We implemented the heterodyne near-field scattering (HNFS) technique [D. Brogioli et al., Appl. Phys. Lett. 81, 4109 (2002)], showing that it is a fairly valid alternative to traditional elastic low-angle light scattering and quite suitable for studying complex fluids such as colloidal systems. With respect to the original work, we adopted a different data reduction scheme, which allowed us to improve significantly the performance of the technique, at levels of sensitivity and accuracy much higher than those achievable with classical low-angle light scattering instrumentation. This method also relaxes the requirements on the optical∕mechanical stability of the experimental setup and allows for a real time analysis. The HNFS technique has been tested by using calibrated colloidal particles and its capability of performing accurate particle sizing was ascertained on both monodisperse and bimodal particle distributions. Nonstationary samples, such as aggregating colloidal solutions, were profitably studied, and their kinetics quantitatively characterized.

Ferri, F., Magatti, D., Pescini, D., Potenza, M., Giglio, M. (2004). Heterodyne near-field scattering: A technique for complex fluids. PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS, 70(4), 1-41405 [10.1103/PhysRevE.70.041405].

Heterodyne near-field scattering: A technique for complex fluids

PESCINI, DARIO;
2004

Abstract

We implemented the heterodyne near-field scattering (HNFS) technique [D. Brogioli et al., Appl. Phys. Lett. 81, 4109 (2002)], showing that it is a fairly valid alternative to traditional elastic low-angle light scattering and quite suitable for studying complex fluids such as colloidal systems. With respect to the original work, we adopted a different data reduction scheme, which allowed us to improve significantly the performance of the technique, at levels of sensitivity and accuracy much higher than those achievable with classical low-angle light scattering instrumentation. This method also relaxes the requirements on the optical∕mechanical stability of the experimental setup and allows for a real time analysis. The HNFS technique has been tested by using calibrated colloidal particles and its capability of performing accurate particle sizing was ascertained on both monodisperse and bimodal particle distributions. Nonstationary samples, such as aggregating colloidal solutions, were profitably studied, and their kinetics quantitatively characterized.
Articolo in rivista - Articolo scientifico
Light scattering; soft matter; optics; near field scattering
English
2004
70
4
1
41405
041405
open
Ferri, F., Magatti, D., Pescini, D., Potenza, M., Giglio, M. (2004). Heterodyne near-field scattering: A technique for complex fluids. PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS, 70(4), 1-41405 [10.1103/PhysRevE.70.041405].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/21603
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