Effect of pH and hydration on the normal and lateral interaction forces between alumina surfaces

Polat, Mehmet; Sato, Kimiyasu; Nagaoka, Takaaki

doi:10.1016/j.jcis.2006.08.058

Cited by 25 publications

(17 citation statements)

References 38 publications

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“…This disagreement can be explained by the possible hydration of the surface at this high pH. Polat et al [29] observed previously that a hydrated surface layer which may develop at high pH values can act as a physical barrier during the approach of the surfaces. Under these conditions authors stated that use of the DLVO theory may not be applicable.…”

Section: Resultsmentioning

confidence: 94%

“…3. It can be seen that though the average spring constant for the population of the cantilevers agreed figure) and the actual force versus probe-to-surface distance curve generated from this data (bottom figure) (adapted from Ref [29]). The raw data is processed using the algorithm shown in the insets.…”

Section: Methodsmentioning

confidence: 99%

“…detector The raw data can be converted to actual force versus probe-to-surface distance curve (Fig. 4(b)) using a proper algorithm shown as inset in the figure (see also [29] for details).…”

Section: Methodsmentioning

confidence: 99%

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Determination of electrostatic potential distribution by atomic force microscopy (AFM) on model silica and alumina surfaces in aqueous electrolyte solutions

Yelken

Polat

2014

Applied Surface Science

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a b s t r a c t AFM was employed as a physicochemical probe to determine the electrostatic potential distribution quantitatively on selected ideal oxide surfaces (quartz 0 0 0 1 and sapphire 0 0 0 1) in aqueous media. The force of interaction between a silicon nitride tip and the oxide surface was measured at a given point under well-defined solution conditions. Relevant theories were used to isolate the electrostatic component from the total force of interaction which was then employed to estimate the surface potential at that point. Repeating the procedure on selected locations generated a potential map of the surface. Comparison of these potentials with those obtained from independent electrokinetic measurements confirmed the validity of the approach.

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Section: Resultsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

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Determination of electrostatic potential distribution by atomic force microscopy (AFM) on model silica and alumina surfaces in aqueous electrolyte solutions

Yelken

Polat

2014

Applied Surface Science

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“…However, it is well known that in the EO effect, experimental evidence indicates that the ζ potential varies as a function of n ∞ [105,106], e.g., by adding salt. Titration experiments have shown that the surface charge should be dependent on the pH and ionic strength [47].…”

Section: A Surface Potential Trap Modelmentioning

confidence: 99%

Self-Consistent Approach to Global Charge Neutrality in Electrokinetics: A Surface Potential Trap Model

Wan

Liao

et al. 2014

Phys. Rev. X

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In this work, we treat the Poisson-Nernst-Planck (PNP) equations as the basis for a consistent framework of the electrokinetic effects. The static limit of the PNP equations is shown to be the charge-conserving Poisson-Boltzmann (CCPB) equation, with guaranteed charge neutrality within the computational domain. We propose a surface potential trap model that attributes an energy cost to the interfacial charge dissociation. In conjunction with the CCPB, the surface potential trap can cause a surface-specific adsorbed charge layer σ. By defining a chemical potential μ that arises from the charge neutrality constraint, a reformulated CCPB can be reduced to the form of the Poisson-Boltzmann equation, whose prediction of the Debye screening layer profile is in excellent agreement with that of the Poisson-Boltzmann equation when the channel width is much larger than the Debye length. However, important differences emerge when the channel width is small, so the Debye screening layers from the opposite sides of the channel overlap with each other. In particular, the theory automatically yields a variation of σ that is generally known as the "charge regulation" behavior, attendant with predictions of force variation as a function of nanoscale separation between two charged surfaces that are in good agreement with the experiments, with no adjustable or additional parameters. We give a generalized definition of the ζ potential that reflects the strength of the electrokinetic effect; its variations with the concentration of surface-specific and surfacenonspecific salt ions are shown to be in good agreement with the experiments. To delineate the behavior of the electro-osmotic (EO) effect, the coupled PNP and Navier-Stokes equations are solved numerically under an applied electric field tangential to the fluid-solid interface. The EO effect is shown to exhibit an intrinsic time dependence that is noninertial in its origin. Under a step-function applied electric field, a pulse of fluid flow is followed by relaxation to a new ion distribution, owing to the diffusive counter current. We have numerically evaluated the Onsager coefficients associated with the EO effect, L 21 , and its reverse streaming potential effect, L 12 , and show that L 12 ¼ L 21 in accordance with the Onsager relation. We conclude by noting some of the challenges ahead.

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“…On the other hand, Polat et al measured normal and lateral interaction forces between HA colloid probe and a sapphire substrate using the atomic force microscope (AFM)-colloid probe method in order to clarify varying these forces with curing period. 15) These measurements showed that, with curing period of the HA, the interaction was repulsive and the frictional forces decreased, respectively. That is, some kind of lubricant acted between the particles with curing period.…”

mentioning

confidence: 97%

Extrusion behavior of mono-calcium aluminate (CaAl2O4) paste

Nagaoka

Sato

Hotta

2008

J. Ceram. Soc. Japan

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The present work describes the extrusion behavior of mono calcium aluminate (CaAl 2 O 4 ; CA) paste in order to develop a new inorganic binder for extrusion. Hydration imparted significant flowability and rigidity to the CA paste. CA paste was successfully extruded using a piston-cylindrical die with low extrusion force, under optimum curing period. Furthermore, even without the addition of the organic binder, a small amount of CA acted as a suitable inorganic binder for extrusion. These good extrusion behaviors such as good flowability and rigidity of these samples were probably caused by much free space filled with water and the lubricating effect between the particles.

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Effect of pH and hydration on the normal and lateral interaction forces between alumina surfaces

Cited by 25 publications

References 38 publications

Determination of electrostatic potential distribution by atomic force microscopy (AFM) on model silica and alumina surfaces in aqueous electrolyte solutions

Determination of electrostatic potential distribution by atomic force microscopy (AFM) on model silica and alumina surfaces in aqueous electrolyte solutions

Self-Consistent Approach to Global Charge Neutrality in Electrokinetics: A Surface Potential Trap Model

Extrusion behavior of mono-calcium aluminate (CaAl2O4) paste

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