A zeta-potential model for ionic surfactant adsorption on an ionogenic hydrophobic surface

Keesom, W.H.; Zelenka, R.L; Radke, Clayton J.

doi:10.1016/0021-9797(88)90024-0

Cited by 70 publications

(64 citation statements)

References 30 publications

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“…4 for most experimental cases). Note also that the measured zetapotentials are usually lower than kT/e = 26 mV in these pores due to the low charge density s, 22 which justifies further the use of the linearised P-B equation. The protein flux density J S should be proportional to the effective rate constant defined above and can then be written as…”

Section: 19-25mentioning

confidence: 96%

Protein diffusion through charged nanopores with different radii at low ionic strength

Stroeve

Rahman

Naidu

et al. 2014

Phys. Chem. Chem. Phys.

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The diffusion of two similar molecular weight proteins, bovine serum albumin (BSA) and bovine haemoglobin (BHb), through nanoporous charged membranes with a wide range of pore radii is studied at low ionic strength. The effects of the solution pH and the membrane pore diameter on the pore permeability allow quantifying the electrostatic interaction between the charged pore and the protein.Because of the large screening Debye length, both surface and bulk diffusion occur simultaneously. By increasing the pore diameter, the permeability tends to the bulk self-diffusion coefficient for each protein.By decreasing the pore diameter, the charges on the pore surface electrostatically hinder the transport even at the isoelectric point of the protein. Surprisingly, even at pore sizes 100 times larger than the protein, the electrostatic hindrance still plays a major role in the transport. The experimental data are qualitatively explained using a two-region model for the membrane pore and approximated equations for the pH dependence of the protein and pore charges. The experimental and theoretical results should be useful for designing protein separation processes based on nanoporous charged membranes.

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Section: 19-25mentioning

confidence: 96%

Protein diffusion through charged nanopores with different radii at low ionic strength

Stroeve

Rahman

Naidu

et al. 2014

Phys. Chem. Chem. Phys.

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“…Electrokinetic surface properties are of vital importance in many industrial, biological and medical applications; their determination has proven to be useful and noninvasive [6,7].…”

Section: Introductionmentioning

confidence: 99%

Tangential flow streaming potential measurements: Hydrodynamic cell characterization and zeta potentials of carboxylated polysulfone membranes

Möckel¹,

Staude²,

Dal‐Cin

et al. 1998

Journal of Membrane Science

152

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Computational¯uid dynamics calculations were carried out to ensure that a self-made tangential¯ow mode streaming potential measurement cell meets the hydrodynamic stipulations of laminar, steady and established electrolyte¯ow necessary for reproducible electrokinetic measurements. The calculations show that the cell design meets all of these conditions.Six carboxylated polysulfones with a range of different degrees of substitution (DS) from 0.26 to 1.74 carboxyl groups per polymer repeat unit were synthesized in a two-stage process of lithiation and carboxylation. Ultra®ltration membranes were made from both the unmodi®ed polysulfone and these hydrophilic materials. The zeta potentials of these membrane surfaces were determined in 0.001 M KCl solution as a function of pH. The curves show the theoretically expected pro®les for nonionic and weakly acidic materials. The growing in¯uence of the COOH dissociation on the surface charge formation is indicated by the¯attening of the curves at low pH values. The magnitude of the negative zeta potentials plateau values ranged from À52 to À20 mV. While unmodi®ed PSU has a plateau value of À52 mV this value decreases continuously with increasing DS to À20 mV for the PSU-COOH 1.74 material. It is suggested that this arises from a shift of the electrokinetic shear plane into the bulk electrolyte solution due to an extended swelling layer re¯ecting the enhanced hydrophilicity of these membrane surfaces. # 1998 Elsevier Science B.V.

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“…7. The surface of the regenerated cellulose membrane is known to have a small negative zeta potential at pH 7 in aqueous solution [17]. It is likely that anions pass through the center of the membrane pore as a result of their electrical repulsion against the membrane wall, while some of the K + ions are Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of a static magnetic field on ion transport in a cellulose membrane

Ohata

Tomita

Ikada

2004

Journal of Colloid and Interface Science

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A zeta-potential model for ionic surfactant adsorption on an ionogenic hydrophobic surface

Cited by 70 publications

References 30 publications

Protein diffusion through charged nanopores with different radii at low ionic strength

Protein diffusion through charged nanopores with different radii at low ionic strength

Tangential flow streaming potential measurements: Hydrodynamic cell characterization and zeta potentials of carboxylated polysulfone membranes

Effect of a static magnetic field on ion transport in a cellulose membrane

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