نتایج جستجو برای: polymeric matrix
تعداد نتایج: 386372 فیلتر نتایج به سال:
During the last two decades, hydrophilic swellable polymers have been widely used to control the release of a drug from matrix tablet formulations. The increasing need for suitable polymers to achieve the desired drug release profile conducted the pharmaceutical research to widely screening a large variety of both synthetic and natural polymers which show drug release retarding ability. Because...
X-ray computed tomography (XCT) provides a volumetric map of a specimen in three dimensions, generated from a set of radiographs. Due to the speed and quality of measurement, XCT systems with cone beam geometry and matrix detectors have become widely used. Continuous improvements in the quality and performance of Xray tubes and devices have led to cone beam XCT systems which can now achieve spa...
Understanding the photoexcitation processes in semiconductors is critical for the design of advanced photocatalytic materials. Nevertheless, traditional viewpoints focus on photogenerated free charge carriers, which are somehow invalid once the many-body effects are taken into account, especially for polymeric photocatalysts. Here we systematically investigate the photoexcitation processes invo...
Understanding the photoexcitation processes in semiconductors is critical for the design of advanced photocatalytic materials. Nevertheless, traditional viewpoints focus on photogenerated free charge carriers, which are somehow invalid once the many-body effects are taken into account, especially for polymeric photocatalysts. Here we systematically investigate the photoexcitation processes invo...
The natural fiber market has been growing extraordinarily. Hereupon the current work presents of periquiteira tree Cochlospermum orinocense Amazon forest. chemical composition, physical aspects, morphology, thermal and mechanical properties this will be discussed. stability samples was about 200 °C. decomposition cellulose hemicelluloses in fibers occurred at 300 ºC above, while degradation hap...
Magnetic properties of nanocomposite materials obtained by dispersing barium ferrite nanoparticles within polystyrene-butadiene-styrene block copolymer, in the temperature range, 300 to 500 K are reported. The temperature dependence of the magnetization at saturation, averaged uniaxial magnetocrystalline anisotropy, and coercive field of thick films are analyzed. A "matrix effect" was noticed w...
Four point bend tests were conducted on two previously characterized particulate filled thermoplastic and thermoset polymeric coatings, the acoustic emission (AE) method being utilized to monitor the damage progress during the tests. Different damage mechanisms operating in the polymeric coatings can be recognized by the different amplitude range of the AE signals emitted. AE can be used to ass...
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