物理化学学报 >> 2017, Vol. 33 >> Issue (9): 1846-1854.doi: 10.3866/PKU.WHXB201705051

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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

张晨辉,赵欣,雷津美,马悦,杜凤沛*()   

  • 收稿日期:2017-03-23 发布日期:2017-07-05
  • 通讯作者: 杜凤沛 E-mail:dufp@cau.edu.cn
  • 基金资助:
    国家自然科学基金(21573283)

Wettability of Triton X-100 on Wheat (Triticum aestivum) Leaf Surfaces with Respect to Developmental Changes

Chen-Hui ZHANG,Xin ZHAO,Jin-Mei LEI,Yue MA,Feng-Pei DU*()   

  • Received:2017-03-23 Published:2017-07-05
  • Contact: Feng-Pei DU E-mail:dufp@cau.edu.cn
  • Supported by:
    The project was supported by the National Natural Science Foundation of China(21573283)

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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。

关键词: 非离子表面活性剂, 小麦叶片, 固体表观表面自由能, 吸附, 润湿状态

Abstract:

In this research, the wetting behavior of nonionic surfactant Triton X-100 on wheat leaf surfaces at different developmental stages has been investigated based on the surface free energy, contact angle, adhesion tension, and liquid-solid interfacial tension. The results show that the contact angle remains constant with low adsorption at the liquid-air (ΓLV) and liquid-solid (Γ'SL) interfaces at low concentration, and the wetting state is in the Cassie-Baxter state. On increasing the concentration, the contact angle decreases sharply and the ratio of Γ'SL/ΓLV becomes more than 1. Meanwhile, the droplet overcomes the pinning effect to displace the air among three-dimensional wax layers and is in the Wenzel state. When the concentration becomes over critical micelle concentration (CMC), a saturated adsorption film forms at the interfaces, and the hemiwicking process occurs among micro/nano structures because of the capillary effect, then the contact angle remains constant.

Key words: Nonionic surfactant, Wheat leaf surfaces, Solid apparent surface free energy, Adsorption, Wetting state