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Integration of Pore Confinement and Hydrogen-Bond Influence on the Crystallization Behavior of C18 PCMs in Mesoporous Silica for Form-Stable Phase Change Materials
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2017-11-15 00:00:00 , DOI: 10.1021/acssuschemeng.7b03267
Tingting Qian 1, 2 , Jinhong Li 3 , Xin Min 3 , Bin Fan 1, 2
Affiliation  

We report herein the integration of pore confinement and hydrogen-bond influence on the crystallization behavior of C18 PCMs PCM in mesoporous silica. Mesoporous silica nanoparticles with 2.74 nm pores are employed as supporting material. To evaluate the effect of the internal/external surfaces of silica on the crystallization behavior of C18 PCM, three kinds of PCMs with various functional terminals including stearic acid (SA), octodecane (OCC), and octadecanol (OCO) were employed, and the effects of various mass fractions of PCMs were comprehensively investigated as well. It is remarkable that the complete filling of the available nanosized pore volume and newly formed hydrogen bonds (H–O···O) are bound to result in the formation of the mesomorphic or amorphous phase of PCM; thus, no enthalpy can be evidenced by the DSC data. In addition, it turns out that the composite PCMs obtain at least a 2-fold increase over neat PCM in the thermal conductivity, due to the introduction of silica supporting material. The resulting three stabilized composites all exhibit favorable chemical compatibility, high thermal stability, improved thermal conductivity, and excellent thermal reliability, which are prerequisites for the storage and release of latent heat in PCMs.

中文翻译:

形状稳定相变材料的孔隙限制和氢键结合对中孔二氧化硅中C18 PCM结晶行为的影响

我们在这里报道了孔隙限制和氢键对中孔二氧化硅中C18 PCMs PCM结晶行为的影响的整合。具有2.74nm孔的中孔二氧化硅纳米颗粒用作支撑材料。为了评估二氧化硅内/外表面对C18 PCM结晶行为的影响,采用了三种具有不同功能末端的PCM,包括硬脂酸(SA),十八烷(OCC)和十八醇(OCO),并且还全面研究了PCM的各种质量分数的影响。值得注意的是,可用纳米级孔体积的完全填充和新形成的氢键(H-O···O)结合在一起,导致PCM的介晶相或非晶相形成。因此,DSC数据无法证明焓。此外,事实证明,由于引入了二氧化硅支撑材料,复合材料PCM的导热率比纯PCM至少提高了2倍。所得的三种稳定化复合材料均显示出良好的化学相容性,高热稳定性,改善的导热性和出色的热可靠性,这是在PCM中存储和释放潜热的先决条件。
更新日期:2017-11-16
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