Multi-stimuli-responsive hydrogels for pH detection and switchable color changing applications

IF 4.2 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-05-21 DOI:10.1016/j.dyepig.2025.112903

Baoli Chen , Yanxi Song , Zirun Zhan , Jiarui Yang , Zhaofeng Zheng , Hongqi Li

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引用次数: 0

Abstract

Convenient preparation of smart hydrogels that can respond to multiple external stimuli is of great significance to both life science and material science and remains a challenge. This study proposed a simple free radical polymerization method by using a new N-allyl spiropyran, N-isopropylacrylamide (NIPAAm) and acrylic acid (AA) as monomers to prepare multi-responsive hydrogels with anti-freezing feature. The new spiropyran monomer was photochromic and solvatochromic and could be used to distinguish common organic solvents by the naked eye. Hydrogels based on the copolymer p(NIPAAm-co-SP) prepared from the spiropyran and NIPAAm exhibited multiple photo-switchable color changing patterns, providing potential for applications in advanced information encryption, anti-counterfeiting, self-erasing and display/storage devices. Both the spiropyran monomer and p(NIPAAm-co-SP) hydrogels displayed pH-responsive behavior and could be used as a convenient colorimetric pH sensor for rapid detection and monitoring of multiple pH scales of pH 1.0–3.0, 4.0, 5.0–11.0 and 12.0–13.0. The temperature-responsive color change of the hydrogels based on the terpolymer p(NIPAAm-co-SP-co-AA) could be tuned effectively by adjusting the polymerization solvent and AA content. The study contributed a new strategy for construction of multi-responsive hydrogels with potential applications in the fields of photoswitches, environmental monitoring, and smart materials.

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用于pH检测和可切换颜色变化应用的多刺激响应水凝胶

方便地制备能够响应多种外界刺激的智能水凝胶对生命科学和材料科学都具有重要意义，也是一个挑战。本研究提出了以新型n -烯丙基螺吡喃、n -异丙基丙烯酰胺（NIPAAm）和丙烯酸（AA）为单体，采用简单的自由基聚合法制备具有抗冻特性的多响应水凝胶的方法。新的螺吡喃单体具有光致变色和溶剂致变色两种特性，可用于肉眼识别常见的有机溶剂。以螺吡喃和NIPAAm为原料制备的共聚物p（NIPAAm-co- sp）为基础的水凝胶具有多种可光切换的变色模式，在高级信息加密、防伪、自擦除和显示/存储设备等方面具有潜在的应用前景。螺吡喃单体和p（NIPAAm-co-SP）水凝胶均表现出pH响应行为，可作为一种便捷的比色pH传感器，用于pH 1.0-3.0、4.0、5.0-11.0和12.0-13.0多个pH范围的快速检测和监测。三元共聚物p（NIPAAm-co-SP-co-AA）的温度响应性颜色变化可以通过调节聚合溶剂和AA含量来有效调节。该研究为构建多响应水凝胶提供了一种新的策略，在光开关、环境监测和智能材料等领域具有潜在的应用前景。

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.