Wettability and Surface Free Energy of Graphene Films

被引：906
作者：
Wang, Shiren [1 ]
Zhang, Yue [1 ]
Abidi, Noureddine [2 ]
Cabrales, Luis [2 ]
机构：
[1] Texas Tech Univ, Dept Ind Engn, Lubbock, TX 79409 USA
[2] Texas Tech Univ, Fiber & Biopolymer Inst, Lubbock, TX 79409 USA
来源：
LANGMUIR | 2009年 / 25卷 / 18期
关键词：
THERMAL-CONDUCTIVITY; CARBON NANOTUBES; TRANSPARENT; ELECTRODES;
D O I：
10.1021/la901402f
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Graphene sheets were produced through chemical exfoliation of natural graphite flake and hydrazine conversion. Subsequently, graphene sheets were assembled into a thin film, and microscale liquid droplets were placed onto the film surface for measurement of wettability and contact angle. It is found that a graphene oxide sheet is hydrophilic and a graphene sheet is hydrophobic. Isolated graphene layers seem more difficult to wet in comparison to graphite. and low adhesion work was found in the graphene-liquid interface. Approximation of solid-liquid interfacial energy with the equation of state theory was applied to determine the graphene surface energy. The results indicate that surface energy of graphene and graphene oxide is 46.7 and 62.1 mJ/m(2), respectively, while natural graphite flake shows a surface free energy of 54.8 mJ/m(2) at room temperature. These results will provide valuable guidance for the design and manufacturing of graphene-based biomaterials, medical instruments, structural composites, electronics, and renewable energy devices.
引用
收藏
页码：11078 / 11081
页数：4
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