Physical properties including saturation magnetization, Curie temperature (T-C), magnetoresistance and metal-insulator
transition temperature (T-MI), all show systematic trends as the deposition frequency varies. This study reveals that the domain/GBs tunability achieved in nanocomposite thin films can affect the lattice strain and further tune their ferromagnetic properties. (C) 2011 American Institute of Physics. [doi:10.1063/1.3552594]“
“The electron-beam preirradiation and reactive extrusion technologies were used to prepare maleic anhydride (MAH)/vinyltrimethoxysilane (VTMS)-co-grafting polypropylene (PP) as a high-performance compatibilizer for wood-flour/PP composites. The grafting content, chemical structure, and crystallization behavior of the compatibilizers were characterized through
Fourier transform infrared spectroscopy, differential scanning calorimetry, and an BIRB 796 extraction method. The effects of the compatibilizers on the mechanical properties, water absorption, morphological structure, and torque rheological behavior of the composites were investigated comparatively. The experimental results demonstrate that MAH/VTMS-g-PP markedly enhanced the mechanical properties of the composites. Compared with MAH-g-PP and VTMS-g-PP, MAH/VTMS-g-PP clearly showed synergistic effects on the increasing mechanical properties, water absorption, and compatibility of the composites. Scanning electron microscopy further confirmed that the adhesion and dispersion of wood flours in the composites were effectively improved by MAH/VTMS-g-PP. These results were also proven by the best Givinostat mw water resistance of the wood-flour/PP composites with MAH/VTMS-g-PP. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 402-409, 2011″
“Objective. The objective of this study was to investigate the surface porosity of hand-mixed, syringe-mixed and encapsulated set endodontic sealers using image
analysis.
Study design. Eight different CHIR 99021 root canal sealers (AD Seal/Meta Biomed; AH Plus/Dentsply; MM Seal/Micromega; AH Plus Jet/Dentsply; EndoREZ/Ultradent; Epiphany/Pentron; GuttaFlow/Coltene; RealSeal/Sybron Endo) were prepared in accordance with the manufacturer’s recommendations and dispensed into plastic rings (n = 10/group). Following set of the specimens, scanning electron photomicrographs of the sealer surfaces were taken at standard magnification. The area fraction and the minimum-maximum diameters of surface pores were calculated on the micrographs using ImageJ open-source image analysis software. Statistical comparisons were made between the sealers with respect to the area fractions and number of pores (Kruskal-Wallis test, P < .05).
Results. The endodontic sealers differed significantly in both the percentage of area fraction and pore count (P < .001). The surface porosity of the methacrylate-based sealers Epiphany and RealSeal were significantly lower than those of resin-and silicone-based sealers.
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