• "An investigative study of polymer adsorption onto ...

    For colloidal systems with adsorbed polymer, the mechanisms governing stabilization and flocculation are defined by the critical overlap concentration, c*. Below c*, steric stabilization or bridging flocculation are viable mechanisms of adsorption, while above c* associative thickening stabilization, depletion stabilization or depletion flocculation may occur.

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  • Depletion Flocculation of Nonaqueous Dispersions ...

    Depletion flocculation, induced in dispersions of hydrophobic silica particles in nonpolar media by the presence of binary mixtures of nonadsorbing polymers, has been investigated both experimentally and theoretically. The binary mixtures used were either similar polymers having different molecular weights or mixtures of chemically different polymers.

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  • Influence of oat components on lipid digestion using an in ...

    Depletion flocculation is a wellknown instability mechanism that can occur in oilinwater emulsions when the concentration of nonadsorbed polysaccharide exceeds a certain level. This critical flocculation concentration

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  • Flocculation WikiMili, The Free Encyclopedia

    A depletion force is an effective attractive force that arises between large colloidal particles that are suspended in a dilute solution of depletants, which are smaller solutes that are preferentially excluded from the vicinity of the large particles. One of the earliest reports of depletion forces that lead to particle coagulation is that of Bondy, who observed the separation or 'creaming' of rubber latex upon addition .

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  • Depletion flocculation of polystyrene latices by water ...

    The flocculation was reversible to dilution and weak shear forces and was attributed to polymer depletion. The results correlated well with predictions from potentialenergy calculations incorporating van der Waals, electrostatic, steric and depletion terms.

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  • OPULYN™ 301 Opacifier (Hair Care, Skin Care)

    Overcoming Depletion Flocculation Flocculation and sedimentation are the two most common symptoms of formulation instability. Certain conditions, such as high betaine levels, high electrolyte levels or the presence of cationic ingredients, can pose additional stability challenges in a formulation.

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  • Influence of PVA and CMC on the properties of pigment ...

    The viscosity results showed that CMC colors have less tenacious flocculation properties as compared to PVA colors. For CMC as a cobinder, CMC molecules remaining in the aqueous phase flocculate the pigment via a depletion flocculation mechanism. The depletion flocculation by CMC was more evident in platy clay coating colors. ACKNOWLEDGMENTS

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  • Flocculation | definition of flocculation by Medical ...

    flocculation [flok″ula´shun] the formation of a precipitate or agglomerate in the form of downy tufts or floccules. flocculation test any serologic test in which flocculation takes place; usually applied to a variant form of the precipitin reaction. floc·cu·la·tion (flok'yūlā'shŭn), Do not confuse this word with floccillation. Precipitation ...

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  • Prospects and Challenges of Using CoagulationFlocculation ...

    The purpose of coagulation and flocculation is to remove particulate impurities, especially nonsettleable solids and colour from the water being treated. Nonsettleable particles in water are removed by the use of coagulating chemicals. In the coagulation process, chemicals are added which will

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  • Suspension Concentrates: Preparation, Stability and ...

    Suspension Concentrates is a survey into the theory of the formulation and stabilization of suspensions, elaborating on the breaking of aggregates and agglomerates and the role of dispersing agents on flocculation and electrostatic and steric stabilization.

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  • Microbial flocculation, a potentially lowcost harvesting ...

    Dec 13, 2008· Abstract. Microbial flocculation is investigated as a separation technique for harvesting marine microalgae for the production of biodiesel. Organic carbon (acetate, glucose or glycerine) was used as substrate for the growth of flocculating microbes in situ. Under stress, due to nutrient depletion, these microbes produced extracellular polymeric...

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  • Investigation of Hydrodynamic and Depletion Interactions ...

    As a result, significant colloidal forces arising from the nonadsorbed nanoparticles (, depletion and structural forces) were always observed in the measured forces, which complicated the data analysis and also caused significant scatter in the resulting hydrodynamic forces.

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  • Associative polymer/latex dispersion phase diagrams II ...

    Apr 01, 2005· Depletion flocculation is more commonly encountered in coatings than bridging flocculation, due, in part, to the elevated surfactant concentrations in most commercial coatings. Because the dispersion behavior in systems thickened with associative polymers is complex, it would be useful to have a way to visualize the possibilities.

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  • An investigative study of polymer adsorption onto ...

    For colloidal systems with adsorbed polymer, the mechanisms governing stabilization and flocculation are defined by the critical overlap concentration, c*. Below c*, steric stabilization or bridging flocculation are viable mechanisms of adsorption, while above c* associative thickening stabilization, depletion stabilization or depletion flocculation may occur.

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  • (PDF) The influence of xanthan and λcarrageenan on the ...

    It is suggested that the depletion flocculation of the emulsion droplets, induced by the addition of xanthan, leads to the formation of a particle network and that it is the timedependent yield ...

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  • Serum separation and structure of depletion and bridging ...

    Flocculation by depletion and bridging was induced by addition of the polysaccharide carboxymethylcellulose (CMC) to emulsions that were stabilised by lactoglobulin ( .

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  • Flocculation YouTube

    Apr 20, 2012· Water Treatment | Coagulation Flocculation Basics Duration: 3:52. American Water College 47,812 views. 3:52. Melting Aluminum Cans At Home Easy DIY Recycling Process .

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  • Algaculture Wikipedia

    Algaculture is a form of aquaculture involving the farming of species of algae.. The majority of algae that are intentionally cultivated fall into the category of microalgae (also referred to as phytoplankton, microphytes, or planktonic algae). Macroalgae, commonly known as seaweed, also have many commercial and industrial uses, but due to their size and the specific requirements of the ...

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  • Using dispersion/flocculation phase ... SpringerLink

    The colloidal interactions of associative polymers and latexes in the presence of surfactant are complex. This is because, in addition to good particle dispersion, both bridging and depletion flocculation can occur. Therefore, we have developed phase diagrams to help visualize these interactions.

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  • depletion flocculation DeutschÜbersetzung – Linguee ...

    Challenges like climate change, the depletion of the ozone layer or the preservation of biodiversity show the need for an active environmental policy in order to ensure a responsible use of scarce natural resources and an economic development which is environmentally and socially .

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  • Deswelling and depletion flocculation of microgel ...

    May 12, 2000· Additionally, the influence of the dextran solution over the colloidal stability of the microgel particles has also been studied by turbidimetry. The results show that the extent of deswelling increases with an increase in the dextran concentration in the range where flocculation by depletion is absent. Finally, depletion flocculation is detected.

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  • Clustering of Binary Colloidal Suspensions: Theory

    systems (2). The initially stable colloidal sus pension started to undergo flocculation upon the addition of polymers to the solution when the polymeric density was above some value c* (depletion flocculation) and the floccula tion rate of the colloidal particles peaked at some higher polymeric density c*** > c*.

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  • Steric Stabilisation and Flocculation by Polymers ...

    The effect of addition of free polymer to sterically stabilised dispersions, depletion flocculation, was investigated using rheological measurements.

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  • Phase behavior of colloid–polymer depletion mixtures with ...

    tions, depletion interactions induced by polymers added in storage or preparation may generate either desired structures 14 or deleterious aggregation 15 in products.

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  • Poly(ethylene oxide) (PEO) and poly(vinyl pyrolidone) (PVP ...

    Poly(ethylene oxide) (PEO) and poly(vinyl pyrolidone) (PVP) induce different changes in the colloid stability of nanoparticles

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