Polymer-based thermally conductive composites are widely used in microelectronics for heat dissipation and packaging, for which the filler arrangement and the filler/matrix interfacial thermal resistance (ITR) are key factors limiting superior thermal conduction realization. This work reveals the effects of filler modification and orientation on thermal duction in the boron nitride (BN)/hydroxyethyl cellulose (HEC) through multiscale simulation approaches. Nonequilibrium molecular dynamics (NEMD) identifies that the thermal conductivity of the BN molecule is not size-dependent and proves that thermal resistance is dramatically reduced after hydroxylation modification (BN). Finite element simulation (FEM) reveals that maintaining a proper tilt of BN may improve both the cross-plane and in-plane thermal conductivity of the composite. Experimentally, BN/HEC composites with high self-viscosity are prepared via a "moisture-activated" strategy, for which the introduction of BN and wet hot pressing contribute to the thermal resistance reduction and filler orientation, respectively. The in-plane thermal conductivity reaches 30.64 W/mK with a cross-plane thermal conductivity of 5.06 W/mK. The films show good adaptability to surface morphology with the thermal resistance decreasing to 1.42 K·cm/W. Practical thermal management demonstrates that the incorporation of BN/HEC facilitates a 15.05 °C reduction of the LED Al substrate compared to the common composite film.
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http://dx.doi.org/10.1021/acsami.4c20264 | DOI Listing |
J Colloid Interface Sci
December 2024
State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China. Electronic address:
The demand for lightweight heat dissipation design in highly miniaturized and portable electronic devices with high thermal density is becoming increasingly urgent. Herein, highly thermal conductive carbon nanotubes (CNTs) reinforced aluminum foam composites were prepared by catalyst chemical bath and subsequent in-situ growth approach. The dense CNTs show the intertwined structure features and construct high-speed channels near the surface of the skeletons for efficient thermal conduction, promoting the transport efficiency of heat flow.
View Article and Find Full Text PDFJ Mol Model
December 2024
Department of Physical and Numerical Sciences, Qurtuba University of Science and Information Technology, Peshawar, 25100, Pakistan.
Context: Vanadium hydride is of significant interest because of its potential applications in thermoelectric materials and hydrogen storage technologies. Understanding its structural, electronic, and thermoelectric properties is crucial for optimizing its performance in these applications. This study investigates these properties via density functional theory (DFT), revealing key insights into its stability and efficiency as a thermoelectric material.
View Article and Find Full Text PDFJ Mol Model
December 2024
Department of Studies in Physics, University of Mysore, Mysuru, 560006, India.
Context: In the context of biomaterials, triethylene glycol dimethacrylate (TEGDMA) is a widely used monomer in dental resins due to its favorable mechanical properties and ease of polymerization. However, improving its structural stability and enhancing its performance in biological applications remain crucial goals. This study examines the impact of incorporating gold (Au) nanoparticles into the TEGDMA matrix, focusing on their potential to improve mechanical, thermal, and optical properties for biomedical applications.
View Article and Find Full Text PDFMol Biol (Mosk)
December 2024
Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia.
A method has been developed for manufacturing biological microchips on an aluminum substrate with hydrophilic cells from brush copolymers with the formation of a matrix of cells using photolithography. The surface of aluminum substrates was previously coated with a thin, durable, moderately hydrophobic layer of cross-linked polymer to prevent contact with the aluminum surface of the components used in the analysis of nucleic acids. Aluminum biochip substrates have high thermal conductivity and low heat capacity, which is important for the development of methods for multiplex PCR analysis on a chip.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
Laboratory of Biopolymers and Nanotechnology in Food (BioNano), Graduate Program in Food Science and Technology, Department of Agroindustrial Science and Technology, Federal University of Pelotas, 96010-900 Pelotas, Brazil.
This study investigated the formation of fibers and capsules using rice starch as a wall material to encapsulate orange peel essential oil (OPEO) by electrospinning for antimicrobial applications. Rice starch at a concentration of 20 % (w/v) and varying OPEO concentrations (30 %, 40 %, and 50 %, w/w) were used to produce materials. Free OPEO was analyzed for its chemical profile and antimicrobial activity.
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