Citation: WU Xiao-Lin, SUN Rong, ZHU Peng-Li, DU Ru-Xu. Near Infrared Spectrum Analysis of Organic/Inorganic Composite Microcapsule Phase Change Materials[J]. Acta Physico-Chimica Sinica, ;2011, 27(05): 1039-1044. doi: 10.3866/PKU.WHXB20110424 shu

Near Infrared Spectrum Analysis of Organic/Inorganic Composite Microcapsule Phase Change Materials

WU Xiao-Lin ^1,2 ,
SUN Rong ^1, ,
ZHU Peng-Li ¹ ,
DU Ru-Xu ³

1.
1. Shenzhen Institutes of Advanced?Technology, Chinese Academy of Sciences, Shenzhen 518055, Guandong Province, P. R. China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
3. The Chinese University of Hong Kong, Hong Kong, P. R. China

Received Date: 27 October 2010
Available Online: 11 March 2011
Fund Project: 国家自然科学基金(20971089)资助项目 (20971089)

Using Fourier transform near infrared (FT-NIR) spectroscopy, the characteristics and phase change mechanism of the phase change process for PMMA-SiO₂@PCM microcapsules were explored. We investigated changes in the microstructure of the microcapsules as well. The results show that the melting of paraffin molecules in the microcapsules is a process wherein the －CH₂ symmetric stretching vibration gradually increases and the asymmetric stretching vibration changes randomly. During the paraffin phase change process, the change in absorbance intensity is only half that of the shell materials. Additionally, NIR spectroscopy was used to analyze the core-shell structure and to monitor the phase change process for the microcapsules. The application of NIR spectroscopy to study the phase change process for microcapsule phase change materials has scientific significance and is of value to study the phase change mechanism for the determination of the most efficient phase change materials.
- Microcapsule,
- Fourier transform near infrared,
- Phase change material,
- Phase change,
- Organic/inorganic composite material
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