Preparation Of Superhydrophobic Surfaces With Uv-shielding Property By Coating Fibers With Zno/siO₂Core/shell Structures

Superhydrophobic textile surfaces with UV-shielding property are significantfor outdoor protection due to their excellent water repellency, self-cleaningproperty and UV-shielding property. They are greatly appreciated forapplications such as in technical, industrial, medical, and military end-uses, aswell as for everyday life uses, such as beach umbrellas, shade shelters, tents,garments, and advertisement materials. However, there are few reports on thefabrication of superhydrophobic textile surfaces with UV-shielding properties.This thesis reviewed the research on superhydrophobic surfaces and the work onfabrication of textiles with UV-shielding property, and presents the main researchcontents and results about fabrication of superhydrophobic textile surfaces withUV-shielding property, which are listed as follows:ZnO/SiO₂core/shell particles were fabricated and coated on poly（ethyleneterephthalate）（PET） textiles, followed by hydrophobization withhexadecyltrimethoxysilane, to fabricate superhydrophobic surfaces withUV-shielding property. Transmission electron microscopy and ζ potentialanalysis were employed to evidence the fabrication of ZnO/SiO₂core/shellparticles. Scanning electron microscopy and ultraviolet–visiblespectrophotometry analysis were conducted to investigate the properties of thetextiles. The formation mechanism of ZnO/SiO₂core/shell particles was studied.The prohibition effects of the photoactivity of ZnO by SiO₂shell on thesuperhydrophobicity of the textiles, and the loading effects of ZnO on theUV-shielding property were investigated, with the aim to obtainsuperhydrophobic textiles with UV-shielding property.ZnO nanostructures with different morphologies were grown on PET fibers bya hydrothermal process. Then the ZnO nanorod decorated fibers were layer-by-layer coated with silica forming ZnO/SiO₂core/shell structures on thetextiles, and hydrophobized with hexadecyltrimethoxysilane for getting textileswith superhydrophobicity surfaces and UV-shielding property. Scanning electronmicroscopy and ultraviolet–visible spectrophotometry were conducted toinvestigate the properties of the modified textiles. The formation mechanism ofZnO nanostructures on fibers and their effect on the UV-shielding property werestudied, with the aim to obtain superhydrophobic textiles with goodUV-shielding property by a hydrothermal process of ZnO.Direct Turquoise Blue5B and Reactive Brilliant Red K-2BP were used as thesubstances for photocatalytic degradation test to explore the photoactivity ofZnO grown on textiles. The results showed that the photodegradation ability ofZnO depends on the dyes used. This experiment further proves the necessity tocoat SiO₂on ZnO to prohibit the photoactivity of ZnO in the above mentionedwork, and presents a new way to treat wastewater containing dyes by ZnO grownon textiles.