An electron beam irradiation-assisted coating method for the regulation of hydrophilicity and hydrophobicity†

Industrial Chemistry & Materials Pub Date : 2024-05-06 DOI:10.1039/D4IM00015C

Haozhe Li, Keyan Sheng, Zhiyan Chen, Shuai Hao, Zijian Zhou, Zhenyi Zhang, Xinwen Liu, Mianzhi Xiong, Yanlong Gu and Jiang Huang

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Abstract

Developing a stable, reliable, and industrially compatible method to control hydrophobicity is crucial for separation, transportation, and the generation of special surfaces. An e-HMS-PDMS silica gel nanoparticle coating was prepared using a two-step electron beam irradiation (EBI) process, consisting of (i) grafting of two organic groups onto thiol-functionalized hollow mesoporous silica (HMS-SH) with 10 MeV EBI and (ii) curing of polydimethylsiloxane (PDMS) onto silicone rubber using the HMS hybrid materials prepared in step i as an additive with 200 keV EBI. The tuneable grafting of functional groups and the surface properties of the silica, which was embedded in the PDMS layer, allowed us to precisely control the hydrophilicity of the PDMS layer by means of altering the grafting gradient of the silica and the loading ratio of the monomers. A diverse range of vinyl-structured monomers can be used in this method, and the selection of suitable monomers is vital in determining the physical properties of the coating layer. The hydrophilicity of the coating can be linearly controlled within a specific range (50° to 155°) by using suitable monomers, allowing for the design of surfaces with specific hydrophilic and hydrophobic requirements.

Keywords: Electron beam irradiation; Nanoparticle composite coating; Hydrophilicity/hydrophobicity; Thiol-ene click reaction.

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电子束辐照辅助调节亲水和疏水涂层方法

开发一种稳定、可靠、与工业兼容的疏水性控制方法对于分离、运输和生成特殊表面至关重要。电子-HMS-PDMS硅胶纳米颗粒涂层的制备采用了两步电子束辐照（EBI）工艺，包括（i）用10 MeV EBI将两个有机基团接枝到硫醇官能化的中空介孔二氧化硅HMS-SH上；（ii）用200 keV EBI将聚二甲基硅氧烷（PDMS）固化到硅橡胶上，并将步骤i中制备的HMS混合材料作为添加剂。嵌入 PDMS 层的硅胶具有可调的接枝官能团及其表面特性，因此我们可以通过改变硅胶的接枝梯度和单体的负载率来精确控制 PDMS 层的亲水性。该方法可使用多种乙烯基结构单体，选择合适的单体对于确定涂层的物理性质至关重要。使用合适的单体可将涂层的亲水性线性控制在特定范围内（50° 至 155°），从而设计出具有特定亲水性和疏水性要求的表面。

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