Department of Mechanical Engineering, University of Texas at Dallas, 800 W. Campbell Rd., Richardson, TX 75080, United States.
Department of Electrical Engineering, University of Texas at Dallas, 800 W. Campbell Rd., Richardson, TX 75080, United States.
J Colloid Interface Sci. 2017 Apr 15;492:33-40. doi: 10.1016/j.jcis.2016.12.061. Epub 2016 Dec 28.
In this paper we investigate the feasibility of using a cost-effective fabrication method based on sandblasting, chemical etching and spray coating processes, to render common surfaces to be non-wettable by Galinstan®. Although Galinstan® is a non-toxic liquid metal alternative to mercury, the viscoelastic and extremely wetting characteristics of Galinstan® have been the major bottleneck limiting the wide applicability of the gallium-based liquid metal. This paper tries to accomplish non-wettability to Galinstan® by combining surface texture and chemistry with the unique property of Galinstan®, that is, its high surface tension and yield strength that prevent the penetration of the liquid metal into surface asperities. Fabricated surfaces resemble traditional superhydrophobic (water-repellent) surfaces, and exhibit a superior non-wettability to Galinstan® as quantified by high static and dynamic contact angles, small hysteresis, as well as impact resistance. Reported fabrication method based on sandblasting, etching and spray coating is easily applicable to various surfaces ranging from metals, ceramics, to plastics and is scalable to large surfaces.
在本文中，我们研究了一种基于喷砂、化学蚀刻和喷涂工艺的低成本制造方法的可行性，该方法可以使普通表面对 Galinstan®不具有润湿性。尽管 Galinstan®是一种无毒的液态金属替代汞，但 Galinstan®的粘弹性和极强的润湿性一直是限制基于镓的液态金属广泛应用的主要瓶颈。本文试图通过结合表面纹理和化学特性以及 Galinstan®的独特特性来实现 Galinstan®的不润湿性，即 Galinstan®的高表面张力和屈服强度可防止液态金属渗透到表面凸起中。制造的表面类似于传统的超疏水（拒水）表面，并且通过高静态和动态接触角、小滞后以及耐冲击性来量化，表现出对 Galinstan®的优异不润湿性。所报道的基于喷砂、蚀刻和喷涂的制造方法易于应用于从金属、陶瓷到塑料等各种表面，并且可以扩展到大表面。
