Modified mica-supported phase change materials for efficient solar thermal conversion and thermal energy management

To improve the solar thermal conversion performance of composite phase change materials and further practical applications, the rational design and realization of excellent thermal properties, electrical properties, shape stability, and fast response to solar energy are essential. Three-dimensional layered composite phase change materials loaded with paraffin wax were prepared by vacuum impregnation method using polyethylene glycol grafted nanocellulose modified mica as the carrier. The prepared materials exhibited high bulk resistivity (1.47 x 10(13) Omega cm), excellent thermal conductivity (1.3 W/m K), outstanding solar energy conversion efficiency (98.3%), good thermal stability and reusability. It was noteworthy that the thermal conductivity of the composite was improved by 619.05% compared to pure paraffin. The three-dimensional layered structure of directional stacking and the polyethylene glycol-linked heat transfer channels greatly improved the thermal conductivity of the composite phase change material. These findings provide ideas for designing innovative materials that combine energy storage and other functional properties.