A "core-shell" mesoporous silica/organic phase change material composite nanocapsule and its preparation method

A technology of mesoporous silica and nanocapsules, which is applied in nanotechnology, microcapsule preparations, chemical instruments and methods for materials and surface science, and can solve the problems of slow heat conduction rate, large degree of supercooling, and phase change control. In order to improve heat storage efficiency, reduce subcooling degree, improve heat conduction and thermal response rate, etc.

Active Publication Date: 2020-07-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as phase change energy storage material microcapsules are used as independent energy storage units in cutting-edge fields such as cooling of integrated circuit chips and precise temperature control of new biosensors, the application range continues to expand, while traditional "core-shell" phase change material microcapsules There are defects such as slow heat conduction rate, large degree of subcooling, and poor phase change temperature control ability, so it is urgent to develop phase change material nanocapsules with larger specific surface area to provide a larger phase change material contact surface to Implement faster heat conduction, thereby greatly reducing the undercooling of phase change materials, enhancing thermal sensitivity, and increasing their thermal response rate

Method used

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  • A "core-shell" mesoporous silica/organic phase change material composite nanocapsule and its preparation method
  • A "core-shell" mesoporous silica/organic phase change material composite nanocapsule and its preparation method
  • A "core-shell" mesoporous silica/organic phase change material composite nanocapsule and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of non-water dispersible "oil-in-water" emulsion

[0033] Mix 5.0g of n-eicosane and 6.5g of tetraethyl orthosilicate in a 250ml three-necked reaction flask at a mixing temperature of 50°C and keep stirring at a speed of 300rpm for 30min to obtain a stable and uniform oil phase solution; in another In a large beaker, dissolve 1.0g of cetyltrimethylammonium bromide as a cationic surfactant in 75ml of formamide, stir magnetically at 50°C until the surfactant is completely dissolved, then pour it into three In the reaction flask, the stirring was continued for 5 hours to obtain a stable non-water dispersible "oil-in-water" emulsion.

[0034] (2) Hydrolysis of silicon source, silica sol / organic phase change material three-dimensional composite micellar self-assembly and micellar interfacial polycondensation

[0035] Keep the reaction temperature in the step (1) at 50°C, slowly add 75ml of pH-0.24 aqueous hydrochloric acid as an initiator in a three-necked r...

Embodiment 2

[0037] (1) Preparation of non-water dispersible "oil-in-water" emulsion

[0038] Mix 5.0g of n-octadecane and 6.5g of tetraethyl orthosilicate in a 250ml three-necked reaction flask at a mixing temperature of 45°C and keep stirring at a speed of 350rpm for 30min to obtain a stable and uniform oil phase solution; in another In a large beaker, dissolve 1.0g of cetyltrimethylammonium bromide as a cationic surfactant in 75ml of formamide, stir magnetically at 45°C until the surfactant is completely dissolved, then pour it into three In the reaction flask, the stirring was continued for 5 hours to obtain a stable non-water dispersible "oil-in-water" emulsion.

[0039] (2) Hydrolysis of silicon source, silica sol / organic phase change material three-dimensional composite micellar self-assembly and micellar interfacial polycondensation

[0040] Keep the reaction temperature in the step (1) constant at 45°C, slowly add 75ml of pH-0.24 aqueous hydrochloric acid as an initiator in a thr...

Embodiment 3

[0042] (1) Preparation of non-water dispersible "oil-in-water" emulsion

[0043] Mix 5.0g of n-docosane and 6.5g of tetraethyl orthosilicate in a 250ml three-necked reaction flask, the mixing temperature is 55°C, and the stirring is continued at a speed of 300rpm for 30min to obtain a stable and uniform oil phase solution; In a large beaker, dissolve 1.0g of cetyltrimethylammonium bromide as a cationic surfactant in 75ml of formamide, stir magnetically at 55°C until the surfactant is completely dissolved, then pour it into In the three-necked reaction flask, the stirring was continued for 5 hours to obtain a stable non-water-dispersible "oil-in-water" emulsion.

[0044] (2) Hydrolysis of silicon source, silica sol / organic phase change material three-dimensional composite micellar self-assembly and micellar interfacial polycondensation

[0045] Keep the reaction temperature in the step (1) at 55°C, slowly add 75ml of pH-0.24 aqueous hydrochloric acid as an initiator in a three...

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Abstract

The invention discloses a 'core-shell' type mesoporous silica / organic phase change material composite nano capsule and a preparation method thereof and belongs to the technical field of phase change energy storage materials. The nano capsule consists of a dense silica shell and a mesoporous silica / organic phase change material composite core, is of a long-range order mesoporous structure inside, has an external diameter smaller than 200nm, and is of a typical 'core-shell' structure; the organic phase change material accounts for 35-50wt% by mass of the nano capsule. The preparation method of the nano capsule comprises the following steps: implementing an emulsion template self-assembling method and an emulsion template interfacial polycondencation method, strictly controlling reaction conditions such as the amount of a surfactant, the core-shell raw material proportion and the stirring velocity, and carrying out in-situ formation in the sol-gel process, thereby obtaining the nano capsule. Compared with a conventional phase change microcapsule, the nano capsule disclosed by the invention has rapid thermal response and heat conduction velocities and low supercooling degrees, and high-sensitivity heat temperature adjustment and heat management can be effectively implemented.

Description

technical field [0001] The invention relates to a phase-change energy storage material nanocapsule, in particular to a mesoporous silica / organic phase-change material composite nanocapsule with a "core-shell" structure and a preparation method thereof, belonging to phase-change energy storage material technology field. Background technique [0002] As the driving force of production and life in human society, energy is closely related to the development of modern society and economic prosperity. Today, the world's energy has entered a new period of change. The problem of energy shortage has appeared in most countries and even in the whole world, and has become a common problem faced by all countries in the world. Since human beings have asked the earth for a large amount of non-renewable energy such as coal, oil, and natural gas, the coal resources of some countries have been exhausted, leading to increasingly prominent problems such as the depletion of mineral energy and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/16C09K5/06B82Y30/00B82Y40/00
CPCB01J13/16B82Y30/00B82Y40/00C09K5/063
Inventor 汪晓东孙朝刘欢武德珍
Owner BEIJING UNIV OF CHEM TECH
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