Control of Structural Coloration by Natural Sunlight Irradiation on a Melanin Precursor Polymer Inspired by Skin Tanning.
Control of Structural Coloration by Natural Sunlight Irradiation on a Melanin Precursor Polymer Inspired by Skin Tanning.
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DOI：
10.1021/acs.biomac.1c00161
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发表时间：
2021-03
影响因子：
6.2
通讯作者：
Taku Okoshi;Takeshi Iwasaki;S. Takahashi;Y. Iwasaki;K. Kishikawa;Michinari Kohri
中科院分区：
文献类型：
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作者：
Taku Okoshi;Takeshi Iwasaki;S. Takahashi;Y. Iwasaki;K. Kishikawa;Michinari Kohri
天然黑色素影响光的反射和吸收，是自然界产生明亮结构色的重要元素。在本研究中，我们以黑色素前体聚合物聚酪氨酸（PTy）为壳层，在氧化铈（CeO2）核粒子存在下，通过酪氨酸乙酯（Ty）的氧化聚合，制备了核-壳粒子。受皮肤晒黑的启发，用紫外线或自然阳光照射CeO2@PTy核壳粒子，通过延长PTy的π共轭长度，产生具有吸收光能力的胶体粒子，引起黑化。由CeO2@PTy颗粒组成的颗粒样品由于多次散射光而呈现白色。相比之下，CeO2@PTy UV或CeO2@PTy Sun颗粒在光照射后的光吸收能力抑制了散射光，显著提高了由这些颗粒制成的颗粒样品的结构颜色的可见性。因此，我们开发了一种新的方法，通过光照射黑色素前体聚合物来控制人眼对结构颜色的可视化。
Natural melanin affects the reflection and absorption of light, and it is known as an important element in producing bright structural colors in nature. In this study, we prepared core-shell particles using a melanin precursor polymer, that is, polytyrosine (PTy), as a shell layer by the oxidative polymerization of tyrosine ethyl ester (Ty) in the presence of cerium oxide (CeO2) core particles. Inspired by skin tanning, irradiating the CeO2@PTy core-shell particles with UV or natural sunlight caused melanization by extending the π-conjugated length of PTy, producing colloidal particles with the ability to absorb light. The pellet samples consisting of CeO2@PTy particles appeared whitish because of multiple scattered light. In contrast, the light absorption capacity of CeO2@PTy UV or CeO2@PTy Sun particles after light irradiation suppressed scattered light, dramatically improving the visibility of the structural color of the pellet samples made from these particles. Thus, a new method has been developed to control the visualization of structural colors to the human eye by irradiating the melanin precursor polymer with light.