• 한국분말재료학회지
• /
• 제23권3호
• /
• pp.189-194
• /
• 2016

We report a facile method for preparing KIT-1 mesoporous silicates with two different macroporous structures by dual templating. As a template for macropores, polystyrene (PS) beads are assembled into uniform three dimensional arrays by ice templating, i.e., by growing ice crystals during the freezing process of the particle suspension. Then, the polymeric templates are directly introduced into the precursor-gel solution with cationic surfactants for templating the mesopores, which is followed by hydrothermal crystallization and calcination. Later, by burning out the PS beads and the surfactants, KIT-1 mesoporous silicates with macropores are produced in a powder form. The macroporous structures of the silicates can be controlled by changing the amount of EDTANa4 salt under the same templating conditions using the PS beads and inverse-opal or hollow structures can be obtained. This strategy to prepare mesoporous powders with controllable macrostructures is potentially useful for various applications especially those dealing with bulky molecules such as, catalysis, separation, drug carriers and environmental adsorbents.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2007년도 춘계학술대회
• /
• pp.9-12
• /
• 2007

The transport mechanisms of the MTES (methyltriethoxysilane) templating silica/a-alumina composite membrane were evaluated by using four binary and one quaternary hydrogen mixtures through permeation experiments at unsteady- and steady-states. Since the permeation flux in the MTES membrane, through the experimental and theoretical studies, was affected by molecular sieving effects as well as surface diffusion properties, the kinetic and equilibrium separation should be considered simultaneously according to molecular properties. In order to depict the transient multi-component permeation on the templating silica membrane, the GMS (generalized Maxwell-Stefan) and DGM (dust gas model) were adapted to unsteady-state material balance.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
• /
• pp.132.2-132.2
• /
• 2010

Mesoporous tinoxide ($SnO_2$) as anode materials for Li-ion battery were prepared by hydrothermal method and templating method using SBA-15 as template. And electrochemical properties of $SnO_2$ electrode were investigated with cyclic voltammogram (CV). The morphology and structures of $SnO_2$ were characterized by transmission electron microscopy (TEM) and X-ray diffractometer (XRD), respectively. The specific surface area was defined by $N_2$ adsorption with BET(Brunauer-Emmett-Teller) method. As a result, the surface area of mesoporous $SnO_2$ which was made from templating method is higher than the case of using hydrothermal method. In addition, in anodic performance, mesoporous $SnO_2$ which is prepared by templating method showed higher charge-discharge capasity compared to hydrothermal method and exhibited excellent stability over the entire cycle number. It was indicated that electrochemical performances of mesoporous $SnO_2$mainly affected to the structural features, such as specific surface area and porosity.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2010년도 하계학술대회 논문집
• /
• pp.17-17
• /
• 2010

We investigate CO gas sensing properties of multilayered TiO2 thin film gas sensors fabricated by colloidal templating of 300 nm of polymer spheres. Compared with plain films, the multilayered films show enhanced gas sensing with higher sensitivity and faster response. Also, colloidal templating by using smaller spheres (300 nm in diameter) leads to close-packed multilayered TiO2 thin films with very large-scale. This result suggest that understanding and control of the structures on the sensing properties of multilayered TiO2 thin films by colloidal templating is important in developing the films for real applications.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2006년도 추계학술대회
• /
• pp.336-339
• /
• 2006

With the steady depletion off fossil fuel reserves, hydrogen based energy sources become increasingly attractive. Therefore hydrogen production or separation technologies, such as Bas separation membrane based on adsorption technology, have received enormous attention in the industrial and academic fields. In this study, the transport mechanisms of the MTES (methyltriethoxysilane) templating silica/a-alumina composite membrane were evaluated by using unary, binary and quaternary hydrogen gas mixtures permeation experiments at unsteady- and steady-states. Since the permeation flux in the MTES membrane, through the experimental and theoretical study, was affected by molecular sieving effects as well as surface diffusion properties, the kinetic and equilibrium separation should be considered simultaneously in the membrane according to molecular properties. In order to depict the transient multi-component permeation on the templating silica membrane, the GMS (generalized Maxwell-Stefan) and DGM (dust Bas model) were adapted to unsteady-state material balance

• 한국재료학회:학술대회논문집
• /
• 한국재료학회 2012년도 춘계학술발표대회
• /
• pp.97.1-97.1
• /
• 2012

Porous ceramics are widely used for applications such as catalysis supports, gas distributors and filters such as DPF. For these purpose, it is important to have proper porosity controlling pore structure while maintaining mechanical and thermal properties. In this work, we have prepared the porous ceramic structures made of reaction bonded silicon nitride with hierarchical pore structures. Uni-directionally aligned pore channels, which are mostly filled with ${\beta}$-Si3N4 whiskers, were achieved by an ice-templating method. The structures of the pore channels and the walls are controllable by the processing conditions, such as solid concentration, freezing rate of the slurry, and additives. We have investigated and characterized the influences of the conditions on the microstructures and the properties, such as porosity, pore size distribution, lamellar thickness, wavelength, and orientations. The compressive strength test and flow test was performed to determine the structural integrity and air permeability.

