Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (9): 1846-1854.doi: 10.3866/PKU.WHXB201705051

• ARTICLE • Previous Articles     Next Articles

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
  • Supported by:
    The project was supported by the National Natural Science Foundation of China(21573283)


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