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首页> 外文期刊>International Journal of Heat and Mass Transfer >Interfacial heat transfer behavior of graphene-based filler and calcium-silicate-hydrate in cement composites
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Interfacial heat transfer behavior of graphene-based filler and calcium-silicate-hydrate in cement composites

机译：水泥复合材料中石墨烯填料和硅酸钙 - 水合物的界面传热性能

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摘要

Interfacial heat transfer behaviors between graphene-based filler and cement matrix play a pivotal role in controlling the overall thermal properties and functional performance. The mechanism of heat transfer in graphene-based nanomaterial and cement has not been well understood. In this work, the interfacial thermal conductance (ITC) of graphene /calcium-silicate-hydrate (C-S-H) and graphene oxide (GO) /C-S-H are investigated using molecular dynamics simulation, focusing on the degree of oxidation and type of oxygen functional groups (epoxy and hydroxyl). It is found that ITC increases monotonously with the increase of oxygen-concentration. Phonon analysis reveals the increasing oxygen-concentration will improve phonon transfer efficiency at the interface zone. The type of filler also effect on the ITC, that is, GO-hydroxyl > GO-epoxy > graphene. The interfacial phonon transmission coefficient of GO-hydroxyl /C-S-H is lower than that of GO-epoxy /C-S-H at the same oxygen-concentration. In addition, an analytical relationship between binding energy and ITC is proposed to prove that high oxygen-concentration GO can improve both mechanical and thermal properties of cement-based materials. This study is helpful for understanding the interfacial heat transfer behaviors of nanomaterials-cement composites and provides guidance for the design and control of their thermal properties.
机译：石墨烯基填料与水泥基质之间的界面传热行为在控制整体热性能和功能性能方面发挥了枢转作用。基于石墨烯的纳米材料和水泥中的热传递机理尚未得到很好的理解。在这项工作中，使用分子动力学模拟研究石墨烯/硅酸钙 - 水合物（CSH）和石墨烯 - 氧化物（GO）/ CSH的界面热敏（ITC），专注于氧化程度和氧官能团的类型（环氧和羟基）。发现ITC随着氧气浓度的增加而单调增加。声子分析显示氧气浓度的增加将提高界面区域的声子传递效率。填料的类型也对ITC作用，即Go-羟基> Go-环氧树脂>石墨烯。 Go-羟基/ C-S-H的界面声子透射系数低于相同氧浓度的液相氧化物/ C-S-H的差相透射系数。此外，提出了结合能量和ITC之间的分析关系，以证明高氧浓度GO可以改善水泥基材料的机械和热性能。该研究有助于理解纳米材料 - 水泥复合材料的界面传热行为，为其热性能的设计和控制提供指导。

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