Tunability of the thermal diffusivity of cellulose nanofibril films by addition of multivalent metal ions
Tunability of the thermal diffusivity of cellulose nanofibril films by addition of multivalent metal ions
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DOI：
10.1016/j.carbpol.2022.120010
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发表时间：
2022-08-23
影响因子：
11.2
通讯作者：
Uto，Takuya
中科院分区：
文献类型：
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作者：
Uetani，Kojiro;Kasuya，Keitaro;Uto，Takuya
发现调整纤维素纳米纤维（CNF）薄膜的传热性能的原理将为开发生物质衍生的传热材料打开大门，并摆脱现有的石油基聚合物复合材料。在这项研究中，我们添加了各种多价金属离子的CNF膜与表面羧基形成的2，2，6，6-四甲基哌啶-1-氧基（克里思）氧化和测量其在干燥状态下的热扩散率由一个原始的方法来验证的热扩散率的可调性。我们发现薄膜的面内热扩散率与离子半径成反比，与Pauling电负性成正比。碳纳米纤维膜与质子中和的羧基显示出最高水平的热扩散率之间的膜与各种金属离子。分子动力学模拟表明，引入的离子的空间分布是由TEMPO氧化的CNF表面的阳离子和羧酸氧原子之间的最近距离决定的。
Discovering principles to tune the heat-transport properties of cellulose nanofibril (CNF) films will open the door for the development of biomass-derived heat-transfer materials and break away from existing petroleum-based polymer composites. In this study, we added various multivalent metal ions to CNF films with surface carboxy groups formed by 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidation and measured their thermal diffusivities in the dry state by an original method to verify the tunability of the thermal diffusivity. We found that the in-plane thermal diffusivity of the film is inversely proportional to the ionic radius and directly proportional to the Pauling electro-negativity. The CNF film with proton-neutralized carboxyl groups showed the highest level of thermal diffusivity among the films with various metal ions. Molecular dynamics simulations clarified that the spatial distribution of the introduced ions is determined by the closest distance between the cation and carboxylate oxygen atom of the TEMPO-oxidized CNF surface.