Related Experiment Video
Updated: Aug 14, 2026

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
Published on: April 10, 2017
Liquid Crystal Interface Engineering Enhances Thermal Conduction for Efficient Thermal Management
Bing Yao1, Xiang Li1, Xiaofan Liang1
1School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, Jiangsu221116, China.
Abstract:
High-power integrated electronics demand heat-dissipation materials with high thermal conductivity, flexibility, and thermal stability. Herein, a liquid crystal (LC)-modified graphene interface engineering strategy is developed to fabricate aramid composite films. The polycyclic aromatic LC anchors onto graphene via strong π-π interactions, as confirmed by density functional theory. This modification improves interfacial compatibility between graphene and aramid without damaging the graphene lattice. Molecular dynamics simulations reveal that the LC interlayer effectively suppresses the interfacial thermal resistance (ITR), as the LC molecules facilitate enhanced frequency matching and vibrational mode coupling between the graphene and aramid networks. Benefiting from the ordered flow characteristics of the LC under hot pressing, the defects and gaps at the interface can be filled, forming ordered and dense thermal conduction pathways. The composite film achieves a maximum in-plane thermal conductivity of 15.39 W·m-1·K-1 at 40 wt % liquid crystal-modified graphene (LC-graphene) loading, which is 6.36 times that of a pure aramid nanofiber (ANF) film. Moreover, the film exhibits outstanding thermal stability with an initial decomposition temperature above 450 °C and mechanical properties with tensile strength reaching 101 MPa. As a heat dissipation material, it reduces the operating temperature of circuit and high-power LEDs by ∼25 °C compared to commercial pads. This work provides a promising interface design strategy for aramid-based thermal management composites.
Related Concept Videos
Mechanisms of Heat Transfer II
Mechanisms of Heat Transfer
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.
Mechanisms of Heat Transfer I
Mechanism of heat transfer
Thermal expansion and Thermal stress: Problem Solving
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
Phase Transitions: Melting and Freezing
