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Poly(4-vinylpyridine) and Poly(methacrylic acid) Particle Architectures for pH-Responsive and Mechanochromic Opal Films
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-02-13 , DOI: 10.1021/acsami.3c17974 Lukas Siegwardt 1 , Victoria Glößner 1 , Anna Boehm 1 , Marc Schneider 2 , Markus Gallei 1, 3
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-02-13 , DOI: 10.1021/acsami.3c17974 Lukas Siegwardt 1 , Victoria Glößner 1 , Anna Boehm 1 , Marc Schneider 2 , Markus Gallei 1, 3
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While stimuli-responsive structural colors are commonly found in nature, mimicking these in artificial materials is challenging. Dynamically switchable and tunable coloration, however, is in high demand in widespread fields of applications, including advanced display and monitoring technologies, smart sensing, and anticounterfeiting. This work reports a scalable protocol for the synthesis of tailor-made core–shell particles and subsequent processing to opal films with iridescent, pH-responsive, and mechanochromic structural color. Novel monodisperse core–shell architectures based on hard polystyrene core particles are synthesized via stepwise emulsion polymerization in a starved-feed mode. The incorporation of 4-vinylpyridine and methacrylic acid as functional comonomers in the soft particle shell facilitates pH-responsive swelling and deswelling. Mechanically stable and well-ordered colloidal crystal films are obtained by the self-assembly of the particles during processing with the powerful melt-shear organization technique. Thereby obtained opal films show Bragg-scattering at the colloidal crystalline structure and exhibit brilliant green-turquoise to blue-violet reflection colors, dependent on the angle of view and illumination. Upon changes in the pH value or mechanical deformation, the reflected wavelength shifts by more than 100 nm, leading to intriguing changes in the visible structural color. Excellent reversibility is achieved by the subsequent application of a convenient UV cross-linking strategy, corroborating the high application potential of these advanced functional materials.
中文翻译：
用于 pH 响应和力致变色蛋白石薄膜的聚（4-乙烯基吡啶）和聚（甲基丙烯酸）颗粒结构
虽然刺激响应结构色在自然界中很常见，但在人造材料中模仿这些结构色具有挑战性。然而，在先进的显示和监控技术、智能传感和防伪等广泛的应用领域中，对动态可切换和可调谐的着色的需求很高。这项工作报告了一种可扩展的方案，用于合成定制的核壳颗粒，并随后加工成具有虹彩、pH 响应和机械致变色结构颜色的蛋白石薄膜。基于硬质聚苯乙烯核颗粒的新型单分散核壳结构是通过饥饿进料模式的逐步乳液聚合合成的。在软颗粒壳中加入 4-乙烯基吡啶和甲基丙烯酸作为功能性共聚单体，有利于 pH 响应性溶胀和消溶胀。利用强大的熔体剪切组织技术，通过颗粒在加工过程中的自组装，获得机械稳定且有序的胶体晶体薄膜。由此获得的蛋白石膜在胶体晶体结构处表现出布拉格散射，并表现出明亮的绿-绿松石色至蓝-紫色反射颜色，这取决于视角和照明。当 pH 值或机械变形发生变化时，反射波长会发生 100 nm 以上的变化，从而导致可见结构颜色发生有趣的变化。通过随后应用方便的紫外交联策略实现了优异的可逆性，证实了这些先进功能材料的高应用潜力。
更新日期：2024-02-13
中文翻译：
用于 pH 响应和力致变色蛋白石薄膜的聚（4-乙烯基吡啶）和聚（甲基丙烯酸）颗粒结构
虽然刺激响应结构色在自然界中很常见，但在人造材料中模仿这些结构色具有挑战性。然而，在先进的显示和监控技术、智能传感和防伪等广泛的应用领域中，对动态可切换和可调谐的着色的需求很高。这项工作报告了一种可扩展的方案，用于合成定制的核壳颗粒，并随后加工成具有虹彩、pH 响应和机械致变色结构颜色的蛋白石薄膜。基于硬质聚苯乙烯核颗粒的新型单分散核壳结构是通过饥饿进料模式的逐步乳液聚合合成的。在软颗粒壳中加入 4-乙烯基吡啶和甲基丙烯酸作为功能性共聚单体，有利于 pH 响应性溶胀和消溶胀。利用强大的熔体剪切组织技术，通过颗粒在加工过程中的自组装，获得机械稳定且有序的胶体晶体薄膜。由此获得的蛋白石膜在胶体晶体结构处表现出布拉格散射，并表现出明亮的绿-绿松石色至蓝-紫色反射颜色，这取决于视角和照明。当 pH 值或机械变形发生变化时，反射波长会发生 100 nm 以上的变化，从而导致可见结构颜色发生有趣的变化。通过随后应用方便的紫外交联策略实现了优异的可逆性，证实了这些先进功能材料的高应用潜力。
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