TiO2／SiO2核壳结构微粒的合成及超疏水防紫外线功能织物的制备

以正硅酸乙酯为前驱体，采用溶胶-凝胶法在纳米TiO2表面包覆SiO2壳层，制备TiO2／SiO2核壳结构复合微粒，并将其负载在涤纶织物上，然后对织物进行疏水化处理，得到具有超疏水和防紫外线双重功能的织物．采用透射电子显微镜对复合微粒进行了表征；采用扫描电子显微镜对涤纶及处理后的涤纶织物的表面形貌进行了观察；采用视频光学接触角测量仪对涤纶织物表面的润湿性能进行测试；对织物超疏水性能的稳定性以及织物的紫外线防护性能进行了研究．结果表明：TiO2／SiO2复合微粒在纤维表面的负载不仅极大地提高了纤维表面的粗糙性，有利于超疏水表面的形成，并且由于TiO2的引入使织物获得了良好的紫外线防护性能；SiO2壳层对TiO2的包覆降低了TiO2的光催化作用，从而有效地提高了超疏水表面的紫外光照射稳定性．

Preparation of TiO2/SiO2 core-shell particles and their coating on fibers for superhydrophobic textiles with UV-shielding property

TiO2 particles were coated with SiO2 using tetraethyl orthosilicate as precursor by Sol-Gel to form TiO2/SiO2 core-shell particles. The as-obtained composite particles were loaded on the surface of poly（ethylene terephthalate） （PET） textiles via a process of dip-pad- dry, followed by hydrophobization to fabricate superhydrophobic textiles with UV-shielding property. The morphologies of the composite particles were characterized by transmission e- lectron microscopy. The morphologies of PET textiles were observed by using scanning elec- tron microscope, and the surface wetting property of PET textiles was measured by video optical contact angle system. The stability of the superhydrophobicity and the UV property of the textiless were also investigated. The results showed that loading of composite particles roughened the fibers to favour the realization of superhydrophobicity, and improved the UV- shielding property of the textiles due to the incorporation of TiO2. And importantly, the coating of SiO2 on TiO2 lowered the photoactivity of TiO2, thus improved the UV durability of the superhydrophobicity on the textiles.