاز </td><td> PurityPlus </td><td> C 2 H 4 (PrePurified 300) </td><td> UHP </td></tr><tr><td> مثقب ورقة الألومنيوم </td><td> ماكماستر، كار </td><td> 9232T221 </td><td> لعقد العينة أعلاه الدورق التكثيف </td></tr><tr><td> الأشعة فوق البنفسجية من الفيضانات مصباح </td><td> Dymax </td><td> نموذج 2000 </td><td></td></tr><tr><td> SU-8 2002 </td><td> MicroChem </td><td> SU-8 2002 </td><td></td></tr><tr><td> Polydimethylsiloxane (PDMS) </td><td> داو كورنينج </td><td> Sylgard إلاستومر سيليكون 184 كيت </td><td></td></tr></tbody></table>

fabrication, densification, and replica molding of 3d carbon nanotube microstructures

إدخال مواد وعمليات جديدة لmicrofabrication و، في جزء كبير منه، مكنت التطورات كثيرة ومهمة في مايكروسيستمز، وأجهزة المختبر على واحد في رقاقة، وتطبيقاتها. على وجه الخصوص، تم تحويل القدرات من أجل فعالية من حيث التكلفة تصنيع المجهرية البوليمر من قبل ظهور الطباعة الحجرية الناعمة وتقنيات أخرى micromolding 1، 2، وهذا أدى إلى ثورة في تطبيقات microfabrication إلى الهندسة الطبية الحيوية وعلم الأحياء. ومع ذلك، فإنه لا يزال يشكل تحديا لافتعال المجهرية مع محددة جيدا القوام سطح النانومترية الحجم، والى افتعال اشكال 3D التعسفي على النطاق الصغير. متانة القوالب الرئيسية والحفاظ على سلامة شكل مهم بشكل خاص لتحقيق عالية الدقة من تكرار الهياكل المعقدة والحفاظ على نسيج من سطح النانو. مزيج من القوام الهرمي، والأشكال غير متجانسة، يمثل تحديا ضخما لأساليب microfabrication القائمة التي لارالاعتماد على gely من أعلى إلى أسفل الحفر باستخدام قوالب قناع ثابت. من ناحية أخرى، يمكن توليف من أسفل إلى أعلى من النانو مثل الأنابيب النانوية والأسلاك النانوية تقدم قدرات جديدة لmicrofabrication، ولا سيما من خلال الاستفادة من التنظيم الذاتي الجماعي النانو، والسيطرة المحلية على سلوك نموها فيما يتعلق بأنماط microfabricated . هدفنا هو أن نقدم أنابيب الكربون النانوية الانحياز عموديا (تشارك المركز الوطني)، والتي نشير إليها باسم &quot;الغابات&quot; المركز الوطني للاستشعار، كمادة microfabrication جديد. نقدم تفاصيل عن مجموعة من الطرق ذات الصلة وضعت مؤخرا من قبل مجموعة لدينا: تلفيق المجهرية الغابات المركز الوطني للاستشعار عن الأمراض القلبية الوعائية الحرارية من الأفلام حافزا منقوشة lithographically رقيقة؛ الذاتي الموجهة التكثيف elastocapillary المجهرية من المركز الوطني للاستشعار، وصب طبق الأصل من البوليمر المجهرية باستخدام قوالب المركز الوطني للاستشعار سيد مركب . على وجه الخصوص، عملنا يدل على ان تكثيف التوجيه الذاتي الشعرية (&quot;تشكيل الشعرية&quot;)، والذي هو performed بواسطة التكثيف من مذيب على الركيزة مع المركز الوطني للاستشعار المجهرية، ويزيد بشكل كبير من كثافة التعبئة والتغليف من تشارك المركز الوطني. هذه العملية يمكن تحويل موجهة من المركز الوطني للاستشعار المجهرية عمودي في الأشكال على التوالي، وميلا، والملتوية، والتي لها خصائص ميكانيكية قوية تتجاوز تلك التي من البوليمرات microfabrication نموذجي. وهذا بدوره يتيح تشكيل قوالب بمركب متناهي في الصغر من قبل المركز الوطني للاستشعار سيد الشعرية يحركها تسلل من البوليمرات. الهياكل طبق الاصل يحمل نسيج متباين الخواص النانو لتشارك المركز الوطني الانحياز، ويمكن أن يكون مع الجدران الفرعية ميكرون سمك ونسب تتجاوز 50:1. التكامل من المركز الوطني للاستشعار المجهرية في تلفيق يتيح فرصا أكبر للاستفادة من الخصائص الكهربائية والحرارية من تشارك المركز الوطني، وقدرات متنوعة للصناعات الكيماوية وfunctionalization البيوكيميائية 3.

