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Issue 6, 2011
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Phase change materials of n-alkane-containing microcapsules: observation of coexistence of ordered and rotator phases

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Abstract

In the present investigation, the crystallization and phase transition behaviours of normal alkane (n-docosane) in microcapsules with a mean diameter of 3.6 μm were studied by the combination of differential scanning calorimetry (DSC), temperature-dependent X-ray diffraction (XRD) and variable-temperature solid-state nuclear magnetic resonance (VT solid-state 13C NMR). The DSC and VT solid-state 13C NMR results reveal that a surface freezing monolayer is formed prior to the bulk crystallization of the microencapsulated n-docosane. More interestingly, it is confirmed that after the bulk crystallization, the ordered triclinic phase coexists with the rotator phase I (RI) for the microencapsulated n-docosane. We argue that the reduction of the free energy difference between the two phases, resulting from the microencapsulation process, leads to the coexistence of the ordered triclinic and rotator phases of the normal alkanes.

Graphical abstract: Phase change materials of n-alkane-containing microcapsules: observation of coexistence of ordered and rotator phases

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Article information


Submitted
14 Jul 2010
Accepted
08 Dec 2010
First published
11 Jan 2011

Phys. Chem. Chem. Phys., 2011,13, 2021-2026
Article type
Paper

Phase change materials of n-alkane-containing microcapsules: observation of coexistence of ordered and rotator phases

D. Fu, Y. Su, B. Xie, H. Zhu, G. Liu and D. Wang, Phys. Chem. Chem. Phys., 2011, 13, 2021
DOI: 10.1039/C0CP01173H

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