Abstract Viscoelastic materials having high loss factor are receiving enormous importance in damping applications. In this report, several layers of graphene oxide (GO) stacked thick membranes are tuned for their viscoelastic properties, and studied the role of intercalated loosely bound water in deciding their damping ratios (tan δ, ratio of loss modulus to storage modulus). The loosely bound water present inside GO membranes, where the membranes are developed using flow assisted filtration, is removed by ethanol and diethyl ether based room temperature solvent drying technique to study the dynamic mechanical behaviour of the resultant membranes. A huge enhancement in tan δ (>160%) is observed in water removed GO membranes without compromising on its storage modulus, indicating the critical role of water in GO's viscoelastic properties. The in situ tan δ variation of GO paper immersed in ethanol bath is also studied using submersible clamp experiments in dynamic mechanical analyser, where the GO paper has undergone a dewetting phenomenon. These studies show the tunability in the viscoelastic properties of GO macroscopic structures by solvent assisted room temperature intercalation/de-intercalation techniques.

中文翻译：

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增强氧化石墨烯膜的粘弹性

摘要 具有高损耗因数的粘弹性材料在阻尼应用中越来越重要。在这份报告中，几层氧化石墨烯 (GO) 堆叠的厚膜针对其粘弹性特性进行了调整，并研究了嵌入的松散结合水在决定其阻尼比（tanδ，损耗模量与储能模量的比值）中的作用。GO 膜内存在的松散结合水，其中使用流动辅助过滤开发膜，通过基于乙醇和乙醚的室温溶剂干燥技术去除，以研究所得膜的动态机械性能。在去除水的 GO 膜中观察到 tan δ 的巨大增强（>160%），而不会影响其储能模量，表明水在 GO 的粘弹性中的关键作用。还使用动态力学分析仪中的潜水夹具实验研究了浸入乙醇浴中的 GO 纸的原位 tan δ 变化，其中 GO 纸经历了去湿现象。这些研究表明，通过溶剂辅助的室温嵌入/脱嵌技术，GO 宏观结构的粘弹性能具有可调性。