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Overuse and Depletion

Overuse and Depletion Groundwater is the largest source of usable, fresh water in the world In many parts of the world, especially where surface water supplies are not available, domestic, agricultural, and industrial water needs can only be met by using the water beneath the ground...

The role of electrostatistics in saliva

The results indicate that the sign and the density of the charge on the surface of the droplets contribute significantly to the behavior of an emulsion when mixed with saliva Depending on the charge, saliva-induced emulsion flocculation is driven by two different main mechanisms depletion flocculation and electrostatic attraction...

RHEOLOGICAL STUDIES OF FULLY

Depletion flocculation phenomena where the blue circles represent latex or pigment particles and the yellow lines represent free floating polymer in the continuous media This yellow polymer can be a rheology modifier such as...

Creaming and Flocculation of Oil

This is attributed here to depletion flocculation by unadsorbed caseinate, probably in the form of small particles called casein submicell Light microscopy has confirmed that the visually observable extent of reversible depletion flocculation in concentrated emulsions of ,...

Depletion flocculation in dispersions of sterically ,

Jun 01, 1986 0183 32 Colloids and Surfaces, 18 1986 261-281 261 Elsevier Science Publishers B V, Amsterdam - Printed in The Netherlands DEPLETION FLOCCULATION IN DISPERSIONS OF STERICALLY STABILISED PARTICLES SOFT SPHERES BRIAN VINCENT , JOHN EDWARDSf, SIMON EMMETT and ANDREW JONES Department of Physical Chemistry, University of Bristol, ,...

PDF The role of electrostatics in saliva

Jun 01, 2007 0183 32 The results indicate that the sign and the density of the charge on the surface of the droplets contribute significantly to the behavior of an emulsion when mixed with saliva Depending on the charge, saliva-induced emulsion flocculation is driven by two different main mechanisms depletion flocculation and electrostatic attraction...

Depletion and bridging flocculation of oil droplets in the ,

Depletion stabilization and depletion flocculation ....

Depletion Flocculation of Latex Dispersion in Ionic ,

It was found that flocculation would occur once the energy well formed by depletion attraction exceeded 3 kBT, while restabilization occurred once the long range structural energy barrier exceeded ....

Recent progress in Pickering emulsions stabilised by ,

For example, the addition of non-adsorbed CNFs to CNC-based Pickering emulsions is suggested to adjust the interfacial behaviour via a depletion flocculation mechanism and thus improve overall emulsion stabilisation 42 Depletion flocculation in an emulsion system is associated with an increase of attractive interactions between the droplets ....

Depletion flocculation of caseinate

May 04, 2004 0183 32 The depletion flocculation theory for soft steric polymer-coated spheres has been investigated by Vincent and co-workers , , , , , , and also latterly by Seebergh and Berg In contrast to hard spheres, the depletion effect in soft hairy spheres is much reduced due to the interpenetration of the free non-adsorbed polymer with the anchored ....

Clarification / Flocculation Wyeast Laboratories

Flocculation can occur in the range of 15 to 90 Lab trials have shown that both increases and decreases in ethanol levels enhances flocculation One study of a NewFlo strain showed flocculation increased from 58 to 71 when the pitch rate was gradually increased from 1 ,...

Depletion Flocculation of Beverage Emulsions by Gum Arabic ,

Jul 20, 2006 0183 32 Depletion flocculation led to an increase in creaming instability and apparent viscosity of the emulsions Flocculation could be nondestructively monitored by measuring the decrease in ultrasonic attenuation of the emulsions These results show that depletion flocculation by gum arabic and modified starch can have an adverse effect on the ....

Factors Affecting the Stability of Emulsions Stabilised by ,

Aug 22, 2018 0183 32 When used in combination with a protein, xanthan stabilises emulsions as an indirect consequence of depletion flocculation, resulting in a mechanically stable protein and droplet rich network surrounded by a xanthan-rich phase Advertisement 5 ,...

Depletion Flocculation

Feb 09, 2016 0183 32 About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy Safety How YouTube works Test new features Press Copyright Contact us Creators ....

Rheological behavior of carboxymethylcellulose and ,

Jul 19, 2021 0183 32 Depletion flocculation formed a percolated structure of liquid crystalline domains, resulting in a gel-like structure, which was evidenced by polarized optical microscopy The strong effects on rheological properties by mixing small quantities of CMC and CNC suggest that this system may find applications where tunable rheological properties of ....

Depletion stabilization and depletion flocculation ,

Jun 01, 1980 0183 32 Depletion Stabilization and Depletion Flocculation ROBERT I FEIGIN AND DONALD H NAPPER Department of Physical Chemistry, The University of Sydney, New South Wales 2006, Australia Received December 10, 1979 accepted February 6, 1980 An approximate theory of depletion stabilization and depletion flocculation ie, stabilization and flocculation of colloidal particles by ,...

