Heterogeneous mesoporous composite material thermophysical property calculating method

Abstract

The invention relates to the research field of composite material property, in particular to a heterogeneous mesoporous composite material thermophysical property calculating method. The method includes the steps of: sample characterization: characterizing the properties of structure and composition of the composite material; thermophysical property testing: conducting thermophysical property testing on the composite material to measure values of thermal conductivity of all samples; theoretical calculation of the thermophysical property: respectively abstracting thermal conductivities of base material and filler of the heterogeneous mesoporous composite material to obtain the effective thermal conductivity by adopting kinetic theory in combination with molecular dynamics simulation, wherein near-field radiation, interface scattering as well as the coupling effect between the base material and the filler are taken into account; verification: in combination with the test result, further completing a relevant diathermanous mathematical model of the heterogeneous mesoporous composite material under nanometer pore size. Compared with the prior art, the heterogeneous mesoporous composite material thermophysical property calculating method disclosed by the invention solves the problem of solving the physical property parameters of the composite material under nanometer pore size, the accuracy of the thermophysical property is improved and material design is optimized.

Description

technical field [0001] The invention relates to the field of composite material performance research, in particular to a calculation method for the thermophysical properties of mesoporous heterogeneous composite materials. Background technique [0002] Nanomaterials are a new type of material with broad application prospects. "Nano material engineering" is the "commanding height" of the research and application of new materials in the 21st century. In recent years, a brand-new research object—“mesoporous composite materials” has emerged in the field of nanometers. It is one of the most promising development directions and an important part of nanomaterials engineering. [0003] Mesoporous heterogeneous composite material is a new nanomaterial born in recent years. Due to its special micro / nano structure, its thermal properties are affected by volume effect, quantum size effect, surface effect, quantum tunneling effect, and dielectric confinement effect. , Photon tunneling ...

AI Technical Summary

Problems solved by technology

At the nanoscale, due to the heterogeneous / heterogeneous characteristics of the dispersed phase, it will cause changes in the bonding properties of nanoparticles / clusters / nanowires or lattice lattices, forming microscopic local heterogeneity / heterogeneity, and can Cause changes in the way of heat carrier excitation; the volume effect, surface effect, and macroscopic quantum tunneling effect of dispersed phase nanoparticles / clusters / nanowires must involve the movement of phonons or electrons, and different shapes and properties of nanoparticles / The movement characteristics of cluster / nanowire thermal carriers and the resulting transport effect are of great concern; at the same time, the surface modification of nanoparticles / cluster / nanowire, the substrate and nanoparticle / cluster / nanowire Combination, which may lead to new transport phenomena and mechanisms, and its impact on interface scattering and volatility is also very challenging

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