• 한국가스학회지
• /
• 제8권3호
• /
• pp.43-51
• /
• 2004

GMS(generalized Maxwell Stefan) 모형을 이용하여 나노기공성 TPABr (Tetrapropylammoniumbromide) templating 실리카/알루미나 복합막에서 $CO_2$와 $N_2$의 투과 및 분리 특성을 해석하였다. 담체로 쓰이는 메조포러스 알루미나 지지체에서의 기체 투과는 누슨 확산 (Knudsen diffusion) 및 점성 확산 (viscous diffusion 혹은 Poiseuille flow)에 의존하였으며, 이러한 투과메커니즘은 DGM (dusty gas model)을 통하여 규명할 수 있었다. 본 연구에 사용한 복합막의 분리 특성을 결정 짖는 TPABr templating silica layer의 경우 강한 흡착 특성으로 인하여, 기공 확산보다는 표면 확산(surface diffusion)을 나타내었다. 따라서 GMS 모형을 통해 다성분계의 표면 확산 투과/분리 메커니즘을 성공적으로 해석할 수 있었다. 본 연구에서 사용된 복합무기막에서는 흡착량과 표면 확산 현상이 복합적으로 일어나기 때문에, 강흡착질인 $CO_2$와 비교적 약흡착질인 $N_2$ 혼합물 분리에 있어, $CO_2$의 pore-blocking 현상으로 인해 $CO_2$가 투과 농축되었다.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2002년도 추계학술발표논문집 (하)
• /
• pp.1777-1780
• /
• 2002

This paper presents a well-designed templating system for CMS web Publication using XML/XSL technology. The primary motivation is the need of Web CMS to separate content from layout and logic. Our system provides GUI XSLT editor (x-editor) to create and modify XSLT stylesheet documents easily. These documents are used to add "layout" and "look and feel" information to XML document which contains content and functionality. The modified XML document is processed by XML-template engine to produce dynamic or static web sites.

• 폴리머
• /
• 제34권4호
• /
• pp.289-293
• /
• 2010

비스트리에톡시시릴에탄(bis(triethoxy silyl) ethane)을 전구체로 도데실 트리메틸암모늄 브로마이드(dodecyl trimethyl ammonium bromide), 세틸 트리메틸암모늄 브로마이드(cetyl trimethyl ammonium bromide), 그리고 옥타데실 트리메틸암모늄 브로마이드(octadecyl trimethyl ammonium bromide)를 구조유도체로 사용하여 주기적인 메조포러스 유기실리카(periodic mesoporous organosilicas)(PMO)를 합성하였다. 합성된 PMO의 경우 구조유도 체로서 사용한 계면활성제의 알킬기가 증가할수록 PMO의 표면적과 기공부피가 감소하였으나 기공의 직경에는 영향 이 없었다. 그리고 합성된 PMO에 폴리에틸렌을 삽입한 결과 사용한 구조유도체의 알킬기의 크기에 따라서 폴리에 틸렌의 삽입과정에 많은 영향이 있었으나, 폴리(에틸렌 옥사이드)의 경우 합성된 PMO의 특성에 영향이 거의 없음을 XRD와 DSC로 확인하였다. 또한, 고분자의 열안정성을 확인한 결과 PMO에 삽입된 고분자의 열분해 온도가 증가함 을 알 수 있었다.

• Applied Science and Convergence Technology
• /
• 제23권6호
• /
• pp.351-356
• /
• 2014

The electronic structure at organic-organic interface gives essential information on device performance such as charge transport and mobility. Especially, the molecular orientation of organic material can affect the electronic structure at interface and ultimately the device performance in organic photovoltaics. The molecular orientation is examined by the change in ionization potential (IP) for metal phthalocyanines (MPc, M=Zn, Cu)/fullerene ($C_{60}$) interfaces on ITO by adding the CuI templating layer through ultraviolet photoelectron spectroscopy measurement. On CuPc/$C_{60}$ bilayer, the addition of CuI templating layer represents the noticeable change in IP, while it hardly affects the electronic structure of ZnPc/$C_{60}$ bilayer. The CuPc molecules on CuI represent relatively lying down orientation with intermolecular ${\pi}-{\pi}$ overlap being aligned in vertical direction. Consequently, in organic photovoltaics consisting of CuPc and $C_{60}$ as donor and acceptor, respectively, the carrier transport along the direction is enhanced by the insertion of CuI templaing layer. In addition, optical absorption in CuPc molecules is increased due to aligned transition matrix elements. Overall the lying down orientation of CuPc on CuI will improve photovoltaic efficiency.