镓基液态金属非润湿及不黏附玻璃表面的研究

Study on Gallium-based Liquid Metal Non-Wetting and Nonadhering Glass Surface

液态金属/玻璃非润湿、不黏附研究对于镓基液态金属盛放、回收以及流动运输具有重要意义。通过气氛保护熔炼法制备GaIn(20.5)Sn(13)液态金属,利用不同型号砂纸打磨及旋涂镀膜处理制备不同表面形貌的玻璃片,研究合金液滴在不同玻璃表面的润湿、黏附和滚动行为。利用扫描电子显微镜(SEM)、原子力显微镜(AFM)以及接触角测量仪分别对不同玻璃的表面形貌、表面粗糙度以及润湿行为进行了测试和表征,并在其表面进行了滚动测试。结果表明:粗糙化处理和镀膜处理均可降低合金液滴在玻璃表面的润湿性,提高合金液滴的流动性。随着表面粗糙度的增大,液滴在玻璃表面的接触角不断增大,当粗糙度为187.9nm时,表面接触角达到150.6°。将表面粗糙化与镀膜处理相结合,得到镓基液态金属非润湿、不黏附的玻璃表面,接触角最高可达160.4°,同时合金液滴在其表面的滚动角为15°,滚动滞后角为3°。

Study of non-wetting and non-adhesion of liquid metal/glass is of great significance for storage,recovery and mobile transportation of gallium based liquid metal.GaIn20.5Sn13 liquid metal was prepared by atmosphere protection melting method,and glass sheets with different surface morphologies were prepared by sanding and coating with different types of sandpaper,so as to study wetting and adhesion behavior of different glass surfaces.Scanning electron microscope(SEM),atomic force microscope(AFM)and contact angle measuring instrument were used to test and characterize surface morphology,surface roughness and wetting behavior of different glasses,and rolling angle was tested on surface.The results show that both roughening treatment and coating treatment can reduce wettability of alloy droplet on glass surface and improve fluidity of alloy droplet.Contact angle of droplets on surface of glass rises with increase of surface roughness,when roughness is 187.9 nm,surface contact angle is 150.6°.Combining surface roughness and coating treatment,gallium non-wetting liquid metal base and no adhesion of surface of glass are prepared,contact angle is up to 160.4°,roll angle of alloy droplet on surface of glass is 15°,and rolling lag angle is 3°.