The C-V plots show that peaks are the results of the particular distribution density of the interface states (N-ss), interfacial polymer

layer, and series resistance (R-s) of device. The magnitude of the peaks increases CCI-779 purchase with the increasing illumination intensity and their positions shift from the high forward bias voltage to low forward bias voltages. The C-2-V plots give a straight line in a wide bias voltage region for each illumination intensity. The variation in doping concentration (N-D), depletion layer width (W-D), and barrier height [Phi(B)(C-V)] were obtained from these C-2-V plots. In addition, voltage dependent density distribution profile of N-ss was obtained from both low-high capacitance (C-LF -C-HF) and Hill-Coleman methods. It is observed that there is a good agreement between the results obtained by these methods.

In addition, voltage dependent R-s profile was obtained from C-V and G/omega-V data by using Nicollian and Brews method. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3504598]“
“UV-cured nanocomposite films were prepared from acrylic monomer and two types of nanomaterial: zirconium vinylphosphonate and zirconia, in the presence of a photoinitiator. The films were characterized by FTIR, SEM, and AFM. check details FTIR spectra showed the disappearance of band assigned to the C=C group both of monomer and zirconium vinylphosphonate by polymerization and the presence of the phosphonate group in polymer. The influence of zirconium

vinylphosphonate and zirconia content on thermooxidative degradation of polymeric films was studied by thermogravimetry. SEM and AFM images showed that nanomaterials are dispersed HSP990 order in polymer matrix with no macroscopic phase separation. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 1820-1826, 2011″
“Objective. An early vascular response for angiogenesis is essential for the normal progression of bone defect healing. Vascular endothelial growth factor ( VEGF) is a potent inducer of angiogenesis. The aim of this study was to evaluate the effects of a poly ( L, D-lactic-co-glycolic acid) ( PLGA) membrane with VEGF encapsulated into PLGA microspheres on bone regeneration at bone defects in rat calvaria.

Study Design. Microspheres of PLGA incorporating VEGF165 ( VEGF microspheres) were prepared, and critical-size bone defects were created in rat calvaria. The VEGF microspheres, PLGA microspheres, or VEGF microspheres plus PLGA membrane were applied to the defects. Bone regeneration was evaluated using image analysis based on soft radiographic and histologic examination.

Results. Mature thick bone regeneration was observed in selected sites at bone defects that had been applied with VEGF microspheres/PLGA membrane compared with those that had been applied with the other treatments.

Conclusion. A combination of VEGF microspheres and a PLGA membrane effectively enhances bone regeneration.