将光酸嵌入聚合物蛋白石结构中：对光学和刺激响应特性的协同效应。
Embedding Photoacids into Polymer Opal Structures: Synergistic Effects on Optical and Stimuli-Responsive Features.
机构信息
Polymer Chemistry, Saarland University, Campus Saarbrücken C4 2, 66123 Saarbrücken, Germany.
Biophysical Chemistry, Saarland University, Campus B2 2, 66123 Saarbrücken, Germany.
出版信息
Molecules. 2021 Dec 3;26(23):7350. doi: 10.3390/molecules26237350.
Opal films with their vivid structural colors represent a field of tremendous interest and obtained materials offer the possibility for many applications, such as optical sensors or anti-counterfeiting materials. A convenient method for the generation of opal structures relies on the tailored design of core-interlayer-shell (CIS) particles. Within the present study, elastomeric opal films were combined with stimuli-responsive photoacids to further influence the optical properties of structurally colored materials. Starting from cross-linked polystyrene (PS) core particles featuring a hydroxy-rich and polar soft shell, opal films were prepared by application of the melt-shear organization technique. The photoacid tris(2,2,2-trifluoroethyl) 8-hydroxypyrene-1,3,6-trisulfonate (TFEHTS) could be conveniently incorporated during freeze-drying the particle dispersion and prior to the melt-shear organization. Furthermore, the polar opal matrix featuring hydroxylic moieties enabled excited-state proton transfer (ESPT), which is proved by spectroscopic evaluation. Finally, the influence of the photoacid on the optical properties of the 3-dimensional colloidal crystals were investigated within different experimental conditions. The angle dependence of the emission spectra unambiguously shows the selective suppression of the photoacid's fluorescence in its deprotonated state.
蛋白石薄膜因其生动的结构色而备受关注，所获得的材料为许多应用提供了可能性，例如光学传感器或防伪材料。一种方便的产生蛋白石结构的方法依赖于核-层-壳（CIS）粒子的定制设计。在本研究中，弹性蛋白石薄膜与响应性光酸结合，以进一步影响结构色材料的光学性质。从具有富含羟基和极性软壳的交联聚苯乙烯（PS）核颗粒开始，通过应用熔融剪切组织技术制备蛋白石薄膜。光酸三（2,2,2-三氟乙基）8-羟基芘-1,3,6-三磺酸盐（TFEHTS）可以在冷冻干燥颗粒分散体期间以及在熔融剪切组织之前方便地掺入。此外，具有羟基部分的极性蛋白石基质能够进行激发态质子转移（ESPT），这通过光谱评估得到了证明。最后，在不同的实验条件下研究了光酸对三维胶体晶体光学性质的影响。发射光谱的角度依赖性明确显示了在去质子化状态下光酸荧光的选择性抑制。
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