超疏水

在聚乙烯醇( PVA )水溶液和聚二甲基硅氧烷( PDMS )乙醇水溶液中，采用简单的绿色溶液浸渍法制备了超疏水三聚氰胺甲醛泡沫( SMF )。将MF从水溶液中转移到乙醇中，得到的相分离PVA能够在MF骨架上形成微纳结构，从而使泡沫表面具有相当的粗糙度。随着PDMS的交联，表面形成了疏水涂层。改性泡沫表现出超疏水特性(水接触角157°，水滑角7° )。评价了其对不同有机溶剂的吸收能力。同时，为了验证油水分离效率，设计了一种简单的将改性泡沫块与真空系统连接的油水分离装置。改性后的泡沫除具有优异的油水分离性能外，还表现出良好的压缩性能，在pH为1 ~ 13的溶液中表现出优异的耐腐蚀性能，可循环使用150次，力学性能提高，阻燃性能提高。与传统的多孔超疏水吸收剂涉及复杂的方法和纳米材料相比，这种以简单、低成本、环境友好的方式制备的高效超疏水吸收剂在处理溢油和工业有机污染方面具有广阔的前景。

Fabrication of Superhydrophobic Film with Uniform Structures Using Two Step Lithography and Nanosilica CoatingTwo step lithography;Edge beads;Superhydrophobic;Transparent;Flexible;We propose a two-step lithography process to minimize edge-bead issues caused by thick photoresist (PR) coating. In the conventional PR process, the edge bead can be efficiently removed by applying an edge-bead removal (EBR) process while rotating the silicon wafer at a high speed.

Abstract(#br)Conductive nanofiber composites (CNCs) are promising as wearable strain sensors (WSSs) due to their unique porous structure and thus good breathability, flexibility, skin affinity, and so forth. It still remains a great challenge to develop flexible and stretchable CNCs for high performance WSSs that possess a high sensitivity, large working strain and can also be applied in various harsh conditions such as extremely cold and corrosive environment.

Abstract(#br)Superhydrophobic nanofibrous membranes have attracted tremendous attention to deal with some environmental problems like oil leakage and wastewater treatment; however, their poor durability, recyclability and stability limit their broad applications in the complex and harsh water treatment. Here, we prepared a superhydrophobic, anti-ultraviolet, durable and stretchable nanofiber composite membrane. TiO 2 nanoparticles were anchored onto the thermal plastic polyurethane (PU) nanofiber surface by ultrasonication, followed by polydimethylsiloxane (PDMS) modification.

Abstract(#br)Superhydrophobic polymer nanocomposite coatings based on polydimethylsiloxane (PDMS) and silica nanoparticles were fabricated on the surface of cotton fabrics via a dip-coating technique. The major aim was to illuminate the effect of a proper curing agent on the hydrophobicity of PDMS-based coating on the fabric surface. Employing different ratios of polymer and nanoparticles in the absence/presence of a curing agent resulted in the optimum formulation with enhanced chemical and mechanical durability.

Abstract(#br)Versatile composite materials integrating extreme water repellency with a series of characteristics have been seen as potential competitors for innovative applications. In this work, the author designs a three-dimensional superhydrophobic composite material (TSCM) featuring robustness and repairability by utilizing organic polymer components, polydimethylsiloxane (PDMS), and epoxy acrylate (EPA) and inorganic component, silica particle (SiO 2 ).

三维( 3D )微结构阵列( MSAs )通过提供超疏水表面、细胞相互作用的形貌、光学衍射等，在材料科学和生物医学应用中得到了广泛的应用。这些特性可以通过微结构形状、尺寸、锥度和长径比的工程来调节。然而，目前的制作方法往往过于复杂、昂贵或低吞吐量。这里，我们提出了一种利用双曝光光刻( DEL )和软光刻技术制备锥形3D MSAs的低成本方法。DEL用条状图案的薄膜掩模曝光SU-8光刻胶两次。掩膜在曝光之间( 90°或45° )重新定向，形成一个双曝光区域的阵列。两个曝光的强度分布重叠并在未曝光区域创建了一组3D过切的微口袋。这些微口袋在聚二甲基硅氧烷( PDMS )中被复制成DEL- MSAs。DEL- MSA的形状和尺寸通过改变DEL参数(如曝光能量、曝光间等待时间和光罩重新定向角度)来调节。此外，我们还对DEL- MSAs的各种性能进行了表征，并研究了其形状和尺寸的影响。与普通PDMS表面相比，所有DEL- MSA均表现出光学衍射能力，疏水性增强。疏水性和衍射角可根据MSA的形状和长径比进行调节。在所制备的五个MSA中，两个最高的DEL- MSA表现出超疏水性(接触角\u003e 150° )。此外，这些最高的结构还显示了模式蛋白(分辨率为6 - 7μm )和哺乳动物细胞，分别通过微接触印刷和直接培养。

尽管已有的努力，但要制备持久的超疏水表面，开发一种多用途、少伤害的方法是困难的。这里提出了一种温和富水的方法来获得无氟鲁棒超疏水材料，该方法是利用聚二甲基硅氧烷( PDMS )和二氧化钛( TiO2 )的复合溶液来减少有机溶剂的使用量。优化后的PDMS溶液/ TiO2水溶胶质量比( 2∶8 )，涂层棉织物的水接触角( WCA )为156.9°，脱落角为6.8°，得到的超疏水棉织物( SCF )在各种苛刻条件下也表现良好。此外，SCF不仅表现出优异的抗沾污能力，而且由于其光催化活性，在紫外光照射下能够降解有机污染物。更为重要的是，SCF可反复用于油水分离和净水，且超疏水性能无明显损失，为其在环境保护领域的应用提供了前景。该复合涂层可应用于PET织物、非织造布和海绵等不同基材上，赋予其表面超疏水性能。总体而言，我们的工作为制备多功能超疏水织物提供了一种简便、省时、少伤害的方法，在自清洁、户外和水处理应用方面具有显著的优势。

摘要( # br )超疏水薄膜在应用中的最大障碍之一是其较差的机械阻力。本研究将粗糙电沉积的SiO2 ( E-SiO2 )薄膜与表面能较低的耐用聚二甲基硅氧烷( PDMS )聚合物结合，在温和钢( MS )上构建了用于腐蚀防护的鲁棒超疏水SiO2薄膜。结果表明，PDMS含量对最终薄膜的微观形貌、润湿性、粗糙度和耐磨性有较大影响。EIS测试结果表明，在3.5 wt . % NaCl溶液中，所制备的超疏水E-SiO2 / PDMS薄膜对MS基体具有高达99.99 %的缓蚀效率。