scholarly journals Divalent Ion Specific Outcomes on Stern Layer Structure and Total Surface Potential at the Silica:Water Interface

2021 ◽  
Author(s):  
Emily Ma ◽  
Franz M. Geiger
Keyword(s):  
Surface Potential ◽  
Layer Structure ◽  
Stern Layer

scholarly journals Determination of Surface Potential and Electrical Double-Layer Structure at the Aqueous Electrolyte-Nanoparticle Interface

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Matthew A. Brown ◽  
Zareen Abbas ◽  
Armin Kleibert ◽  
Richard G. Green ◽  
Alok Goel ◽  
...  
Keyword(s):  
Double Layer ◽  
Surface Potential ◽  
Electrical Double Layer ◽  
Aqueous Electrolyte ◽  
Layer Structure ◽  
Double Layer Structure

A how-to approach for estimation of surface/Stern potentials considering ionic size and polarization

The Analyst ◽  
2015 ◽  
Vol 140 (21) ◽  
pp. 7217-7224 ◽  
Author(s):  
Xinmin Liu ◽  
Feinan Hu ◽  
Wuquan Ding ◽  
Rui Tian ◽  
Rui Li ◽  
...  
Keyword(s):  
Surface Potential ◽  
Diffuse Layer ◽  
Stern Layer ◽  
Stern Potential ◽  
Ionic Size ◽  
The Relationship ◽  
Ionic Volume

Based on the effects of ionic volume in Stern layer and polarization in diffuse layer, the relationship between surface potential and Stern potential is quantified.

scholarly journals Divalent Ion-Specific Outcomes on Stern Layer Structure and Total Surface Potential at the Silica:Water Interface

2021 ◽  
Author(s):  
Emily Ma ◽  
Franz Geiger
Keyword(s):  
Layer Structure ◽  
Divalent Cations ◽  
Potential Drop ◽  
Fused Silica ◽  
Interfacial Structure ◽  
Nonlinear Susceptibility ◽  
Stern Layer ◽  
Phase Measurements ◽  
Total Potential ◽  
Interfacial Potential

The second-order nonlinear susceptibility, chi(2), in the Stern layer, and the total interfacial potential drop, Phi(0)tot, across the oxide:water interface are estimated from SHG amplitude and phase measurements for divalent cations (Mg2+, Ca2+, Sr2+, Ba2+) at the silica:water interface at pH 5.8 and various ionic strengths. We find that interfacial structure and total potential depend strongly on ion valency. We observe statistically significant differences between the experimentally determined chi(2) value for NaCl and that of the alkali earth series, but smaller differences between ions of the same valency in that series. These differences are particularly pronounced at intermediate salt concentrations, which we attribute to the influence of hydration structure in the Stern layer. Furthermore, we corroborate the differences by examining the effects of anion substitution (SO4 2- for Cl-). Finally, we identify that hysteresis in measuring the reversibility of ion adsorption and desorption at fused silica in forward and reverse titrations manifests itself both in Stern layer structure and in total interfacial potential for some of the salts, most notable CaCl2 and MgSO4, but less so for BaCl2 and NaCl.

scholarly journals Correction to “Stern Layer Structure and Energetics at Mica–Water Interfaces”

2019 ◽  
Vol 123 (4) ◽  
pp. 2690-2690
Author(s):  
Ian C. Bourg ◽  
Sang Soo Lee ◽  
Paul Fenter ◽  
Christophe Tournassat
Keyword(s):  
Layer Structure ◽  
Stern Layer

scholarly journals Stern Layer Structure and Energetics at Mica–Water Interfaces

2017 ◽  
Vol 121 (17) ◽  
pp. 9402-9412 ◽  
Author(s):  
Ian C. Bourg ◽  
Sang Soo Lee ◽  
Paul Fenter ◽  
Christophe Tournassat
Keyword(s):  
Layer Structure ◽  
Stern Layer

Backscattered Electron Imaging of GaAs/AlGaAs Super Lattice Structures with an Ultra-High- Resolution SEM

