Dr. Robert P. Guzmán Estrada Profile

Dr. Robert P. Guzmán Estrada

at Univ de la Frontera

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Proceedings Article | 18 November 2013 Paper

Nonequilibrium free diffusion in seed leachate

Luis Ortiz G., Pablo Riquelme P., R. Guzmán

Proceedings Volume 8785, 8785BU (2013) https://doi.org/10.1117/12.2027772

KEYWORDS: Diffusion, Particles, Particle sizing, Near field, Mie scattering, Structural dynamics, Light scattering, Latex, Interfaces, Scattering

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In this work, we use a Schlieren-like Near Field Scattering (SNFS) setup to study nonequilibrium free diffusion behavior of a colloidal solution obtained from seeds leachate. The main objective is to compare the temporal behavior of the diffusion coefficient of seed leachate with an electric conductivity based vigor test. SNFS sizing measurements, based on Mie theory, were carried out to ensure its reliability and sensitivity. Then, we performed a typical nonequilibrium free diffusion experiment of a glycerol-water mixture. In this way, we confirmed that SNFS setup is sensitive to giant concentration fluctuations of nanocolloidal solutions. The results obtained in this stage reproduce properly the data reported elsewhere in literature. Moreover, seed leachate diffuse, in water, in a similar way that glycerol does. In both cases we used the same method (dynamic structure factor) to determine thermo-physical properties. We show that time evolution of diffusion coefficient of Lupinus Albus leachate exhibits three defined regimes as electric conductivity measurements. The results also exhibit a correspondence between the behavior of the diffusion coefficient and electric conductivity values of the two regions in the temporal range studied. Finally, we discuss biological processes involved in germination that could modulate this dependence, and the role played by the electrolytic nature of solutes.

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