润湿性

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)Designing hydrophobic surfaces with controllable wettability has attracted much interest in the recent times. The present study seeks to simulate the static and dynamic wetting behavior of liquid droplets on horizontal flat and microgrooved surfaces and compare the findings with experimentally obtained data. Using an open-source software, a 3D drop-shape model is developed to numerically analyze the shape of liquid droplets and anisotropic wetting for a wide range of parametric space.

Abstract(#br)Fabrication of microscale surface structures is a promising method for controlling the surface wettability of materials. Herein, the micropillar and microhole arrays of polydimethylsiloxane (PDMS) were fabricated through a soft lithography process, and the modified wettability was investigated. Using PDMS samples with different degrees of crosslinking, a PDMS–PDMS pattern transfer was achieved, and the microhole and micropillar arrays were obtained from a single master substrate.

Abstract(#br)We report evaporation of ethanol/water mixture droplets on both pillar-arrayed and micro-holed polydimethylsiloxane (PDMS) surfaces.

Polydimethylsiloxane (PDMS) is a promising biomaterial for generating artificial extracellular matrix (ECM) like patterned topographies, yet its hydrophobic nature limits its applicability to cell-based approaches. Although plasma treatment can enhance the wettability of PDMS, the surface is known to recover its hydrophobicity within a few hours after exposure to air.

AbstractTwo microporous organic frameworks based on adamantane (hereafter denoted as MF-Ads) were fabricated through Sonogashira-Hagihara coupling polycondensation of aryl halides and alkynes. Results show that both types of MF-Ad networks had similar porous properties and exhibited excellent CO2 uptake capacity (72.5 cm3 g−1) and CO2/N2 selectivity (59.1) at 273 K and 1.0 bar. Taking advantage of the superhydrophobic wettability of the resulting MF-Ad networks, wire mesh scaffolds were used to fabricate superhydrophobic films with polydimethylsiloxane (PDMS) acting as a binder.

本研究采用水热法成功合成了BiOI，然后分别用六甲基二硅氧烷( HMDS )和聚二甲基硅氧烷( PDMS )对其进行改性，以实现对材料的可控水接触角。采用X射线衍射( XRD )、X射线光电子能谱( XPS )、扫描电子显微镜( SEM )、透射电子显微镜( TEM )、Brunauer-Emmett-Teller ( BET )法、紫外-可见漫反射光谱( DRS )、傅里叶变换红外光谱( FTIR )和水接触角( WCA )等技术对改性BiOI的物理化学性质进行了表征。与未改性BiOI相比，HMDS-和PDMS改性BiOI在暗反应30   min后，在可见光照射28   min，对17α-炔基雌二醇( EE2 )具有更高的光催化活性。用HMDS和PDMS改性BiOI时，WCA增加。当HMDS和PDMS改性BiOI的WCA分别控制在25.3 ~ 32.7 μ ε和38.1 ~ 78.5 μ ε范围内时，光催化性能较好。当改性BiOI的WCA为29.7μ ( 1.00 m L HMDS )和47.8μ ( 0.20 m L PDMS )时，光催化性能最好，EE2去除率分别为98.85 %和98.72 %，而未改性BiOI的去除率为85.01 %。BiOI ( 1.00mL HMDS )和BiOI ( 0.20mL PDMS )的反应速率常数分别是未改性BiOI的2.33和2.15倍。

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。

本文将纳米TiO2负载到无定形SiO2微球表面制备SiO2 - TiO2复合粒子，并用PDMS对其进行改性，得到SiO2 - TiO2 @ PDMS三元复合物。对SiO2 - TiO2 @ PDMS的光催化性能和涂层表面的润湿性进行了测试和表征。并研究了SiO2 - TiO2 @ PDMS的微观结构和组成对其性能的影响。结果表明，SiO2-TiO2 @ PDMS具有一定的光催化活性，涂层几乎超疏水。进一步，SiO2 - TiO2 @ PDMS涂层的润湿性和对水滴的粘附性受热处理温度的影响，对上述现象的机理也进行了分析。此外，该涂层对酸性( pH   =  2 )、碱性( pH   =  11 )和有机染料液滴均具有良好的驱避效果。一个机械损伤的涂层保持了其拒液性，说明涂层具有良好的机械稳定性。在紫外光照射8   h后，所制备涂层的超疏水性能没有下降，说明所制备的涂层具有较大的抗紫外光照射能力。此外，所制备的涂层对环境友好，不含氟化物，因此适合实际应用。