XPS

Abstract(#br)Investigations on surface properties of poly(dimethylsiloxane) (PDMS) are justified by its large application ranges especially as coating polymer in fluidic devices. At a micrometer scale, the liquid dynamics is strongly modified by interactions with a solid surface. A crucial parameter for this process is microchannel wettability that can be tuned by acting on surface chemistry and topography. In literature, a number of multi-step, time and cost consuming chemical and physical procedures are reported.

Abstract(#br)Silver localization is obtained on polyimide Kapton ® HN (PI) in step by step processes combining surface treatments (chemical and plasma), microcontact printing (μCP) and electroless metal deposition. There processes are developed in order to obtain silver patterns onto flexible polymer surfaces at the micro and sub-micro scale. Patterns of silver dots or, at the opposite, of holes in silver layer, were obtained using the same PDMS polydimethylsiloxane (PDMS) stamp (positive/negative technology). Processes are based on the same first step, i.e.

Abstract(#br)Polydimethylsiloxane (PDMS) film was treated with RF low-pressure plasmas (LPPs) made of mixtures of oxygen and argon for increasing surface polarity, minimizing hydrophobic recovery (i.e. retard ageing) and increasing adhesion to acrylic adhesive tape for medical use. Statistical design of experiments has been used for determining the most influencing experimental parameters of the LPP treatment of PDMS. Water contact angle values (measured 24\u003cce:hsp sp=\"0.25\"/\u003eh after treatment) and the O/C ratio obtained from XPS experiments were used as response variables.

The coloration behavior of the inorganic/organic hybrids prepared from polydimethylsiloxane (PDMS) and chemically modified metal alkoxides was investigated by ultraviolet-visible (UV-VIS), X-ray photoelectron (XPS) and electron spin resonance (ESR) spectroscopies. Although the hybrids were transparent in the visible region, a broad absorption was observed from the visible to UV regions, leading to a color from yellow to wine-red. The color and the absorption edge of the hybrids depend on the inorganic components derived from metal alkoxides.

The coloration behavior of the inorganic/organic hybrids prepared from polydimethylsiloxane (PDMS) and chemically modified metal alkoxides was investigated by ultraviolet-visible (UV-VIS), X-ray photoelectron (XPS) and electron spin resonance (ESR) spectroscopies. Although the hybrids were transparent in the visible region, a broad absorption was observed from the visible to UV regions, leading to a color from yellow to wine-red. The color and the absorption edge of the hybrids depend on the inorganic components derived from metal alkoxides.

油水分离技术在这些年来一直在不断进步。近来，重力辅助过滤得到了相当多的关注，尽管大部分研究集中在重力作用下容易分离的油水合成混合物。对于机械稳定和化学稳定的乳状液，除静态重力头外，不需要外加外部压力就可以分离是一个挑战。要实现这一目标，过滤介质应具有高孔隙率，以获得高通量，但要控制孔径，以获得高选择性。而且，为了分解乳液，过滤介质表面应赋予超润湿特性。本文综合评述了不同的多孔过滤介质(金属网、有机膜、无机膜、滤纸和三维材料)及其相应的改性技术和/或功能化策略，以改善其性能，实现高效重力驱动过滤应用。

采用三步法合成了含有不同摩尔质量的聚二甲基硅氧烷( PDMS )和聚环氧乙烷( PEO )或聚环氧丙烷( PPO )的嵌段共聚物。利用核磁共振氢谱( 1H NMR )和基质辅助激光解吸电离飞行时间质谱( MALDI-ToF-MS )对功能均聚物嵌段和最终嵌段共聚物进行了表征。然后，这些聚合物被纳入与工业相关的溶剂型涂料配方。利用X射线光电子能谱( XPS )和角度分辨和深度剖面测量相结合的方法，得到了固化涂层前几纳米处嵌段共聚物的浓度剖面。这些两亲性分子被发现具有极高的表面活性，并且只在极少的浓度下观察到PDMS在涂层表面的高度富集。离析的程度对硅氧烷和聚醚嵌段的精确质量都很敏感，其中任一部位尺寸的增大都导致表面富集程度整体下降。PDMS- PPO被发现比PDMS- PEO更与涂层网络相容，这从前者的大幅度下表面富集得到佐证。通过表面张力和水接触角的测量，对液体和固化膜的表面性质进行了表征，证实了XPS所观察到的趋势。对涂层干燥过程中发生的复杂动态过程的表征，是有效调节特定涂层体系的关键。

采用三步法合成了含有不同摩尔质量的聚二甲基硅氧烷( PDMS )和聚环氧乙烷( PEO )或聚环氧丙烷( PPO )的嵌段共聚物。采用质子核磁共振( 1H NMR )和基质辅助激光解吸/电离飞行时间质谱( MALDI-ToF-MS )对功能均聚物嵌段和最终双嵌段共聚物进行了表征。然后，这些聚合物被纳入与工业相关的溶剂型涂料配方。利用X射线光电子能谱( XPS )和角度分辨和深度剖面测量相结合的方法，得到了固化涂层前几纳米处嵌段共聚物的浓度剖面。这些两亲性分子被发现具有极高的表面活性，并且只在极少的浓度下观察到PDMS在涂层表面的高度富集。离析的程度对硅氧烷和聚醚嵌段的精确质量都很敏感，其中任一部位尺寸的增大都导致表面富集程度整体下降。PDMS- PPO被发现比PDMS- PEO更与涂层网络相容，这从前者的大幅度下表面富集得到佐证。此外，通过表面张力和水接触角的测量对液体和固化膜的表面性质进行了表征，证实了XPS的变化趋势。在涂层干燥过程中发生的复杂和动态过程的特性是提供有效调整特定涂层系统以满足与个别应用有关的所需表面特性的能力的关键。