Zheng Wenxiang, Zhang Niu, Murtaza Ghulam, Meng Zihui, Wu Lei, Qiu Lili
School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
Analysis & Testing Centre, Beijing Institute of Technology, Beijing 100081, People's Republic of China.
ACS Appl Mater Interfaces. 2024 Mar 13;16(10):13041-13051. doi: 10.1021/acsami.3c17566. Epub 2024 Feb 28.
Real-time sensing and monitoring of temperature are of great significance for assessing human health. The sensitivity and stability are inevitable issues for thermometers. In this study, a thermometer with the cylindrical thermochromic hydrogel was prepared for real-time visual monitoring of temperature, which had excellent temperature sensitivity, angle-independence axially, and environmental stability. The customization of their initial optical properties depended on the PMMA concentrations and the content of the hydrogel monomer. The glycerol introduced with solvent displacement formed hydrogen bonds with the hydrogel network, which stabilized their mechanical properties, and the reflection peak blue-shifted from 653 to 499 nm when tensile strain was 57.85%. At the same time, the environmental stability originated from the moisturizing properties of the glycerol, which enabled the hydrogel to reliably transmit the information on temperature into the air without losing moisture. The reflection peak of the cylindrical thermochromic hydrogel shifted from 657 to 455 nm when the temperature increased from 22 to 45 °C, which realized temperature visual monitoring in the full-color range. The temperature sensitivity of the glycerol─nonclose-packed photonic crystals remained stable for 1 month, which provided an optimal option for continuous visual temperature monitoring.
实时感测和监测温度对于评估人体健康具有重要意义。灵敏度和稳定性是温度计不可避免要面临的问题。在本研究中，制备了一种带有圆柱形热致变色水凝胶的温度计用于温度的实时视觉监测，该温度计具有出色的温度敏感性、轴向角度独立性和环境稳定性。其初始光学性质的定制取决于聚甲基丙烯酸甲酯（PMMA）的浓度和水凝胶单体的含量。通过溶剂置换引入的甘油与水凝胶网络形成氢键，稳定了其机械性能，当拉伸应变达到57.85%时，反射峰从653 nm蓝移至499 nm。同时，环境稳定性源于甘油的保湿特性，这使得水凝胶能够可靠地将温度信息传递到空气中而不失水分。当温度从22℃升高到45℃时，圆柱形热致变色水凝胶的反射峰从657 nm移至455 nm，实现了全彩范围的温度视觉监测。甘油-非密堆积光子晶体的温度敏感性在1个月内保持稳定，为连续视觉温度监测提供了最佳选择。
