石墨烯纳米凝胶的智能粘弹性及自修复特性
Smart viscoelastic and self-healing characteristics of graphene nano-gels
摘要：
已经采用简单的聚合方法合成了容易合成的基于纳米石墨烯和聚乙二醇的稳定凝胶，并且已经进行了详尽的流变学和粘弹性表征以理解这种复杂凝胶系统的性质。凝胶表现出剪切稀化响应，具有显著的屈服应力值，这表明其中石墨烯纳米片与聚合物链插层并形成伪弹簧阻尼器网络的微结构。对凝胶的触变行为的实验表明，G纳米片的存在导致能够承受严重的冲击剪切的极大增强的结构稳定性。从线性和非线性粘弹性制度的振幅和频率扫描分析中揭示了关于G纳米片与聚合物链的局部相互作用的进一步信息。记录了大量增强的交叉振幅值，并记录了几种智能效应，例如在不断增加的强迫频率下增强的弹性行为。在给定的频率范围内，观察到凝胶的弹性行为的结构共振引起的破坏，并从数学上证明了共振的命题。据观察，在此共振带宽后，凝胶能够自我愈合并恢复其原始弹性行为，而无需任何外部干预。更详细的信息的粘弹性性质的凝胶已获得蠕变和恢复符合性测试和理由的弹簧阻尼器的微观结构已经获得。智能功能，如增强的应力松弛行为与应变增加已被观察到，同样的解释的基础上提出的微观结构。
英文摘要：
Readily synthesizable nano-graphene and poly ethylene glycol based stable gels have been synthesized employing an easy refluxing method and exhaustive rheological and viscoelastic characterizations have been performed to understand the nature of such complex gel systems. The gels exhibit shear thinning response with pronounced yield stress values which is indicative of a microstructure where the graphene nanoflakes intercalate with the polymer chains and form a pseudo spring damper network. Experimentations on the thixotropic behavior of the gels indicate that the presence of the G nanoflakes leads to immensely augmented structural stability capable of withstanding severe impact shears. Further information about the localized interactions of the G nanoflakes with the polymer chains is revealed from the amplitude and frequency sweep analyses in both linear and nonlinear viscoelastic regimes. Massively enhanced cross over amplitude values are recorded and several smart effects such as enhanced elastic behavior at increasing forcing frequencies are registered. Structural resonance induced disruption of the elastic behavior is observed for the gels for a given range of frequency and the proposition of resonance has been justified mathematically. It is observed that post this resonance bandwidth, the gels are able to self-heal and regain their original elastic behavior back without any external intervention. More detailed information on the viscoelastic nature of the gels has been obtained from creep and recovery compliance tests and justifications for the spring damper microstructure has been obtained. Smart features such as enhanced stress relaxation behavior with increasing strain have been observed and the same explained based on the proposed microstructure.
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