Experimental progress in the characterization of colloidal systems

Horn, D.; Klingler, J.; Schorf, W.; Graf, Karlheinz

doi:10.1007/bfb0118105

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…The light scattering method is, like every other experimental technique, not free of limitations. Those concerning particle size measurements are described, for example, in a recent review by D. Horn et al and discussed by A. Rawle . Particulary the position of for example a rodlike micelle or a surfactant loop in the laser beam may change the size data.…”

Section: Discussionmentioning

confidence: 99%

Adsorption Pattern of Mixtures of Trimethylammonium-Modified Hydroxyethylcellulose and Sodium Dodecyl Sulfate at Solid−Liquid Interfaces

2004

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We studied mixtures of aqueous solutions of cationic hydroxyethylcellulose JR400 polymer and anionic sodium dodecyl sulfate using dynamic light scattering and atomic force microscopy (AFM). A ternary phase diagram was established showing three interesting realms of the polymer-surfactant-water mixture: a preprecipitation area of lowered viscosity (polymer excess) compared to the pure polymer solution, a postprecipitation area (resolubilization at surfactant excess), and highly diluted samples with a stoichiometrical surfactant-polymer ratio close to that of maximum precipitation. Samples with various compositions representing these areas were imaged by atomic force microscopy on mica and on hydrophobically modified silica in contact mode. A correlation between light scattering data concerning particle size and, more important, structuring in the bulk on one hand and AFM images on the other hand was observed. It was revealed that the influence of surface properties is of less importance for adsorption, compared to the influence of the mixture in the bulk, provided that the mixture is prepared prior to adsorption.

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Section: Discussionmentioning

confidence: 99%

Adsorption Pattern of Mixtures of Trimethylammonium-Modified Hydroxyethylcellulose and Sodium Dodecyl Sulfate at Solid−Liquid Interfaces

2004

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“…The experimental system was recently described in detail in Mabry et al Using total internal reflection fluorescence microscopy, we collected image sequences of BFA (Invitrogen) molecules adsorbed to the planar interface of a water–methanol solution and a fused silica wafer coated with a TMS monolayer to render it hydrophobic (water contact angle 91° ± 1°). Molecules in solution underwent diffusion that was much faster ( D ∼ 10 2 μm 2 s –1 ) than for molecules on the surface, and so only adsorbed molecules were distinguished from background fluorescence in these images with 0.115 s acquisition times. The bulk concentration of BFA was chosen to achieve extremely dilute surface coverage of adsorbed molecules (∼0.01 molecules μm –2 ) and ranged from 0.1 pM to 1 nM.…”

Section: Experimental Methodsmentioning

confidence: 99%

Tuning the Flight Length of Molecules Diffusing on a Hydrophobic Surface

Mabry

Schwartz

2015

J. Phys. Chem. Lett.

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Transport at solid-liquid interfaces is critical to self-assembly, biosensing, and heterogeneous catalysis, but surface diffusion remains difficult to characterize and rationally manipulate, due to the inherent heterogeneity of adsorption on solid surfaces. Using single-molecule tracking, we characterized the diffusion of a fluorescent long-chain surfactant on a hydrophobic surface, which involved periods of confinement alternating with bulk-mediated "flights". The concentration of methanol in solution was varied to tune the strength of the hydrophobic surface-molecule interaction. The frequency of confinement had a nonmonotonic dependence on methanol concentration that reflected the relative influence of anomalously strong adsorption sites. By carefully accounting for the effect of this surface heterogeneity, we demonstrated that flight lengths increased monotonically as the hydrophobic attraction decreased, in agreement with theoretical predictions for bulk-mediated surface diffusion. The theory provided an accurate description of surface diffusion, despite the system being heterogeneous, and can be leveraged to optimize molecular search and assembly processes.

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Untersuchung der Wechselwirkung zwischen Polyvinylpyrrolidon und Natriumdodecylsulfat durch Fluoreszenz-Korrelationsspektroskopie

1999

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Polymer‐Tensid‐Wechselwirkungen sind bei vielen industriellen Prozessen und in Konsumgütern von Bedeutung. Die Fluoreszenz‐Korrelationsspektroskopie ist eine sehr nützliche Methode für die Untersuchung der Komplexbildung, was hier an einem etablierten Modellsystem, der Aggregation von Natriumdodecylsulfat (█) und Polyvinylpyrrolidon (█), in Gegenwart von fluoreszenzmarkierten Natriumdecylsulfatmolekülen (█) als Sonde gezeigt wird (siehe Bild). cT = Tensidkonzentration, dfl = hydrodynamische Größe der Sonde.

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Experimental progress in the characterization of colloidal systems

Cited by 6 publications

References 22 publications

Adsorption Pattern of Mixtures of Trimethylammonium-Modified Hydroxyethylcellulose and Sodium Dodecyl Sulfate at Solid−Liquid Interfaces

Adsorption Pattern of Mixtures of Trimethylammonium-Modified Hydroxyethylcellulose and Sodium Dodecyl Sulfate at Solid−Liquid Interfaces

Tuning the Flight Length of Molecules Diffusing on a Hydrophobic Surface

Untersuchung der Wechselwirkung zwischen Polyvinylpyrrolidon und Natriumdodecylsulfat durch Fluoreszenz-Korrelationsspektroskopie

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