Department of Anesthesiology, Pain and Perioperative Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China.
State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China.
J Colloid Interface Sci. 2020 Nov 15;580:573-582. doi: 10.1016/j.jcis.2020.07.067. Epub 2020 Jul 17.
Because of their flexible structure and adjustable color, structural colors with non-close-packed colloidal crystal arrays (NCCAs) have broad applications. However, most of these structural colors are limited by an approximate refractive index or high background scattering, and they present an unsatisfactory color that seriously hinders their practical application. Preparation of particles with a high refractive index or adsorption coefficient may be an effective approach to construct highly colorimetric NCCA structural colors in a nonaqueous solvent. The aim of this study was to explore the formation process of NCCA by the assembly of colloidal particles in a nonaqueous solvent, so as to fabricate NCCAs with a high refractive index and high adsorption.
An attempt was made to fabricate the NCCA structural color by dispersing the desired particles in a 2-hydroxyethyl methacrylate (HEMA) solvent. Surface-functionalized poly(methyl methacrylate) (PMMA) particles were developed by emulsifier-free emulsion polymerization. The formation of NCCA was studied by comparing the dispersion of three classes of surface-functionalization of colloidal particles in the HEMA solvent. The melanin-like particles with a high refractive index and a high adsorption coefficient were synthesized by doping polydopamine (PDA) into good surface-functionalization particles by emulsifier-free emulsion polymerization. A highly colorimetric poly(2-hydroxyethyl methacrylate) (pHEMA) optical film with NCCA was fabricated by dispersing the melanin-like particles in a pHEMA hydrogel.
PMMA-HEMA colloidal particles could successfully construct a NCCA structure in a nonaqueous HEMA solvent because of the solvation. Based on the "good particles," PMMA-HEMA-PDA colloidal particles, an initial 3-hydroxytyramine hydrochloride (DA·HCl) concentration of 1.926 mM was shown to significantly improve the colorimetric value of the final solidified NCCA hydrogel. These results provided an important reference for the construction of surfactant-free HEMA non-close-packed colloidal crystals. This highly colorimetric structurally colored hydrogel may be widely used in the design of a variety of colored intelligent sensors and soft devices.
由于其灵活的结构和可调节的颜色，具有非密堆积胶体晶体阵列（NCCA）的结构色具有广泛的应用。然而，这些结构色大多数受到近似折射率或高背景散射的限制，呈现出不理想的颜色，严重阻碍了它们的实际应用。制备具有高折射率或吸附系数的粒子可能是在非水溶剂中构建高比色 NCCA 结构色的有效方法。本研究旨在通过胶体粒子在非水溶剂中的组装来探索 NCCA 的形成过程，从而制备具有高折射率和高吸附系数的 NCCAs。
尝试通过将所需粒子分散在 2-羟乙基甲基丙烯酸酯（HEMA）溶剂中来制备 NCCA 结构色。通过无乳化剂乳液聚合制备了表面功能化的聚甲基丙烯酸甲酯（PMMA）粒子。通过比较三种不同的胶体粒子表面功能化在 HEMA 溶剂中的分散情况，研究了 NCCA 的形成。通过无乳化剂乳液聚合将聚多巴胺（PDA）掺杂到良好的表面功能化粒子中，合成了具有高折射率和高吸附系数的类黑色素粒子。通过将类黑色素粒子分散在 pHEMA 水凝胶中，制备了具有 NCCA 的高比色聚（2-羟乙基甲基丙烯酸酯）（pHEMA）光学膜。
由于溶剂化作用，PMMA-HEMA 胶体粒子可以成功地在非水 HEMA 溶剂中构建 NCCA 结构。基于“良好的粒子”，PMMA-HEMA-PDA 胶体粒子，初始 3-羟基邻苯二胺盐酸盐（DA·HCl）浓度为 1.926 mM 时，显著提高了最终固化 NCCA 水凝胶的比色值。这些结果为构建无表面活性剂的 HEMA 非密堆积胶体晶体提供了重要参考。这种高比色结构色水凝胶可能广泛应用于各种彩色智能传感器和软设备的设计。
