Membrane characterization by solute transport and atomic force microscopy

Singh, Surendra; Khulbe, K.C.; Matsuura, Takeshi; Ramamurthy, Prathap

doi:10.1016/s0376-7388(97)00329-3

Cited by 794 publications

(343 citation statements)

References 37 publications

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“…The pore size of the outer-wall VA CNT membrane was estimated by fitting to the hindered pore-flow solute transport model. This method is commonly used to determine the molecular weight cutoff of membranes for water treatment [37][38][39] . The Stokes radii for various dextran molecules were obtained from their molecular weights using the empirical equation [18][19][20] a ¼ 0.488 Â M 0.437 , which was derived from the Stokes-Einstein relationship.…”

Section: Methodsmentioning

confidence: 99%

A carbon nanotube wall membrane for water treatment

et al. 2015

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Various forms of carbon nanotubes have been utilized in water treatment applications. The unique characteristics of carbon nanotubes, however, have not been fully exploited for such applications. Here we exploit the characteristics and corresponding attributes of carbon nanotubes to develop a millimetre-thick ultrafiltration membrane that can provide a water permeability that approaches 30,000 l m À 2 h À 1 bar À 1 , compared with the best water permeability of 2,400 l m À 2 h À 1 bar À 1 reported for carbon nanotube membranes. The developed membrane consists only of vertically aligned carbon nanotube walls that provide 6-nm-wide inner pores and 7-nm-wide outer pores that form between the walls of the carbon nanotubes when the carbon nanotube forest is densified. The experimental results reveal that the permeance increases as the pore size decreases. The carbon nanotube walls of the membrane are observed to impede bacterial adhesion and resist biofilm formation.

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Section: Methodsmentioning

confidence: 99%

A carbon nanotube wall membrane for water treatment

et al. 2015

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“…Details of these calculations were reported by [39]. If it is assumed that the diffusing solute could be a sphere moving in a continuous fluid of solvent, the diffusivity D AB can be expressed as:…”

Section: Filtration Experimentsmentioning

confidence: 99%

Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes

García-Ivars

Iborra–Clar

Alcaina–Miranda

et al. 2015

Journal of Membrane Science

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ElsevierGarcía Ivars, J.; Iborra Clar, MI.; Alcaina Miranda, MI.; Van Der Bruggen, B. (2015). Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes. ABSTRACTInorganic nanoparticles have been applied as additive in membrane synthesis for improving different properties from the base polymer such as hydrophilicity, fouling resistance or permselectivity. To investigate the changes caused by the presence of the inorganic nanoparticles in the formation of the membrane structure, two different metallic compounds with opposite hydrophilicity were used as additives: hydrophilic zinc oxide (ZnO) and hydrophobic tungsten disulphide (WS 2 ). For this purpose, the effect of these metal nanoparticles at ultra-low concentrations (0.05 and 0.25 wt% metal nanoparticles/polymer ratio) in the preparation of flat-sheet membranes based on polyethersulphone (PES) by immersion-precipitation method was investigated. Nmethyl-2-pyrrolidone (NMP) was used as solvent. The influence of both metal nanoparticles on the characteristics and permselective properties of PES membranes was studied with microscopic observations, contact angle measurements, and filtration experiments. Although the incorporation of metal nanoparticles could turn the system into thermodynamically unstable, the demixing process during formation of membranes was slightly delayed, suppressing the macrovoid formation (remarkably using WS 2 ).Regardless the nature of the metal nanoparticles, results showed an overall improvement in membrane hydrophilicity and permselectivity by adding metal nanoparticles compared to the control PES membrane, demonstrating that the behaviour of both metal nanoparticles at ultra-low concentrations was very similar.

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“…It has been reported by Ramamurthy et. al that [46], the pore density for a 3.5 kDa MWCO membrane was about 3 fold higher than that of the 11 kDa membrane. Similar differences may exist between our 5-and 10-kDa membranes.…”

Section: Recovery Of Ssdnas In Af4mentioning

confidence: 89%

Probing and quantifying DNA–protein interactions with asymmetrical flow field-flow fractionation

Ashby

Schachermeyer

Duan

et al. 2014

Journal of Chromatography A

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Tools capable of measuring binding affinities as well as amenable to downstream sequencing analysis are needed for study of DNA-protein interaction, particularly in discovery of new DNA sequences with affinity to diverse targets. Asymmetrical flow field-flow fractionation (AF4) is an open-channel separation technique that eliminates interference from column packing to the non-covalently bound complex and could potentially be applied for study of macromolecular interaction. The recovery and elution behaviors of the poly(dA) n strand and aptamers in AF4 were investigated. Good recovery of ssDNAs was achieved by judicious selection of the channel membrane with consideration of the membrane pore diameter and the radius of gyration (R g ) of the ssDNA, which was obtained with the aid of a Molecular Dynamics tool. The R g values were also used to assess the folding situation of aptamers based on their migration times in AF4. The interactions between two ssDNA aptamers and their respective protein components were investigated. Using AF4, near-baseline resolution between the free and protein-bound aptamer fractions could be obtained. With this information, dissociation constants of ~16nM and ~57 nM were obtained for an IgE aptamer and a streptavidin aptamer, respectively. In addition, free and protein-bound IgE aptamer was extracted from the AF4 eluate and amplified, illustrating the potential of AF4 in screening ssDNAs with high affinity to targets.Our results demonstrate that AF4 is an effective tool holding several advantages over the existing techniques and should be useful for study of diverse macromolecular interaction systems.

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Membrane characterization by solute transport and atomic force microscopy

Cited by 794 publications

References 37 publications

A carbon nanotube wall membrane for water treatment

A carbon nanotube wall membrane for water treatment

Comparison between hydrophilic and hydrophobic metal nanoparticles on the phase separation phenomena during formation of asymmetric polyethersulphone membranes

Probing and quantifying DNA–protein interactions with asymmetrical flow field-flow fractionation

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