Extended Electrokinetic Characterization of Flat Solid Surfaces

Werner, Carsten; Körber, Heinz; Zimmermann, Ralf; Dukhin, S. S.; Jacobasch, H.‐J.

doi:10.1006/jcis.1998.5787

Cited by 270 publications

(303 citation statements)

References 36 publications

Supporting

Mentioning

296

Contrasting

Unclassified

Order By: Relevance

“…[2][3][4] Others have concentrated on the electrical properties of single well-defined channels. [5][6][7][8][9][10] Similarly, in a recent paper, we demonstrated intrinsic electrokinetic molecular hydrogen production by flowing pure water through metal microchannels.…”

Section: Introductionsupporting

confidence: 60%

Electrokinetic Power Generation from Liquid Water Microjets

Duffin

Saykally

2008

J. Phys. Chem. C

View full text Add to dashboard Cite

Although electrokinetic effects are not new, only recently have they been investigated for possible use in energy conversion devices. We have recently reported the electrokinetic generation of molecular hydrogen from rapidly flowing liquid water microjets [Duffin et al. JPC-C 2007, 111, 12031]. Here, we describe the use of liquid water microjets for direct conversion of electrokinetic energy to electrical power. Previous studies of electrokinetic power production have reported low efficiencies (~3%), limited by back conduction of ions at the surface and in the bulk liquid. Liquid microjets eliminate energy dissipation due to back conduction and, measuring only at the jet target, yield conversion efficiencies exceeding 10%.

show abstract

Section: Introductionsupporting

confidence: 60%

Electrokinetic Power Generation from Liquid Water Microjets

Duffin

Saykally

2008

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…30,37 In brief, the instrument permits to perform streaming potential and streaming current measurements across a rectangular streaming channel formed by two parallel sample surfaces ͑20ϫ 10 mm 2 ͒ at varied composition of the electrolyte. For the characterization of the sBLMs a channel height of 30 m was used.…”

Section: E Electrokinetic Measurementsmentioning

confidence: 99%

Charging and structure of zwitterionic supported bilayer lipid membranes studied by streaming current measurements, fluorescence microscopy, and attenuated total reflection Fourier transform infrared spectroscopy

et al. 2009

Self Cite

View full text Add to dashboard Cite

The authors report on the characterization of the charge formation at supported bilayer lipid membranes (sBLMs) prepared from the zwitterionic lipid 1,2-dioleoyl-sn-glycero-3-phosphatidylcholine on planar silicon dioxide substrates. The charging of the sBLMs was studied in KCl solutions of different ionic strengths between 0.1 and 10 mM by streaming current measurements. In addition, attenuated total reflection Fourier transform infrared spectroscopy and fluorescence microscopy were applied to determine the lipid concentration in the membrane and to study the influence of the harsh conditions (pH 9-2, shear forces) during the electrokinetic measurements on the membrane stability and the lipid diffusion coefficient. The sBLMs were found to be extremely stable. Isoelectric points of about 4 revealed that unsymmetrical adsorption of hydroxide and hydronium ions determined the charging of the outer leaflet of the membrane in the investigated pH range. The diffusion coefficients were found to be rather independent on the ionic strength at neutral and alkaline pH. However, significantly decreased lipid diffusion at pH<4 indicated a charge-induced transition of the fluidic bilayer into a gel/ordered-phase bilayer.

show abstract

“…Streaming currents have been primarily studied on systems involving many channels in parallel, using materials such as sandstone cores [12], porous glass [11], and columns packed with latex beads [13]. While studies have appeared on single channels in the micron range [6,14,15], nanofabrication now permits us to investigate streaming currents in well-defined, nanoscale geometries where double layers may overlap.…”

mentioning

confidence: 99%

Streaming Currents in a Single Nanofluidic Channel

2005

View full text Add to dashboard Cite

We report measurements of the streaming current, an electrical current generated by a pressure-driven liquid flow, in individual rectangular silica nanochannels down to 70 nm in height. The streaming current is observed to be proportional to the pressure gradient and increases with the channel height. As a function of salt concentration, it is approximately constant below 10 mM, whereas it strongly decreases at higher salt. Changing the sign of the surface charge is found to reverse the streaming current. The data are best modeled using a nonlinear Poisson-Boltzmann theory that includes the salt-dependent hydration state of the silica surface.

show abstract

Extended Electrokinetic Characterization of Flat Solid Surfaces

Cited by 270 publications

References 36 publications

Electrokinetic Power Generation from Liquid Water Microjets

Electrokinetic Power Generation from Liquid Water Microjets

Charging and structure of zwitterionic supported bilayer lipid membranes studied by streaming current measurements, fluorescence microscopy, and attenuated total reflection Fourier transform infrared spectroscopy

Streaming Currents in a Single Nanofluidic Channel

Contact Info

Product

Resources

About