Azo-based Photo-thermal Materials Based on Rapid Heat Release

Qing-hai Yan; Yi-yu Feng; Wei Feng

doi:10.11777/j.issn1000-3304.2019.19052

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Azo-based Photo-thermal Materials Based on Rapid Heat Release

Research Article | 更新时间：2021-01-26

- Azo-based Photo-thermal Materials Based on Rapid Heat Release
- Acta Polymerica Sinica Vol. 50, Issue 9, Pages: 925-931(2019)
- 作者机构：
  
  天津大学材料科学与工程学院　天津 300072
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2019.19052
  CLC：
- Published：2019-9，
  
  Published Online：10 May 2019，
  
  Received：18 March 2019，
  
  Revised：30 March 2019，
扫描看全文
Qing-hai Yan, Yi-yu Feng, Wei Feng. Azo-based Photo-thermal Materials Based on Rapid Heat Release. [J]. Acta Polymerica Sinica 50(9):925-931(2019)
DOI：

Qing-hai Yan, Yi-yu Feng, Wei Feng. Azo-based Photo-thermal Materials Based on Rapid Heat Release. [J]. Acta Polymerica Sinica 50(9):925-931(2019) DOI： 10.11777/j.issn1000-3304.2019.19052.

摘要

针对传统的偶氮储热材料仅能吸收紫外光，并且高储能密度的储热材料诱导放热温度高，放热速率低的问题，通过分子设计，在偶氮苯中引入具有吸电子性的噻唑杂环，与具有推电子性的甲氧基形成推拉电子结构. 推拉电子结构的杂环偶氮苯分子具有快速回复和吸收紫光的特点. 同时以石墨烯为模板制备储热复合材料，增加了分子间相互作用，从而使材料的储热密度达到了89 Wh/kg，半衰期为10 h，输出功率具有890 W/kg. 材料在435 nm波长处有最大的吸收强度，实现了对紫光区域的吸收. 该储热材料在60和80 °C的刺激下分别达到了2.6和3.8 °C的温差. 通过温度刺激，储热材料释放的热能够使2种热致变色颜料(62 °C下发生红色→无色，82 °C下发生蓝色→无色)分别在60和80 °C环境下发生明显的消色，通过不同温度刺激产生不同温差使得热致变色颜料发生颜色改变，实现了放热的可视化.

Abstract

Azobenzene (Azo) can absorb specific wavelength light that makes a change from

trans

-state to

cis

-state structure. Energy storage can be achieved by the difference in energy levels between the two isomers

so Azo is often used as energy storage materials. The conventional Azo photo-thermal storage materials have problems of relying on the utilization of ultraviolet light

requiring a high temperature stimulation

and a low-rate heat release. Herein

by utilizing diazonium salt method to introduce thiazole and methoxy groups into Azo to form a push-pull electronic structure

thiazole-heterocyclic Azo (t-Azo-h) achieves fast heat release. The photo-thermal storage composite (t-Azo-h/rGO) is obtained through grafting azo monomers onto the surface of reduced graphene oxide (rGO). Due to the close accumulation of Azo units on the surface of rGO

t-Azo-h/rGO of graphene-templated assembly increases the intermolecular interaction

resulting in an energy storage density of 89 Wh/kg

a half-life of 10 h

and a high power density of 890 W/kg at a heating rate of 5 °C/min. UV spectrum shows the maximum absorption intensity is at 435 nm

realizing absorption of the violet region because of molecular polarizability increased due to push-pull electronic properties. Red shift of spectral absorption broadens the use of sunlight. Owing to fast heat release

t-Azo-h/rGO reaches the temperature difference of 2.6 °C under 60 °C and 3.8 °C under 80 °C

respectively. By designing thermochromic pigment in combination with photo-thermal film

the decoloration occurs in two thermochromic pigments (red → colorless at 62 °C

blue → colorless at 82 °C) due to the heat release of photo-thermal material under heat stimulation. The t-Azo-h/rGO with fast heat release achieves the thermal visualization by optimizing stimulus. By designing push-pull electronic structure

a kind of photo-thermal material with fast thermal output is obtained and photo-thermal material with rapid heat release could finish a higher power density output at low temperature than that of slow heat release. At last

the thermal display with temperature response is realized by combining thermochromic pigments. Thermal display is expected to be applied in temperature supervisory and information encryption field.

关键词

杂环储热密度功率密度可视化推拉电子结构

Keywords

HeterocyclicHeat storage densityPower densityVisualizationPush-pull electronic structure

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Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, College of Materials Science and Engineering, Northeast Forestry University

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State Key Laboratory of Luminescent Materials and Devices, South China University of Technology

Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Resto-ration and Reconstruction, The Hong Kong University of Science & Technology

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