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Flexible perovskite thermal-control film and preparation method thereof

A thermal control thin film, perovskite technology, applied in the direction of manganate/permanganate, etc., to achieve the effect of easy large-scale production, large practical application value, and easy control of film thickness

Active Publication Date: 2016-07-06
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention provides a flexible perovskite thermal control film and its preparation method, which overcomes the defects of manganese oxide ceramic sheets, solves the problem of low-temperature preparation of perovskite thermal control films, and expands the range of manganese oxide thermal control. The large-area application of materials and the surface application of complex components improve the utilization of materials

Method used

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  • Flexible perovskite thermal-control film and preparation method thereof
  • Flexible perovskite thermal-control film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Step 1. Add 20 grams of nitric acid into 70 ml of deionized water, stir evenly at room temperature, then add 21.65 grams of lanthanum nitrate, 39.45 grams of neodymium nitrate, 12.7 grams of strontium nitrate, 71.58 grams of 50wt% manganese nitrate, and raise the temperature to 65 ℃ and stirred at a speed of 510r / min for 2.5 hours, added 0.48mol citric acid, and continued to stir for 3 hours to form a sol, added 11ml of ethylene glycol, continued to stir for 5 hours at the same speed and temperature, and stood at 65°C for 12 hours to obtain wet gel. Raise the wet gel placed in a high-temperature furnace to 420°C at a rate of 3.3°C / min and keep it warm for 3 hours. room temperature. Obtain the perovskite powder with a particle size of 150 nanometers through grinding or ball milling, figure 2 It shows that the main components of the perovskite powder in this embodiment are neodymium, strontium, manganese, and lanthanum.

[0023] Step 2. Add 10 grams of perovskite powd...

Embodiment 2

[0028] The first three steps of this embodiment are the same as in Embodiment 1, except for the fourth step.

[0029] The fourth step is: transfer the perovskite film sol obtained in the third step to a hard substrate with a temperature resistance of not less than 300° C., such as glass or silicon wafer. The cured film was obtained according to the stepwise temperature rise curing process described in step 4 in Example 1, and the cured film was peeled off from the hard substrate in ethanol or ethanol aqueous solution at 70°C and dried to obtain a flexible perovskite thermal control film. The emissivity at the temperature of 203K and 353K is 0.45 and 0.75 respectively, and the variation range of emissivity is 0.3.

Embodiment 3

[0031] The difference between this embodiment and Embodiment 1 lies in step one.

[0032] The first step is: 20 grams of nitric acid is added to 70 ml of deionized water, after stirring at room temperature, 34.64 grams of lanthanum nitrate, 26.3 grams of neodymium nitrate, 12.7 grams of strontium nitrate, 71.58 grams of 50wt% manganese nitrate are added successively, and the temperature is raised High to 65°C and stirred at 850r / min for 3 hours, added 0.48mol citric acid, and continued to stir for 4 hours to form a sol, added 15ml of ethylene glycol, continued to stir at the same speed and temperature for 5 hours, and stood at 65°C for 12 hour, a wet gel was obtained. Raise the wet gel placed in a high-temperature furnace to 550°C at a rate of 5°C / min and keep it warm for 3 hours. room temperature. The perovskite powder with a particle size of 400 nm is obtained by grinding or ball milling.

[0033] Others are the same as steps two to four in embodiment 1. The resulting fi...

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Abstract

The invention discloses a flexible perovskite thermal-control film and a preparation method thereof. The preparation method comprises the following steps: modifying manganese, strontium, neodymium and precursor powders with 3-aminopropyltriethoxy silane to obtain perovskite powder, adding 4,4'-diaminodiphenyl ether and the perovskite powder into dimethylacetamide at -10 to 0 DEG C, adding pyromellitic dianhydride while performing ultrasonic stirring, quickly stirring, and vacuumizing to obtain a sol; and transferring the obtained sol onto a substrate material, and carrying out gradient heating setting to obtain the set film. By using the 4,4'-diaminodiphenyl ether and pyromellitic dianhydride as the base materials, the high-temperature region emissivity of the perovskite-base flexible film is enhanced by 8%, thereby solving the problem of implementation defects in the manganese oxide ceramic sheet and the problem of low yield caused by the brittleness of the ceramic sheet. The method has the advantages of simple manufacturing technique, controllable film thickness and no restriction to specimen specifications, and can easily implement large-scale production and large-area application.

Description

technical field [0001] The invention relates to a flexible perovskite thermal control film and a preparation method thereof, belonging to the technical field of thermal radiation control. Background technique [0002] Rare earth manganese oxide materials doped with divalent alkaline earth metal elements have heat-induced changes in radiation characteristics. Under the condition of suitable doping concentration, the properties of manganese oxide materials will undergo ferromagnetic metal state-paramagnetic insulating state transition with temperature changes, and present unique optical, electrical and magnetic properties, and can be adjusted according to the temperature level of the system and equipment, Adjust its own radiation characteristics, control the radiation energy exchange between the system and equipment and the external environment, and realize the control and management of the temperature of the system and equipment, so that it has broad application prospects in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C01G45/12
CPCC01G45/12C04B35/016C04B2235/3213C04B2235/3224C04B2235/3227
Inventor 范德松李强宣益民
Owner NANJING UNIV OF SCI & TECH
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