多孔纳米复合材料中光子散射的三相框架
A three-phase framework for photon scattering in porous nanocomposites
- Purdue University（普渡大学）
- King Saud University（沙特国王大学）
- United States Naval Academy（美国海军学院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
针对多孔纳米复合材料光散射难以预测的问题，提出三相散射框架，明确考虑空气孔隙的散射贡献，实验验证了该框架能准确预测BaSO4和TiO2涂层的散射行为，显著降低误差，为设计高散射材料提供新原理。
AI中文摘要：
非均匀介质中的光散射支撑着广泛的自然现象和光学技术，但在多孔纳米复合材料中仍然难以理解。最先进的理论通常将这些材料视为由颗粒和基体组成的两相系统，忽略了多孔复合材料中固有存在的空气孔隙。在这里，我们通过实验确定了六种BaSO4-丙烯酸和TiO2-丙烯酸涂层的散射系数，这些涂层覆盖了不同的颗粒体积分数，并开发了一个明确考虑孔隙诱导散射的三相散射框架。通过将复合材料表示为两个耦合的散射子系统——颗粒-基体和颗粒-空气——该框架解决了理论与实验之间的差异：传统的两相模型显著低估了BaSO4涂层的散射，而高估了TiO2涂层的散射，而三相模型准确捕捉了观察到的趋势，并将平均绝对对数误差从0.667降低到0.379。该框架将空气孔隙确定为光学散射的一个基本且可独立控制的贡献者，为工程化高散射多孔纳米复合材料提供了新的物理见解和设计原则。
英文摘要：
Light scattering in heterogeneous media underpins a broad range of natural phenomena and optical technologies, yet remains difficult to understand in porous nanocomposites. State-of-the-art theories generally treat these materials as two-phase systems consisting of particles and a matrix, overlooking the air pores that are intrinsically present in porous composites. Here we experimentally determine the scattering coefficients of six BaSO4-acrylic and TiO2-acrylic coatings spanning a range of particle volume fractions and develop a three-phase scattering framework that explicitly accounts for pore-induced scattering. By representing the composite as two coupled scattering subsystems, particle-matrix and particle-air, the framework resolves discrepancies between theory and experiment: conventional two phase models substantially underpredict scattering in BaSO4 coatings while overpredicting scattering in TiO2 coatings, whereas the three-phase model accurately captures the observed trends and reduces the mean absolute logarithmic error from 0.667 to 0.379. This framework identifies air pores as a fundamental and independently controllable contributor to optical scattering, providing new physical insights and design principles for engineering highly scattering porous nanocomposites.
