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Super-hydrophobic coatings on cotton fabrics using sol–gel technique by spray
Journal of Sol-Gel Science and Technology ( IF 2.5 ) Pub Date : 2020-05-17 , DOI: 10.1007/s10971-020-05307-x
Melina Espanhol-Soares , Larissa Costa , Milady Renata Apolinário Silva , Flávio Soares Silva , Larissa Mayra Silva Ribeiro , Rossano Gimenes

In this work, hydrophobic surfaces on cotton fabrics were obtained using a sol–gel technique to produce coatings applied using a spray of precursor solution followed by drying and heat treatments. Different types of treatments using the sol–gel process were performed in order to assess the influence on fabric hydrophobicity, with alteration of parameters including the concentrations of citric acid and tetraethyl orthosilicate (TEOS), the number of sprays, and curing of the fabric after obtaining the hydrophobic coating. The absorption of water into material samples were tested according to the AATCC test method 79. Scanning electron microscopy, contact angle, and Fourier-transform infrared spectroscopy (FT-IR) analysis were also studied. Excellent results were obtained for the contact angle (>150°), hence characterizing all the treatments as super-hydrophobic. FT-IR analyses revealed differences according to the citric acid concentration employed. The best results were obtained for samples treated using a higher concentration of citric acid and spraying the sol–gel solution twice. Mathematical models of the contact angle and the time for water absorption by the fabric treated with TEOS and citric acid showed good agreement with the experimental data.



中文翻译:

溶胶-凝胶技术喷涂棉织物上的超疏水涂料

在这项工作中,使用溶胶-凝胶技术在棉织物上获得疏水表面,以生产使用前体溶液进行喷涂,然后进行干燥和热处理的涂层。为了评估对织物疏水性的影响,使用了溶胶-凝胶工艺进行了不同类型的处理,并更改了参数,包括柠檬酸和原硅酸四乙酯(TEOS)的浓度,喷雾次数以及织物在固化后的固化获得疏水涂层。根据AATCC测试方法79测试了水在材料样品中的吸收。还研究了扫描电子显微镜,接触角和傅立叶变换红外光谱(FT-IR)分析。接触角(> 150°)获得了极好的结果,因此,所有处理都具有超疏水性。FT-IR分析揭示了根据所用柠檬酸浓度的不同。使用较高浓度的柠檬酸并两次喷涂溶胶-凝胶溶液处理的样品可获得最佳结果。TEOS和柠檬酸处理过的织物的接触角和吸水时间的数学模型与实验数据吻合良好。

更新日期:2020-05-17
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