scholarly journals Untangling superposed double layer and structural forces across confined nanoparticle suspensions

2021 ◽  
Author(s):  
Michael Ludwig ◽  
Regine von Klitzing
Keyword(s):  
Double Layer ◽  
Interaction Force ◽  
Charged Surfaces ◽  
Structural Forces ◽  
Nanoparticle Suspensions ◽  
Confined Suspensions ◽  
Force Profiles

Complete interaction force profiles of charged surfaces across confined suspensions were successfully described using a superposition of double layer and structural forces.

Experimental evaluation of additional short ranged repulsion in structural oscillation forces

Soft Matter ◽  
2018 ◽  
Vol 14 (26) ◽  
pp. 5383-5392 ◽  
Author(s):  
Sebastian Schön ◽  
Regine von Klitzing
Keyword(s):  
Ionic Strength ◽  
Double Layer ◽  
Experimental Evaluation ◽  
Silica Nanoparticle ◽  
Nanoparticle Suspensions ◽  
Low Ionic Strength ◽  
Aqueous Silica

Identification of positive synergy at low ionic strength between structural oscillation and double layer forces in confined aqueous silica nanoparticle suspensions.

Electric double layer force between charged surfaces: Effect of solvent polarization

2013 ◽  
Vol 138 (11) ◽  
pp. 114703 ◽  
Author(s):  
Rahul Prasanna Misra ◽  
Siddhartha Das ◽  
Sushanta K. Mitra
Keyword(s):  
Double Layer ◽  
Electric Double Layer ◽  
Effect Of Solvent ◽  
Charged Surfaces ◽  
Solvent Polarization

Effect of finite ion sizes in electric double layer mediated interaction force between two soft charged plates

RSC Advances ◽  
2015 ◽  
Vol 5 (58) ◽  
pp. 46873-46880 ◽  
Author(s):  
Joseph Andrews ◽  
Siddhartha Das
Keyword(s):  
Osmotic Pressure ◽  
Double Layer ◽  
Electric Double Layer ◽  
Interaction Force ◽  
Ion Size

A new theory quantifies the effect of finite ion size in osmotic pressure (Πosm) between two soft charged plates.

scholarly journals Electrical Double-Layer and Ion Bridging Forces between Symmetric and Asymmetric Charged Surfaces in the Presence of Mono- and Divalent Ions

Langmuir ◽  
2017 ◽  
Vol 33 (18) ◽  
pp. 4426-4434 ◽  
Author(s):  
Xiaoyan Liu ◽  
Karen L. Feilberg ◽  
Wei Yan ◽  
Erling H. Stenby ◽  
Esben Thormann
Keyword(s):  
Double Layer ◽  
Electrical Double Layer ◽  
Divalent Ions ◽  
Charged Surfaces

scholarly journals A simple extension of the commonly used fitting equation for oscillatory structural forces in case of silica nanoparticle suspensions

2018 ◽  
Vol 9 ◽  
pp. 1095-1107 ◽  
Author(s):  
Sebastian Schön ◽  
Regine von Klitzing
Keyword(s):  
Experimental Data ◽  
Harmonic Oscillation ◽  
Silica Nanoparticle ◽  
Decay Length ◽  
Interfacial Region ◽  
Simple Extension ◽  
Structural Forces ◽  
Starting Point ◽  
Nanoparticle Suspensions ◽  
The Common

Background: The ordering of molecules or particles in the vicinity of a confining surface leads to the formation of an interfacial region with layers of decreasing order normal to the confining surfaces. The overlap of two interfacial regions gives rise to the well-known phenomenon of oscillatory structural forces. These forces are commonly fitted with an exponentially decaying harmonic oscillation as introduced by Israelachvili (Israelachvili, J. N. Intermolecular & surface forces; Academic Press: San Diego, CA, USA, 1985). From the fit three important parameters are obtained, namely wavelength, amplitude and decay length, which are related to the period, the strength and the correlation length of the oscillatory structural forces, respectively. The paper addresses structural forces between a silica microsphere and a silicon wafer across silica nanoparticle suspensions measured with a colloidal probe AFM. Using the simple fitting procedure with three parameters often leads to underestimation of actually measured forces. The deviation of the fit from the experimental data is especially pronounced at small distances of the confining surfaces and at high concentrations of silica nanoparticles. As a consequence, the parameters of the common fit equation vary with the starting point of the fit. Although the wavelength is least affected and seems to be quite robust against the starting point of the fit, all three parameters show distinct oscillations, with a period similar to the wavelength of the oscillatory structural forces themselves. The oscillations of amplitude and decay length, which are of much higher magnitude, show a phase shift of 180° implying not only a dependence on the starting point of the fit but also on each other. The range affected by this systematic deviation of the fit parameters is much larger than the optically perceived mismatch between fit and experimental data, giving a false impression of robustness of the fit. Results: By introducing an additional term of exponentially decaying nature the data can be fitted accurately down to very small separations and even for high silica nanoparticle concentrations (10 wt %). Furthermore wavelength, amplitude and decay length become independent of the starting point of the fit and in case of the latter two of each other. The larger forces at small separations indicate a more pronounced ordering behavior of the particles in the final two layers before the wall. This behavior is described by the proposed extension of the common fit equation. Conclusion: Thus, the extension increases the accessible data range in terms of separation and concentration and strongly increases the accuracy for all fitting parameters in the system studied here.

Double Layer Forces between Heterogeneous Charged Surfaces

1994 ◽  
Vol 98 (36) ◽  
pp. 9022-9032 ◽  
Author(s):  
S. J. Miklavic ◽  
D. Y. C. Chan ◽  
L. R. White ◽  
T. W. Healy
Keyword(s):  
Double Layer ◽  
Charged Surfaces

An Effective Zeta Potential Fitting Model for Sphere-Plate Interaction Force in Nanoparticle Suspensions

2014 ◽  
Vol 35 (3) ◽  
pp. 338-342 ◽  
Author(s):  
Xiaoting Hong ◽  
Mingyue Mo ◽  
Xiaohui Wu ◽  
Gerold Willing ◽  
K. S. Hui ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Interaction Force ◽  
Nanoparticle Suspensions ◽  
Fitting Model
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