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Enhancing the Refractive Index of Polymers with a Plant-Based Pigment
Small ( IF 13.0 ) Pub Date : 2021-09-23 , DOI: 10.1002/smll.202103061
Mohammad Yasir 1 , Tianqi Sai 1 , Alba Sicher 1 , Frank Scheffold 2 , Ullrich Steiner 3 , Bodo D Wilts 3 , Eric R Dufresne 1
Affiliation  

Polymers are essential components of many nanostructured materials. However, the refractive indices of common polymers fall in a relatively narrow range between 1.4 and 1.6. Here, it is demonstrated that loading commercially-available polymers with large concentrations of a plant-based pigment can effectively enhance their refractive index. For polystyrene (PS) loaded with 67 w/w% β-carotene (BC), a peak value of 2.2 near the absorption edge at 531 nm is achieved, while maintaining values above 1.75 across longer wavelengths of the visible spectrum. Despite high pigment loadings, this blend maintains the thermoforming ability of PS, and BC remains molecularly dispersed. Similar results are demonstrated for the plant-derived polymer ethyl cellulose (EC). Since the refractive index enhancement is intimately connected to the introduction of strong absorption, it is best suited to applications where light travels short distances through the material, such as reflectors and nanophotonic systems. Enhanced reflectance from films is experimentally demonstrated, as large as sevenfold for EC at selected wavelengths. Theoretical calculations highlight that this simple strategy can significantly increase light scattering by nanoparticles and enhance the performance of Bragg reflectors.

中文翻译:

用植物基颜料提高聚合物的折射率

聚合物是许多纳米结构材料的重要组成部分。然而,普通聚合物的折射率落在 1.4 和 1.6 之间的相对较窄的范围内。在这里,证明了用大浓度的植物基颜料加载市售聚合物可以有效地提高它们的折射率。对于装载有 67 w/w% β-胡萝卜素 (BC) 的聚苯乙烯 (PS),在 531 nm 的吸收边缘附近实现了 2.2 的峰值,同时在可见光谱的较长波长上保持高于 1.75 的值。尽管颜料含量高,但这种混合物保持了 PS 的热成型能力,并且 BC 保持分子分散。植物衍生的聚合物乙基纤维素 (EC) 也得到了类似的结果。由于折射率增强与强吸收的引入密切相关,因此它最适合光短距离穿过材料的应用,例如反射器和纳米光子系统。实验证明了薄膜的增强反射率,在选定的波长下,EC 的反射率高达七倍。理论计算表明,这种简单的策略可以显着增加纳米粒子的光散射并增强布拉格反射器的性能。
更新日期:2021-11-04
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