Application of chronopotentiometry to determine the thickness of diffusion layer adjacent to an ion-exchange membrane under natural convection

Larchet, C.; Nouri, S.; Auclair, B.; Dammak, L.; Nikonenko, Victor

doi:10.1016/j.cis.2008.01.007

Cited by 127 publications

(89 citation statements)

References 34 publications

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“…In the specific case of ion-exchange membranes being The distortion of the diffusion boundary layer by gravitational convection was investigated by Larchet et al [82]. It has been found that the thickness of the diffusion boundary layer decreases significantly when the gravitational convection is activated.…”

Section: Gravitational Convectionmentioning

confidence: 99%

Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

Martí-Calatayud

García-Gabaldón

Pérez-Herranz

et al. 2011

Journal of Membrane Science

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Acknowledgements / Agradecimientos / AgraïmentsEn primer lugar quisiera agradecer a Valentín y a Montse por haberme dado la oportunidad de investigar con ellos, por introducirme en un mundo que me ha fascinado, por haberme dirigido, por haberme ayudado en momentos de desasosiego; porque, en definitiva, creo que hemos formado un gran equipo.Quisiera agradecer a la Universitat Politècnica de València la financiación recibida para realizar la tesis. En general, he de agradecer al sistema de educación pública que ha permitido que un hijo de trabajadores como yo haya podido llegar hasta aquí. Además, quiero aprovechar para exigir un sistema de educación público, de calidad, e igualitario, que forme a personas con espíritu crítico y libre; puesto que sólo así se conseguirá que progresemos como sociedad.I would also like to thank to all the people from the group of Chemical Process Engineering of the RWTH Aachen University, especially to Matthias Wessling and Said Abdu, for accepting me in their research group. They have been very kind to me and I have learnt a lot from them and from this fruitful and unforgettable experience in Aachen.También quisiera agradecer a Daniella Buzzi por haberme dejado ser su "chefinho", por tantos momentos buenos y algún que otro momento crítico vividos juntos, porque es bonito saber que tengo una gran amiga al otro lado del charco.Gracias al Grupo IEC, en especial a mis compañeros, con los que he pasado más momentos juntos. Ellos han sido mi familia investigadora. Gracias a Isaac y Carlos, porque han sido para mí un referente, a Jordi y Ramón, porque han estado desde el principio, han sido como mis hermanos, y a Vir y Tepe, ellas han contribuido a que haya un ambiente de trabajo inmejorable! Quiero también dar las gracias al resto de componentes del grupo por su ayuda, en especial a Emma Ortega, a José Luis Guiñón por su ayuda con los equilibrios, y a Anna Igual porque con su energía consigue contagiar su pasión por la investigación.El fruto del trabajo de todos estos años tampoco sería posible sin los momentos vividos junto a mis amigos, el "Kanchy". Ellos son "los de toda la vida", los que siempre han estado, están y estarán ahí. Quisiera hacer mención especial a Lidia por su ayuda con la Tesis, y cómo no, a Sergio, porque juntos hemos arreglado el mundo un millón de veces… ¡para volverlo a destrozar otras tantas! No quiero olvidarme de ninguna de las personas con las que he coincidido y he pasado buenos momentos tanto en Valencia, como en Berlín o en Aachen… Maite, Laura, Guillaume… es imposible nombrarlos a todos… pero quiero agradecer en especial a Tania, porque con ella no existe el tiempo ni la distancia, sé que siempre está ahí a mi lado.Ha arribat el moment d'agrair a les quimixiques els grans moments viscuts. Amb elles hem format una gran família. Em sent molt afortunat d'haver caigut en un grup tan de "puça mare": gràcies a les Silvies, Elena, Gabriel·la, Angeleta, Rosa de Xeraco, Alicia, i en especial a Susana, la meua companya de batalles, i a Ingrid, una gran amiga.Per últim...