Watch this Scientific Journal Video about Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures at JoVE.com

Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures

نقدم أساليب لتصنيع المجهرية منقوشة من أنابيب الكربون النانوية الانحياز عموديا (تشارك المركز الوطني)، واستخدامها على النحو قوالب رئيسية لانتاج المجهرية البوليمر مع المنظمة نسيج السطح النانو. وdensified الغابات المركز الوطني للاستشعار عن طريق التكثيف من المذيب على الركيزة، مما يزيد بشكل كبير من كثافة التعبئة والتغليف وتمكن ذاتيين تشكيل الأشكال 3D.

تلفيق، التكثيف، وطبق الأصل من صب 3D المجهرية الأنابيب الجزيئية الكربونية

The introduction of new materials and processes to microfabrication has, in large part, enabled many important advances in microsystems, lab-on-a-chip ...

fabrication-densification-replica-molding-3d-carbon-nanotube

Research

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Engineering

20.0K Views.  University of Michigan. نقدم أساليب لتصنيع المجهرية منقوشة من أنابيب الكربون النانوية الانحياز عموديا (تشارك المركز الوطني)، واستخدامها على النحو قوالب رئيسية لانتاج المجهرية البوليمر مع المنظمة نسيج السطح النانو. وdensified الغابات المركز الوطني للاستشعار عن طريق التكثيف من المذيب على ...

Video: Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures

Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays

In this article, we describe a simple method to reversibly tune the wetting properties of vertically aligned carbon nanotube (CNT) arrays. Here, CNT arrays are defined as densely packed multi-walled carbon nanotubes oriented perpendicular to the growth substrate as a result of a growth process by the standard thermal chemical vapor deposition (CVD) technique.1,2 These CNT arrays are then exposed to vacuum annealing treatment to make them more hydrophobic or to dry oxidation treatment to render them more hydrophilic. The hydrophobic CNT arrays can be turned hydrophilic by exposing them to dry oxidation treatment, while the hydrophilic CNT arrays can be turned hydrophobic by exposing them to vacuum annealing treatment. Using a combination of both treatments, CNT arrays can be repeatedly switched between hydrophilic and hydrophobic.2 Therefore, such combination show a very high potential in many industrial and consumer applications, including drug delivery system and high power density supercapacitors.3-5
The key to vary the wettability of CNT arrays is to control the surface concentration of oxygen adsorbates. Basically oxygen adsorbates can be introduced by exposing the CNT arrays to any oxidation treatment. Here we use dry oxidation treatments, such as oxygen plasma and UV/ozone, to functionalize the surface of CNT with oxygenated functional groups. These oxygenated functional groups allow hydrogen bond between the surface of CNT and water molecules to form, rendering the CNT hydrophilic. To turn them hydrophobic, adsorbed oxygen must be removed from the surface of CNT. Here we employ vacuum annealing treatment to induce oxygen desorption process. CNT arrays with extremely low surface concentration of oxygen adsorbates exhibit a superhydrophobic behavior.

This article describes a simple method to fabricate vertically aligned carbon nanotube arrays by CVD and to subsequently tune their wetting properties by exposing them to vacuum annealing or dry oxidation treatment.

الجاف للملابس الأكسدة وفراغ التليين العلاجات للموالفة على خصائص ترطيب من صفائف الأنابيب الجزيئية الكربون

In this article, we describe a simple method to reversibly  tune the wetting properties of vertically aligned carbon nanotube (CNT) arrays.  Here, CNT ...

Synthesis and Functionalization of Nitrogen-doped Carbon Nanotube Cups with Gold Nanoparticles as Cork Stoppers

Nitrogen-doped carbon nanotubes consist of many cup-shaped graphitic compartments termed as nitrogen-doped carbon nanotube cups (NCNCs). These as-synthesized graphitic nanocups from chemical vapor deposition (CVD) method were stacked in a head-to-tail fashion held only through noncovalent interactions. Individual NCNCs can be isolated out of their stacking structure through a series of chemical and physical separation processes. First, as-synthesized NCNCs were oxidized in a mixture of strong acids to introduce oxygen-containing defects on the graphitic walls. The oxidized NCNCs were then processed using high-intensity probe-tip sonication which effectively separated the stacked NCNCs into individual graphitic nanocups. Owing to their abundant oxygen and nitrogen surface functionalities, the resulted individual NCNCs are highly hydrophilic and can be effectively functionalized with gold nanoparticles (GNPs), which preferentially fit in the opening of the cups as cork stoppers. These graphitic nanocups corked with GNPs may find promising applications as nanoscale containers and drug carriers.

