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Colloidal dispersion stability : kinetic modeling of agglomeration and aggregation

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Colloidal dispersion stability : kinetic modeling of agglomeration and aggregation

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Título Colloidal dispersion stability : kinetic modeling of agglomeration and aggregation
Autor Gonzatti, Guilherme Kilpp
Netz, Paulo Augusto
Fiel, Luana Almeida
Pohlmann, Adriana Raffin
Abstract In this work we present a simple model for the kinetics of agglomeration and aggregation of colloidal particles. We consider that particles agglomerate rapidly and endothermically forming oligomers. These oligomers can, in turn, aggregate irreversibly, in a process that leads to the destabilization of the colloidal system. As these two processes have very different relative energy activations, they occur in different time-scales: the first step is faster and reaches a state of quasi‑equilibrium. Because of this, the enthalpy change during the agglomeration can be experimentally determined through the variable temperature multiple light scattering (VTMLS) method. Interestingly, this value is related to the relative kinetic stability of the system and can be used to evaluate the stability of new colloidal compositions. Our results are in qualitative agreement with experimental data of low concentration colloidal dispersions consisted of polymer particles and/or surfactant-coated particles.
Contido em Journal of the Brazilian Chemical Society. São Paulo. Vol. 26, no. 2 (Feb. 2015), p. 373-380
Assunto Cinética
Colóides
[en] Colloidal stability
[en] Indefinite self-association
[en] Kinetic modeling
[en] Secondaryminimum
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/130100
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