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Section: Gravitational Convectionmentioning

confidence: 99%

Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

Martí-Calatayud

García-Gabaldón

Pérez-Herranz

et al. 2011

Journal of Membrane Science

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“…Later different version of the spatial structure of the liquid caused by electroconvection was observed due to electric field applied between the horizontally mounted electrodes (Baranowski and Kawczyński 1972;Baranowski 1980;Ward and Le Blanc 1984;Han and Grier 2005. Recently, studies focus mainly on electroconvection between the horizontally mounted electrodes separated by an ion exchange membrane (Larchet et al 2008;Rubinstein and Zaltzman 2000;Moya and Horno 2004;Nikonenko et al 2010;Serna et al 2014).…”

Section: Theorymentioning

confidence: 99%

“…If these solutions are not mechanically stirred, the concentration boundary layers (CBL) are formed on both sides of artificial and/or biological membranes. The formation of CBL is an important process that occurs in the technical and biological systems (Barry and Diamond 1984;Shachar-Hill and Hill 1993;Larchet et al 2008;Pappenheimer 2001;Grzegorczyn et al 2008;Mishchuk 2010;Nikonenko et al 2010;Grzegorczyn andŚlęzak 2012;Wang et al 2014). These layers change the concentration gradient through the membrane and serve as additional kinetic barriers to the fast permeating substances and, in result, reduce the values of the volume and solute fluxes (Abu-Rjal et al 2014;Barry and Diamond 1984;Ślęzak 1989;Dworecki 1995;Dworecki et al 2003Dworecki et al , 2005Kargol 2000;Ślęzak et al 1985, 2010.…”

Section: Introductionmentioning

confidence: 99%

$$H^{*}$$ H ∗ Peusner’s Form of the Kedem–Katchalsky Equations for Non-homogenous Non-electrolyte Binary Solutions

et al. 2015

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The paper presents a hybrid matrix form of Kedem-Katchalsky equations that contains Peusner's coefficients H * i j (i, j = 1, 2) for the conditions of concentration polarization and H i j for homogeneous solutions. The aqueous glucose solutions were analyzed in Nephrophan membrane system with membrane in horizontal plane. The calculations of coefficients H * i j were made for the A and B configurations of the membrane system. In the A configuration glucose solution with higher concentration was located below and the solution with lower concentration above the membrane. In configuration B locations of the solutions were reversed.

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“…In a real situation, the diffusive layers are built up on both sides of the membrane (Katchalsky and Curran 1965;Barry and Diamond 1984;Śle˛zak 1989;Larchet et al 2008;Mishchuk 2010). Diffusive layers are the cause of lower gradients of thermodynamic forces in the membrane and appearance of substance gradients in diffusive layers at membrane surfaces.…”

Section: The Resistance Coefficients Of a Membrane In Concentration Pmentioning

confidence: 99%

Resistance Coefficients of Polymer Membrane with Concentration Polarization

2012

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The Kedem-Katchalsky equations, modified by means of symmetric transformations of Peusner thermodynamic networks, were applied to interpret the membrane transport in concentration polarization conditions. The results from the study demonstrate that the resistance coefficients counted for membrane transport of aqueous solutions of glucose through Nephrophan membrane in horizontal plane are nonlinearly dependent on mean concentration of glucose in the membrane (C). It was also shown that the threshold value of concentration (C cr ) existed, and forC >C cr , the resistance coefficients depend, while for C C cr ) causes decrease of difference between resistance coefficients of the membrane system in homogeneous conditions (solutions mechanically stirred) and in conditions with hydrodynamic instabilities (configuration B). Besides increase of mean glucose concentration in the membrane (in the rangē C >C cr ) causes increase of the difference between resistance coefficients for membrane system with concentration polarization without hydrodynamic instabilities (configuration A) and membrane system in homogeneous conditions. Keywords

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Application of chronopotentiometry to determine the thickness of diffusion layer adjacent to an ion-exchange membrane under natural convection

Cited by 127 publications

References 34 publications

Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

$$H^{*}$$ H ∗ Peusner’s Form of the Kedem–Katchalsky Equations for Non-homogenous Non-electrolyte Binary Solutions

Resistance Coefficients of Polymer Membrane with Concentration Polarization

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