We discussed the synthesis of individual graphitic nanocups using a series of techniques including chemical vapor deposition, acid oxidation and probe-tip sonication. By citrate reduction of HAuCl4, the graphitic nanocups were effectively corked with gold nanoparticles due to the chemically reactive edges of the cups.

التوليف وFunctionalization من النيتروجين مخدر الكؤوس الأنابيب الجزيئية الكربونية مع جزيئات الذهب كما سدادات الفلين

Nitrogen-doped carbon  nanotubes consist of many cup-shaped graphitic compartments termed as  nitrogen-doped carbon nanotube cups (NCNCs).  These ...

Process of Making Three-dimensional Microstructures using Vaporization of a Sacrificial Component

Vascular structures in natural systems are able to provide high mass transport through high surface areas and optimized structure. Few synthetic material fabrication techniques are able to mimic the complexity of these structures while maintaining scalability. The Vaporization of a Sacrificial Component (VaSC) process is able to do so. This process uses sacrificial fibers as a template to form hollow, cylindrical microchannels embedded within a matrix. Tin (II) oxalate (SnOx) is embedded within poly(lactic) acid (PLA) fibers which facilitates the use of this process. The SnOx catalyzes the depolymerization of the PLA fibers at lower temperatures. The lactic acid monomers are gaseous at these temperatures and can be removed from the embedded matrix at temperatures that do not damage the matrix. Here we show a method for aligning these fibers using micromachined plates and a tensioning device to create complex patterns of three-dimensionally arrayed microchannels. The process allows the exploration of virtually any arrangement of fiber topologies and structures.

The Vaporization of a Sacrificial Component (VaSC) process is used to fabricate microvascular structures. This procedure uses sacrificial poly(lactic) acid fibers to form hollow microchannels with precise 3D geometric positioning provided by laser micromachined guide plates.

عملية صنع المجهرية ثلاثي الأبعاد باستخدام تبخير مكون قرباني

Vascular structures in natural systems are able to provide high mass transport through high surface areas and optimized structure. Few synthetic material ...

Fabrication and Testing of Microfluidic Optomechanical Oscillators

Cavity optomechanics experiments that parametrically couple the phonon modes and photon modes have been investigated in various optical systems including microresonators. However, because of the increased acoustic radiative losses during direct liquid immersion of optomechanical devices, almost all published optomechanical experiments have been performed in solid phase. This paper discusses a recently introduced hollow microfluidic optomechanical resonator. Detailed methodology is provided to fabricate these ultra-high-Q microfluidic resonators, perform optomechanical testing, and measure radiation pressure-driven breathing mode and SBS-driven whispering gallery mode parametric vibrations. By confining liquids inside the capillary resonator, high mechanical- and optical- quality factors are simultaneously maintained.

Parametric optomechanical excitations have recently been experimentally demonstrated in microfluidic optomechanical resonators by means of optical radiation pressure and stimulated Brillouin scattering. This paper describes the fabrication of these microfluidic resonators along with methodologies for generating and verifying optomechanical oscillations.

تصنيع واختبار ميكروفلويديك الميكانيكية المذبذبات

Cavity optomechanics experiments that parametrically couple the phonon modes and photon modes have been investigated in various optical systems including ...

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

A method of fabricating organic photovoltaic (OPV) tandems that requires no vacuum processing is presented. These devices are comprised of two solution-processed polymeric cells connected in parallel by a transparent carbon nanotubes (CNT) interlayer. This structure includes improvements in fabrication techniques for tandem OPV devices. First the need for ambient-processed cathodes is considered. The CNT anode in the tandem device is tuned via ionic gating to become a common cathode. Ionic gating employs electric double layer charging to lower the work function of the CNT electrode. Secondly, the difficulty of sequentially stacking tandem layers by solution-processing is addressed. The devices are fabricated via solution and dry-lamination in ambient conditions with parallel processing steps. The method of fabricating the individual polymeric cells, the steps needed to laminate them together with a common CNT cathode, and then provide some representative results are described. These results demonstrate ionic gating of the CNT electrode to create a common cathode and addition of current and efficiency as a result of the lamination procedure.

