非离子表面活性剂Triton X-100溶液在不同生长期小麦叶片表面的润湿行为

发布时间：2018-05-29 21:33

本文选题：非离子表面活性剂 + 小麦叶片　；参考：《物理化学学报》2017年09期

【摘要】：选择不同生长期小麦叶片,利用座滴法研究了非离子表面活性剂Triton X-100在小麦叶片表面接触角,考察浓度对接触角、粘附张力、固-液界面张力及润湿状态的影响。研究表明,在低浓度下,表面活性剂分子在气-液界面吸附量(ΓLV)和固-液界面吸附量(Γ'SL)相似,但吸附量较少形成了不饱和吸附层,接触角保持不变,其润湿状态为Cassie-Baxter状态;当浓度进一步增加,液滴突破叶片表面三维立体结构中存在的钉扎效应,取代空气层而处于Wenzel状态,接触角陡降,同时Γ'SL/ΓLV远大于1;当浓度超过临界胶束浓度(CMC)时,表面活性剂分子在气-液界面和固-液界面形成饱和吸附层,并产生毛细管效应,使溶液在小麦叶片三维立体结构中产生半渗透过程,此时接触角保持不变。
[Abstract]:The surface contact angle of Nonionic surfactant Triton X-100 on wheat leaves was studied by drop method in different growing stages. The effects of concentration on contact angle, adhesion tension, solid-liquid interfacial tension and wetting state were investigated. The results show that the adsorption amount of surfactant molecules at the gas-liquid interface (螕 LV) is similar to that at the solid-liquid interface (螕 -SLL) at low concentration, but the adsorption amount is less, and the contact angle remains constant, and the wetting state is Cassie-Baxter. When the concentration increases further, the droplet breaks through the pinning effect existing in the three-dimensional structure of the blade surface and is in the Wenzel state instead of the air layer, and the contact angle drops steeply, at the same time, the 螕 SLL / 螕 LV is far greater than 1, and when the concentration exceeds the critical micelle concentration, At the gas-liquid interface and the solid-liquid interface, the surfactant molecules form a saturated adsorption layer and produce a capillary effect, which results in the semi-permeation process of the solution in the three-dimensional structure of wheat leaves, at which the contact angle remains unchanged.
【作者单位】：中国农业大学理学院应用化学系;
【基金】：国家自然科学基金(21573283)资助项目~~
【分类号】：O647.5

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