Your parcel arrives, it's a rectangular transparent glass. Nope, it's not huge, probably just about the size of your palm. You remove the plastic seal to expose the sticky side. Carefully you press it down, sticking it on your phone. You would be lucky if no air bubble is trapped on the first try.
Unlike using screen protectors, which we can simply try again till all bubbles are gone, trapping of air is devastating for casting, coating, painting, and printing industries, or those intolerant of water entry noise. In these industries, reducing the ambient pressure or modifying the solid surfaces are ways to remove the interfering air. However, these approaches have limitations.
In the article below, written by our NTU MAE Dr. Quoc Vo and Associate Prof. Tuan Tran, a 'divide and conquer' approach is presented to split any trapped air gap into tunnels and subsequently squeeze air out from the tunnels against its viscous resistance.
This article is titled 'Mediation of lubricated air ﬁlms using spatially periodic dielectrophoretic effect', find it from the link below:
Photo by: Alberto Bianchini on Unsplashed