Novel organic-inorganic hybrid sheet Janus heat conducting filler and preparation method thereof

A thermally conductive filler and organic technology, applied in the field of sheet-like Janus thermally conductive fillers and their preparation, can solve problems such as unreported application of thermally conductive fillers, and achieve the effects of improving dispersion and improving heat transfer efficiency

Pending Publication Date: 2019-07-02
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although Janus particles have shown potential applications in stabilizing emulsion interfaces, optics, bi

Method used

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  • Novel organic-inorganic hybrid sheet Janus heat conducting filler and preparation method thereof
  • Novel organic-inorganic hybrid sheet Janus heat conducting filler and preparation method thereof
  • Novel organic-inorganic hybrid sheet Janus heat conducting filler and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] 1) The mass ratio is 0.1% of SiO with hydroxyl groups on the inside and amino groups on the outside 2 Hollow spheres (hollow spheres with a diameter of 5 μm and a wall thickness of 15 nm) are dispersed in deionized water;

[0021] 2) Continue to dissolve silver nitrate and PVP with a mass ratio of 1:1 in the dispersion of hollow spheres, and add ascorbic acid (with Ag + The molar ratio is 2), the Ag + Reducted into Ag, and deposited on the surface of the silica hollow sphere, the hollow sphere with Ag nanoparticles deposited on the surface was obtained, and its intrinsic thermal conductivity was measured to be 110 (W / mK);

[0022] 3) The prepared hollow spheres deposited with Ag are crushed into nanosheets with a sheet diameter of 0.5-2 μm, and the hydroxyl groups inside the hollow spheres are exposed to obtain the intermediate product Ag-J-OH Janus sheets;

[0023] 4) Disperse Ag-J-OH Janus tablets in toluene, add silane coupling agent, 4-chloromethylphenyltrimethoxy...

Embodiment 2

[0027] 1) The mass ratio is 0.1% of SiO with hydroxyl groups on the inside and amino groups on the outside 2 Hollow spheres (hollow spheres with a diameter of 5 μm and a wall thickness of 15 nm) are dispersed in deionized water;

[0028] 2) Continue to dissolve silver nitrate and PVP with a mass ratio of 2:1 in the dispersion liquid of the hollow sphere, and add ascorbic acid (the molar ratio to Ag+ is 2) under high-speed stirring, and the Ag+ + It is reduced to Ag and deposited on the surface of the silica hollow sphere to obtain a hollow sphere with Ag nanoparticles deposited on the surface, and its intrinsic thermal conductivity is measured to be 160 (W / mK);

[0029] 3) The prepared hollow spheres deposited with Ag are crushed into nanosheets with a sheet diameter of 0.5-2 μm, and the hydroxyl groups inside the hollow spheres are exposed to obtain the intermediate product Ag-J-OH Janus sheets;

[0030] 4) Disperse Ag-J-OH Janus tablets in toluene, add silane coupling agent...

Embodiment 3

[0034] 1) The mass ratio is 0.1% of SiO with hydroxyl groups on the inside and amino groups on the outside 2 Hollow spheres (hollow sphere diameter is 7μm, wall thickness is 20nm) dispersed in deionized water;

[0035] 2) Continue to dissolve copper sulfate and CTAB with a mass ratio of 1:1 in the dispersion of hollow spheres, and add ascorbic acid (with Cu 2+ The molar ratio is 4), the Cu 2+ Reducted into Cu, and deposited on the surface of the silica hollow sphere, the hollow sphere with Cu nanoparticles deposited on the surface was obtained, and its intrinsic thermal conductivity was measured to be 52 (W / mK);

[0036] 3) Pulverize the prepared Cu-deposited hollow spheres into nanosheets with a sheet diameter of 2 μm, so that the hydroxyl groups inside the hollow spheres are exposed, and the intermediate product Cu-J-OH Janus sheets are obtained;

[0037] 4) Disperse Cu-J-OH Janus tablets in toluene, add silane coupling agent, bromophenyltrimethoxysilane, and react in an o...

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Abstract

The invention discloses an organic-inorganic hybrid sheet Janus heat conducting filler and a preparation method thereof. Heat conducting metal nano-particles and graft organic molecules are respectively deposited at two sides of a silica Janus sheet. Compared with homogeneous materials formed by modifying an inorganic filler with the organic molecules, the Janus filler has the following special advantages: the heat conducting inorganic particles are densely deposited at one side of the filler, and are in full contact with the filler, so formation of a heat conducting path in a local range is benefited; the other side of the filler is grafted with the organic molecules, so the dispersion of the filler is improved, and the original heat conducting ability of the heat conducting particles isreserved; and when the Janus filler is compounded with a matrix material, the sheet structure of the Janus filler, especially the asymmetry of the in-plane density and the outer-plane density, causedby deposition of the inorganic particles at one side of the filler, makes the Janus filler distributed in the polymer matrix in an oriented manner and constructs a heat conducting network at a low filling part number, so the heat conductivity of the polymer composite material is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and relates to a novel heat-conducting filler and its preparation technology, in particular to a flaky Janus heat-conducting filler with heat-conducting inorganic particles deposited on both sides and organic molecules that improve the compatibility between the filler and the polymer matrix. its preparation technology. Background technique [0002] High thermal conductivity polymer composites play a vital role in the stability and life of aerospace, electronic and electrical, medical and health components, and their research has attracted much attention in recent years. However, most polymers are poor conductors of heat, and the heat conduction of polymers is mainly realized by filling inorganic heat-conducting materials, and inorganic fillers with high thermal conductivity (metals, carbon materials, nitrides, carbides, metal oxides, etc.) are compatible with the polymer matrix. Poo...

Claims

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Application Information

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IPC IPC(8): C08K9/02C08K9/06C08K9/08C08K7/26
CPCC08K7/26C08K9/02C08K9/06C08K9/08C08K2201/011
Inventor 聂华荣贺爱华韩霄
Owner QINGDAO UNIV OF SCI & TECH
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