Determination of Surface Properties of Membranes Based on Polysulfone Derivatives by Electrokinetic Measurements*

Staude, Eberhard; Düputell, Detlef; Malejka, Frank; Wyszynski, Danuta

doi:10.1080/01932699108913115

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…La mesure du potentiel d'écoulement est la méthode la plus utilisée pour déterminer le potentiel électroci-nétique de la paroi des pores d'une membrane [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Cette technique présente l'avantage de permettre le suivi de l'évolution des propriétés électrocinétiques d'une membrane au cours du processus de filtration.…”

Section: Potentiel D'écoulementunclassified

Caractérisation des propriétés électriques des parois de pores d’une membrane

Fiévet¹,

Szymczyk²

2002

Comptes Rendus. Chimie

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Characterisation of electrical properties of membrane pore walls. The characterisation of the surface electrical properties of membrane materials is critical for understanding and predicting the filtration performances of membranes. In this paper, four simple experimental methods -streaming potential, electro-osmosis, pore conductivity and membrane potential -, allowing the characterisation of the charge state of membrane pore walls are presented. The four experimental parameters provide information about the sign of the electrical net charge. Examples illustrating the influence of the pH, electrolyte concentration and nature on the four experimental parameters are given. The zeta potential can be then deduced from these measurements by means of a model.

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Section: Potentiel D'écoulementunclassified

Caractérisation des propriétés électriques des parois de pores d’une membrane

Fiévet¹,

Szymczyk²

2002

Comptes Rendus. Chimie

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“…For flat porous membranes, streaming potential measurement can be carried out by applying a pressure gradient either along the membrane surface (tangential streaming potential, TSP) − or through the membrane pores (transmembrane streaming potential). − The through-pore technique has the advantage of experimental simplicity but interpretation of experimental data may be difficult when measurements are carried out with multilayer membranes or membranes having selective layers. − In such cases, TSP measurement appears as an alternative method providing direct information about the membrane top layer (i.e., active layer). The tangential technique consists of applying a pressure difference across a thin channel formed by clamping two identical membrane samples separated by a spacer.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Membrane Pore Conductance on Tangential Streaming Potential

et al. 2003

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Tangential streaming potential technique is an attractive way to characterize the electrokinetic properties of various kinds of materials such as films or flat membranes with a dense or a porous structure. However, the interpretation of data in terms of zeta potential is usually carried out by doing the implicit assumption of nonconducting substrates. In the present paper, we investigate the electrokinetic properties of a commercial ultrafiltration membrane, the porous structure of which affects the streaming potential because streaming and conduction currents involved in the streaming potential process do not flow through identical paths (the streaming current flows only through the slit channel formed by the two membrane samples facing each other whereas a non-negligible part of the conduction current is likely to flow through the membrane pores filled with electrolyte solution). The correct zeta potential value is determined from an extrapolation method for which a set of measurements with various channel heights is required. A very good agreement is obtained with zeta potential values deduced from consecutive streaming potential and total conductance measurements (referred in the text as the direct method). The ratio of the correct zeta potential to the apparent one (given by Helmholtz-Smoluchowski equation) is dependent on the pH which suggests a non-negligible contribution of surface conductance within the membrane pores.

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“…Characterization of the pore-surface charge of a porous material has been extensively studied by electrokinetic measurements, − and the majority of the studies have been based on the surface potential (ζ potential). The magnitude of the ζ potential, however, depends on the pore morphology, such as pore size and surface roughness. − The ζ potential calculated by the Helmholtz−Smoluchowski equation cannot be precisely obtained as an absolute value in the porous membrane system unless the pore morphology is ideally cylindrical.…”

Section: Introductionmentioning

confidence: 99%

“…Characterization of the pore-surface charge of a porous material has been extensively studied by electrokinetic measurements, [16][17][18][19][20][21][22][23][24][25] and the majority of the studies have been based on the surface potential (ζ potential). The magnitude of the ζ potential, however, depends on the pore morphology, such as pore size and surface roughness.…”

Section: Introductionmentioning

confidence: 99%

Characterization of an Amphoteric-Charged Layer Grafted to the Pore Surface of a Porous Membrane

1998

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Porous membranes having amphoteric charge groups were prepared by heterogeneous graft polymerization from aqueous solution containing acrylic acid and (N,N-dimethylamino)propyl acrylamide. The charging properties of the amphoteric charge groups grafted to the pore surface were investigated by ζ potentials obtained from streaming potential measurements. Theoretical development in terms of the amphoteric pore surface was attempted by introducing a site dissociation model of pH-dependent ζ potentials. The theoretical model is based on the assumption that the surface charge arises only from the protonation and deprotonation of the charged surface groups exposed to electrolyte solution. Good fits between experimental results and theoretical equations were attained, and thereby the isoelectric point, dissociation constant, apparent surface site density, and acid-to-base ratio of the amphoteric pore surface were determined. Depending on the variation in the feed monomer ratio for graft polymerization, these parameters correspondingly changed. If we assumed that the acid-to-base ratio of the amphoteric pore surface corresponds to that in the whole membrane, the net charge density of the membrane quantitatively obtained from the potentiometric titration gave the respective charge densities of acidic and basic groups using the acid-to-base ratio determined from the site dissociation model. Here we proposed an approach to characterize the amphoteric-charged pore surface by the pH-dependent ζ potential and its theoretical modeling.

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Determination of Surface Properties of Membranes Based on Polysulfone Derivatives by Electrokinetic Measurements*

Cited by 8 publications

References 9 publications

Caractérisation des propriétés électriques des parois de pores d’une membrane

Caractérisation des propriétés électriques des parois de pores d’une membrane

Influence of the Membrane Pore Conductance on Tangential Streaming Potential

Characterization of an Amphoteric-Charged Layer Grafted to the Pore Surface of a Porous Membrane

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