Towards Bioinspired Superhydrophobic Poly(Lactic Acid) Surface Using Dip-Coating in Xylene/Titanium Dioxide Suspension

IF 2.6 4区 综合性期刊 Q2 MULTIDISCIPLINARY SCIENCES
Rui Yu, Weiqiang Song, Yin Zhang, Zhenyu Guo, Zidong Guo, Wei Miao, Wenxi Cheng
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Abstract

Poly(lactic acid) (PLA) was injected into test sheets and then dipped in a suspension of xylene and trimethylol propyl silane (95/5) containing titanium dioxide (TiO2) nanoparticles (NPs) at 65 and 85 °C for 3, 7, 10 and 15 s. TiO2 NPs aggregates coated the sheet surfaces after dipping. The camera photos and the static water contact angle (WCA) showed that the dip-coating transformed all the hydrophilic surfaces into hydrophobicity, and especially that the sheet with retention of 85 °C and 7 s exhibited superhydrophobicity, while the water droplets on the 65 °C sheets were in pinning state. The water droplets rolled off the superhydrophobic surface at tilt angles below 3°, showing self-cleaning. The retention period of 7 s was suitable, as it achieved the highest surface hydrophobicity regardless the retention temperature. The images of scanning electron microscope (SEM) and optical microscopes demonstrated the deposition of TiO2 NPs aggregates on the sheet surface and the formation of the porous structure on the surface. The combination of the aggregates with nanoscale protrusions and the pores with nanoscale pore walls constituted a hierarchical structure. The retention temperature of 65 °C made the pores shallow and wide, and the TiO2 concentration of 2% instead of 1% caused the excessive TiO2 NPs aggregates to cover the PLA substrate, reducing the WCA. The wetting models of water droplets on the surfaces of the 65 and 85 °C sticks were classified as Wenzel and Cassie states, respectively.

利用二甲苯/二氧化钛悬浮液中的浸渍涂层实现生物启发的超疏水聚乳酸表面
将聚乳酸(PLA)注入测试片材,然后将其浸入含有二氧化钛(TiO2)纳米颗粒(NPs)的二甲苯和三羟甲基丙基硅烷(95/5)悬浮液中,温度分别为 65 ℃ 和 85 ℃,时间分别为 3、7、10 和 15 秒。相机照片和静态水接触角(WCA)显示,浸涂将所有亲水表面转化为疏水表面,尤其是保持温度为 85 ℃、时间为 7 秒的片材表现出超疏水性,而 65 ℃ 片材上的水滴则处于钉牢状态。在倾斜角低于 3° 时,水滴从超疏水表面滚落,显示出自清洁性。7 秒的停留时间是合适的,因为无论停留温度如何,它都能达到最高的表面疏水性。扫描电子显微镜(SEM)和光学显微镜的图像显示,TiO2 NPs 聚集体沉积在薄片表面,并在表面形成多孔结构。具有纳米级突起的聚集体和具有纳米级孔壁的孔隙结合在一起,构成了分层结构。65 °C的保留温度使孔隙变浅变宽,TiO2浓度由1%变为2%,导致过多的TiO2 NPs聚集体覆盖聚乳酸基底,降低了WCA。水滴在 65 ℃ 和 85 ℃ 晶棒表面的润湿模型分别被归类为 Wenzel 状态和 Cassie 状态。
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来源期刊
Arabian Journal for Science and Engineering
Arabian Journal for Science and Engineering MULTIDISCIPLINARY SCIENCES-
CiteScore
5.70
自引率
3.40%
发文量
993
期刊介绍: King Fahd University of Petroleum & Minerals (KFUPM) partnered with Springer to publish the Arabian Journal for Science and Engineering (AJSE). AJSE, which has been published by KFUPM since 1975, is a recognized national, regional and international journal that provides a great opportunity for the dissemination of research advances from the Kingdom of Saudi Arabia, MENA and the world.
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