Untersuchungen zum Anhaften von Teilchen an eine Platte in wäßrigen Elektrolytlösungen

Mühle, K.; Domasch, K.

doi:10.1007/bf01668788

Cited by 5 publications

(2 citation statements)

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“…Finally it must be noted that there is a discrepancy between the values of the adhesive forces previously measured [25,26] and the results offered in this study. This is because in the first investigations fluid motions acting on the attached particles during the centrifuging steps might have caused a strengthening of adhesive bonds in bridging flocculation.…”

Section: Ioi-mentioning

confidence: 60%

“…Experimental results on particle adhesion due to the action of polymer bridges which span the energy barrier at low electrolyte concentrations have been discussed previously [25,26]. Further preliminary tests indicate an optimum for the flocculation of quartz or glass particles with hydrolysed polyacrylamide (hPAA) in the presence of magnesium chloride at pH 10.…”

Section: B) Adhesion Caused By Polymer Bridgingmentioning

confidence: 94%

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Particle adhesion in coagulation and bridging flocculation

Mühle

1985

Colloid & Polymer Sci

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Abstract:The adhesive forces between solid particles mutually attached during coagulation or bridging flocculation are important for modelling floc stability. Results are presented in this study which are obtained from experiments on the adhesion of glass or quartz particles to a flat glass substrate (centrifugal method) or to the wall of a glass capillary through which an aqueous electrolyte solution was passed. Coagulation experiments carried out in 10 -2 mole/1 MgCI2 showed the action of hydration layers on hydrophilic surfaces, whereas surface methylation is associated with adhesion in the inner potential minimum. In addition essential ageing effects interpreted as interparticle gelation were observed, especially on the interaction of alkali glass surfaces. Adhesive strength in the case of flocculation with hydrolysed polyacrylamide and a cationic Praestol mainly depends on the polymer concentration and on the preadsorption conditions before the particle-substrate attachment. A significant strengthening of adhesion due to reconformation of the bridging agents was not observed for a contact time greater than 3 rain. The effect of steric stabilization with polymer overdosing could be proved by a special preparation technique.

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Section: Ioi-mentioning

confidence: 60%

Section: B) Adhesion Caused By Polymer Bridgingmentioning

confidence: 94%