Department of Mechanical Engineering, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
ACS Appl Mater Interfaces. 2015 Sep 16;7(36):20100-10. doi: 10.1021/acsami.5b05233. Epub 2015 Sep 4.
This work describes a nanoparticle coating method to produce durable antiwetting polyester fabric. Electrophoretic deposition is used for fast modification of polyester fabric with silica nanoparticles embedded in polymeric networks for high durability coatings. Typically, electrophoretic deposition (EPD) is utilized on electrically conductive substrates due to its dependence on an applied electrical field. EPD on nonconductive materials has been attempted but are limited by weak adhesion, cracks, and other irregularities. To resolve these issues, we coat polyester fabric with thin polymer layers using electrostatic self-assembly (layer-by-layer self-assembly). Next, silica nanoparticles are uniformly dispersed on the polymer layers. Finally, polymerically stabilized silica nanoparticles are deposited by EPD on the fabric, followed by heat treatment. The modified fabric shows high static contact angle and low contact angle hysteresis, while keeping its original color, flexibility, and air permeability. During a skin fiction resistance test, the hydrophobicity of the coating layer was maintained over 500 h. Furthermore, we also show that this approach facilitates patterned regions of wettability by modifying the electric field in EPD.
这项工作描述了一种纳米粒子涂层方法，用于生产耐用的拒水聚酯织物。电泳沉积用于快速修饰聚酯织物，将嵌入聚合物网络中的二氧化硅纳米粒子用于高耐久性涂层。通常，由于依赖于施加的电场，电泳沉积 (EPD) 用于导电基底。已经尝试在非导电材料上进行 EPD，但受到弱附着力、裂缝和其他不规则性的限制。为了解决这些问题，我们使用静电自组装（层层自组装）在聚酯织物上涂覆薄聚合物层。接下来，将二氧化硅纳米粒子均匀分散在聚合物层上。最后，通过 EPD 将聚合物稳定的二氧化硅纳米粒子沉积在织物上，然后进行热处理。改性后的织物表现出高静态接触角和低接触角滞后，同时保持其原始颜色、柔韧性和透气性。在皮肤摩擦阻力测试中，涂层的疏水性在 500 小时以上得以保持。此外，我们还通过修改 EPD 中的电场来展示这种方法如何促进润湿性的图案化区域。