A method of fabricating, in ambient conditions, organic photovoltaic tandem devices in a parallel configuration is presented. These devices feature an air-processed, semi-transparent, carbon nanotube common cathode.

الطريقة المحيطة لإنتاج وIonically عن طريق بوابة الأنابيب الجزيئية الكربونية القطب السالب المشترك جنبا الى جنب في خلايا الشمسية العضوية

A method of fabricating organic photovoltaic (OPV) tandems that requires no vacuum processing is presented. These devices are comprised of two ...

Fabrication of Low Temperature Carbon Nanotube Vertical Interconnects Compatible with Semiconductor Technology

We demonstrate a method for the low temperature growth (350 &#176;C) of vertically-aligned carbon nanotubes (CNT) bundles on electrically conductive thin-films. Due to the low growth temperature, the process allows integration with modern low-&#954; dielectrics and some flexible substrates. The process is compatible with standard semiconductor fabrication, and a method for the fabrication of electrical 4-point probe test structures for vertical interconnect test structures is presented. Using scanning electron microscopy the morphology of the CNT bundles is investigated, which demonstrates vertical alignment of the CNT and can be used to tune the CNT growth time. With Raman spectroscopy the crystallinity of the CNT is investigated. It was found that the CNT have many defects, due to the low growth temperature. The electrical current-voltage measurements of the test vertical interconnects displays a linear response, indicating good ohmic contact was achieved between the CNT bundle and the top and bottom metal electrodes. The obtained resistivities of the CNT bundle are among the average values in the literature, while a record-low CNT growth temperature was used.

A method for the growth of low temperature vertically-aligned carbon nanotubes, and the subsequent fabrication of vertical interconnect electrical test structures using semiconductor fabrication is presented.

تلفيق درجة الحرارة منخفضة الكربون الأنابيب الجزيئية عمودي روابط متوافق مع تكنولوجيا أشباه الموصلات

We demonstrate a method for the low temperature growth (350 &#176;C) of vertically-aligned carbon nanotubes (CNT) bundles on electrically conductive ...

Fabrication and Characterization of Superconducting Resonators

Superconducting microwave resonators are of interest for a wide range of applications, including for their use as microwave kinetic inductance detectors (MKIDs) for the detection of faint astrophysical signatures, as well as for quantum computing applications and materials characterization. In this paper, procedures are presented for the fabrication and characterization of thin-film superconducting microwave resonators. The fabrication methodology allows for the realization of superconducting transmission-line resonators with features on both sides of an atomically smooth single-crystal silicon dielectric. This work describes the procedure for the installation of resonator devices into a cryogenic microwave testbed and for cool-down below the superconducting transition temperature. The set-up of the cryogenic microwave testbed allows one to do careful measurements of the complex microwave transmission of these resonator devices, enabling the extraction of the properties of the superconducting lines and dielectric substrate (e.g., internal quality factors, loss and kinetic inductance fractions), which are important for device design and performance.

Superconducting microwave resonators are of interest for detection of light, quantum computing applications and materials characterization. This work presents a detailed procedure for fabrication and characterization of superconducting microwave resonator scattering parameters.

تصنيع وتوصيف الموصلية الرنين

Superconducting microwave resonators are of interest for a wide range of applications, including for their use as microwave kinetic inductance detectors ...

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

The aim of this work is to present a zero-waste process for storing CO2 in a stable and benign mineral form while producing zeolitic minerals with sufficient heavy metal adsorption capacity. To this end, blast furnace slag, a residue from iron-making, is utilized as the starting material. Calcium is selectively extracted from the slag by leaching with acetic acid (2 M CH3COOH) as the extraction agent. The filtered leachate is subsequently physico-chemically purified and then carbonated to form precipitated calcium carbonate (PCC) of high purity (&lt;2 wt% non-calcium impurities, according to ICP-MS analysis). Sodium hydroxide is added to neutralize the regenerated acetate. The morphological properties of the resulting calcitic PCC are tuned for its potential application as a filler in papermaking. In parallel, the residual solids from the extraction stage are subjected to hydrothermal conversion in a caustic solution (2 M NaOH) that leads to the predominant formation of a particular zeolitic mineral phase (detected by XRD), namely analcime (NaAlSi2O6&#8729;H2O). Based on its ability to adsorb Ni2+, as reported from batch adsorption experiments and ICP-OES analysis, this product can potentially be used in wastewater treatment or for environmental remediation applications.

