自愈水凝胶
材料科学
热传导
热导率
生物相容性
聚丙烯酰胺
聚合物
数码产品
化学工程
复合材料
纳米技术
高分子化学
化学
物理化学
工程类
冶金
作者
Ni Tang,Zhan Peng,Rulei Guo,Meng An,Xiandong Chen,Xiaobo Li,Nuo Yang,Jianfeng Zang
出处
期刊:Polymers
[MDPI AG]
日期:2017-12-08
卷期号:9 (12): 688-688
被引量:87
摘要
As the interface between human and machine becomes blurred, hydrogel incorporated electronics and devices have emerged to be a new class of flexible/stretchable electronic and ionic devices due to their extraordinary properties, such as softness, mechanically robustness, and biocompatibility. However, heat dissipation in these devices could be a critical issue and remains unexplored. Here, we report the experimental measurements and equilibrium molecular dynamics simulations of thermal conduction in polyacrylamide (PAAm) hydrogels. The thermal conductivity of PAAm hydrogels can be modulated by both the effective crosslinking density and water content in hydrogels. The effective crosslinking density dependent thermal conductivity in hydrogels varies from 0.33 to 0.51 Wm−1K−1, giving a 54% enhancement. We attribute the crosslinking effect to the competition between the increased conduction pathways and the enhanced phonon scattering effect. Moreover, water content can act as filler in polymers which leads to nearly 40% enhancement in thermal conductivity in PAAm hydrogels with water content vary from 23 to 88 wt %. Furthermore, we find the thermal conductivity of PAAm hydrogel is insensitive to temperature in the range of 25–40 °C. Our study offers fundamental understanding of thermal transport in soft materials and provides design guidance for hydrogel-based devices.
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