Desorption of Low-Charge-Density Polyelectrolyte Adlayers in Aqueous Sodium n-Dodecyl Sulfate Solution

Rojas, Orlando J.; Neuman, Ronald D.; Claesson, Per M.

doi:10.1006/jcis.2001.7444

Cited by 35 publications

(36 citation statements)

References 35 publications

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“…[9][10][11][12][13][14][15][16][17] The second group of studies focus on the adsorption of surfactants onto preadsorbed layers of oppositely charged polyelectrolytes. 12,[17][18][19][20][21][22][23] For a given system, the structure and properties of the mixed layers were found to be considerably different in the two kinds of experiments indicating the strongly non-equilibrium character of polyelectrolyte/surfactant association. 12,17 Adsorption/deposition of preformed polyelectrolyte/surfactant aggregates on solid surfaces has been investigated in several studies.…”

Section: Introductionmentioning

confidence: 99%

Controlling the interaction of poly(ethylene imine) adsorption layers with oppositely charged surfactant by tuning the structure of the preadsorbed polyelectrolyte layer

et al. 2011

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This study contributes to the understanding of how the structure of preadsorbed polyelectrolyte layers affects their interaction with oppositely charged surfactants. The adsorbed amount, and thus the adsorption layer structure of poly(ethylene imine), (PEI), was tuned by the pH (4, 6 and 9) of the PEI adsorption. Following the PEI adsorption, each adsorption layer was rinsed with 10 mM NaCl solution (pH Rinse ¼ 6) to establish identical conditions for further SDS binding. The structure of the PEI adsorption layers was investigated in situ by dual polarization interferometry (DPI). By comparing the DPI results with ellipsometry results and by performing DPI and ellipsometry simulations it could be demonstrated the first time that PEI forms a vertically inhomogeneous adsorption layer that can be described as having a compact bottom part, which contains PEI molecules with a large number of surface contacts, and a swollen outer part, which includes loosely bound PEI molecules that extend far into the bulk phase. The pH of the adsorption controls not only the adsorbed mass but also the structure of the adsorbed layer, which can be further tuned by changing the pH of the rinsing solution.To investigate how the structure of the preadsorbed PEI layer affects its interfacial association with SDS, the preadsorbed polymer layers were rinsed with SDS solutions under identical conditions (10 mM NaCl, pH Rinse ¼ 6). It was found that the structure of the preadsorbed PEI layer has a profound effect on the PEI/surfactant interaction. For instance, when the outer part of the PEI layer contained a sufficient amount of polymer segments, desorption of PEI could be prevented. In contrast, when the outer part of the PEI layer was depleted in polymer segments complete desorption could be achieved provided the polymer layer was rinsed with a high concentration ($cmc) surfactant solution under continuous flow.

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Section: Introductionmentioning

confidence: 99%

Controlling the interaction of poly(ethylene imine) adsorption layers with oppositely charged surfactant by tuning the structure of the preadsorbed polyelectrolyte layer

et al. 2011

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“…Thus, the impact in the conditioning process of the interactions occurring between polyelectrolytes and anionic surfactants, and their adsorption onto the surface of the fibers, makes it essential to deepen the understanding of the behavior of these mixtures [34,75], as this is critical for an optimal development of cosmetic formulations [76]. The full potential of a conditioning formulation can only be developed by a careful examination of the different possible polymer-surfactant combinations and of the different interactions existing in the system during the conditioning process (surface-polymer, surface-surfactant and surface-polymer/surfactant) [77,78].…”

Section: Physicochemical Aspects Involved In the Conditioning Processmentioning

confidence: 99%

Physicochemical Aspects of the Performance of Hair-Conditioning Formulations

Fernández‐Peña

Guzmán

2020

Cosmetics

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Most of the currently used products for repairing and conditioning hair rely on the deposition of complex formulations, based on mixtures involving macromolecules and surfactants, onto the surface of hair fibers. This leads to the partial covering of the damaged areas appearing in the outermost region of capillary fibers, which enables the decrease of the friction between fibers, improving their manageability and hydration. The optimization of shampoo and conditioner formulations necessitates a careful examination of the different physicochemical parameters related to the conditioning mechanism, e.g., the thickness of the deposits, its water content, topography or frictional properties. This review discusses different physicochemical aspects which impact the understanding of the most fundamental bases of the conditioning process.

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“…The adsorption affinity depends heavily on the ionic strength, especially if it is driven by electrostatic interactions. Four factors that accompany the screening of electrostatic forces by addition of salts can be cited (Rojas et al 1998(Rojas et al , 2001): (i) decrease of surface-polyelectrolyte attraction, (ii) increase of competition between the polyelectrolyte and the monovalent cations for adsorption at surface sites, (iii) decrease in free energy cost in creating a charged interface, and (iv) decrease in intra-and inter-chain repulsion. Factor (iv) facilitates an increased adsorption (screening-enhanced adsorption), as observed in some systems, whereas factors (i) and (ii) promote a reduced adsorption.…”

Section: Adsorptionmentioning

confidence: 99%

Colloidal stability and aggregation of lignocellulosic materials in aqueous suspension: A review

Hubbe

Rojas

2008

BioRes

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Aqueous dispersions of lignocellulosic materials are used in such fields as papermaking, pharmaceuticals, and preparation of cellulose-based composites. The present review article considers published literature dealing with the ability of cellulosic particle dispersions (fiber, fines, nanorods, etc.) to either remain well dispersed or to agglomerate in response to changes in the composition of the supporting electrolyte solution. In many respects, the colloidal stability and coagulation of lignocellulosics can be understood in terms of well-known concepts, including effects due to osmotic pressure arising from overlapping electrostatic double layers at the charged surfaces. Details of the morphology and surface properties of lignocellulosic materials give rise to a variety of colloidal behaviors that make them unique. Adjustments in aqueous conditions, including the pH, salt ions (type and valence), polymers (charged or uncharged), and surfactants can be used to control the dispersion stability of cellulose, lignin, or wood-extractive materials to serve a variety of applications.

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Desorption of Low-Charge-Density Polyelectrolyte Adlayers in Aqueous Sodium n-Dodecyl Sulfate Solution

Cited by 35 publications

References 35 publications

Controlling the interaction of poly(ethylene imine) adsorption layers with oppositely charged surfactant by tuning the structure of the preadsorbed polyelectrolyte layer

Controlling the interaction of poly(ethylene imine) adsorption layers with oppositely charged surfactant by tuning the structure of the preadsorbed polyelectrolyte layer

Physicochemical Aspects of the Performance of Hair-Conditioning Formulations

Colloidal stability and aggregation of lignocellulosic materials in aqueous suspension: A review

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