Thickness of the particle-free layer near charged interfaces in suspensions of like-charged nanoparticles

Kosior, Dominik; Gvaramia, Manuchar; Scarratt, Liam R. J.; Maroni, Plinio; Trefalt, Gregor; Borkovec, Michal

doi:10.1039/d1sm00584g

Cited by 4 publications

(3 citation statements)

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“…Our findings might be even more interesting in the light of our previous study on the particle-free layer in suspensions of charged nanoparticles next to a like-charged solid substrate. 41 In that study, we used three different techniques (optical reflectivity, quartz crystal microbalance, and AFM) to measure the depletion of nanoparticles (silica and sulfate latex) near silica substrate. First, similar inverse square root dependence of the measured layer thickness on the particle volume fraction was found.…”

Section: Resultsmentioning

confidence: 99%

Depletion of Polyelectrolytes near Like-Charged Substrates Probed by Optical Reflectivity

2022

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Salt-free polyelectrolyte solutions form a polyelectrolytefree depletion layer near like-charged solid interfaces. This evidence is provided by optical reflectivity measurements from planar silica substrates in contact with aqueous solutions of sodium poly(styrene sulfonate). Analysis of the observed reflectivity signal, which features unusual negative signals and optical matching points, with a two-slab model demonstrates the existence of such a polyelectrolyte-free depletion layer. Moreover, the applied model permits the extraction of the corresponding layer thickness, which typically is several tenths of nanometers. This thickness decreases as the inverse square root of the polyelectrolyte concentration, but the actual values exceed the expected Debye length substantially. These results clearly provide independent evidence for the existence of a polyelectrolyte-free depletion layer, as previously suggested on the basis of direct force measurements with the atomic force measurement.

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Section: Resultsmentioning

confidence: 99%

Depletion of Polyelectrolytes near Like-Charged Substrates Probed by Optical Reflectivity

2022

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“…The nanoparticle and microparticle deposition kinetics was extensively studied by various experimental techniques comprising optical microscopy, atomic force microscopy (AFM), ,− scanning electron microscopy (SEM), ,− ellipsometry, − reflectometry, , and the quartz crystal microbalance (QCM). − …”

Section: Introductionmentioning

confidence: 99%

“…The anisotropic molecule shape is also common among biocolloids such as DNA fragments, 17−19 proteins, 20,21 viruses, 22,23 and bacteria 24,25 comprising the common bacterial strains such as Escherichia coli, Sphingomonas alaskensis, and Hylemonella gracilis. 26,27 The nanoparticle and microparticle deposition kinetics was extensively studied by various experimental techniques compris-ing optical microscopy, 28 atomic force microscopy (AFM), 11,29−31 scanning electron microscopy (SEM), 11,32−34 ellipsometry, 35−37 reflectometry, 38,39 and the quartz crystal microbalance (QCM). 39−43 However, few works were focused on measurements of anisotropic particle deposition kinetics.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Anisotropic Particle Deposition: Prolate Spheroid Layers on Mica

et al. 2022

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Anisotropic particle deposition was investigated using the streaming potential method complemented with the atomic force microscopy (AFM) determination of the absolute particle coverage. The polymer particles were synthesized using the stretching procedure with consecutive oxidation of surface hydroxyl groups and coupling of polyethyleneimine. The bulk particle physicochemical properties were characterized by scanning electron microscopy (SEM), dynamic light scattering, and laser Doppler velocimetry. The particles were positively charged in the pH range of 3−10, exhibiting a prolate spheroid shape with an axis ratio of five. Thorough AFM and in situ optical microscopy measurements yielded the adsorption kinetics of particles under the diffusioncontrolled regime. The experimental data were adequately interpreted in terms of the random sequential adsorption model with the surface blocking function derived from the scaled particle theory. The root-mean-square (rms) parameter of the layers for a broad range of particle coverage was also determined and interpreted using the topographical model developed in this work. The experiments were complemented by the measurements of the streaming potential of particle layers under various ionic strengths and pHs. The ζ (zeta)-potential data acquired in this way enabled to determine the universal hydrodynamic function describing the dependence of the streaming potential on the particle coverage. The function was used to express the ζ-potential of surfaces covered by particles in terms of substrate rms. It was argued that the acquired results, in addition to being significanct to basic science, can be exploited as useful reference systems for quantitative interpretation of bioparticle deposition on abiotic surfaces.

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Nanoparticle and bioparticle deposition kinetics

Adamczyk

Morga

Nattich-Rak

et al. 2022

Advances in Colloid and Interface Science

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Thickness of the particle-free layer near charged interfaces in suspensions of like-charged nanoparticles

Abstract: When a suspension of charged nanoparticles is in contact with a like-charged water-solid interface, next to this interface a particle-free layer is formed. The present study provides reliable measurements of...

Cited by 4 publications

References 54 publications

Depletion of Polyelectrolytes near Like-Charged Substrates Probed by Optical Reflectivity

Depletion of Polyelectrolytes near Like-Charged Substrates Probed by Optical Reflectivity

Mechanisms of Anisotropic Particle Deposition: Prolate Spheroid Layers on Mica

Nanoparticle and bioparticle deposition kinetics

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