A protocol for the parallel production of precipitated calcium carbonate and zeolitic material from blast furnace slag via mineral carbonation and alkaline hydrothermal conversion, respectively, is presented. The performance of the zeolitic material towards nickel adsorption is tested.

في اتجاهين تثمين انفجار فرن الخبث: توليف معجل كربونات الكالسيوم والأنظف الزيوليت المعادن الثقيلة الممتزات

The aim of this work is to present a zero-waste process for storing CO2 in a stable and benign mineral form while producing zeolitic minerals with ...

Precision Milling of Carbon Nanotube Forests Using Low Pressure Scanning Electron Microscopy

A nanoscale fabrication technique appropriate for milling carbon nanotube (CNT) forests is described. The technique utilizes an environmental scanning electron microscope (ESEM) operating with a low pressure water vapor ambient. In this technique, a portion of the electron beam interacts with the water vapor in the vicinity of the CNT sample, dissociating the water molecules into hydroxyl radicals and other species by radiolysis. The remainder of the electron beam interacts with the CNT forest sample, making it susceptible to oxidation from the chemical products of radiolysis. This technique may be used to trim a selected region of an individual CNT, or it may be used to remove hundreds of cubic microns of material by adjusting ESEM parameters. The machining resolution is similar to the imaging resolution of the ESEM itself. The technique produces only small quantities of carbon residue along the boundaries of the cutting zone, with minimal effect on the native structural morphology of the CNT forest.

Low pressure scanning electron microscopy in a water vapor ambient is used to machine nanoscale to microscale features in carbon nanotube forests.

الدقة طحن الأنابيب الجزيئية الكربونية الغابات عن طريق انخفاض الضغط الضوئي المجهر الإلكتروني

A nanoscale fabrication technique appropriate for milling carbon nanotube (CNT) forests is described. The technique utilizes an environmental scanning ...

High Temperature Fabrication of Nanostructured Yttria-Stabilized-Zirconia (YSZ) Scaffolds by In Situ Carbon Templating Xerogels

We demonstrate a method for the high temperature fabrication of porous, nanostructured yttria-stabilized-zirconia (YSZ, 8 mol% yttria - 92 mol% zirconia) scaffolds with tunable specific surface areas up to 80 m2&#183;g-1. An aqueous solution of a zirconium salt, yttrium salt, and glucose is mixed with propylene oxide (PO) to form a gel. The gel is dried under ambient conditions to form a xerogel. The xerogel is pressed into pellets and then sintered in an argon atmosphere. During sintering, a YSZ ceramic phase forms and the organic components decompose, leaving behind amorphous carbon. The carbon formed in situ serves as a hard template, preserving a high surface area YSZ nanomorphology at sintering temperature. The carbon is subsequently removed by oxidation in air at low temperature, resulting in a porous, nanostructured YSZ scaffold. The concentration of the carbon template and the final scaffold surface area can be systematically tuned by varying the glucose concentration in the gel synthesis. The carbon template concentration was quantified using thermogravimetric analysis (TGA), the surface area and pore size distribution was determined by physical adsorption measurements, and the morphology was characterized using scanning electron microscopy (SEM). Phase purity and crystallite size was determined using X-ray diffraction (XRD). This fabrication approach provides a novel, flexible platform for realizing unprecedented scaffold surface areas and nanomorphologies for ceramic-based electrochemical energy conversion applications, e.g. solid oxide fuel cell (SOFC) electrodes.

High Temperature Fabrication of Nanostructured Yttria-Stabilized-Zirconia YSZ Scaffolds by In Situ Carbon Templating Xerogels

A protocol for fabricating porous, nanostructured yttria-stabilized-zirconia (YSZ) scaffolds at temperatures between 1,000 &#176;C and 1,400 &#176;C is presented.

تصنيع درجة الحرارة عالية من ذات البنية النانومترية اليتريا-استقرت-زركونيا (YSZ) السقالات من قبل<em&gt; في الموقع</em&gt; الكربون النموذجيه Xerogels

We demonstrate a method for the high temperature fabrication of porous, nanostructured yttria-stabilized-zirconia (YSZ, 8 mol% yttria - 92 mol% zirconia) ...