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Porous Films (porous + film)
Selected AbstractsMicrowells with Patterned Proteins by a Self-Assembly Process Using Honeycomb-Structured Porous Films,ADVANCED MATERIALS, Issue 18 2008EunHee Min Reactive honeycomb-structured porous films are obtained using amphiphilic block copolymer microwells. This one-step process leads to high functionality inside the pores suitable for the attachement of proteins. As a result, a regular streptavidin array is created by using simple breath figure methology (see figure). [source] Fabrication of Nanoporous Copper Film for Electrochemical Detection of GlucoseELECTROANALYSIS, Issue 21 2009Sirilak Sattayasamitsathit Abstract A nanoporous copper film was fabricated on a copper wire by electrodeposition of copper/zinc alloy and chemically etching of zinc. The surface morphology was investigated by SEM. When applied to detect glucose in an amperometric flow injection system the porous copper electrode provided 12 times higher sensitivity than solid copper. It could be continuously used up to 50 times (%RSD=5.7). Different preparations of the porous film provided reproducible responses (P<0.05). Detection of glucose in E. coli cultivation medium compared well with spectrophotometric technique (P<0.05). This simple technique can produce a nanoporous electrode with good performances and can easily be applied to other metals and analytes. [source] Synthesis of Porous Bi2WO6 Thin Films as Efficient Visible-Light-Active PhotocatalystsADVANCED MATERIALS, Issue 12 2009Li-Wu Zhang Bi2WO6 ordered porous film with open pores, an example of a photocatalytically active ternary metal oxide under visible-light irradiation, is prepared using a simple and reproducible route. The ordered porous Bi2WO6 films exhibited much higher photocatalytic activity and photocurrent coversion efficiency than nonporous Bi2WO6 films under visible-light irradiation (,,>,420,nm). [source] Synchrotron X-ray reflectivity studies of nanoporous organosilicate thin films with low dielectric constantsJOURNAL OF APPLIED CRYSTALLOGRAPHY, Issue 2007Weontae Oh Quantitative, non-destructive X-ray reflectivity analysis using synchrotron radiation sources was successfully performed on nanoporous dielectric thin films prepared by thermal processing of blend films of a thermally curable polymethylsilsesquioxane dielectric precursor and a thermally labile triethoxysilyl-terminated six-arm poly(,-caprolactone) porogen in various compositions. In addition, thermogravimetric analysis and transmission electron microscopy analysis were carried out. These measurements provided important structural information about the nanoporous films. The thermal process used in this study was found to cause the porogen molecules to undergo efficiently sacrificial thermal degradation, generating closed, spherical nanopores in the dielectric film. The resultant nanoporous films exhibited a homogeneous, well defined structure with a thin skin layer and low surface roughness. In particular, no skin layer was formed in the porous film imprinted using a porogen loading of 30,wt%. The film porosities ranged from 0 to 33.8% over the porogen loading range of 0,30,wt%. [source] On electroneutrality condition inside solid conducting porous filmAICHE JOURNAL, Issue 11 2009Saptarshi Majumdar First page of article [source] Highly Porous Nano- and Microstructured Films Loaded with Bioactive Agents for Biomedical Applications: Structure,Release Profile EffectsADVANCED ENGINEERING MATERIALS, Issue 8 2009Adi Rachelson The current study focuses on the nanostructuring of our new drug-eluting porous films and its effect on the drug release profile of both hydrophilic and hydrophobic drugs. Nanostructuring was obtained using both the dispersion and the condensation methods of emulsion processing. These new highly porous nanostructured films can be used as basic elements of various drug-eluting medical devices. [source] Fabrication of Reversibly Crosslinkable, 3-Dimensionally Conformal Polymeric Microstructures,ADVANCED FUNCTIONAL MATERIALS, Issue 20 2008Luke A. Connal Abstract Multifaceted porous materials were prepared through careful design of star polymer functionality and properties. Functionalized core crosslinked star (CCS) polymers with a low glass transition temperature (Tg) based on poly(methyl acrylate) were prepared having a multitude of hydroxyl groups at the chain ends. Modification of these chain ends with 9-anthracene carbonyl chloride introduces the ability to reversibly photocrosslink these systems after the star polymers were self-assembled by the breath figure technique to create porous, micro-structured films. The properties of the low Tg CCS polymer allow for the formation of porous films on non-planar substrates without cracking and photo-crosslinking allows the creation of stabilized honeycomb films while also permitting a secondary level of patterning on the film, using photo-lithographic techniques. These multifaceted porous polymer films represent a new generation of well-defined, 3D microstructures. [source] Microwells with Patterned Proteins by a Self-Assembly Process Using Honeycomb-Structured Porous Films,ADVANCED MATERIALS, Issue 18 2008EunHee Min Reactive honeycomb-structured porous films are obtained using amphiphilic block copolymer microwells. This one-step process leads to high functionality inside the pores suitable for the attachement of proteins. As a result, a regular streptavidin array is created by using simple breath figure methology (see figure). [source] Formation of honeycomb-structured, porous films via breath figures with different polymer architecturesJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 8 2006Martina H. Stenzel Abstract Honeycomb-structured, porous films with pore sizes ranging from 200 nm to 7 ,m were prepared with breath figures. The regularity of the hexagonal array and the pore size was influenced by the polymer architecture and the casting conditions. A nanoscaled suborder next to the microarray was obtained with amphiphilic block copolymers. These films were shown to be suitable as surfaces for cell growth. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 2363,2375, 2006 [source] Influence of the supporting salt concentration on the electrodeposition of ZnO/eosin Y hybrid filmsPHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 10 2008C. Boeckler Abstract ZnO/eosin Y hybrid films were electrodeposited from O2 -saturated ZnCl2 -solution under variation of the concentration of the supporting salt KCl. The supporting salt concentration was found to have a significant influence on the amount of dye loading and the morphology of the ZnO/eosin Y films. By decreasing the supporting salt concentration to 0.01 M KCl, porous films with a high dye loading can be obtained at potentials of ,0.8 V vs. SCE at low eosin Y concentrations in the electrodeposition bath, which usually only lead to porous films at potentials where eosin Y is reduced (< ,0.9 V vs. SCE). (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Electroactive composite systems containing high conductive polymer layers on poly(ethylene) porous films,POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 9-10 2006G. K. Elyashevich Abstract New composite electroactive materials containing conducting polymers were elaborated by oxidative polymerization of aniline and pyrrole onto porous poly(ethylene) films. The morphology of the conducting phase on the surface of the composites was investigated by scanning electron microscopy. The influence of preparation method and porous support structure on electric and mechanical properties of the composite materials was studied. The correlation between the composites electroconductivity and the absorbance of electromagnetic radiation in the IR region was observed. It was found that gas separation and ion-exchange membrane properties of the composites strongly depend on their conductivity and content of conducting component. Copyright © 2006 John Wiley & Sons, Ltd. [source] | |||||||||||||