Dynamic intermolecular interactions through hydrogen bonding of water promote heat conduction in hydrogels,Materials Horizons

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Dynamic intermolecular interactions through hydrogen bonding of water promote heat conduction in hydrogels
Materials Horizons ( IF 12.2 ) Pub Date : 2020-08-10 , DOI: 10.1039/d0mh00735h
Jiawei Zhou _{1,

2,

3} , Shaoting Lin _{1,

2,

3} , Hongxia Zeng _{1,

2,

3} , Ji Liu _{1,

2,

3} , Buxuan Li _{1,

2,

3} , Yanfei Xu _{1,

2,

3} , Xuanhe Zhao _{1,

2,

3,

4,

5} , Gang Chen _{1,

2,

3}

Affiliation

Heat-conducting polymers provide a new opportunity to tackle thermal management challenges in advanced technologies such as wearable electronics and soft robotics. One strategy to enhance heat conduction in amorphous polymers has been tuning their intermolecular interactions. These intermolecular forces are often static in nature as the participating molecules are anchored on the polymer chains. In this work, using hydrogel as a model system, we demonstrate how dynamic intermolecular forces, which break and re-form constantly, can also enhance thermal transport. Utilizing calorimetric and spectroscopic measurements, we show that this arises from the hydrogen bonds formed between water and nearby polymer chains, which enhances the inter-chain heat transfer efficiency. This mechanism may potentially allow the design of heat-conducting polymers with self-healing or adaptability functionalities.

中文翻译：

通过水的氢键动态分子间相互作用促进水凝胶中的热传导

导热聚合物为解决诸如可穿戴电子设备和软机器人等先进技术中的热管理挑战提供了新的机会。增强无定形聚合物中导热的一种策略是调节它们的分子间相互作用。由于参与的分子锚定在聚合物链上，因此这些分子间力通常是静态的。在这项工作中，使用水凝胶作为模型系统，我们演示了不断断裂和重新形成的动态分子间力如何增强热传递。利用量热法和分光光度法测量，我们表明这是由水和附近的聚合物链之间形成的氢键引起的，从而提高了链间的传热效率。

更新日期：2020-08-28

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