Research On The Microstructure And Performance Of Glass Surface

Wettability is an inherent property of solid surface,and superhydrophobicity is a special phenomenon of wettability.When the water contact angle of surface is greater than 150°,sliding angle is less than 10°,the surface can be called as superhydrophobic surface.Although superhydrophobicity has been studied since the mid-1930s,interest in this phenomenon have grown substantially in the past few years due to recent recognition of its potential applications in various areas.In this article,we create the proper microstlucture on the surface of glass,in order to change their wettability and obtain superhydrophobic surface.Meanwhile,the usability was investigated.Moreover,the microstructure of glass was copied by PTFE,and the superhydrophobic PTFE film was obtained The main research contents are listed as follows:(1)By ammonium hydroxide hydrothermal method,the glass,was treated at lower temperature within shorter time,obtain nanostructure on its surface.With the change of treatment conditions,the surface morphology and the thickness of etching layer are changing regularly.When the surface is filled with nanoflakes,the glass will present superhydrophilicity.After modified by hexadecyltrimethoxysilane,the glass turns from hydrophilic to hydrophobic and shows the rose petals effect.Due to the change of surface morphology,the refraction index will change and make the glass transmittance increase.The results show that surface transmittance reach to the maximum(98%)when the glass was treated at 100? for 4 h with 2.5 mol/L concentration,and the maximal increase of transmittance is 7.4%.Moreover,the results also show that the nanoflake structures induce the glass has good properties of self-cleaning,anti-dust and anti-fogging.Through the study of the stability of glass,we found that the glass with nanostructure possess good stability,including mechanical stability,thermal stability and alkaline environment stability.(2)The glass was treated by ammonium hydroxide hydrothermal method at higher temperature for more than 7 h,and the dandelion-like pellets structure,which combines with nanoflakes form micro-nano dual structure,was appeared on the surface.The surface presents superhydrophilicity before modifying with low surface energy materials,and water droplet of 10 ? L could completely spread out within 8 ms.After modifying with low surface energy materials,the surface presents superhydrophobicity,and the contact angle reach to 158° and sliding angle is as low as 2°.Synthesizes all morphologies of glass treated below 200? by ammonium hydroxide hydrothermal method,the mechanism of construct of morphology was investigate completely,and the formation of dandelion-like pellets come forward with deposition and regrowth.Meantime,we have clarified the truth of surface morphology formation.The results show that the formation of surface morphology by hydrothermal method could be divided into four step:etching step,cracking step and regrowth step.And the dandelion-like pellets which is important to superhydrophobicity is formed by deposition and regrowth.Otherwise,the superhydrophobic PTFE surface was obtained by copying the microstructure of glass template.The results show that the PTFE films have good wear properties,and have the feasibility of mass production.