Study of suspension settling: A approach to determine suspension classification and particle interactions

Abstract

The properties of mineral suspensions do not evolve linearly with particle mass fraction. For some critical concentrations these properties are abruptly modified due to a change of relative interparticle interaction force prevalence. Using kaolin and glass beads as model materials, physicochemical stability and rheological measurement have been carried out in order to propose a global and discriminant parameter enabling the nature of particle interactions to be identified. Different types of suspensions were studied namely: diluted suspensions, concentrated suspensions and solid suspensions. Physico-chemical stability, studied by optical dispersion analysis (Turbiscan MA 2000) enables the clarification rate to be measured and to propose a new global parameter, the "phase separation index". In addition, rheological analysis was realized by the means of viscous flow measurement. Behaviour of solid suspensions is satisfactorily described by Oswald de Waele power law in the whole range of concentration studied which tends to demonstrate that the interactions remains the same in this range.

Vegetable oils as core of cationic polymeric nanocapsules: influence on the physicochemical properties

“…On the other hand, from the PSI values, a great difference could be observed between the NC containing vegetable oils (0.563-0.742%) and the CCT-NC (0.092%), which indicates that the nanoparticles containing capric/caprylic triglycerides, after started migrating, migrated slower to the top of the sample cell than the nanoparticles containing vegetable oils. The difference observed for the comparisons between the creaming rate and the PSI values could be explained by the fact that the PSI calculus considers the effect of the fraction volume and particle diameter, as they are related with the BS signal [27,29]. Although the NC prepared with vegetable oils presented higher mean sizes than CCT-NC, they showed higher creaming of the particles after 12 h.…”

“…The selection of the linear portion is necessary to exclude the effect of the number of particles in the migration profile [29]. The phase separation index (PSI), after 12 h of analyses, was also determined as proposed by Vie et al [29].…”

“…The selection of the linear portion is necessary to exclude the effect of the number of particles in the migration profile [29]. The phase separation index (PSI), after 12 h of analyses, was also determined as proposed by Vie et al [29]. This parameter was previously proposed for the study of the sedimentation observed for kaolin suspensions and could be obtained by Equation (2).…”

Methyl parathion hydrolase based nanocomposite biosensors for highly sensitive and selective determination of methyl parathion

“…This structure is believed to provide a significant increase on the effective electrode area for immobilization of biomolecules. On the other hand, the interparticular force (Vie et al, 2007) and coalescence force (Chen et al, 2004) may render the nanocomposite film enough stability for settling on the surface.…”

Process chain and characterisation of nanoparticle enhanced composite coatings

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Doctor blade 24Contact angle 25Easy to clean 26 2 7 a b s t r a c t 28 The structure and the application properties of complex nanoparticulate coatings depend on the entire 29 process chain, i.e. the nanoparticle production, the stabilization, the formulation and the further process-30 ing to a coating.

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