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Three-dimensional ordered macroporous perovskite thermochromatic material and preparation method thereof

A technology of thermochromic materials and three-dimensional order, which is applied in the direction of color-changing fluorescent materials, chemical instruments and methods, etc., can solve the problems that affect the application of materials and do not consider the influence of surface radiation characteristics, so as to save raw materials, facilitate optical parameters, The effect of uniform hole distribution

Inactive Publication Date: 2011-11-16
NANJING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

For example, literature 1 (Genchu ​​Tang, Thermochromic properties of manganese oxides La 1-x A x MnO 3 (A=Ca, Ba), Materials Letters, 2008) A bulk perovskite thermochromic material was prepared by a solid-state reaction method, but the influence of changes in the surface microstructure of the material on the surface radiation characteristics was not considered; Document 2 (Masahiro Sadakane, Facile procedure to prepare three-dimensionally ordered macroporous (3DOM) perovskite-type mixed metal oxides by colloidal crystal templating method, Chem Mater, 2005) prepared three-dimensionally ordered macroporous perovskite by colloidal crystal template method Mineral materials, but not pressed into film-like materials, which also affects the application of such materials in intelligent thermal control processes

Method used

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  • Three-dimensional ordered macroporous perovskite thermochromatic material and preparation method thereof
  • Three-dimensional ordered macroporous perovskite thermochromatic material and preparation method thereof
  • Three-dimensional ordered macroporous perovskite thermochromatic material and preparation method thereof

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preparation example Construction

[0015] to combine figure 1 , the preparation method of the three-dimensional ordered macroporous perovskite thermochromic material of the present invention, the steps are as follows:

[0016] The first step, the preparation of polystyrene (PS) colloidal microspheres:

[0017] Styrene (C 8 h 8 ), sodium hydroxide (NaOH), potassium persulfate (K 2 S 2 o 8 ), sodium styrene sulfonate (C 8 h 7 SO 3 Na); potassium bicarbonate (KHCO 3 ), nitrogen (N 2 ), deionized water (H 2 O) as a raw material, using an emulsion polymerization method, by changing the experimental conditions, to prepare monodisperse polystyrene (PS) colloidal microspheres with a particle size of 200-500 nm.

[0018] The second step, the assembly of polystyrene (PS) colloidal crystal template

[0019] The monodisperse polystyrene PS colloidal microspheres are deposited on a clean and dry quartz glass sheet by vertical deposition method, and assembled into a three-dimensional ordered PS colloidal crystal ...

Embodiment 1

[0027] La 0.8 Sr 0.2 MnO 3 Preparation of materials:

[0028] 1. Using the emulsion polymerization method, polystyrene (PS) colloidal microspheres with good monodispersity and an average particle size of about 220nm were prepared by controlling the synthesis conditions;

[0029]2. Immerse the clean and dry quartz glass sheet vertically into the weighing bottle containing the PS colloidal microsphere solution, and use the vertical deposition method to deposit the monodisperse PS colloidal microspheres on the quartz glass sheet to assemble into a three-dimensional ordered PS Colloidal crystal template;

[0030] 3. Choose ethanol as solvent, press La(NO 3 ) 3 ·6H 2 O:Sr(NO 3 ) 2 :Mn(CH 3 COO) 2 4H 2 The ratio of O=0.8:0.2:1 was weighed to prepare a precursor solution by weighing metal nitrate and acetate. After soaking the PS colloidal crystal template in the precursor solution for 5 minutes, pull out the template at a constant speed of 2cm / min, and then immediately p...

Embodiment 2

[0033] La 0.7 Ca 0.2 Sr 0.1 MnO 3 Preparation of materials:

[0034] Adopt the method identical with embodiment 1, press La (NO 3 ) 3 ·6H 2 O:Ca(NO 3 ) 2 4H 2 O:Sr(NO 3 ) 2 :Mn(CH 3 COO) 2 4H 2 The ratio of O=0.7:0.2:0.1:1 was weighed to prepare a precursor solution by weighing metal nitrate and acetate. Preparation of three-dimensional ordered macroporous La 0.7 Ca 0.2 Sr 0.1 MnO 3 perovskite materials.

[0035] figure 2 (a) and (b) are the prepared three-dimensional ordered macroporous La 0.8 Sr 0.2 MnO 3 and La 0.7 Ca 0.2 Sr 0.1 MnO 3 Topography of the microstructure of perovskite materials. The structure of the three-dimensional ordered macroporous material is highly ordered, and the pores are evenly distributed, and the large pores are connected with each other by regularly arranged small pores, thus forming a three-dimensional ordered spatial network structure. X-ray diffraction analysis shows that the two materials with different components ...

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Abstract

The invention discloses a three-dimensional ordered macroporous perovskite thermochromatic material and a preparation method thereof. The preparation method comprises the following steps of: depositing monodisperse polystyrene (PS) colloid microspheres on a clean and dry quartz glass sheet by adopting a vertical deposition method, and assembling into a three-dimensional ordered PS colloid crystal template; filling a precursor solution of La1-xAxMnO3 (A=Ca and / or Sr; and x is more than 0 and less than 3) in clearances of the PS colloid crystal template; and drying and calcining to remove the PS colloid crystal template to obtain the three-dimensional ordered macroporous perovskite thermochromatic material, wherein the surface and interior of the three-dimensional ordered macroporous perovskite thermochromatic material are provided with submicron-scale holes. The three-dimensional ordered macroporous perovskite thermochromatic material keeps the thermochromatic property of the conventional bulk material, and has a periodically arranged three-dimensional space net structure; and in the preparation method for the material, material consumption is low and components are uniformly mixed.

Description

technical field [0001] The invention belongs to the thermochromic material technology, in particular to a three-dimensional ordered macroporous perovskite thermochromic material and a preparation method thereof. Background technique [0002] Lanthanum manganate doped with strontium and calcium is a thermochromic variable emissivity material with perovskite structure, which has a good application prospect in the field of thermal control of spacecraft. Studies have shown that when the temperature changes between 173K-373K, the emissivity of the thermal radiation surface of the perovskite oxide material changes greatly. When the temperature is lower than the phase transition temperature, it is metallic with lower emissivity; and when the temperature is higher than the phase transition temperature, it is insulator with higher emissivity. The thermal control coating made of thermochromic materials is pasted on the surface of the temperature control equipment, which can automatic...

Claims

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Application Information

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IPC IPC(8): C09K9/00
Inventor 宣益民李强方俊飞范德松
Owner NANJING UNIV OF SCI & TECH
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