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Chinese Journal of Materials Research  2016, Vol. 30 Issue (6): 418-426    DOI: 10.11901/1005.3093.2015.599
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Preparation and Properties of SiO2 Based Hexadecanol-Palmitic Acid-Lauric Acid Microencapsulated Phase Change and Humidity Controlling Materials with Fine Particle Size
ZHANG Hao**(), HUANG Xinjie, ZONG Zhifang, LIU Xiuyu
School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243032, China
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ZHANG Hao, HUANG Xinjie, ZONG Zhifang, LIU Xiuyu. Preparation and Properties of SiO2 Based Hexadecanol-Palmitic Acid-Lauric Acid Microencapsulated Phase Change and Humidity Controlling Materials with Fine Particle Size. Chinese Journal of Materials Research, 2016, 30(6): 418-426.

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Abstract  

Microcapsules of phase change- and humidity-controlling material were synthesized by sol-gel method with hexadecanol-palmitic acid-lauric acid as core, SiO2 as shell and silaneas coupling agent. Then their performance of humidity controlling and temperature controlling, particle size distribution, composition and structure, surface morphology and thermal properties were characterized by isothermal sorption method, cooling curve measurement, laser particle analyzer (LPSA), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC) respectively. The results show that the amount of deionizedwater, absolute alcohol, hexadecanol-palmitic acid-lauric acid and silane coupling agent had great effect on the properties of the prepared phase change- and humidity-controlling materials. The phase change- and humidity-controlling material of good performance as spherical particles with smooth surface, homogeneous size distribution in a range of 1680.60~1735.35 nm and excellent dispersibility may be synthesized by the following optimal processing parameters: the mole ratio of deionized water totetraethyl orthosilicateis 9, the mole ratio of absolute alcohol totetraethyl orthosilicate 5, the mole ratio of hexadecanol-palmitic acid-lauric acid to tetraethyl orthosilicate 0.5, and the mole ratio of silane coupling agent totetraethyl orthosilicate 0.1.
Key words:  composite materials      hexadecanol-palmitic acid-lauric acid      SiO2      phase change and humidity controlling      fine particle size      microencapsulates     
Received:  22 October 2015     
ZTFLH:  TU522.1  
Fund: *Supported by National Natural Science Foundation of China No.51206002
About author:  **To whom correspondence should be addressed, Tel: 18755512282, E-mail: fengxu19821018@163.com
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Hao ZHANG
Xinjie HUANG
Zhifang ZONG
Xiuyu LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.599     OR     https://www.cjmr.org/EN/Y2016/V30/I6/418

Sample Mole ratio between deionizedwater and tetraethyl orthosilicate Mole ratio between absolute alcohol and tetraethyl orthosilicate Mole ratio between hexadecanol-palmitic acid-lauric acid and tetraethyl orthosilicate Mole ratio between silane coupling agent and tetraethyl orthosilicate
1 7 5 0.5 0.10
2 9 5 0.5 0.10
3 11 5 0.5 0.10
4 9 3 0.5 0.10
5 9 7 0.5 0.10
6 9 5 0.5 0.00
7 9 5 0.5 0.05
8 9 5 0.5 0.15
9 9 5 0.2 0.10
10 9 5 0.8 0.10
Table 1  Formulations of SiO2 based hexadecanol-palmitic acid-lauric acid microencapsulated phase change and humidity controlling materials
Fig.1  LPSA images of sample 1 (A), sample 2 (B) and sample 3 (C)
Fig.2  LPSA images of sample 4 (A), sample 2 (B) and sample 5 (C)
Fig.3  SEM images of sample 6 (A), sample 7 (B), sample 2 (C) and sample 8 (D)
Fig.4  FT-IR images of modified SiO2 (A), hexadecanol-palmitic acid-lauric acid (B), sample 9 (C), sample 2 (D) and sample 10 (E)
Fig.5  Equilibrium moisture content of sample 9 (A), sample 2 (B), sample 10 (C) and sample 6 (D)
Fig.6  Cooling curves (a. sample 9, b. sample 2, c. sample 10, d. sample 6)
Sample Phase change temperature (℃) Phase transition enthalpy (J/g) hexadecanol-palmitic acid-lauric acid
content (%)
Pure hexadecanol-palmitic acid-lauric acid 22.79~28.18 173.36~178.72 100
2 21.89~27.75 92.03~97.96 53.1~54.8
6 21.54~27.24 86.78~90.45 50.1~50.6
9 22.13~27.58 30.62~32.28 17.7~18.1
10 22.27~28.06 141.46~150.33 81.6~84.1
Table 2  Thermal properties of SiO2 based hexadecanol-palmitic acid-lauric acid microencapsulated phase change and humidity controlling materials
Relativehumidity
(%)		 Equilibrium moisture content (g/g) Descent rate
(%)
Without cycling After 500 cycling
Adsorbing moisture process Desorption moisture process Adsorbing moisture process Desorption moisture process Adsorbing moisture process Desorption moisture process
32.78 0.0895 0.0993 0.0813 0.0898 9.16 9.57
43.16 0.1100 0.1225 0.1020 0.1182 7.27 3.51
52.89 0.1203 0.1345 0.1089 0.1251 9.48 6.99
64.92 0.1296 0.1424 0.1174 0.1316 9.41 7.58
75.29 0.1486 0.1586 0.1347 0.1474 9.35 7.06
84.34 0.1769 0.1830 0.1621 0.1697 8.37 7.27
97.30 0.2145 0.2150 0.1990 0.2035 7.23 5.35
Table3  Equilibrium moisture content of sample 2
Fig.7  Cooling curves of sample 2
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