Effects of Dopamine-Modified and Organic Intercalation on the Thermophysical Properties of Octadecane/Expanded Vermiculite Composite Phase Change Materials

Abstract

For phase change materials (PCMs) confined in porous structure, the interface interaction between the PCM and the porous skeleton is the key factor to determine the thermal storage performance of PCM. In this study, the modified expanded vermiculite (EVM) was prepared by dopamine modification and DTA + intercalation method and a series of EVM-based composite phase change materials with form shape (fs-CPCMs) were prepared by physical impregnation using n -octadecane as PCMs. The heat storage performance of the composite phase change materials were improved obviously, and the encapsulation ratio is increased to 84.7% and 83.1%. The nonisothermal crystallization process of prepared composite phase change material were further studied. The effects of dopamine modification and organic intercalation on the encapsulation performance of EVM-based fs-CPCMs were analyzed. The results of XRD, FT-IR, thermal cycle, and TGA tests showed that EVM-based composite phase change materials had good chemical compatibility, thermal reliability, and thermal stability. This study provides a theoretical basis for the preparation of EVM-based fs-CPCMs with high thermal stability and good heat storage performance.

Smart Energy Clays: Chemical Vapor Deposition of PEDOT in Expanded Vermiculite Blocks for Electrochemical Energy Storage

“…In order to further explore the molecular structure and bonds as well as chemical composition of EVMT before and after the CVD process, the corresponding spectral analysis was carried out. The FT-IR spectra of EVMT and PEDOT/EVMT-180 are presented in Figure a, revealing the characteristic peaks at 950 and 665 cm –1 , which correspond to Si–O–Si and Si–O–Al stretching vibration as well as Si–O–Mg bending vibration of EVMT. − In the spectrum of PEDOT/EVMT-180, characteristic peaks of vermiculite are significantly weakened by PEDOT. The absorption bands observed at 1643, 1515, and 1319 cm –1 are attributed to stretching vibrations of CC and C–C bonds within the thiophene ring.…”

Thermal degradation studies and hybrid neural network modelling of eutectic phase change material composites

“…Now, the fitness function was evaluated for each particle to determine the best individual and global particle in the swarm. The fitness function used in this algorithm is mean square error, which can be calculated using Equation (23).…”

“…Typically, supporting materials have a porous structure that can prevent PCM leakage while also improving thermal conductivity. Over the last few years, researchers have used a variety of porous structure materials, including diatomite, 21 kaolin, 22 expanded vermiculite, 23 expanded perlite, 24 and expanded graphite 25 . EG, in particular, garners additional attention from fundamental and scientific perspectives due to its demonstrated thermophysical stability.…”

Preparation and Characterization of Lauric Acid/Modified Fly Ash/Graphene Composite as Low-Cost and Eco-Friendly Phase Change Materials for Thermal Energy Storage

“…A simple and effective method is to adsorb PCMs into porous minerals to fabricate form-stable PCMs (FSPCMs). The porous minerals that can act as supporting materials are as follows: diatomite (DT) [25,26], sepiolite [27,28], vermiculite [29,30], attapulgite [31,32], and so on. The package efficiencies of these raw porous minerals are acceptable.…”