A new RRS method for measurement of temperature with magnetic-liquid crystal nanosurface molecularly imprinted polymer probe

IF 4.3 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-12-15 DOI:10.1016/j.saa.2024.125597

Zhuxin Chen , Chenguang Yi , Chongning Li , Aihui Liang , Guiqing Wen , Zhiliang Jiang

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引用次数: 0

Abstract

A new magnetic-liquid crystal nanosurface molecularly imprinted polymer (5CB-Fe₃O₄@MIP) resonance Rayleigh scattering temperature sensor was prepared, using liquid crystal 4′-cyano-4′-pentylbiphenyl as the temperature sensing element, nano-Fe₃O₄ as the substrate, methacrylic acid as the functional monomer and ethylene glycol dimethacrylate as the crosslinking agent. It was characterized by molecular spectroscopy, scanning electron microscopy and Fourier transform infrared spectroscopy. The thermosensitive effect of 11 liquid crystals, that is, the relationship between RRS and temperature, was studied. The 4′-cyano-4′-pentylbiphenyl exhibits best sensitive. The 5CB-Fe₃O₄@MIP temperature sensor had a strong resonance Rayleigh scattering peak at 370 nm. The resonance Rayleigh scattering intensity increased with the increase of temperature, and showed a good linear relationship. The temperature range of measurement was 30–95 °C, with a slope of 16.8 a.u./°C. And by optimizing the preparation conditions of molecularly imprinted polymers, the best preparation conditions were obtained: template molecule: 0.25 mmol, functional monomer: 2.5 mmol, cross-linker: 5 mmol, reaction temperature: 70 °C, reaction time: 2.5 h. As a comparison, we also studied the effect of Fe₃O₄ with different particle sizes on the 5CB-Fe₃O₄@MIP temperature sensor. At the same time, the temperature sensor is applied to the temperature measurement of cooling water, which is effective.

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磁液晶纳米表面分子印迹聚合物探针测量温度的RRS新方法。

以4′-氰基-4′-戊基联苯液晶为感温元件，纳米fe3o4为底物，甲基丙烯酸为功能单体，乙二醇二甲基丙烯酸酯为交联剂，制备了一种新型磁液晶纳米表面分子印迹聚合物（5CB-Fe3O4@MIP）共振瑞利散射温度传感器。用分子光谱、扫描电镜和傅里叶变换红外光谱对其进行了表征。研究了11种液晶的热敏效应，即RRS与温度的关系。4′-氰基-4′-戊基联苯灵敏度最高。5CB-Fe3O4@MIP温度传感器在370 nm处有较强的共振瑞利散射峰。共振瑞利散射强度随温度的升高而增大，并呈良好的线性关系。测量温度范围为30 ~ 95℃，斜率为16.8 a.u./℃。通过优化分子印迹聚合物的制备条件，得到了最佳的制备条件：模板分子：0.25 mmol，功能单体：2.5 mmol，交联剂：5 mmol，反应温度：70℃，反应时间：2.5 h。作为对比，我们还研究了不同粒径Fe3O4对5CB-Fe3O4@MIP温度传感器的影响。同时将温度传感器应用于冷却水的温度测量，效果显著。

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来源期刊

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 物理-光谱学

CiteScore

8.40

自引率

11.40%

发文量

1364

审稿时长

40 days

期刊介绍： Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (SAA) is an interdisciplinary journal which spans from basic to applied aspects of optical spectroscopy in chemistry, medicine, biology, and materials science. The journal publishes original scientific papers that feature high-quality spectroscopic data and analysis. From the broad range of optical spectroscopies, the emphasis is on electronic, vibrational or rotational spectra of molecules, rather than on spectroscopy based on magnetic moments. Criteria for publication in SAA are novelty, uniqueness, and outstanding quality. Routine applications of spectroscopic techniques and computational methods are not appropriate. Topics of particular interest of Spectrochimica Acta Part A include, but are not limited to: Spectroscopy and dynamics of bioanalytical, biomedical, environmental, and atmospheric sciences, Novel experimental techniques or instrumentation for molecular spectroscopy, Novel theoretical and computational methods, Novel applications in photochemistry and photobiology, Novel interpretational approaches as well as advances in data analysis based on electronic or vibrational spectroscopy.