Thermally conductive composites have emerged as a promising lead towards a more suitable and efficient alternative for thermal management. Their advantage lies in the coupling of different but complementary properties such as thermal conductivity for heat dissipation and flexibility for fitting surface irregularities. However, such materials consisting of ceramic fillers dispersed in a polymeric matrix generally suffer from particle sedimentation that ultimately affects their performance. Therefore, the overall properties of these composites can be further enhanced through structural improvements. Dielectrophoretic alignment has proven to be an effective and practical method to reach better structures that eventually improve the composites’ properties. This paper focuses on the enhancement of thermal and dielectric properties of Al₂O₃/PDMS composites through dielectrophoretic alignment. A novel method for measuring sedimentation effects is presented with a particular emphasis on the role of dielectrophoresis in counteracting those undesired effects. The influence of the relevant parameters such as the amplitude and frequency of the applied electric field is analyzed in order to draw the best structuring conditions. The thermal conductivity as well as the dielectric response are then compared between structured and unstructured composites. This comparison revealed a significant structural improvement that led to enhanced thermal conductivities while keeping the insulating properties unchanged.

导热复合材料已成为一种有希望的引领者，可以为热管理提供更合适和更有效的替代方案。它们的优势在于耦合不同但互补的特性，例如用于散热的导热性和用于配合表面不规则性的灵活性。然而，由分散在聚合物基体中的陶瓷填料组成的这种材料通常会遭受最终影响其性能的颗粒沉降。因此，这些复合材料的整体性能可以通过结构改进进一步增强。介电泳排列已被证明是一种有效且实用的方法，可以达到更好的结构，最终改善复合材料的性能。本文重点研究铝的热性能和介电性能的增强₂ O ₃ /PDMS 复合材料通过介电泳排列。提出了一种测量沉降效应的新方法，特别强调介电泳在抵消这些不良影响中的作用。分析外加电场幅值和频率等相关参数的影响，以得出最佳结构条件。然后比较结构化和非结构化复合材料之间的热导率和介电响应。这种比较揭示了显着的结构改进，导致热导率提高，同时保持绝缘性能不变。