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• W2016486238 abstract "The flocculation behaviour of three different aqueous colloidal dispersion systems is examined in the presence of soluble hydroxyethyl cellulose (HEC) molecules by means of rheology. One alumina and two polystyrene dispersions were used for comparison with particle solid contents varying from 20 to 50% (v/v). All dispersions were sterically stabilised by either chemical or physical adsorption of an appropriate polymeric dispersant. Addition of HEC (MW range 170 000–1 000 000) followed stabilisation within a concentration range of 0.2–1% (w/solvent volume). Both continuous and oscillatory shear measurements were carried out and the yield value and elastic modulus have been chosen as providing a good indication of the degree of aggregation. The variation of the above parameters is examined with respect to HEC and solid contents as well as to the polymer molecular weight and the flocculation mechanism and aggregation kinetics are discussed. It is suggested that particles aggregate as a result of a depletion flocculation mechanism. According to this mechanism, above a critical concentration (critical flocculation point), polymer is depleted from the interparticle space after a particle collision which gives rise to an osmotic pressure gradient with respect to the bulk of the solution and flocculation starts taking place. All systems seem to exhibit characteristics of a fractal based structure above a certain solid volume fraction The differences found in the aggregation kinetics of the ceramic dispersion compared to the two polystyrene dispersions were attributed to the significant degree of pre-shearing of the ceramic dispersion. In addition, some form of interaction between the dispersant and the polymer was suggested in the case of chemically grafted polystyrene dispersions. Generally, the aggregation process can be explained with existing depletion flocculation theories." @default.
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• W2016486238 date "1999-07-01" @default.
• W2016486238 modified "2023-09-23" @default.
• W2016486238 title "Depletion flocculation of particulate systems induced by hydroxyethylcellulose" @default.
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• W2016486238 doi "https://doi.org/10.1016/s0927-7757(98)00838-3" @default.
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