Work

Development and characterization of modified sepiolite-based composite phase change materials for building thermal management

Year: 2025

Type: article

Abstract: To enhance the purity and hydrophobicity of sepiolite, sepiolite (ST) was modified by different concentrations of hydrochloric acid (HCl) and octyltrimethoxysilane (OS), resulting in modified sepiolite (ST m ). A stable composite phase change material (LA-PA/ST m ) was prepared by vacuum adsorption method using a certain amount of ST m mixed with a binary eutectic phase change material of lauric acid and palmitic acid (LA-PA). The results showed that ST m0.5 , modified by 0.5 mol·L −1 hydrochloric acid and OS, exhibited the strongest adsorption capacity. When the mass fraction of ST m0.5 in LA-PA/ST was 66 %, LA-PA was evenly distributed in the pores of ST m0.5 without leakage in the molten state. Compared with pure LA-PA, the thermal conductivity of LA-PA/ST m0.5 was 1.12 W·m −1 ·k −1 , an improvement of 386.21 %. At 100 °C, the mass of LA-PA/ST m0.5 remained unchanged, indicating good thermal stability. The experiment on heat storage and release under lighting proves that the temperature control performance improves as the content of LA-PA/STm0.5 in the cement paste increases, indicating a broad development prospect in the field of building thermal management.

Source: Energy Reports

DOI: 10.1016/j.egyr.2025.03.057