info:eu-repo/semantics/article
Inversion of Elastic Light Scattering Measurements to Determine Refractive Index and Particle Size Distribution of Polymeric Emulsions
Fecha
2003-08-01Registro en:
Frontini, Gloria Lia; Fernandez Berdaguer, Elena Maria I.; Inversion of Elastic Light Scattering Measurements to Determine Refractive Index and Particle Size Distribution of Polymeric Emulsions; Taylor & Francis Ltd; Inverse Problems In Science And Engineering; 11; 4; 1-8-2003; 329-340
1068-2767
CONICET Digital
CONICET
Autor
Frontini, Gloria Lia
Fernandez Berdaguer, Elena Maria I.
Resumen
Polymeric emulsions are well characterized by the knowledge of their particle size distributions (PSD). Elasticlight-scattering (ELS) measurements can be inverted to estimate the PSD in the range from 50 nm up to several micrometers. The relative refractive index of the particles is required in computation procedures to obtain the PSD. Small differences in the assumed refractive index may cause significant differences in the resulting PSD. From the scattering data, the refractive index can be determined. In this article we present the corresponding technique. We consider polymeric emulsions where the nonabsorption assumption is reasonable. We propose a methodology based on Tikhonov regularization applied only to the distribution. However, we solve the minimization problem simultaneously with respect to the distribution and the refractive index. To select the regularization parameter, we include the Generalized Cross Validation (GCV) technique. From simulated ELS measurements we show that the problem is solved successfully.