Electrokinetic properties of polymer and glass surfaces in aqueous solutions: Experimental evidence for swollen surface layers

Voigt, Andreas; Wolf, H.; Lauekner, S.; Neumann, G.; Becker, Robert J.; Richter, L.

doi:10.1016/0142-9612(83)90032-7

Cited by 41 publications

(28 citation statements)

References 11 publications

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“…PE, PS, and PVC films and film adhesives are also available and have been used for sealing microchannels [20,35]. While most results are on native materials, PS has been modified through the use of polyelectrolyte multilayers [26].…”

Section: Polyethylene Polystyrene and Poly(vinyl Chloride)mentioning

confidence: 99%

“…Polyamide films and film adhesives are available and have been used for sealing microchannels [35], and polyimide tubing is available and commonly used. Figure 6a shows z measurements on several different polyamide substrates.…”

Section: Polyamides: Nylon (Pa) Kapton (Polyimide) and Polyurethanementioning

confidence: 99%

“…Most measurements in presence of SDS [35] S, C, PA, PE, PU SP, SC Na 1 None SP and SC results do not match -authors postulate formation of thick gel layer; results of zeta scaling with ionic strength do not match those of other investigators [38] PTFE, P(TFE-co-HFP) EOM Na 1 Citrate A number of anomolous results reported, including deformation of capillaries and violation of no-slip condition at wall [39] P(TFE-co-HFP), PE, PVC EOM Na The difficulty of obtaining accurate and precise zeta potential (or electroosmotic mobility) measurements means that the data show a great deal of scatter in addition to study-to-study variation. Thus, one of the major goals of this paper is to compare the data from numerous studies on a single graph, which is essential to establish conclusions based on the ensemble of data obtained by the research community.…”

Section: Introductionmentioning

confidence: 99%

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Zeta potential of microfluidic substrates: 2. Data for polymers

2004

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Zeta potential data are reviewed for a variety of polymeric microfluidic substrate materials. Many of these materials currently used for microchip fabrication have only recently been employed for generation of electroosmotic flow. Despite their recent history, polymeric microfluidic substrates are currently used extensively for microchip separations and other techniques, and understanding of the surface zeta potential is crucial for experimental design. This paper proposes the use of pC (the negative logarithm of the counterion concentration) as a useful normalization for the zeta potential on polymer substrates in contact with indifferent univalent counterions. Normalizing zeta by pC facilitates comparison of results from many investigators. The sparseness of available data for polymeric substrates prevents complete and rigorous justification for this normalization; however, it is consistent with double layer and adsorption theory. For buffers with indifferent univalent cations, normalization with the logarithm of the counterion concentration in general collapses data onto a single zeta/pC vs. pH curve, and (with the exception of PMMA) the repeatability of the data is quite encouraging. Normalization techniques should allow improved ability to predict zeta potential performance on microfluidic substrates and compare results observed with different parameters.

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Section: Polyethylene Polystyrene and Poly(vinyl Chloride)mentioning

confidence: 99%

Section: Polyamides: Nylon (Pa) Kapton (Polyimide) and Polyurethanementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Zeta potential of microfluidic substrates: 2. Data for polymers

2004

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“…In this study we found that heterogeneous strains adhered significantly better to glass surfaces than homogeneous strains. Note that glass was used, as it has a negative surface charge that is comparable to polyethylene (a biliary stent material) (275 mV and 270 mV, respectively, in 1 mM NaCl pH 7?0: Voigt et al, 1983), and due to its transparency it is readily applicable in the parallel-plate flow chamber. In addition, heterogeneous strains present two different surface charges to their environment, allowing them to adhere to surfaces with different surface properties, thus increasing their chances of successful colonization of different biomedical surfaces.…”

Section: Discussionmentioning

confidence: 99%

Enterococcus faecalis strains show culture heterogeneity in cell surface charge

et al. 2006

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Adhesion of micro-organisms to biotic and abiotic surfaces is an important virulence factor and involves different types of interactions. Enterococcus faecalis, a human commensal and an important opportunistic pathogen, has the ability to adhere to surfaces. Biliary stents frequently become clogged with bacterial biofilms, with E. faecalis as one of the predominant species. Six E. faecalis strains isolated from clogged biliary stents were investigated for the presence of specific biochemical factors involved in their adhesion: aggregation substances (Aggs) and the enterococcal surface protein (encoded by the esp gene). In addition, physico-chemical factors involved in adhesion (zeta potential and cell surface hydrophobicity) were determined, as well as the influence of ox bile on these properties. Two-thirds of the biliary stent isolates displayed culture heterogeneity in the pH dependence of their zeta potentials. Moreover, 24 out of 46 clinical isolates of E. faecalis, including 11 laboratory strains, also displayed such heterogeneity. The culture heterogeneity was demonstrated to be a stable trait, not caused by quorum sensing, not plasmid mediated, and independent of the presence of esp and Agg. Data presented show that culture heterogeneity in zeta potential enhances adhesion to an abiotic surface. A higher prevalence of culture heterogeneity in zeta potential in pathogenic as compared to non-pathogenic isolates could indicate that this phenomenon might play a role in virulence and putatively in pathogenesis.

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“…Olefins such as polystyrene (PS), polyethylene (PE), and poly(vinyl chloride) (PVC) were explored as substrates for microfluidics applications and analytical separations in the 1990s and the beginning of the 21st century [18,19,[34][35][36]. More recently, cyclic olefin copolymers (COCs) such as Zeonor ® , Zeonex ® , and TOPAS ® resins, have started to dominate use of olefins in microfluidics applications-owing to their good optical properties, high chemical resistance, and low water absorbance.…”

Section: Impuritiesmentioning

confidence: 99%

Zeta potential and electroosmotic mobility in microfluidic devices fabricated from hydrophobic polymers: 1. The origins of charge

et al. 2008

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This paper combines new experimental data for electrokinetic characterization of hydrophobic polymers with a detailed discussion of the putative origins of charge at water-hydrophobe interfaces. Complexities in determining the origin of charge are discussed in the context of design and modeling challenges for electrokinetic actuation in hydrophobic microfluidic devices with aqueous working fluids. Measurements of interfacial charge are complicated by slip and interfacial water structuring phenomena (see Part 2, this issue). Despite these complexities, it is shown that (i) several hydrophobic materials, such as Teflon and Zeonor, have predictable electrokinetic properties and (ii) electrokinetic data for hydrophobic microfluidic systems is most consistent with the postulate that hydroxyl ion adsorption is the origin of charge.

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Electrokinetic properties of polymer and glass surfaces in aqueous solutions: Experimental evidence for swollen surface layers

Cited by 41 publications

References 11 publications

Zeta potential of microfluidic substrates: 2. Data for polymers

Zeta potential of microfluidic substrates: 2. Data for polymers

Enterococcus faecalis strains show culture heterogeneity in cell surface charge

Zeta potential and electroosmotic mobility in microfluidic devices fabricated from hydrophobic polymers: 1. The origins of charge

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