6-2 mm. Different microstructures in different layers of the sandwiched structure resulted in different functions. The pore structure in the inner PLGA
and middle fibrin layers was beneficial for nutrient transference, whereas the solid structure without pores in the outmost surface of the outer PLGA layer could prevent fluid from leaking during in vitro culturing and in vivo implantation. This study showed that this can be a promising approach for the fabrication of synthetic-polymer-sandwiched viable cell/hydrogel constructs for wide potential application in complex organ manufacturing. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 120: 1199-1207, 2011″
“Influences of oxygen partial pressure, P(O2),
of ambient atmosphere and temperature on surface tension and its temperature coefficient for molten iron were experimentally investigated selleck chemicals llc by an oscillating droplet method using an electromagnetic levitation furnace. We successfully measured the surface tension of molten iron over a very wide temperature range of 780 K including undercooling condition in a well controlled P(O2) atmosphere. When P(O2) is fixed at 10(-2) Pa at the inlet of the chamber, a “”boomerang shape”" temperature dependence of surface tension was experimentally observed; surface tension increased Selonsertib price and then decreased with increasing temperature. The pure surface tension of molten iron was deduced from the negative temperature coefficient in the boomerang shape temperature dependence. When the surface tension was measured under the H(2)-containing gas atmosphere, see more surface tension did not show a linear relationship against temperature. The temperature dependence of the surface tension shows anomalous kink at around 1850 K due to competition between the temperature dependence of P(O2) and that of the equilibrium constant of oxygen adsorption. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3527917]“
“Silicone epoxy (SiE) resins were synthesized through the hydrolytic condensation of 2-(3,4-epoxycyclohexylethyl) methyldiethoxysilane (EMDS) and the cohydrolytic condensation of EMDS with
dimethyldiethoxysilane. Structural characterization was carried out by H-1-NMR, Si-29-NMR, and mass spectrometry analysis; the resins were linear oligomers bearing different numbers of pendant epoxy groups, and the average number of repeat Si-O units ranged from 6 to 11. Methyhexahydrophthalic anhydride was used to cure the SiE resins to give glassy materials with high optical clarity. The cured SiE resins showed better thermal stability and higher thermal and UV resistances than a commercial light-emitting diode package material (an epoxy resin named CEL-2021P). The effect of the epoxy value on the thermal and mechanical properties and the thermal and UV aging performances of the cured SiE resins were investigated.