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利用壳聚糖和亲水性SiO2纳米颗粒,通过浸渍提拉法在玻璃表面制备了水下超疏油壳聚糖-SiO2复合膜.采用扫描电镜、原子力显微镜和接触角仪,研究了组分配比、浸泡时间对复合膜表面形貌、粗糙度、水下油滴接触角(OCA)和滚动角(SA)的影响.结果表明,随着亲水性SiO2含量的增加,复合膜表面聚集的亲水性SiO2纳米颗粒增多,水下疏油性提高;随着浸泡时间延长,复合膜的水下油滴OCA逐渐增大,浸泡168 h时略有减小,SA也受到浸泡时间的影响.当SiO2乙醇悬浮液和壳聚糖溶液的体积比为1∶10和1∶5时,复合膜呈现疏油性;当SiO2乙醇悬浮液和壳聚糖溶液的体积比大于等于1∶2时,复合膜的水下油滴接触角OCA大于150°.当SiO2乙醇悬浮液和壳聚糖溶液的体积比为1∶1、浸泡24 h时,复合膜水下疏油性最好,水下油滴接触角OCA达157.8°,滚动角SA为1.9°.复合膜可用于水下油滴的操控,实现了溴(Br2)和苯乙烯在油滴微反应器中的加成反应.
Using chitosan and hydrophilic SiO2 nano-particles, the underwater super oleophobic chitosan-SiO2 composite membrane was prepared on glass by dipping and pulling method. The effect of immersion time on the morphology, roughness, OCA and SA of the composite film was investigated.The results showed that with the increase of hydrophilic SiO2 content, With the increase of immersion time, OCA of submerged oil droplets of composite membrane increased gradually, slightly decreased after soaking for 168 h, and SA was also affected by soaking time. When the volume ratio of SiO 2 ethanol to chitosan solution is 1:10 and 1:5, the composite membrane is oleophobic. When the volume ratio of SiO 2 ethanol solution to chitosan solution is greater than or equal to 1: 2, Of the OCA of the underwater oil droplets is more than 150. When the volume ratio of SiO2 ethanol suspension to chitosan solution is 1: 1, soaking for 24 h, the underwater membrane oleophobicity is the best, the contact angle of underwater oil droplets OCA of 157.8 °, SA of rolling angle of 1.9 °. The composite membrane can be used for underwater oil droplets manipulation, to achieve the bromine (Br2) And styrene addition reaction in the oil droplet microreactor.