硅烷化

Abstract(#br)Gas transport behaviors of oxygen (O 2 ), nitrogen (N 2 ) and propylene (C 3 H 6 ) in polydimethylsiloxane (PDMS) mixed matrix membranes (MMM) containing modified silica (SiO 2 ) nanoparticles are presented. Two surface modified SiO 2 nanoparticles, silica dimethyloctyl silane (Si-DMOS) and silica dimethylphenyl silane (Si-DMPS), were used as fillers. Surface modification was carried out through silanization, which was confirmed via Fourier transform infrared spectroscopy.

Abstract(#br)Mesoporous MCM-41 silica spheres were synthesized via modified Stöber method and modified by silylation. The MCM-41 pore structures, surface properties and morphological features before and after modification were examined by XRD, SEM, TEM, FT-IR, TGA, 29 Si CP/MAS NMR and nitrogen adsorption–desorption. The results showed that the obtained MCM-41 silica had ordered mesoporous structure and spherical morphology. After silylation, the surface property of MCM-41 silica changed from hydrophilic to hydrophobic, whereas the MCM-41 framework and morphology were retained.

Abstract(#br)In the present study, the effect of atmospheric pressure plasma treatment (APPT) on polymethyl methacrylate (PMMA) substrates was investigated in terms of both the chemical and topographical changes introduced to the polymer surface and its influence on PMMA-to-glass adhesion. The use of a silane-based primer in this bonding system was also studied. The changes introduced to the PMMA surface, as a result of plasma processing, were identified using a combination of: X-ray photoelectron spectroscopy (XPS); atomic force microscopy (AFM), and; contact angle analysis (CA).

活细胞通过特定的机制产生牵引力来感知和响应机械信号。微柱对细胞力的定量可以受到微柱刚度、制作工艺和蛋白质的微接触印刷的限制。本文设计了长径比分别为6和3.5、弹簧常数分别为4.7和28 µ N µ m-1的SiO2 / Parylene C微柱。在微柱的上部涂复了一层250 nm的SiO2层，证实了蛋白质通过SiO2界面在微柱上的沉积和微柱侧壁的无粘结性。结果表明，微柱基基底不存在细胞毒性，且其刚度对其有依赖性。Stiffer微柱增强了细胞黏附和增殖率，获得了更强的约25μN的细胞力。SiO2 / Parylene C微柱的主要贡献是消除了涉及制备聚二甲基硅氧烷邮票的步骤，因为该阵列可以通过SiO2化学实现蛋白质的共价结合。这些微柱矗立在Si片上，因此，底层聚合物膜的任何翘曲都不必考虑。此外，SiO2 / Parylene C微柱可以拓宽待细胞探测的较硬基底的范围。