Recovery of Nonwetting Characteristics by Surface Modification of Gallium-Based Liquid Metal Droplets Using Hydrochloric Acid Vapor

被引：251

作者：

Kim, Daeyoung ^{[1
]}

Thissen, Peter ^{[2
]}

Viner, Gloria ^{[3
]}

Lee, Dong-Weon ^{[4
]}

Choi, Wonjae ^{[3
]}

Chabal, Yves J. ^{[2
]}

Lee, Jeong-Bong ^{[1
]}

机构：

[1] Univ Texas Dallas, Dept Elect Engn, Richardson, TX 75080 USA

[2] Univ Texas Dallas, Dept Mat Sci & Engn, Richardson, TX 75080 USA

[3] Univ Texas Dallas, Dept Mech Engn, Richardson, TX 75080 USA

[4] Chonnam Natl Univ, Sch Mech Syst Engn, Kwangju 550757, South Korea

来源：

ACS APPLIED MATERIALS & INTERFACES | 2013年 / 5卷 / 01期

基金：

美国国家科学基金会;

关键词：

HCl vapor treatment; surface modification; gallium-based liquid metal alloy; nonwetting; Galinstan; RAY PHOTOELECTRON-SPECTROSCOPY; TENSION; INDIUM; GAAS; ALLOY;

D O I：

10.1021/am302357t

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The applicability of gallium-based liquid metal alloy has been limited by the oxidation problem. In this paper, we report a simple method to remove the oxide layer on the surface of such alloy to recover its nonwetting characteristics, using hydrochloric acid (HCl) vapor. Through the HCl vapor treatment, we successfully restored the nonwetting characteristics of the alloy and suppressed its viscoelasticity. We analyzed the change of surface chemistry before and after the HCl vapor treatment using X-ray photoelectron spectroscopy (XPS) and low-energy ion-scattering spectroscopy (LEIS). Results showed that the oxidized surface of the commercial gallium-based alloy Galinstan (Ga2O3 and Ga2O) was replaced with InCl3 and GaCl3 after the treatment. Surface tension and static contact angle on a Teflon-coated glass of the HCl-vapor-treated Galinstan were measured to be 523.8 mN/m and 152.5 degrees. A droplet bouncing test was successfully carried out to demonstrate the nonwetting characteristics of the HCl-vapor-treated Galinstan. Finally, the stability of the transformed surface of the HCl-vapor-treated Galinstan was investigated by measuring the contact angle and LEIS spectra after reoxidation in an ambient environment.

引用

页码：179 / 185

页数：7

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