超疏水表面

Abstract(#br)We report a simple and inexpensive method for producing super-hydrophobic surfaces through direct replication of micro/nano-structures on polydimethylsiloxane (PDMS) from a replication master prepared by ultrafast-laser texturing process. Gratings were obtained on 304L stainless steel plate using picosecond laser ablation. It has been used as a master with grating areas of different structural features. PDMS negative replica was prepared from the masters, and PDMS positive replica was prepared from the negative replica thereafter.

Abstract(#br)A process to fabricate superhydrophobic surfaces on metals and polymers is presented. Using high speed femtosecond laser pulses, surface structures have been created on metal surfaces and transferred onto Polydimethylsiloxane (PDMS) to achieve superhydrophobic surfaces. Various surface micro and nano structures are presented and their wetting properties are discussed. Water contact angles of over 150° with a roll off angle of less than 5° were achieved on the textured copper and PDMS surfaces.

Abstract(#br)Superhydrophobic surfaces with extremely low wettability have attracted attention globally along with their remarkable characteristics such as anti-icing, anti-sticking, and self-cleaning. In this study, a facile and cost-effective approach of fabricating patternable superhydrophobic surfaces, which can be applied on various substrates (including large area and 3D curvilinear substrates), is proposed with a salt-dissolution-assisted etching process. This novel proposal is environmentally benign (entirely water-based and fluorine-free process).

通过MAO处理耦合在烧结NdFeB磁体上喷涂T-ZnOw / PDMS，制备了氧化锌晶须/聚二甲基硅氧烷-微弧氧化( T-ZnOw / PDMS- MAO )复合涂层。采用SEM、XRD、FT-IR、加速浸泡试验和电化学试验分别考察了复合镀层的表面形貌、化学成分和耐腐蚀性能。研究了复合镀层对NdFeB磁体磁性能的影响。结果表明，复合镀层对NdFeB磁体的磁性能无明显影响。MAO涂层的多孔结构被PDMS分子有效封闭，T-ZnOw / PDMS复合涂层表现出优异的超疏水性能，接触角为168.67  ± 5.71°，滑动角为5.12  ± 2.81°，T-ZnOw / PDMS- MAO复合涂层能显著增强烧结NdFeB磁体的耐腐蚀性能。

如今，增加CO2排放量是世界各国面临的必然挑战之一。此外，在许多行业，化石燃料是导致问题恶化的主要能源需求来源。由于在大多数应用中，拖曳力对性能和能量损失的影响很大，人们提出了许多研究来改善表面性质，使其在水面上运动，从而提高减阻效果。为此，一种有效的方法是利用超疏水涂层。本研究利用HMDS ( 1，1，1，3，3，3 -六甲基二硅氮烷)和PDMS (端羟基聚二甲基硅氧烷)修饰的Al2 O3纳米粒子( NPs )在水性聚氨酯( WBPU )树脂中制备了两种不同的超疏水涂层，分别命名为HS和PS。涂层基材表现出明显的拒水性，HS和PS涂层的实测接触角分别为158.6°和153.2°。结果表明，PS和HS涂层的减阻率分别提高了18.771 %和16.141 %。此外，观察到超疏水管道中的摩擦系数明显下降。此外，为了显示合成表面的耐久性，使用纯水、海水、碱性和酸性溶液浸泡试验。

由于稠油在常温下流动性差，稠油的有效脱除和回收仍然是一个棘手的问题。在石油修复中，传统的吸附材料通常表现出低的吸附效率和易破坏的超疏水表面。本工作通过简单聚合和浸涂的方法，构建了聚二甲基硅氧烷( PDMS ) /聚苯胺( PANI )修饰的三聚氰胺海绵( MS )具有鲁棒超疏水涂层。独特的PANI涂层赋予PDMS / PANI @ MS优异的光热转换效率，在1个标准太阳光( 1   kW / m2 )的照射下，2   min内表面平衡温度迅速上升至81.8   ° C；高效的光热转换使吸收剂海绵显著降低油液黏度，便于吸收，吸收量为11.68   ×   105 g / m3，优于先前报道的吸收剂。改性海绵在稳定的表面结构和良好的弹性基础上赋予其优异的可重复使用性，显示了其在稠油溢油修复中的应用潜力。

由于稠油在常温下流动性差，稠油的有效脱除和回收仍然是一个棘手的问题。在石油修复中，传统的吸附材料通常表现出低的吸附效率和易破坏的超疏水表面。本工作通过简单聚合和浸涂的方法，构建了聚二甲基硅氧烷( PDMS ) /聚苯胺( PANI )修饰的三聚氰胺海绵( MS )具有鲁棒超疏水涂层。独特的PANI涂层赋予PDMS / PANI @ MS优异的光热转换效率，在1个标准太阳光( 1   kW / m2 )的照射下，2   min内表面平衡温度迅速上升至81.8   ° C；高效的光热转换使吸收剂海绵显著降低油液黏度，便于吸收，吸收量为11.68   ×   105 g / m3，优于先前报道的吸收剂。改性海绵在稳定的表面结构和良好的弹性基础上赋予其优异的可重复使用性，显示了其在稠油溢油修复中的应用潜力。