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Phase-change energy-storage material nanocapsule and preparation method thereof

A technology of phase-change energy storage materials and nanocapsules, which is applied in the field of capsules of phase-change energy storage materials and its preparation, can solve the problems of irregular shape of nanocapsules, insufficient emulsion stability, unfavorable practical application, etc., and achieve convenient large-scale Effects of batch preparation, high heat storage/release efficiency, and regular morphology

Active Publication Date: 2015-03-25
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Li et al. (ACS Sustainable Chem.Eng.2013,1,374-380) reported the preparation of silica-coated paraffin nanocapsules with a size of 200-500nm by in-situ emulsion interfacial hydrolysis-condensation method, but this method is not stable enough due to the , the prepared nanocapsules have irregular morphology, severe agglomeration, low yield (55%), and low phase transition enthalpy (45.5J / g), which is not conducive to practical application; Latibari et al. (Energy 2013,61,664-672 ) prepared silica-coated palmitic acid nanocapsules in emulsion by sol-gel method, but the steps are cumbersome, and the sol-gel reaction needs to be carried out step by step and cannot be completed in one pot

Method used

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  • Phase-change energy-storage material nanocapsule and preparation method thereof
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specific Embodiment approach

[0038] The specific embodiment of the present invention comprises the following steps:

[0039] 1) The oil phase formed by mixing the phase change energy storage material and tetraethyl orthosilicate in a reactor;

[0040] 2) Add water and ethanol to the oil phase described in step 1) to form a water phase, then add an emulsifier (ionic surfactant) and stir, so that the oil phase and the water phase are mixed to form an emulsion, and the oil in the emulsion The phase is dispersed in the water phase to form nano-scale droplets;

[0041]3) adding a basic catalyst to the emulsion to make it react, and obtain nanocapsules of phase-change energy storage materials after the reaction is completed;

[0042] Wherein the mass ratio of the energy storage material to tetraethyl orthosilicate is 1:1 to 5:1, the mass ratio of water to ethanol in the water phase is 0.5:1 to 20:1, and the emulsifier is an ion Type surfactant, its consumption is 0.2~5% of water phase quality, and the consump...

Embodiment 1

[0049] In a 100mL round bottom flask, add 2g of n-octadecane and 3g of tetraethyl orthosilicate to form an oil phase after miscibility, and then add 25mL of water and 17.7mL of ethanol to the flask in turn, and form a water phase after miscibility. Thereafter, add 0.82g cetyltrimethylammonium bromide, place the flask in a 35°C water bath, and magnetically stir the mixed solution in the flask for 30 minutes at a stirring rate of 1500 rpm to form water Oil-in-lotion. After completing the above steps, add 0.52mL of ammonia water with a mass concentration of 25wt% into the flask, and stir magnetically for 12 hours at 35°C at a stirring rate of 800 rpm. During this process, ethyl orthosilicate undergoes a hydrolysis-condensation reaction , forming a silica shell on the surface of the oil phase droplet. Filter the reacted mixed solution to obtain nanocapsules, wash them with deionized water several times, and then vacuum-dry them at 50°C for 24 hours to obtain nanocapsules with a s...

Embodiment 2

[0051] In a 100mL round bottom flask, add 2g of n-octadecane and 3g of tetraethyl orthosilicate to form an oil phase after miscibility, then add 25mL of water and 17.7mL of ethanol to the flask in turn, and form a water phase after miscibility. Thereafter, add 1.02g cetyltrimethylammonium bromide, place the flask in a 70°C water bath, and magnetically stir the mixed solution in the flask for 30 minutes at a stirring rate of 1500 rpm to form water Oil-in-lotion. After completing the above steps, add 0.52mL of ammonia water with a mass concentration of 25wt% into the flask, and stir magnetically for 6 hours at 70°C at a stirring rate of 800 rpm, during which ethyl orthosilicate undergoes hydrolysis-condensation reaction , forming a silica shell on the surface of the oil phase droplet. Filter the reacted mixed solution to obtain nanocapsules, wash them several times with deionized water, and then vacuum-dry them at 50°C for 24 hours to obtain nanocapsules with n-octadecane struc...

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Abstract

The invention discloses a phase-change energy-storage material nanocapsule and a preparation method thereof and particularly relates to a phase-change energy-storage material capsule using an inorganic material as a shell layer and a preparation method of the capsule. By dispersing an oil phase formed by mixing the phase-change energy-storage material and tetraethyl orthosilicate in an aqueous phase formed by water and ethanol in a shape of nanoscale droplets, carrying out hydrolysis-condensation reaction on tetraethyl orthosilicate in the presence of a basic catalyst, and forming a silicon oxide shell layer on the surface of each of oil phase droplet to coat the phase-change energy-storage material, thus obtaining the phase-change energy-storage material nanocapsule of which the particle size is less than 1mu m. The nanocapsule has the advantages of uniform particle size distribution, large surface area and high enthalpy of phase change. The preparation method is simple and feasible, is high in preparation yield and is conductive to prepration of the phase-change energy-storage material having high heat storage / release efficiency in a large scale.

Description

technical field [0001] The invention relates to a capsule of a phase-change energy storage material and a preparation method thereof, in particular to a capsule of a phase-change energy storage material with an inorganic material as a shell layer and a preparation method thereof. Background technique [0002] Phase change energy storage materials, also known as phase change materials (Phase Change Materials, PCMs), have become an ideal heat energy because they can store or release latent heat during the phase change process, and the temperature is constant during the process of storing and releasing latent heat. Storage materials have broad application prospects in the fields of solar energy utilization, building energy conservation, refrigeration systems, and constant temperature fabrics. [0003] Phase change energy storage materials include solid-liquid phase change energy storage materials, solid-solid phase change energy storage materials, solid-gas phase change energy ...

Claims

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Application Information

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IPC IPC(8): C09K5/06B01J13/16
CPCB01J13/16C09K5/063
Inventor 梁书恩田春蓉祝亚林顾远陈可平王建华
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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