THE INTERACTION BETWEEN DEPLETION, ERA

THE INTERACTION BETWEEN DEPLETION FLOCCULATION AND MOLECULAR LIQUID-LIQUID PHASE SEPARATION MECHANISMS Author / Creator Kumar, Anupam There is growing interest in the formulation and application of nano colloids non-adsorbing polymer in fields of nanomedicine, hydrocarbon production, and environmental science...

Flocculation emulsions

Flocculation emulsions There appear to be two stages in the collapse of emulsions flocculation, in which some clustering of emulsion droplets takes place, and coalescence, in which the number of distinct droplets decreases see Refs 31-33 Coalescence rates very likely depend primarily on the film-film surface chemical repulsion and on the degree of irreversibility of film desorption, as ....

Flocculation of Clay Colloids Induced by Model ,

Jun 29, 2017 0183 32 General models of polyelectrolyte-induced flocculation distinguish 1 polyelectrolyte bridging, 2 polyelectrolyte patching, and 3 depletion flocculation involving the free, desorbed polyelectrolyte chains in the suspension 5-7 In real applications, a combination of such mechanisms is to occur, especially as the emerging approaches make use ....

Flow Assurance Principles in Oil Gas Industries

The polymeric aggregation of colloidal dispersion of this nature is known as Depletion Flocculation Mechanism as described by DH Napper in his book entitled Polymeric Stabilization of Colloidal Dispersions , Academic Press, New York,1983 IV Electrokinetic Effect When a crude oil is flowing in a conduit porous media, well, pipeline, etc ....

Controlling the dispersion or flocculation of colloidal ,

Many large scale industrial processes paper production, water treatment and dewatering processes require de-stabilization or flocculation of dispersed particulat For other industries and products such as foods, cosmetics, paints and pharmaceuticals, the goal often to promote stabilization and enhance shelf life and consumer appeal...

Depletion forces and flocculation with surfactants ,

Feb 01, 2015 0183 32 Depletion flocculation induced by synergistic effects of nanoparticles and polymers J Phys Chem B, 117 2013 , pp 16602-16609 CrossRef View Record in Scopus Google Scholar Presents experimental results showing how synergistic effects can lead ,...

Water Soluble Polymer Flocculants Synthesis ,

Flocculation by bridging or charge neutralization coagulation , however, are not mutu-ally exclusive It is possible for flocculation to happen due to combined charge neutralization and bridging effects, as is the case with high molecular weight polyelectrolyt Another pos-sible mechanism for particle aggregation is called depletion ....

Poly ethylene oxide PEO and poly vinyl pyrolidone PVP ,

The addition of PEO to stable nanoparticle dispersions leads to depletion flocculation in both deionized water and buffer solutions The instability mechanism for the PVP-nanoparticle system depends on the suspension medium In water, bridging occurs below the saturation adsorption of PVP, whereas depletion phase separation is evident at ....

PDF Depletion Flocculation in Colloidal Dispersions

The phase separation of the dispersion with 01 g/L xanthan was a result of depletion flocculation, and the stability of the dispersion with 05 g/L xanthan was probably due to the depletion ....

DLVO Practical Solubility Science Prof Steven Abbott

You might also work out that other effects solubility via HSP thinking, bridging or depletion flocculation, Smoluchowski exceptions are more important, making DLVO largely irrelevant A specific application of DLVO is discussed in the Polymers section of Practical Surfactants...

Flocculation of silica particles by adsorbing and non ,

The critical polymer concentrations required to induce depletion flocculation were 02, 01 and 005 for hydroxyethyl cellulose HEC , sodium carboxymethyl cellulose CMC and sodium polystyrene sulphonate PSS , respectively Varying the charge density of the CMC had no apparent effect on the critical polymer concentration required to induce ....

Incipient flocculation molding A new ceramic

Incipient Flocculation Molding IFM was conceived as a new near-net-shape forming technique for ceramic components It was hypothesized that the development of a temperature-dependent deflocculant would result in a forming technique that is flexible, efficient, and capable of producing a superior microstructure with improved mechanical properties from highly reactive, submicron ceramic powders...

Influence of oat components on lipid digestion using an in ,

Depletion flocculation is a well-known instability mechanism that can occur in oil-in-water emulsions when the concentration of non-adsorbed polysaccharide exceeds a certain level This critical flocculation concentration depends on the molecular characteristics of the polysaccharide molecules, such as their molecular weight and hydrodynamic radius...

Depletion Flocculation Practical Solubility Science ,

Frustratingly, if we add a little too much polymer, we can de-stabilize the system via a non-intuitive effect called Depletion Flocculation To get a feel for the effect, play with the radius of the particles, the radius radius of gyration of the polymer, its concentration and MWt The ,...