机理

Effect of pressure on the swelling and fluxes of dense PDMS membranes in nanofiltration: An experimental study

ty10086 提交于 周四, 08/26/2021 - 13:35
Abstract(#br)In Organic Solvent Nanofiltration (OSN), the exact effect of pressure (0.1–5\u003cce:hsp sp=\"0.25\"/\u003eMPa range) on the membrane, mass transfer and membrane selectivity is still unclear despite the many investigations that have been reported in the last decade. The same questions continue to be raised: Does pressure contribute to both convective and diffusive flux? Does pressure induce polymer compaction?

激光辐照和PDMS改性制备工艺对NiTi合金在人体溶液中防腐性能的研究

ty10086 提交于 周三, 08/25/2021 - 16:07
本文提出了一种在NiTi形状记忆合金( SMA )表面制备超疏水表面的新方法,旨在进一步提高NiTi形状记忆合金的耐腐蚀性能和生物相容性。将激光辐照与聚二甲基硅氧烷( PDMS )改性混合,得到水接触角( WCA )为155.4°±0.9°,水滑角( WSA )为4.4°±1.1°的超疏水表面。通过扫描电子显微镜( SEM )和X射线光电子能谱( XPS )对试样的形成机理进行了系统的揭示,并通过动电位极化( PDP )和电化学阻抗谱( EIS )测试研究了试样在模拟体液( SBF )中的防腐性能。PDMS超疏水涂层表现出优越的防腐性能。并进行了Ni离子释放实验,结果表明超疏水样品有效地抑制了电解液和SBF中Ni离子的释放。此外,对生物相容性进行了进一步的分析,表明所制备的超疏水表面在生物相容性方面具有巨大的潜在优势。