Superlubricity Achieved with Mixtures of Acids and Glycerol

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• 作者：Jinjin Li ; Chenhui Zhang ; Liran Ma ; Yuhong Liu ; Jianbin Luo
• 刊名：Langmuir
• 出版年：2013
• 出版时间：January 8, 2013
• 年：2013
• 卷：29
• 期：1
• 页码：271-275
• 全文大小：285K
• 年卷期：v.29,no.1(January 8, 2013)
• ISSN：1520-5827

文摘

In this work, superlubricity between glass and Si₃N₄ surfaces lubricated by mixtures of acid solutions and glycerol solutions has been found by using a traditional tribometer. Ultralow friction coefficients of between 0.004 and 0.006 were obtained after a running-in period. Related experiments indicate that the hydrogen ions in the mixtures play an important role in achieving superlubricity. Moreover, the ultralow friction is also closely related to the pH value of the acid and the concentration of glycerol. According to these results, the possible superlubricity mechanism has been revealed, which is attributed to a fluid-hydrated water layer between the hydrogen-bonded networks of glycerol and water molecules on the positively charged surfaces.