Morales-Luna Gesuri, Contreras-Tello Humberto, García-Valenzuela Augusto, Barrera Rubén G
Instituto de Fı́sica, Universidad Nacional Autónoma de México , Apartado Postal 20-364, Distrito Federal 01000, México.
Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México , Apartado Postal 70-186, Distrito Federal 04510, México.
J Phys Chem B. 2016 Jan 28;120(3):583-95. doi: 10.1021/acs.jpcb.5b10814. Epub 2016 Jan 19.
We compare light reflectivity measurements as a function of the angle of incidence for an interface between an optical glass and a turbid suspension of small particles, with theoretical predictions for the coherent reflectance calculated with different available theoretical models. The comparisons are made only in a small range of angles of incidence around the critical angle of the interface between the glass and the matrix of the colloidal suspensions. The experimental setup and its calibration procedure are discussed. We considered two Fresnel-based approximations and another two based on a multiple-scattering approach, and we present results for monodisperse latex colloidal suspensions of polymeric spherical particles in water with particle diameters of 120 and 520 nm, polydisperse titanium dioxide (rutile) particles suspensions in water with a most probable diameter of 404 nm, and suspensions of copper particles in water with diameters of 500 nm. The comparisons between experiment and theory are made without fitting any parameters.
我们将光学玻璃与小颗粒浑浊悬浮液之间界面的光反射率测量值作为入射角的函数进行比较，并与使用不同现有理论模型计算的相干反射率的理论预测值进行比较。比较仅在玻璃与胶体悬浮液基质之间界面的临界角附近的小入射角范围内进行。讨论了实验装置及其校准程序。我们考虑了两种基于菲涅耳的近似方法和另外两种基于多重散射方法的方法，并给出了水中粒径为120和520nm的聚合物球形颗粒的单分散乳胶胶体悬浮液、最可能直径为404nm的多分散二氧化钛（金红石）颗粒在水中的悬浮液以及直径为500nm的铜颗粒在水中的悬浮液的结果。实验与理论之间的比较是在不拟合任何参数的情况下进行的。
