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Low-temperature reversible thermochromic crystal material as well as preparation method and application thereof

A crystal material and thermochromic technology, which is applied in the direction of color-changing fluorescent materials, polycrystalline material growth, crystal growth, etc., can solve the problems of low color-changing accuracy at room temperature, long recoloring time, small color-changing color difference, etc., and achieve simple process , simple method and low production cost

Inactive Publication Date: 2018-06-01
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patented technology relates to an improved way to create stable and long lastingly changing colors on heat sensitive devices that can be used with different types of fluids without losing their original properties overtime.

Problems solved by technology

Technological Problem addressed in this patents relating to thermochrome effectiveness and reversability for various applications including biology, chemistry, medicine, security features, imagery production, electronic communication devices, display technologies, and others. Current methods involve changing structures called chelants or ion exchange resins, but these techniques require complicated procedures involving multiple steps and may result in reduced precision and slow response times over traditional ways like melting transition temperatures.

Method used

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  • Low-temperature reversible thermochromic crystal material as well as preparation method and application thereof
  • Low-temperature reversible thermochromic crystal material as well as preparation method and application thereof
  • Low-temperature reversible thermochromic crystal material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0035] Example 1 sample preparation

[0036] Mix the zinc source, media yellow 10 and water according to a certain ratio to obtain the initial gel mixture, seal the initial gel mixture in a 30mL polytetrafluoroethylene-lined hydrothermal reaction kettle, put it into a box-type resistance furnace, After crystallization at the crystallization temperature for a period of time, after filtration, washing, and drying, yellow flake [ZnNa 2 (C 13 h 8 N 2 o 6 S) 4 (H 2 O) 12 ]·[Zn(H 2 O) 6 ]·(H 2 O) 12 crystal sample. Table 1 shows the relationship between the types and ratios of raw materials in the initial gel mixture, crystallization temperature, crystallization time, and sample numbers.

[0037] Table 1 Relationship between sample synthesis conditions and sample numbers

[0038]

Embodiment 2

[0039] The crystal structure analysis of embodiment 2 sample

[0040] The structures of samples 1# to 9# were analyzed by single crystal X-ray diffraction and powder X-ray diffraction.

[0041] The single crystal X-ray diffraction was performed on a Rigaku Mercury CCD type X-ray single crystal diffractometer from Bruker, Germany. The crystal size is 0.12×0.10×0.12mm 3 ; The data collection temperature is 293K, and the diffraction light source is the Mo-Kα ray (λ=0.71073 ), the scanning mode is ω-2θ; the data is processed by the Multi-Scan method for absorption correction. Structural analysis was completed using the SHELXTL-97 program package; the position of the heavy atom was determined by the direct method, and the coordinates of the remaining atoms were obtained by the difference Fourier synthesis method; 2 The full-matrix least-squares method was used to refine all atomic coordinates and anisotropic thermal parameters.

[0042] Powder X-ray diffraction was carried out...

Embodiment 3

[0051] Embodiment 3 reversible discoloration experiment and result

[0052] Take an appropriate amount of sample 1# material, place it evenly in a watch glass, heat it in an oven at different temperatures, observe the color change of the sample, and record the color change time; take out the watch glass, observe the recolor change in the air, and record the recolor time. The discoloration performance of the low-temperature reversible thermochromic material was tested, and the results are shown in Table 1.

[0053] serial number

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Abstract

The invention discloses a low-temperature reversible thermochromic crystal material as well as a preparation method and the application thereof. The crystal material has a chemical formula of [ZnNa2(Cl3H8N2O6S)4(H2O)12].[Zn(H2O)6].(H2O)12, belongs to a triclinic crystal system and has a space group of P-1 and crystal cell parameter shown in the Specification. The crystal material is prepared by adopting a one-step hydrothermal method or a volatilization method and is simple in process, high in yield, less in environmental pollution and low in production cost; the prepared material has reversible thermochromic properties, has the characteristics of being quick in discoloration, low in temperature, short in response time, highly-recyclable and the like and has a wide application prospect inthe fields of sensors, hygrometers, indicators, temperature-indicating materials, paints, anti-counterfeit, printing, textiles and the like.

Description

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Claims

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Application Information

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Owner JIANGNAN UNIV
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