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Low temperature magnetic refrigeration material based on molecular magnet and its preparation method and application

A technology of magnetic refrigeration materials and molecular magnets, applied in the field of material science, can solve the problems of low efficiency, achieve low blocking temperature, improve efficiency, and good air stability

Active Publication Date: 2021-10-29
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the molecular magnets widely studied mainly focus on Mn 12 , Fe 8 The representative system without intermolecular interaction, its magnetic entropy change only changes abruptly near the blocking temperature, and the efficiency is low

Method used

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  • Low temperature magnetic refrigeration material based on molecular magnet and its preparation method and application
  • Low temperature magnetic refrigeration material based on molecular magnet and its preparation method and application
  • Low temperature magnetic refrigeration material based on molecular magnet and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Precursor Et-SaoH 2 The preparation steps are as follows: successively add 50mL of water, 2.6g of hydroxylamine hydrochloride and 1g of sodium hydroxide into the flask, stir electromagnetically and heat to 80°C in a water bath at the same time, until the solute is completely dissolved, add 3.5mL of o-hydroxybenzene dropwise with a dropper Acetone, then heated to 90°C in a water bath, stirred for one hour, took out the stirring bar, and allowed the solution to stand at room temperature for one day to make it crystallize. The product is a pink solid, which is pulverized and dried to obtain o-hydroxypropiophenone oxime (Et-SaoH 2 ).

[0044] MnII(ClO 4 ) 2 ·6H 2 O (0.25g, 0.98mmol), Et-SaoH 2 (0.17g, 1mmol) and 1.0M of NEt 4 Aqueous (OH) solution (2 mL) was dissolved in 25 mL of methanol. After stirring for 1 hour, the resulting dark green solution was filtered and evaporated slowly. Crystals were obtained from the mother liquor after one week [Mn 3 O(Et-sao) 3 (...

Embodiment 2

[0047] Precursor Et-SaoH 2 The preparation steps are as follows: add 50mL of water, 2.6g of hydroxylamine hydrochloride and 1g of sodium hydroxide to the flask successively, stir electromagnetically and heat to 70°C in a water bath at the same time, until the solute is completely dissolved, add 3.5mL of o-hydroxybenzene dropwise with a dropper Acetone, then heated to 90°C in a water bath, stirred for one hour, took out the stirring bar, and allowed the solution to stand at room temperature for one day to make it crystallize. The product is a pink solid, which is pulverized and dried to obtain o-hydroxypropiophenone oxime (Et-SaoH 2 ).

[0048] MnII(ClO 4 ) 2 ·6H 2 O (0.25g, 0.98mmol), Et-SaoH 2 (0.17g, 1mmol) and 1.0M of NEt 4 Aqueous (OH) solution (2 mL) was dissolved in 25 mL of methanol. After stirring for 1 hour, the resulting dark green solution was filtered and evaporated slowly. Crystals were obtained from the mother liquor after one week [Mn 3 O(Et-sao) 3 (Cl...

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Abstract

The invention provides a molecular magnet-based low-temperature magnetic refrigeration material, its preparation method and application. Molecular magnet [Mn 3 O(Et‑sao) 3 (ClO 4 )(OH) 3 ] With its low blocking temperature and good air stability, it can be applied to magnetic refrigeration in the liquid helium temperature region; secondly, by controlling the external magnetic field, the molecular magnet [Mn 3 O(Et‑sao) 3 (ClO 4 )(OH) 3 ] at the characteristic temperature T O Nearby, exhibit normal magnetocaloric effect or inverse magnetocaloric effect, respectively, which can greatly improve the efficiency of the magnetic refrigeration cycle. Molecular magnets can also be used [Mn 3 O(Et‑sao) 3 (ClO 4 )(OH) 3 ] The diamagnetocaloric effect is used as a heat sink to cool the magnetization heating of conventional magnetic refrigeration materials.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a molecular magnet-based low-temperature magnetic refrigeration material, its preparation method and application. Background technique [0002] The magnetocaloric effect (MCE) was first proposed by E. Warburg in 1881. The magnetic refrigeration technology based on this effect is considered to be an effective alternative to the traditional vapor cycle refrigeration technology due to its environmental friendliness and high cycle efficiency. The principle can be described as, for magnetic media, the total entropy of the system consists of two parts, namely the magnetic entropy S related to the external magnetic field M and the lattice entropy S independent of the applied magnetic field Latt . If an external magnetic field is applied to the system under adiabatic conditions, the magnetic moments will tend to align along the direction of the magnetic field, and the degene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/42H01F41/02C30B29/54C30B7/04C09K5/14
CPCC09K5/14C30B7/04C30B29/54H01F1/42H01F41/0253
Inventor 安璐璐崔岩李艳荣宋小会王云平
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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