Reinforcement and shape stabilization of phase-change material via graphene oxide aerogel
Reinforcement and shape stabilization of phase-change material via graphene oxide aerogel
复制标题
DOI：
10.1016/j.carbon.2016.11.069
复制
发表时间：
2017-04-01
期刊：
影响因子：
10.9
通讯作者：
Feng, Gang
中科院分区：
文献类型：
--
作者：
Xu, Yue;Fleischer, Amy S.;Feng, Gang
相变材料（PCM）在许多可能需要形状稳定的应用中受到关注。在这项研究中，氧化石墨烯气凝胶（GOxA）增强石蜡PCM复合材料的开发，有效地加强和形状稳定的石蜡。分子和衍射表征表明，GOxA网络对石蜡的结晶有潜在的影响，硬度和纳米压痕的力学性能表明，复合材料的硬度是纯石蜡的3 ~ 7倍，即使在高于石蜡熔点的温度下也能保持显著的强度。此外，该复合材料的应变率敏感性比石蜡低得多。通过GOxA的增强远远超出了混合规则的预测，这意味着一个强大的GOxA-石蜡界面bonding.To据我们所知，这是第一次研究石蜡和GOxA-PCM复合材料的力学行为，提供关键的洞察他们的行为。此外，由于其通用性和简单性，首次开发的硬度和硬度计指数之间的关系将使在不同环境条件下对许多其他应用的材料进行定量硬度计测试成为可能。(C)2016爱思唯尔有限公司版权所有
Phase change materials (PCMs) are of interest in many applications which may require shape stabilization. In this study, a graphene oxide aerogel (GOxA) reinforced paraffin PCM composite is developed, effectively reinforcing and shape-stabilizing the paraffin. The molecular and diffraction characterizations suggest that the GOxA network potentially affects paraffin's crystallization.The mechanical characterizations using durometer and nanoindentation show that the composite is 3 similar to 7x harder than pure paraffin and maintains significant strength even above paraffin's melting temperature. Moreover, the composite is much less strain-rate sensitive than paraffin. The reinforcement via GOxA is much beyond the prediction by the rule-of-mixture, implying a strong GOxA-paraffin interfacial bonding.To our best knowledge, this is the first study on the mechanical behavior of paraffin and GOxA-PCM composite, providing critical insights into their behavior. Additionally, the relationship between the hardness and durometer index first-ever developed here will enable the quantitative durometer testing on materials for many other applications at different ambient conditions due to its versatility and simplicity. (C) 2016 Elsevier Ltd. All rights reserved.