Torres Leopoldo, Margaronis Artemis, Bellato Meinhardt Bianca M, Granzow Lily, Ayyub Omar B, Kofinas Peter
Fischell Department of Bioengineering , University of Maryland , Room 3102 A, James Clark Hall, 8278 Paint Branch Drive , College Park , Maryland 20742 , United States.
Department of Chemical and Biomolecular Engineering , University of Maryland , 4418 Stadium Drive , College Park , Maryland 20742 , United States.
Langmuir. 2020 Feb 11;36(5):1252-1257. doi: 10.1021/acs.langmuir.9b03516. Epub 2020 Jan 29.
The assembly of monodisperse particles into colloidal arrays that diffract visible light through constructive interference is of considerable interest due to their resilience against color fading. In particular, noniridescent structurally colored materials are promising as a means of coloration for paints, inks, cosmetics, and displays because their color is angle independent. A rapid and tunable assembly method for producing noniridescent structurally colored colloidal-based materials that are pliable after fabrication is described. Structurally colored particle arrays were fabricated by centrifuging highly charged silica particles suspended in deionized water. By tuning the particle diameter, the colors displayed by the arrays spanned the visible spectrum while retaining angle-independent structural color. The color of centrifuged colloids of a single particle diameter was precisely controlled within 50 nm by modulating the particle concentration. The peak wavelength diffracted by the material was further tuned by altering the centrifugal rate and assembly time. Centrifugation assembly of particles in a polymer solution also produces noniridescent colloidal films, and the control of their color is reported. Together, these results offer design considerations for the centrifugation-based assembly of colloidal films with tunable structural color that are transferable after fabrication and are angle independent.
将单分散颗粒组装成通过相长干涉衍射可见光的胶体阵列，因其抗褪色能力而备受关注。特别是，非虹彩结构色材料有望作为涂料、油墨、化妆品和显示器的着色手段，因为它们的颜色与角度无关。本文描述了一种快速且可调的组装方法，用于生产在制造后具有柔韧性的非虹彩结构色胶体基材料。通过离心悬浮在去离子水中的高电荷二氧化硅颗粒来制造结构色颗粒阵列。通过调节颗粒直径，阵列显示的颜色跨越可见光谱，同时保持与角度无关的结构色。通过调节颗粒浓度，可将单一直径的离心胶体的颜色精确控制在50纳米以内。通过改变离心速率和组装时间，可进一步调节材料衍射的峰值波长。在聚合物溶液中对颗粒进行离心组装也能产生非虹彩胶体薄膜，并报道了对其颜色的控制。总之，这些结果为基于离心的可调结构色胶体薄膜组装提供了设计思路，这些薄膜在制造后可转移且与角度无关。
