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PC Films (pc + film)

Distribution by Scientific Domains

Polymers and Materials Science	100%

Distribution within Polymers and Materials Science

General & Introductory Materials Science	37%

Selected Abstracts

Fabrication of optical waveguide devices using gas-assisted UV micro/nanoimprinting with soft mold

POLYMERS FOR ADVANCED TECHNOLOGIES, Issue 11 2007
Y.-J. Weng
Abstract Wavelength limitation and diffraction of light are the bottlenecks encountered in the production of structures by conventional lithography. Nano-imprinting has been a potential process for mass production of nanometer structures at low cost. This paper reports an innovative process to replicate the ridge-shaped microstructures on the silicon mold onto the photoresist using gas-assisted pressing mechanism and soft mold. The microstructures on the silicon mold are replicated unto PC films. The soft mold is obtained by casting the PDMS with the PC film as templates, PDMS mold and UV-curable photoresist are brought into contact, and are pressurized by gas and cured by UV-light at the same time. After curing, structures for optical wave guilding can be obtained, In this process, through the control of gas pressure, the residual layer of the ridge-shaped component for light guilding can eliminated. Etching is no longer needed to get rid of the residual layer. This process is effective for mass production for replication of microstructures at low cost. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Photonic Crystals in Bioassays

ADVANCED FUNCTIONAL MATERIALS, Issue 18 2010
Yuanjin Zhao
Abstract Photonic crystal (PC) based bioassay techniques have many advantages in sensitive biomolecular screening, label-free detection, real-time monitoring of enzyme activity, cell morphology research, and so on. This study provides an overall survey of the basic concepts and up-to-date research concerning the very promising use of PC materials for bioassays. It includes the design and application of PC films, PC microcarriers, PC fibers, and PC optofluidics for fluorescence enhancement or label-free bioassays. Emphasis is given to the description of the functional structures of different PC materials and their respective sensing mechanisms. Examples of detecting various types of analytes are presented. This article promotes communication among chemistry, biology, medicine, pharmacy, and material science. [source]

Self-Assembled Silica Photonic Crystal as a Liquid-Crystal Alignment Layer and its Electro-optic Applications in Fabry,Perot Cavity Structures,

ADVANCED MATERIALS, Issue 19 2004
Y. Ha
Microgrooves on self-assembled photonic-crystal (PC) films align liquid crystals (LCs) without any additional rubbing or surface treatment. Nematic (see Figure and inside cover) or twisted-nematic LCs can be formed, depending on the relative orientation of the microgrooved films. A LC Fabry,Perot (FP) cavity was fabricated using these PC films, and electro-optic tuning of FP cavity modes is demonstrated. [source]

Stabilization of Polymer Bilayers by Introducing Crosslinking at the Interface,

MACROMOLECULAR RAPID COMMUNICATIONS, Issue 12 2006
Narong An
Abstract Summary: Bisphenol A solid epoxy serves as an effective reaction compatibilizer to the bisphenol A polycarbonate (PC)/PMMA bilayer systems. Addition of epoxy to the bottom PMMA layer can retard or even prevent the dewetting of PC films by introducing crosslinking between both components at the interface. This is the first investigation of polymer bilayers stabilized by chemical reactions. AFM topographic image of a representative dewetting hole. [source]

Interfacial characteristics of film insert molded polycarbonate film/polycarbonate-acrylonitrile-butadiene-styrene substrate, part 1: Influence of substrate molecular weight and film thickness

POLYMER ENGINEERING & SCIENCE, Issue 12 2006
Y.W. Leong
Adhesion properties between a polycarbonate (PC)/acrylonitrile-butadiene-styrene blend substrate and PC films of various thicknesses, bonded through film insert molding, were investigated. The use of various molecular weights of PC and incorporation of PC-oligomer in the blend substrate has been found to severely affect the adhesion strength and alter the delamination characteristics at the film,substrate interface. Thicker films were able to increase film,substrate adhesion, apart from providing added impact resistance to a brittle substrate. Polym. Eng. Sci. 46:1674,1683, 2006. © 2006 Society of Plastics Engineers [source]

Fabrication of optical waveguide devices using gas-assisted UV micro/nanoimprinting with soft mold

Ultra-Small-Angle X-Ray Scattering Study of PET/PC Nanolayers and Comparison to AFM Results

MACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 13 2008
Fernando Ania
Abstract The forced assembly of two immiscible polymers, produced by layer-multiplying co-extrusion, is analyzed by means of USAXS. Comparison of scattering and AFM results sheds light on many details of the nanolayered structure in PET/PC films. The role played by the volume concentration and cold crystallization of PET on the experimental scattering is discussed. The appearance of at least two scattering maxima in all cases, corresponding to higher orders of the same repeating distance, accounts for the high regularity of the developed nanostructure. It is finally shown that long spacing values, derived from a localized area in AFM, are in a good agreement with the USAXS values averaged over much larger areas. [source]

Organic Photovoltaic Cells Based On Solvent-Annealed, Textured Titanyl Phthalocyanine/C60 Heterojunctions

ADVANCED FUNCTIONAL MATERIALS, Issue 12 2009
Diogenes Placencia
Abstract Organic photovoltaic cells (OPV) with good near-IR photoactivity are created from highly textured titanyl phthalocyanine (TiOPc)/C60 heterojunctions. Vacuum deposited TiOPc thin films are converted to the near-IR absorbing "Phase II" polymorph using post-deposition solvent annealing. The Phase I,,,Phase II transition broadens the absorbance spectrum of the Pc film producing absorptivities (,,,,105,cm,1) from 600,900,nm, along with substantial texturing of the Pc layer. Atomic force microscopy and field-emission scanning electron microscopy of the solvent annealed films show that the surface roughness of the Pc layers is increased by a factor of greater than 2× as a result of the phase transformation. Current,voltage (J,V) responses for white light illumination of ITO (100,nm)/TiOPc (20,nm)/C60 (40,nm)/BCP (10,nm)/Al (100,nm) OPVs show a near doubling of the short-circuit photocurrent (JSC), with only a small decrease in open-circuit photopotential (VOC), and a concomitant increase in power conversion efficiency. Incident photon current efficiency (IPCE) plots confirmed the enhanced near-IR OPV activity, with maximum IPCE values of ca. 30% for devices using Phase II-only TiOPc films. UV-photoelectron spectroscopy (UPS) of TiOPc/C60 heterojunctions, for both Phase I and Phase II TiOPc films, suggest that the Phase II polymorph has nearly the same HOMO energy as seen in the Phase I polymorph, and similar frontier orbital energy offsets, EHOMOPc,ELUMOC60, leading to comparable open-circuit photovoltages. These studies suggest new strategies for the formation of higher efficiency OPVs using processing conditions which lead to enhance near-IR absorptivities, and extensive texturing of crystalline donor or acceptor films. [source]