1988 ◽  
Vol 46 ◽  
pp. 204-205
Author(s):  
Kazumichi Ogura ◽  
Michael M. Kersker
Keyword(s):  
High Resolution ◽  
Layer Structure ◽  
High Sensitivity ◽  
Beam Current ◽  
Electron Beam Current ◽  
Lattice Structures ◽  
Super Lattice ◽  
Different Types ◽  
Backscattered Electron ◽  
Electron Imaging

Backscattered electron (BE) images of GaAs/AlGaAs super lattice structures were observed with an ultra high resolution (UHR) SEM JSM-890 with an ultra high sensitivity BE detector. Three different types of super lattice structures of GaAs/AlGaAs were examined. Each GaAs/AlGaAs wafer was cleaved by a razor after it was heated for approximately 1 minute and its crosssectional plane was observed.First, a multi-layer structure of GaAs (100nm)/AlGaAs (lOOnm) where A1 content was successively changed from 0.4 to 0.03 was observed. Figures 1 (a) and (b) are BE images taken at an accelerating voltage of 15kV with an electron beam current of 20pA. Figure 1 (c) is a sketch of this multi-layer structure corresponding to the BE images. The various layers are clearly observed. The differences in A1 content between A1 0.35 Ga 0.65 As, A1 0.4 Ga 0.6 As, and A1 0.31 Ga 0.69 As were clearly observed in the contrast of the BE image.

Generation of 4H and 6H Structures During the Hexagonal-Rhombohedral Transformation in Dy2Co17

1975 ◽  
Vol 33 ◽  
pp. 38-39
Author(s):  
C. W. Allen ◽  
D. L. Kuruzar
Keyword(s):  
Elevated Temperatures ◽  
Layer Structure ◽  
Transition Element ◽  
Temperature Structure ◽  
Allotropic Transformation ◽  
Layer Plane ◽  
Planar Defects ◽  
Topologically Close Packed ◽  
Transformation Mechanisms ◽  
Shear Transformation

The rare earth/transition element intermetallics R2T17 are essentially topologically close packed phases for which layer structure models have already been presented. Many of these compounds are known to undergo allotropic transformation of the type at elevated temperatures. It is not unexpected that shear transformation mechanisms are involved in view of the layering character of the structures. The transformations are evidently quite sluggish, illustrated in furnace cooled Dy2Co17 by the fact that only rarely has the low temperature rhombohedral form been seen. The more usual structures observed so far in furnace cooled alloys include 4H and 6H in Dy2Co17 (Figs. 1 and 2) . In any event it is quite clear that the general microstructure is very complicated as a consequence of the allotropy, illustrated in Fig. 3. Numerous planar defects in the layer plane orientation are evident as are non-layer plane defects inherited from a high temperature structure.

The effects of surface absorbed monolayer microdiffraction patterns

1988 ◽  
Vol 46 ◽  
pp. 680-681
Author(s):  
M. Pan ◽  
J.M. Cowley
Keyword(s):  
Surface Potential ◽  
Electron Probe ◽  
Potential Distribution ◽  
Crystal Surface ◽  
Normal Direction ◽  
Surface Image ◽  
Extended Surface ◽  
Gas Molecules ◽  
Surface Nature ◽  
Electron Microdiffraction

Electron microdiffraction patterns, obtained when a small electron probe with diameter of 10-15 Å is directed to run parallel to and outside a flat crystal surface, are sensitive to the surface nature of the crystals. Dynamical diffraction calculations have shown that most of the experimental observations for a flat (100) face of a MgO crystal, such as the streaking of the central spot in the surface normal direction and (100)-type forbidden reflections etc., could be explained satisfactorily by assuming a modified image potential field outside the crystal surface. However the origin of this extended surface potential remains uncertain. A theoretical analysis by Howie et al suggests that the surface image potential should have a form different from above-mentioned image potential and also be smaller by several orders of magnitude. Nevertheless the surface potential distribution may in practice be modified in various ways, such as by the adsorption of a monolayer of gas molecules.

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