Streaming potential and streaming current measurements at planar solid/liquid interfaces for simultaneous determination of zeta potential and surface conductivity

Werner, Carsten; Zimmermann, Ralf; Kratzmüller, Thomas

doi:10.1016/s0927-7757(01)00725-7

Cited by 102 publications

(85 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Midmore et al [22] came to similar conclusion from electrophoresis data. However, different ratios of Stern layer to diffuse layer conductance were found by Werner et al [43] in their measurement of streaming potentials of materials. They investigated plasma deposited fluorpolymer, and showed that the Stern layer conductance dominated the streaming potential data by a factor of 10 over the diffuse layer conductance.…”

Section: Resultsmentioning

confidence: 84%

The electrokinetic properties of latex particles: comparison of electrophoresis and dielectrophoresis

Ermolina

Morgan

2005

Journal of Colloid and Interface Science

223

255

View full text Add to dashboard Cite

A comprehensive study of the AC and DC electrokinetic properties of submicrometre latex particles as a function of particle size and suspending medium conductivity and viscosity is presented. Electrophoretic mobility and dielectrophoretic cross-over results were measured for particle diameters ranging from 44 to 2000 nm. The zeta potentials of the particles were calculated from the electrophoretic mobility data for different suspending medium conductivities, using various models, with and without the inclusion of surface conduction. The dielectrophoretic data was analysed to derive values for the Stern layer conductance and zeta potentials.  2004 Elsevier Inc. All rights reserved.

show abstract

Section: Resultsmentioning

confidence: 84%

The electrokinetic properties of latex particles: comparison of electrophoresis and dielectrophoresis

Ermolina

Morgan

2005

Journal of Colloid and Interface Science

223

255

View full text Add to dashboard Cite

show abstract

“…Recent advances in the fabrication of ultraconfined fluidic systems such as nanoscale ''lab-on-a-chip'' type devices [1][2][3] and synthetic nanopores [4 -6] raise fundamental questions about the influence of surfaces on ion transport. In particular, surface charges induce electrostatic ion (Debye) screening and electrokinetic effects such as electro-osmosis, streaming potentials, and streaming currents [7][8][9] that may have large effects on conductance in nanochannels, as suggested by studies of colloidal suspensions [10] and biological protein channels [11]. Here we present experiments that directly probe ion transport in the nanoscale regime, and reveal the role of surface charge in governing conductance at low salt concentrations.…”

mentioning

confidence: 85%

Surface-Charge-Governed Ion Transport in Nanofluidic Channels

2004

View full text Add to dashboard Cite

A study of ion transport in aqueous-filled silica channels as thin as 70 nm reveals a remarkable degree of conduction at low salt concentrations that departs strongly from bulk behavior: In the dilute limit, the electrical conductances of channels saturate at a value that is independent of both the salt concentration and the channel height. Our data are well described by an electrokinetic model parametrized only by the surface-charge density. Using chemical surface modifications, we further demonstrate that at low salt concentrations, ion transport in nanochannels is governed by the surface charge. DOI: 10.1103/PhysRevLett.93.035901 PACS numbers: 66.10.-x, 82.65.+r Nanoscale fluidic channels represent a new regime in the study of ion transport. Recent advances in the fabrication of ultraconfined fluidic systems such as nanoscale ''lab-on-a-chip'' type devices [1][2][3] and synthetic nanopores [4 -6] raise fundamental questions about the influence of surfaces on ion transport. In particular, surface charges induce electrostatic ion (Debye) screening and electrokinetic effects such as electro-osmosis, streaming potentials, and streaming currents [7][8][9] that may have large effects on conductance in nanochannels, as suggested by studies of colloidal suspensions [10] and biological protein channels [11]. Here we present experiments that directly probe ion transport in the nanoscale regime, and reveal the role of surface charge in governing conductance at low salt concentrations.Nanofluidic channels [ Fig. 1(a)] were fabricated following a silicate bonding procedure similar to that of Wang et al. [12]. Briefly, channels 50 m wide and 4:5 mm long were patterned between 1:5 mm 1:5 mm reservoirs using electron beam lithography on fused silica substrate. A reactive CHF 3 =O 2 plasma then etched into the fused silica at a rate of 30 nm=min, and was timed to stop when the desired submicron channel depth was attained. The depth of the resulting channel, h, was measured using an -stepper profilometer. The channels were sealed by first spinning a 20 nm layer of sodium silicate from 2% solution onto a flat fused silica chip, then pressing the silicate-coated surface to the patterned channel surface, and finally curing the device at 90 o C for 2 h. The channels were filled by introducing distilled, deionized (18 M cm) water into the large fluidic reservoirs, from which point capillary forces were sufficient to draw the water across the channels. The electrical voltage source and IV converter were connected to the fluidic channel with negligible resistive loss via silver wires inserted into the reservoirs [ Fig. 1(b)]. The channels were cleaned of ionic contaminants using electrophoretic pumping: The ionic current was observed to decay while 10 V were applied across the channels to drive out ionic impurities. The reservoirs were periodically flushed with fresh solution until the current equilibrated to a minimum, which typically took 20 min. This procedure was also followed to replace different dilutions of 1 M potassium ...

show abstract

“…12). This method is rather direct, but requires a range of capillaries with different radii, but identical surface properties [58,59]. iii.…”

Section: Experimental Determination Of Surface Conductivitymentioning

confidence: 99%

Measurement and Interpretation of Electrokinetic Phenomena (IUPAC Technical Report)

Delgado

González‐Caballero

Hunter

et al. 2005

Pure and Applied Chemistry

522

398

View full text Add to dashboard Cite

Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the Measurement and interpretation of electrokinetic phenomena (IUPAC Technical Report)Abstract: In this report, the status quo and recent progress in electrokinetics are reviewed. Practical rules are recommended for performing electrokinetic measurements and interpreting their results in terms of well-defined quantities, the most familiar being the ζ-potential or electrokinetic potential. This potential is a property of charged interfaces, and it should be independent of the technique used for its determination. However, often the ζ-potential is not the only property electrokinetically characterizing the electrical state of the interfacial region; the excess conductivity of the stagnant layer is an additional parameter. The requirement to obtain the ζ-potential is that electrokinetic theories be correctly used and applied within their range of validity. Basic theories and their application ranges are discussed. A thorough description of the main electrokinetic methods is given; special attention is paid to their ranges of applicability as well as to the validity of the underlying theoretical models. Electrokinetic consistency tests are proposed in order to assess the validity of the ζ-potentials obtained. The recommendations given in the report apply mainly to smooth and homogeneous solid particles and plugs in aqueous systems; some attention is paid to nonaqueous media and less ideal surfaces.

show abstract

Streaming potential and streaming current measurements at planar solid/liquid interfaces for simultaneous determination of zeta potential and surface conductivity

Cited by 102 publications

References 20 publications

The electrokinetic properties of latex particles: comparison of electrophoresis and dielectrophoresis

The electrokinetic properties of latex particles: comparison of electrophoresis and dielectrophoresis

Surface-Charge-Governed Ion Transport in Nanofluidic Channels

Measurement and Interpretation of Electrokinetic Phenomena (IUPAC Technical Report)

Contact Info

Product

Resources

About