[2017-Vol.14-Issue 3]Biomimetic Hydrophobic Surfaces with Low or High Adhesion Based on Poly(vinyl alcohol) and SiO2 Nanoparticles
Time: 2017-09-12 16:17  Click:44

Journal of Bionic Engineering

Volume 14, Issue 3, July 2017, Pages 476-485
Qian Wang1 , Zhao Dong1 , Xiaoxia Yan1 , Yanjiao Chang1 , Lili Ren1,2, Jiang Zhou1
1. Key Laboratory of Bionic Engineering (Ministry of Education, China), College of Biological and Agricultural Engineering, Jilin University, Changchun 130022, China
2. College of Chemistry, Jilin University, Changchun 130022, China
 

Abstract

Superhydrophobic surfaces are often found in nature, such as plant leaves and insect wings. Inspired by superhydrophobic phenomenon of the rose petals and the lotus leaves, biomimetic hydrophobic surfaces with high or low adhesion were prepared with a facile drop-coating approach in this paper. Poly(vinyl alcohol) (PVA) was used as adhesive and SiO2 nanoparticles were used to fabricate surface micro-structure. Stearic acid or dodecafluoroheptyl-propyl-trimethoxysilane (DFTMS) were used as low surface energy materials to modify the prepared PVA/SiO2 coating surfaces. The effects of size of SiO2 nanoparticles, concentration of SiO2 nanoparticle suspensions and the modifications on the wettability of the surface were investigated. The morphology of the PVA/SiO2 coating surfaces was observed by using scanning electron microscope. Water contact angle of the obtained superhydrophilic surface could reach to 3°. Stearic acid modified PVA/SiO2 coating surfaces showed hydrophobicity with high adhesion. By mixing the SiO2nanoparticles with sizes of 40 nm and 200 nm and modifying with DFTMS, water contact angle of the obtained coating surface could be up to 155° and slide angle was only 5°. This work provides a facile and useful method to control surface wettability through changing the roughness and chemical composition of a surface.

Keywords

biomimetic surface;
PVA/SiO2 coating;
hydrophobicity;
high adhesion;
low adhesion
 
 


Full text is available at 
http://www.sciencedirect.com/science/article/pii/S1672652916604134
 

 

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