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

Dongsheng Fu; Yunlan Su; Baoquan Xie; Haijin Zhu; Guoming Liu; Dujin Wang

doi:10.1039/c0cp01173h

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

Dongsheng Fu, Yunlan Su^*, Baoquan Xie, Haijin Zhu, Guoming Liu, Dujin Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	2021-2026
Number of pages	6
Journal	Physical Chemistry Chemical Physics
Volume	13
Issue number	6
DOIs	https://doi.org/10.1039/c0cp01173h
State	Published - 14 Feb 2011
Externally published	Yes

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title = "Phase change materials of n-alkane-containing microcapsules: Observation of coexistence of ordered and rotator phases",

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.",

author = "Dongsheng Fu and Yunlan Su and Baoquan Xie and Haijin Zhu and Guoming Liu and Dujin Wang",

year = "2011",

month = feb,

day = "14",

doi = "10.1039/c0cp01173h",

language = "英语",

volume = "13",

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journal = "Physical Chemistry Chemical Physics",

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TY - JOUR

T1 - Phase change materials of n-alkane-containing microcapsules

T2 - Observation of coexistence of ordered and rotator phases

AU - Fu, Dongsheng

AU - Su, Yunlan

AU - Xie, Baoquan

AU - Zhu, Haijin

AU - Liu, Guoming

AU - Wang, Dujin

PY - 2011/2/14

Y1 - 2011/2/14

N2 - 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.

AB - 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.

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DO - 10.1039/c0cp01173h

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SN - 1463-9076

VL - 13

SP - 2021

EP - 2026

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 6

ER -

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

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