Effective Viscosity of Polymer Solutions: Relation to the Determination of the Depletion Thickness and Thickness of the Adsorbed Layer of Cellulose Derivatives

Hoogendam, C.W.; Peters, Jeroen; Tuinier, Remco; Keizer, A. de; Stuart, Martien A. Cohen; Bijsterbosch, B.H.

doi:10.1006/jcis.1998.5762

Cited by 24 publications

(16 citation statements)

References 19 publications

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“…The refractive index increment value (dn/dc) of 0.196 ml g − 1 was used, as reported by Caruso et al [52], for PSS/PAH multilayers, whereas 0.17 ml g − 1 for CMC/CHI film averaged from values determined for CMC 0.15 ml g − 1 [53] and 0.19 ml g − 1 for chitosan [54]. Precursor layer of polyethyleneimine (1 mg ml…”

Section: Ellipsometrymentioning

confidence: 99%

Polymer multilayer film formation studied by in situ ellipsometry and electrochemistry

Haberska

Ruzgas

2009

Bioelectrochemistry

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Polyelectrolyte multilayer films adsorbed on gold surfaces were studied by combined ellipsometric and electrochemical methods. Multilayers were composed of "synthetic" (poly(4-styrenesulfonic acid) ammonium salt (PSS) and poly(allylamine hydrochloride) (PAH) (PSS/PAH)) and "semi-natural" (carboxymethyl cellulose (CMC) and chitosan (CHI) (CMC/CHI)) polyelectrolytes. It was found that only PSS/PAH Layer-by-Layer (LbL) assembled structures result in dense surface confined films that limit permeability of small molecules, such as ferri-/ferrocyanide. The PSS/PAH assemblies can be envisaged as films with pinholes, through which small molecules diffuse. During the LbL deposition process of these films a number of pinholes quickly decay. A representative pinhole diameter was found to be approximately 20 μm, which determines the diffusion of small molecules through LbL films, and yet remains constant when the film consists of a few LbL assembled polyelectrolyte bilayers. CMC/CHI LbL assemblies at gold electrode surfaces give very low density films, which do not limit the diffusion of ferri-/ferrocyanide between the surface of the electrode and the solution.

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Section: Ellipsometrymentioning

confidence: 99%

Polymer multilayer film formation studied by in situ ellipsometry and electrochemistry

Haberska

Ruzgas

2009

Bioelectrochemistry

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“…This suggests that any depletion induced attraction is so weak in this system of relatively large silica particles that the assembly of the colloidal crystal is not affected. This conjecture is corroborated by simple calculations of the interparticle forces based on the work by Snowden et al [24] and Hoogendam et al [34], which suggest that the depletion attraction is insignificant compared to the electrostatic repulsion even at relatively high ionic strengths.…”

Section: Silica Colloidal Filmsmentioning

confidence: 75%

Migration and precipitation of soluble species during drying of colloidal films

Wedin¹,

Bergström²

2005

Journal of Colloid and Interface Science

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The evaporation-induced convection resulted in a transport of dissolved species, a water-soluble polymer (carboxymethylcellulose) and dissolved CaCO(3), to the drying front of silica and CaCO(3) dispersions where the material eventually precipitates. Scanning electron microscopy and chemical analysis showed that the concentration of carboxymethylcellulose, CMC, is highest in the centre of the dried silica film and decreases towards the perifery. The colloidal films of the monodisperse silica particles displayed a high degree of structural order even at high concentrations of the non-adsorbed polymer CMC, which suggests that any depletion induced interparticle attraction is insufficient to affect the assembly of the colloidal crystal. The CaCO(3) particles are slightly soluble and we found that rod-like crystals reprecipitated in the centre of the particle films on top of the polyacrylate-coated particles. Addition of CMC disturbs the formation of distinct crystal shapes which was attributed to a complexation of Ca(2+) in solution.

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“…CMC molecules are adsorbed on the surface of hydrophobic PS particles, which contributes to disperse the particle into water due to its hydrophobic cellulose backbone and hydrophilic substituent. e thickness of the CMC adsorbed layer was measured by various methods (Brown and Rymden, 1987;Hoogendam et al, 1998;Grządka, 2011). In these studies for various particles on the e ects of pH, concentration and molecular weight of CMC, it was reported that the thickness of the adsorbed layer was roughly constant on the order of 10 nm or more.…”

Section: ( )mentioning

confidence: 99%

Effect of Additives on the Rapid Destruction Process of Particle Aggregates in a Startup Shear Flow

Komoda

Furuse

Hidema

et al. 2020

J. Chem. Eng. Japan / JCEJ

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Aqueous dispersions of polystyrene particles were prepared containing sodium carboxymethylcellulose (CMC) and sodium chloride (NaCl). The destruction process of the aggregates at a time scale less than one second was observed directly using a parallel disk geometry with startup rotation. The shear history di ers with vertical positions under this unsteady shear ow and a ects the time variation of aggregate size. It is found that the destruction process of aggregates at any position was correlated well by the introduction of cumulative shear strain. The e ects of the additives on the fragility and stable size of aggregates under the unsteady shear ows have been investigated. It was revealed that the dominant factor of the fragility was changed from electrostatic repulsion to steric repulsion as increasing polymer concentration. In the electrostatic dominant regime, aggregates were easily destroyed at lower ionic strength. In contrast, stable aggregate size was decreased monotonically by increasing CMC concentration even in the electrostatic dominant regime.

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Effective Viscosity of Polymer Solutions: Relation to the Determination of the Depletion Thickness and Thickness of the Adsorbed Layer of Cellulose Derivatives

Cited by 24 publications

References 19 publications

Polymer multilayer film formation studied by in situ ellipsometry and electrochemistry

Polymer multilayer film formation studied by in situ ellipsometry and electrochemistry

Migration and precipitation of soluble species during drying of colloidal films

Effect of Additives on the Rapid Destruction Process of Particle Aggregates in a Startup Shear Flow

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