Preparation of thermally conductive flexible liquid silicone rubber composites by magnetic field‐induced self‐assembly of Fe₃O₄@C

Abstract

Efficient heat dissipation is very crucial for the performance, service life, and reliability of modern electronic devices. It is very challenging to improve heat dissipation efficiency through innovative material structure design. Therefore, in the work, dopamine (PDA) is used to coat the surface of graphite (C) with its excellent surface coating modification ability, so that the C surface has oxygen-containing groups to change its electronegativity, and Fe 2+ and Fe 3+ in the solution are attracted to the surface of C, and then in situ redox reaction occurs on the surface of C to generate magnetic graphite (Fe 3 O 4 @C). Fe 3 O 4 @C is uniformly dispersed into liquid silicone rubber (LSR) by solution blending, and Fe 3 O 4 @C performs integral directional filling in the LSR under the action of magnetic field (B = 140 mT), thus preparing Fe 3 O 4 @C/LSR composites. Through magnetic field orientation, the thermal conductivity of Fe 3 O 4 @C/ LSR composites reach 1.25 W/mÁK when the content of Fe 3 O 4 @C is 100 phr, which is 410% higher than that of pure LSR (0.2447 W/mÁK). Infrared thermal imaging test shows that Fe 3 O 4 @C/LSR composites has good heat dissipation performance, Fe 3 O 4 @C/LSR composites have shown great potential in terms of flexibility and high thermal conductivity.

A Facile Way of Enhancing Thermal Conduction in Epoxy-Based Nanocomposites via Construction of Well-Defined Hybrid Filler Networks Using a Magnetic Field

“…Figure k), which were calculated on the basis of Figures a-j. As judged from the temperature at a corresponding location, it was disclosed that the orderly orientation of magnetically responsive Co@GNPs under the influence of the magnetic field was conducive to improvement on in situ constructing of the thermally conductive paths in the composites. − …”

Preparation of Conductive Silicone-Rubber Composites by Dynamic Magnetic Field-Induced Orientation of Ferrosoferric Oxide-Loaded Reduced Graphene Oxide

“…However, previous studies have predominantly focused on static magnetic field induced orientation in magnetically conductive materials. Wang et al 40 and Wu 41 et al used a static magnetic field to induce filler orientation. In contrast, this paper employs dynamic magnetic field induced filler orientation, providing a method for preparing gradient materials for conductivity while improving the orientation and dispersion properties of the fillers.…”