Ion-size effect at the surface of a silica hydrosol

Tikhonov, A. M.

doi:10.1063/1.3056663

Cited by 24 publications

(29 citation statements)

References 41 publications

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“…The electron density in the surface layer of the sol enriched with cesium hydroxide is increased to a value corresponding to the surface density of Cs + ions (ne = 54) δΘ = (5 ± 1) · 10 18 m −2 . These values are in agreement with the values previously obtained within capillary wave models [2,8,13].…”

supporting

confidence: 92%

“…In contrast to the previous studies, the data are analyzed within a self-consistent approach that makes it possible to reconstruct both the electron density profiles perpendicular to the hydrosol surface and spectra of the height-height correlation function in the surface plane without any prior information on the surface structure [6,7]. Figure 1 shows a qualitative four-layer model of the structure of the hydrosolair interface proposed in [2,8]. This model is based on the structural parameters extracted from synchrotron radiation X-ray reflectometry data with a photon energy of about 15 keV.…”

mentioning

confidence: 99%

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Model-Independent X-Ray Scattering Study of a Silica Sol Surface

et al. 2018

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The structure of the adsorbed layer of alkali ions on the surface of colloidal silica solutions with a particle size of 27 nm has been studied by reflectometry and diffuse scattering of synchrotron radiation with a photon energy of about 71 keV. Electron density profiles in the direction perpendicular to the surface have been reconstructed from experimental data and spectra of the correlation function of heights in the surface plane have been obtained. The revealed deviation of the integral and frequency characteristics of the roughness spectra of the silica sol surface from predictions of the capillary-wave theory is of a fundamental character. This deviation is due to the contribution from roughnesses with low spatial frequencies ν < 10 −4 nm 1 and to the interference of diffuse scattering from different layer interfaces of the surface structure.

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confidence: 92%

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confidence: 99%

Model-Independent X-Ray Scattering Study of a Silica Sol Surface

et al. 2018

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“…57 The nature and composition of the physical ordering of ions at interfaces has been shown to be dependent on ion identity (and thus characteristics such as size of the ions), and our data support such a model with respect to the glass interface. 58,59 …”

Section: Resultsmentioning

confidence: 99%

Dye Diffusion at Surfaces: Charge Matters

2010

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Fluorescence correlation spectroscopy and single molecule burst analysis were used to measure the effects of glass surface interactions on the diffusion of two common fluorescent dyes, one cationic and one anionic. The effects of dye–surface interactions on measured diffusion rates as a function of distance from the surface were investigated. Use of a three-axis piezo stage, combined with reference calibration measurements, enabled the accurate acquisition of surface-distance-dependent transport data. This analysis reveals attractive interactions between the cationic dye and the surface, which significantly alter the extracted diffusion values and persist in the measurements up to 1.0 μm from the surface. The Coulomb attraction between the cationic dye and the surface also results in rare, long-lived association events that lead to irreproducibility in extracted diffusion values. In addition to an assignment of the association lifetime for these events, this paper demonstrates that, if experiments must be performed with cationic probes near a glass surface, the use of solution electrolytes can eliminate deleterious dye–surface interactions, as the dyes were tested in a variety of environments. Finally, our data demonstrate that a better dye choice is an anionic probe, which exhibits no depth dependence of diffusion characteristics above a glass surface.

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“…The electric field near the surface of the loose monolayer of nanoparticles, which orients the dipoles of DSPC molecules at the initial time, reaches E > 10 9 V/m [31]. The voltage drop ∆V across the thickness of the bilayer is ∆V = Ed > 7 V; i.e., the condi-tion for its electric instability or electroporation is certainly satisfied (∆V ≥ 0.1 V) [36][37][38][39].…”

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confidence: 98%

“…Within several days of aging of the sample, nanoparticles in the surface layer of the silica sol are redistributed and a loose monolayer is formed. As a result, the distance between the plane of the closest approach of anion particles and the surface is ∼ 100Å, whereas Na + cations are accumulated immediately on the interface in a thin layer of the space charge with the thickness d 0 ∼ 20Å [30,31].…”

mentioning

confidence: 99%

Kinetics of the formation of a phospholipid multilayer on a silica sol surface

Tikhonov¹,

Асадчиков²,

Volkov³

et al. 2016

Jetp Lett.

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The ordering of a multilayer consisting of DSPC bilayers on a silica sol substrate is studied within the model-independent approach to the reconstruction of profiles of the electron density from X-ray reflectometry data. It is found that the electroporation of bilayers in the field of anion silica nanoparticles significantly accelerates the process of their saturation with Na + and H2O, which explains both a relatively small time of formation of the structure of the multilayer of (1 − 7) × 10 5 s and 13% excess of the electron density in it.

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Ion-size effect at the surface of a silica hydrosol

Abstract: The author used synchrotron x-ray reflectivity to study the ion-size effect for alkali ions (Na + ,

Cited by 24 publications

References 41 publications

Model-Independent X-Ray Scattering Study of a Silica Sol Surface

Model-Independent X-Ray Scattering Study of a Silica Sol Surface

Dye Diffusion at Surfaces: Charge Matters

Kinetics of the formation of a phospholipid multilayer on a silica sol surface

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