Transport number of an ion across an amphoteric ion-exchange membrane in CaCl2NaCl system

Hirata, Yutaka; Sugihara, Gohsuke; Yamauchi, Akira

doi:10.1016/0376-7388(92)87013-n

Cited by 12 publications

(4 citation statements)

References 12 publications

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“…Amphoteric charged (ion-exchange) membranes are expected to be the next-generation ion exchange membranes for the following features: controllability of the charge property by changing the pH of the outer solution and their potential as an anti-fouling material that prevents adsorption of organic molecules and biological macromolecules on the surface [181]. They are expected to be utilized in the biomedical and industrial fields, such as medical devices (e.g., hemodialysis membrane) [182][183][184], separation of ionic drugs and proteins [181,[185][186][187][188] and depletion of electrolytes by nanofiltration [189] or piezodialysis [190][191][192][193] as well as high performance gel actuator [194].…”

Section: Amphoteric Ion Exchange Membranesmentioning

confidence: 99%

Ion exchange membranes: State of their development and perspective

2005

Journal of Membrane Science

1,205

497

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Section: Amphoteric Ion Exchange Membranesmentioning

confidence: 99%

Ion exchange membranes: State of their development and perspective

2005

Journal of Membrane Science

1,205

497

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“…Amphoteric-charged materials have attracted considerable interest in various fields such as polyelectrolyte solutions, , ion-exchange membranes, − polymer latices, hydrogels, protein adsorption onto surfaces, and blood compatibility. − In these materials, the sign of the charge can be controlled by solution pH, resulting in characteristic properties that cannot be shown in a single-charged material. Especially for the protein adsorption behavior on dialysis and ultrafiltration membranes, the pore-surface properties will be of significant importance, the charge state of which is altered by the adsorbed proteins that possess many acidic and basic groups. , In this situation, it is considered that the amphoteric-charged surface can be useful in understanding the interaction between the charge state and proteins in which the balance of surface charge can be varied by solution pH .…”

Section: Introductionmentioning

confidence: 99%

“…Amphoteric-charged materials have attracted considerable interest in various fields such as polyelectrolyte solutions, 1,2 ion-exchange membranes, [3][4][5][6][7][8][9] polymer latices, 10 hydrogels, 11 protein adsorption onto surfaces, 12 and blood compatibility. [13][14][15] In these materials, the sign of the charge can be controlled by solution pH, resulting in characteristic properties that cannot be shown in a singlecharged material.…”

Section: Introductionmentioning

confidence: 99%

Characterization of an Amphoteric-Charged Layer Grafted to the Pore Surface of a Porous Membrane

1998

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Porous membranes having amphoteric charge groups were prepared by heterogeneous graft polymerization from aqueous solution containing acrylic acid and (N,N-dimethylamino)propyl acrylamide. The charging properties of the amphoteric charge groups grafted to the pore surface were investigated by ζ potentials obtained from streaming potential measurements. Theoretical development in terms of the amphoteric pore surface was attempted by introducing a site dissociation model of pH-dependent ζ potentials. The theoretical model is based on the assumption that the surface charge arises only from the protonation and deprotonation of the charged surface groups exposed to electrolyte solution. Good fits between experimental results and theoretical equations were attained, and thereby the isoelectric point, dissociation constant, apparent surface site density, and acid-to-base ratio of the amphoteric pore surface were determined. Depending on the variation in the feed monomer ratio for graft polymerization, these parameters correspondingly changed. If we assumed that the acid-to-base ratio of the amphoteric pore surface corresponds to that in the whole membrane, the net charge density of the membrane quantitatively obtained from the potentiometric titration gave the respective charge densities of acidic and basic groups using the acid-to-base ratio determined from the site dissociation model. Here we proposed an approach to characterize the amphoteric-charged pore surface by the pH-dependent ζ potential and its theoretical modeling.

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“…Amphoteric membranes have been studied for various applications such as separation of low molecular weight organic molecules from inorganic salt mixtures, [147][148][149][150][151][152][153][154] selective ion transport, [155][156][157] drug delivery through membranes of biological interest, 158,159 separation of ionic drugs and proteins, 160,161 and separation of alcohol and water. 162 They are considered to be ''next generation membranes''.…”

Section: Amphoteric Membranesmentioning

confidence: 99%