PubAg

Main content area

Nanoencapsulation of n-octadecane phase change material with silica shell through interfacial hydrolysis and polycondensation in miniemulsion

Author:
Liang, Shuen, Li, Qianbiao, Zhu, Yalin, Chen, Keping, Tian, Chunrong, Wang, Jianhua, Bai, Ruke
Source:
Energy 2015 v.93 pp. 1684-1692
ISSN:
0360-5442
Subject:
Fourier transform infrared spectroscopy, X-ray diffraction, chemical composition, condensation reactions, crystal structure, differential scanning calorimetry, encapsulation, energy, enthalpy, heat, hydrolysis, melting, nanocapsules, nanoemulsions, silica, temperature, thermal conductivity, thermal stability
Abstract:
Nanoencapsulation of n-octadecane phase change material with silica shell was performed through interfacial hydrolysis and polycondensation of tetraethyl orthosilicate in miniemulsion. The chemical composition and crystallinity of the synthesized n-octadecane@SiO2 nanocapsules were characterized by FT-IR spectroscopy and XRD analysis. DSC (differential scanning calorimetry) and TG results demonstrated that the as-prepared nanocapsules have high heat storage capability and good thermal stability. The melting enthalpy and encapsulation ratio of the nanocapsules were as high as 109.5 J g−1 and 51.5%, respectively. Most importantly, n-octadecane@SiO2 nanocapsules with different morphologies and sizes (169–563 nm) have been conveniently obtained via tuning water-to-ethanol ratio in continuous phase of the miniemulsion. With decreasing size of the n-octadecane@SiO2 nanocapsules, the phase change temperatures move to lower values due to Gibbs–Thomson effect. Moreover, the as-prepared nanocapsules possess high thermal conductivity, and can maintain their phase transition properties perfectly after 500 melting–solidifying thermal cycles, making them ideal candidates as thermal energy storage materials.
Agid:
5639955