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Multiresponsive Photonic Microspheres Formed by Hierarchical Assembly of Colloidal Nanogels for Colorimetric Sensors
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-03-31 , DOI: 10.1021/acsanm.0c03150 Golnaz Isapour 1 , Marco Lattuada 2
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-03-31 , DOI: 10.1021/acsanm.0c03150 Golnaz Isapour 1 , Marco Lattuada 2
Affiliation
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Soft photonic materials formed from nanoscale colloidal crystals are versatile platforms for sensing and signaling in biomedical, chemical, and mechanical application scenarios. A particularly leveraged attribute of such materials is structural coloration; when applied in reconfigurable systems, dynamic coloration can be achieved, akin to the ability of chameleons to change their color appearance through nanocrystal structures beneath their skin. To date, many hybrid photonic materials composed of hard, passive, and soft adaptable systems have been explored for their dynamic color-changing performance; however, a lack of multifunctional and fully adaptable systems with sufficient control of properties on nanoscale persists. In addition, in hybrid systems with multiple stimuli-responsive components, interactions among components tend to be overlooked. Here, we propose a facile and scalable method to prepare multiresponsive photonic materials composed of soft and adaptable components, to tune the structural coloration over the entire visible spectral range. Temperature-responsive hydrogel microspheres of diameters of several tens of microns host an array of pH-responsive colloidal nanogels; the hierarchical assembly of nanogels scaffolded within the hydrogel microspheres form soft photonic microspheres that display a dynamic color change spanning the entire visible spectral range, through a variation in pH or temperature. pH change triggers a volume change in the nanogels, as does temperature change in the scaffolding hydrogel. A model predicting the equilibrium sizes of the microspheres as a function of temperature and pH has been proposed and validated. We also discuss the mutual interactions between the colloidal nanogels and the scaffolding hydrogel. These photonic microspheres could be applied as optically interrogated sentinels in label-free multiplexed chemical, thermal, and mechanical sensing with sub-millimeter resolution.
中文翻译：
用于色度传感器的胶体纳米凝胶的分级组装形成的多响应光子微球。
由纳米级胶体晶体形成的软光子材料是在生物医学，化学和机械应用场景中传感和发出信号的多功能平台。这种材料的特别利用的属性是结构着色。当应用于可重构系统中时，可以实现动态着色，类似于变色龙通过其皮肤下的纳米晶体结构改变其颜色外观的能力。迄今为止，已经探索了许多由硬，被动和软适应系统组成的混合光子材料的动态变色性能。然而，仍然缺乏在纳米级上充分控制性质的多功能和完全适应性系统。此外，在具有多个刺激响应组件的混合系统中，组件之间的相互作用往往被忽略。在这里，我们提出了一种简便且可扩展的方法来制备由柔软且适应性强的成分组成的多响应光子材料，以在整个可见光谱范围内调整结构色。直径为数十微米的温度响应水凝胶微球具有一系列pH响应胶体纳米凝胶。在水凝胶微球中形成支架的纳米凝胶的分级组装形成了软的光子微球，该软光子微球通过pH或温度的变化在整个可见光谱范围内显示出动态的颜色变化。pH值的变化会触发纳米凝胶的体积变化，支架水凝胶的温度也会变化。已经提出并验证了预测微球平衡大小随温度和pH变化的模型。我们还讨论了胶体纳米凝胶和脚手架水凝胶之间的相互作用。这些光子微球可以作为光学询问的前哨，应用于无毫米级亚毫米分辨率的无标记多路复用化学，热和机械感测中。
更新日期：2021-04-23
中文翻译：
用于色度传感器的胶体纳米凝胶的分级组装形成的多响应光子微球。
由纳米级胶体晶体形成的软光子材料是在生物医学，化学和机械应用场景中传感和发出信号的多功能平台。这种材料的特别利用的属性是结构着色。当应用于可重构系统中时，可以实现动态着色，类似于变色龙通过其皮肤下的纳米晶体结构改变其颜色外观的能力。迄今为止，已经探索了许多由硬，被动和软适应系统组成的混合光子材料的动态变色性能。然而，仍然缺乏在纳米级上充分控制性质的多功能和完全适应性系统。此外，在具有多个刺激响应组件的混合系统中，组件之间的相互作用往往被忽略。在这里，我们提出了一种简便且可扩展的方法来制备由柔软且适应性强的成分组成的多响应光子材料，以在整个可见光谱范围内调整结构色。直径为数十微米的温度响应水凝胶微球具有一系列pH响应胶体纳米凝胶。在水凝胶微球中形成支架的纳米凝胶的分级组装形成了软的光子微球，该软光子微球通过pH或温度的变化在整个可见光谱范围内显示出动态的颜色变化。pH值的变化会触发纳米凝胶的体积变化，支架水凝胶的温度也会变化。已经提出并验证了预测微球平衡大小随温度和pH变化的模型。我们还讨论了胶体纳米凝胶和脚手架水凝胶之间的相互作用。这些光子微球可以作为光学询问的前哨，应用于无毫米级亚毫米分辨率的无标记多路复用化学，热和机械感测中。
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