Adsorption of amphiphilic polysaccharides onto polystyrene latex particles

Simon, Sébastien; Picton, Luc; Cerf, Didier Le; Müller, G.

doi:10.1016/j.polymer.2005.03.057

Cited by 22 publications

(16 citation statements)

References 32 publications

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“…It is noteworthy to mention that some of the assumptions of these equations do not apply to the studied system, especially since the system asphaltenes-demulsifiers shows nearly irreversible behavior 27,37,38 . However, it has been previously shown 51 evidently not Langmuir-type. This has been attributed to the fast initial adsorption followed by reorganization and relaxation processes at long times as well as multiple phase transitions and multilayer accommodation at the interface.…”

Section: Resultsmentioning

confidence: 81%

Mixed Interfaces of Asphaltenes and Model Demulsifiers, Part II: Study of Desorption Mechanisms at Liquid/Liquid Interfaces

2015

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This article is the continuation of a preceding paper (Part I) in which the adsorption and desorption of asphaltenes from the oil/water interface by pure solvent and model demulsifiers was studied. In this second part, the composition of mixed interfaces of asphaltenes and two demulsifiers (Brij®-93 and Pluronic® PE8100) was studied. Desorption of asphaltenes by demulsifiers, and vice versa, was determined. First, the composition of a mixed interface (asphaltenes and demulsifiers) through the use of the Langmuir equation of state (EoS) was determined. Second, an experimental set-up that mimics, to some extent, the chemical demulsification of water-in-crude oil emulsions during the production stages was used.Desorption of already adsorbed asphaltenes at the liquid-liquid interface by the action of two demulsifiers was assessed. It was found that desorption is always initiated by interactions between demulsifiers and asphaltenes. It is followed by the plausible formation of complexlike structures to finally end in the replacement, by displacement from the interface, of asphaltenes by demulsifiers. Third, the assessment of Brij®-93 and PE8100 desorption from the oil/water interface by the action of asphaltenes was also carried out. It was found that asphaltenes can desorb PE8100 at low surface coverage.

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Section: Resultsmentioning

confidence: 81%

Mixed Interfaces of Asphaltenes and Model Demulsifiers, Part II: Study of Desorption Mechanisms at Liquid/Liquid Interfaces

2015

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“…Polyelectrolytes have many applications due to their unique physicochemical characteristics. Particularly, the carboxymethylpullulan (CMPull) has been described as well as their amphiphilic derivatives of various degree of grafted hydrophobic chains (Simon, Picton, Le Cerf & Muller, 2005) and it has interest in many applications in biotechnology and medicine (Mocanu, Mihai, Dulong, Picton, & Le Cerf, 2011). It has been also used as precursor to form polyelectrolyte pH-sensitive hydrogel by cross-linking reaction (Dulong, Mocanu, & Le Cerf, 2007).…”

Section: Introductionmentioning

confidence: 99%

Effect of carboxymethyl groups on degradation of modified pullulan by pullulanase from Klebsiella pneumoniae

Ali

Rihouey

Cerf

et al. 2013

Carbohydrate Polymers

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“…They are available in all three forms, i.e. cationic, anionic and nonionic and may be synthetic (acrylic acid polymers and copolymers, styrene sulfonate polymers and copolymers, maleic acid copolymers with nonionic monomers, derivatives of phenol-formaldehyde resin; polyalkyleneimine and polyhydroxyalkyleneamine, diallyldimethylammonium chloride polymers and copolymers; polymers and copolymers of quaternized tertiaryaminoalkyl esters and amides with acrylamide, poly(1-aminoethylene) such as polyvinylamine (PVAm) and related polymers) [2][3][4][5][6] and natural (ionic derivatives of gum guar, starch, dextran, chitosan) [7][8][9][10][11]. Synthetic flocculants are more performant than the natural ones, requiring lower polymer dose to obtain an efficient flocculation.…”

Section: Introductionmentioning

confidence: 99%