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Optical Chemosensors based on Spiropyran-Doped Polymer Nanoparticles for Sensing pH of Aqueous Media
Langmuir ( IF 3.7 ) Pub Date : 2022-07-23 , DOI: 10.1021/acs.langmuir.2c01389 Milad Babazadeh-Mamaqani 1 , Hossein Roghani-Mamaqani 1, 2 , Amin Abdollahi 3 , Mehdi Salami-Kalajahi 1, 2
Langmuir ( IF 3.7 ) Pub Date : 2022-07-23 , DOI: 10.1021/acs.langmuir.2c01389 Milad Babazadeh-Mamaqani 1 , Hossein Roghani-Mamaqani 1, 2 , Amin Abdollahi 3 , Mehdi Salami-Kalajahi 1, 2
Affiliation
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Photochromic polymers, which are prepared by the incorporation of photochromic compounds into polymer matrices, show fluorescence emission along with color change under UV light irradiation. Polymer nanoparticles yield high chromic properties at low chromophore loadings, as they have a large surface area to absorb a high level of light irradiation. Particle size is a significant parameter to control optical properties, where the decrease of particle size results in a high light absorption and efficiency of photochromism and fluorescence emission. Reverse atom transfer radical polymerization was used to synthesize methyl methacrylate homopolymer and its copolymers with different comonomers to yield polymers with a narrow molecular weight distribution. Spiropyran was doped to the polymeric nanoparticles during nanoprecipitation to yield photochromic polymer nanoparticles. Particle size below 100 nm for the photochromic nanoparticles was shown by dynamic light scattering. Morphology investigation with microscopic analysis showed spherical morphology for nanoparticles. The photochromic properties of the polymer nanocarriers were studied in both acidic and alkaline media. The results indicated that the pH of the media as well as the copolymer composition significantly affect the optical properties. Therefore, the photochromic polymer nanoparticles could have potential applications as optical pH chemosensors by colorimetric and fluorometric detection mechanisms. The nanoparticles with hydroxyl- or amine-functional groups were shown to be highly efficient for pH chemosensor applications. Finally, photochromic cellulosic papers prepared from the photochromic polymer nanoparticles were highly applicable in the detection of acid vapors.
中文翻译：
基于螺吡喃掺杂聚合物纳米粒子的光学化学传感器用于传感水介质的 pH 值
通过将光致变色化合物掺入聚合物基质中制备的光致变色聚合物在紫外光照射下显示荧光发射和颜色变化。聚合物纳米粒子在低发色团负载下产生高铬特性，因为它们具有大表面积以吸收高水平的光照射。粒度是控制光学性质的重要参数，其中粒度的减小导致高的光吸收和光致变色和荧光发射的效率。反向原子转移自由基聚合用于合成甲基丙烯酸甲酯均聚物及其与不同共聚单体的共聚物，得到分子量分布窄的聚合物。在纳米沉淀过程中将螺吡喃掺杂到聚合物纳米颗粒中以产生光致变色聚合物纳米颗粒。动态光散射显示光致变色纳米粒子的粒径低于 100 nm。用显微分析进行的形态学研究显示纳米粒子的球形形态。在酸性和碱性介质中研究了聚合物纳米载体的光致变色特性。结果表明，介质的 pH 值以及共聚物组成显着影响光学性能。因此，通过比色和荧光检测机制，光致变色聚合物纳米粒子可能具有作为光学 pH 化学传感器的潜在应用。具有羟基或胺官能团的纳米颗粒被证明对 pH 化学传感器应用非常有效。最后，
更新日期：2022-07-23
中文翻译：
基于螺吡喃掺杂聚合物纳米粒子的光学化学传感器用于传感水介质的 pH 值
通过将光致变色化合物掺入聚合物基质中制备的光致变色聚合物在紫外光照射下显示荧光发射和颜色变化。聚合物纳米粒子在低发色团负载下产生高铬特性，因为它们具有大表面积以吸收高水平的光照射。粒度是控制光学性质的重要参数，其中粒度的减小导致高的光吸收和光致变色和荧光发射的效率。反向原子转移自由基聚合用于合成甲基丙烯酸甲酯均聚物及其与不同共聚单体的共聚物，得到分子量分布窄的聚合物。在纳米沉淀过程中将螺吡喃掺杂到聚合物纳米颗粒中以产生光致变色聚合物纳米颗粒。动态光散射显示光致变色纳米粒子的粒径低于 100 nm。用显微分析进行的形态学研究显示纳米粒子的球形形态。在酸性和碱性介质中研究了聚合物纳米载体的光致变色特性。结果表明，介质的 pH 值以及共聚物组成显着影响光学性能。因此，通过比色和荧光检测机制，光致变色聚合物纳米粒子可能具有作为光学 pH 化学传感器的潜在应用。具有羟基或胺官能团的纳米颗粒被证明对 pH 化学传感器应用非常有效。最后，
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