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Hydrophobic modification of silica/exfoliated graphite nanoplatelets aerogel and its application as supporting material for form-stable phase change materials
Journal of Industrial and Engineering Chemistry ( IF 6.1 ) Pub Date : 2021-05-01 , DOI: 10.1016/j.jiec.2021.04.054
Ni Tan , Yang Feng , Ping Hu , Qi Li , Chuan-Huang Lin , Yu-Hao Ning , Hao-Nan Zhou , Lin-Ping Yu , Zhong Cao , Ju-Lan Zeng

Hydrophobic modified silica/exfoliated graphite nanoplatelets aerogel (M-SiO2/xGnP) were successfully prepared via surface modification of silica/xGnP alcogel and followed by ambient pressure drying. Afterwards, form-stable PCMs in which capric–palmitic acids eutectic (CA–PA) was confined in the prepared aerogels were obtained by vacuum infiltration. Characterization of the prepared form-stable PCMs revealed that both the hydrophobic modification and the doping of xGnP could effectively improve the loading of CA–PA in the aerogel. The unmodified silica aerogel could not adsorb CA–PA, while the loading of CA–PA in the surface modified pure silica aerogel supported form-stable PCM and the unmodified silica/xGnP aerogel supported form-stable PCM were 24.2 wt% and 44.4 wt%, respectively. Besides, the hydrophobic modification and the doping of xGnP showed significant synergistic effect. The loading of CA–PA in the M-SiO2/xGnP supported form-stable PCM (FPCM/xGnP-20-48) could attain 78.9 wt% when the M-SiO2/xGnP was obtained by modifying the alcogel with 20 vol% trimethyl chlorosilane for 48 h. The FPCM/xGnP-20-48 not only had high latent heat and good thermal reliability, but also exhibited significantly improved thermal conductivity and alleviated supercooling due to the effective thermal conductive network formed by xGnP and the promoted heterogeneous nucleation of CA–PA at interfaces with aerogel.



中文翻译:

二氧化硅/片状石墨纳米片气凝胶的疏水改性及其在形稳相变材料中的应用

通过对二氧化硅/ xGnP醇凝胶进行表面改性,然后在常压下干燥,成功制备了疏水改性的二氧化硅/片状石墨纳米片气凝胶(M-SiO 2 / xGnP)。之后,通过真空渗透获得了形状稳定的PCM,其中癸-棕榈酸共晶(CA-PA)被限制在制备的气凝胶中。制备的形状稳定的PCM的表征表明,疏水改性和xGnP的掺杂都可以有效地改善气凝胶中CA-PA的负载量。未改性的二氧化硅气凝胶不能吸附CA-PA,而表面改性的纯二氧化硅气凝胶负载的形状稳定PCM和未改性的二氧化硅/ xGnP气凝胶负载的形状稳定PCM中CA-PA的负载量分别为24.2  wt%和44.4 分别为wt%。此外,xGnP的疏水改性和掺杂表现出显着的协同作用。当通过将醇凝胶改性20体积获得M-SiO 2 / xGnP时,CA-PA在M-SiO 2 / xGnP支撑的形状稳定PCM(FPCM / xGnP-20-48)中的负载量可达到78.9  wt%。%三甲基氯硅烷反应48小时。FPCM / xGnP-20-48不仅具有较高的潜热和良好的热可靠性,而且由于xGnP形成的有效导热网络以及在界面处CA-PA的异质成核得到促进,因此具有显着改善的导热性并减轻了过冷现象。气凝胶。  

更新日期:2021-05-18
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