Rejection of mineral salts on a gamma alumina nanofiltration membrane Application to environmental process

Alami-Younssi, S.; Larbot, A.; Persin, M.; Sarrazin, J.; Cot, L.

doi:10.1016/0376-7388(94)00302-f

Cited by 70 publications

(26 citation statements)

References 7 publications

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“…In the case of uncharged molecules, mainly size exclusion is thought to be responsible for the separation, whereas concerning the separation of charged species, e.g. ions, both size and charge effects may play a role [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Streaming potential measurements as a characterization method for nanofiltration membranes

Peeters

Mulder

Strathmann

1999

Colloids and Surfaces A: Physicochemical and Engineering Aspect

141

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The streaming potentials of two different nanofiltration membranes were studied with several electrolyte solutions to investigate the influence of salt type and concentration on the zeta potential and kinetic surface charge density of the membranes. The zeta potentials decreased with increasing salt concentration, whereas the kinetic surface charge densities increased. The kinetic surface charge densities could be described by Freundlich isotherms, except in one case, indicating that the membranes had a negligible surface charge. The kinetic surface charge density observed was caused by adsorbed anions. Salt retention measurements showed different mechanisms for salt separation for the two investigated membranes. One membrane showed a salt retention that could be explained by a Donnan exclusion type of separation mechanism, whereas for the other membrane the salt rejection seemed to be a combination of size and Donnan excluion. Comparing the results obtained by the streaming potential measurements with those of the retention measurements, it could be concluded that the membrane with the highest kinetic surface charge density showed the Donnan exclusion type of separation, whereas the membrane with the lower surface charge density showed a separation mechanism that was not totally determined by Donnan exclusion, size effects seemed to play a role as well.

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Section: Introductionmentioning

confidence: 99%

Streaming potential measurements as a characterization method for nanofiltration membranes

Peeters

Mulder

Strathmann

1999

Colloids and Surfaces A: Physicochemical and Engineering Aspect

141

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“…The existence of crystalline domains of varying charge density is likely as α-Al 2 O 3 and γ-Al 2 O 3 both exhibit different points-of-zero-charge (pzc's), estimated at pH 9.1 and pH 8.5 in monovalent salt solution. [150,151] In addition, the Zeta potentials of these materials measured in pH 7.5 electrolyte are ~50 mV and ~25 mV respectively, [152,153] and thus these charged domains are expected to interact differently with anionic DNA. Alterations to pore stoichiometry due to the preferential desorption of O and the aggregation of Al is also expected to result in a distribution of equilibrium constants (pK's) for the protonizable chemical sites across the pore.…”

Section: Nanopore Expansion Kineticsmentioning

confidence: 99%

“…[87] Furthermore, a comparison of the surface charge ) systems. [73,150] Thus, polymer-pore interactions involving electrostatic binding events are expected to be more prominent in Al 2 O 3 nanopores. Hydrophobic interactions between DNA bases and the pore surface may also be prevalent in Al 2 O 3 nanopore systems.…”

mentioning

confidence: 99%

Solid-State Nanopore Sensors for Nucleic Acid Analysis

Venkatesan

Bashir

2011

Nanopores

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Nanopore DNA analysis is an emerging technique that involves electrophoretically driving DNA molecules through a nano-scale pore in solution and monitoring the corresponding change in ionic pore current. This versatile approach permits the label-free, amplification-free analysis of charged polymers (single stranded DNA, double stranded DNA and RNA) ranging in length from single nucleotides to kilobase long genomic DNA fragments with subnanometer resolution.Recent advances in nanopores suggest that this low-cost, highly scalable technology could lend itself to the development of third generation DNA sequencing technologies, promising rapid and reliable sequencing of the human diploid genome for under $1000.Here, we report the development of versatile, nano-manufactured Al 2 O 3 solid-state nanopores and nanopore arrays for rapid, label-free, single-molecule detection and analysis of DNA and protein. This nano-scale technology has proven to be reliable, affordable, and mass producible, and allows for integration with VLSI processes. A detailed characterization of nanopore performance in terms of electrical noise, mechanical robustness and materials analysis is provided, and the functionality of this technology in experimental DNA biophysics is explored.A framework for the application of this technology to medical diagnostics and sequencing is also presented. Specifically, studies involved the detection of DNA-protein complexes, a viable strategy in screening methylation patterns in panels of genes for early cancer detection, and the creation of lipid bilayer coated nanopore sensors, useful in creating hybrid biological/solid-state nanopores for DNA sequencing applications.The concept of a gated nanopore is also presented with preliminary results. The fabrication of this novel system has been enabled by the recent discovery of graphene, a highly versatile material with remarkable electrical and mechanical properties. Direct modulation of the nanopore conductance was observed through the application of potentials to the graphene gate.These exciting results suggest this technology could potentially be useful in slowing down or trapping a DNA molecule in the pore, thereby enabling solid-state nanopore sequencing.iii

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“…1) (Peck andRabbidge 1966, 1969;Biesheuvel et al, 1999;Bakker et al, 2007), to ensure good contact with the soil. A 2 µm thick γ -Al 2 O 3 ceramic membrane purposed to prevent large polymer leakage (Alami-Younssi et al, 1995;Bakker et al, 2007, De Vos andVerweij, 1998) was applied to the base of the cones. The ceramic cone is the substrate carrier for the γ -Al 2 O 3 membrane, and the pores are 160 nm and 2.5 nm respectively.…”

Section: Design and Operational Proceduresmentioning

confidence: 99%

Polymer tensiometers with ceramic cones: direct observations of matric pressures in drying soils

Ploeg

Gooren

Bakker

et al. 2010

Hydrol. Earth Syst. Sci.

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Abstract. Measuring soil water potentials is crucial to characterize vadose zone processes. Conventional tensiometers only measure until approximately −0.09 MPa, and indirect methods may suffer from the non-uniqueness in the relationship between matric potential and measured properties. Recently developed polymer tensiometers (POTs) are able to directly measure soil matric potentials until the theoretical wilting point (−1.6 MPa). By minimizing the volume of polymer solution inside the POT while maximizing the ceramic area in contact with that polymer solution, response times drop to acceptable ranges for laboratory and field conditions. Contact with the soil is drastically improved with the use of coneshaped solid ceramics instead of flat ceramics. The comparison between measured potentials by polymer tensiometers and indirectly obtained potentials with time domain reflectometry highlights the risk of using the latter method at low water contents. By combining POT and time domain reflectometry readings in situ moisture retention curves can be measured over the range permitted by the measurement range of both POT and time domain reflectometry.

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Rejection of mineral salts on a gamma alumina nanofiltration membrane Application to environmental process

Cited by 70 publications

References 7 publications

Streaming potential measurements as a characterization method for nanofiltration membranes

Streaming potential measurements as a characterization method for nanofiltration membranes

Solid-State Nanopore Sensors for Nucleic Acid Analysis

Polymer tensiometers with ceramic cones: direct observations of matric pressures in drying soils

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