Transport of non-associated electrolytes in acrylamide hydrogels

Lobo, Victor M.M.; Valente, Artur J.M.; Polishchuk, A. Ya.; Geuskens, Georges

doi:10.1016/s0167-7322(01)00267-7

Cited by 27 publications

(26 citation statements)

References 27 publications

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“…With this model, another question arises: What kind of bond exists between SDS unimers and the polar sites of the polyacrylamide structure, which are then responsible for the Langmuir-type sorption? In a previous study [19] we have found that water has an important influence in the whole process of transport of non-associated electrolytes in these gels. Water shows a variety of different structures in these gels [20].…”

Section: Sorption Isothermsmentioning

confidence: 82%

Diffusion coefficients of sodium dodecyl sulfate in water swollen cross-linked polyacrylamide membranes

Valente

Miguel

Lobo

2002

European Polymer Journal

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Diffusion of aqueous sodium dodecyl sulfate (SDS) across cross-linked polyacrylamide hydrogel membranes has been studied by electrical conductivity measurements. Initial rapid sorption of SDS (as unimer) into the membranes is observed. The effect of SDS concentration, and of cross-linker fraction on the degree of swelling of the gels is studied and associated with binding of the surfactant to the polymer, with surface bound water suggested to be involved in these interactions. Below the surfactant critical micelle concentration, volume collapse of less cross-linked membranes is observed, and associated with aggregate formation. Fluorescence measurements using pyrene as a probe show that micellar aggregates do not diffuse through the membrane, and only overall unimer diffusion is observed. The effect of cross-linking on the diffusion process is discussed.

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Section: Sorption Isothermsmentioning

confidence: 82%

Diffusion coefficients of sodium dodecyl sulfate in water swollen cross-linked polyacrylamide membranes

Valente

Miguel

Lobo

2002

European Polymer Journal

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“…Calix [4] Pre-gel homogeneous aqueous solutions of AAm (2.5 M), with 5% (mol/mol) of MBAAm and 1% of initiator were prepared. The hydrogel membranes were prepared by free radical polymerisation of the pre-gel solution [18] inside two glass sheets separated by plastic rubber gasket. Spring clips were used to hold the glass sheets together.…”

Section: Synthesis Of Meso-octamethyl-porphyrinogen (1)mentioning

confidence: 99%

Effect of different electrolytes on the swelling properties of calyx[4]pyrrole-containing polyacrylamide membranes

Valente

Sobral

Jiménez

et al. 2006

European Polymer Journal

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Calix[4]pyrrole (1) was synthesized and characterized and this macrocycle was incorporated in polyacrylamide gels. The presence of meso-octamethyl-porphyrinogen inside of gel was checked using infrared spectroscopy, differential scanning calorimetry, and swelling studies. The swelling degree of these hydrogels in equilibrium with different electrolytes (NaCl, LiCl, KCl, CaCl 2 and AlCl 3 ) was measured in a concentration range 0.1-0.5 mol dm À3 . Although no significant alterations in the swelling degree can be found for the different 1:1 electrolytes, when the cation charge of unsymmetrical electrolytes increases, the gel swells in a significant way. This swelling process is enhanced by the presence of calyx [4]pyrrole. The effect of alkaline hydrolysis of polaycrylamide-based hydrogels was also studied. The hydrolysed hydrogels collapse in the presence of the electrolytes; this behavior is dependent on the hydrolysis degree, electrolyte charge and calyx[4]pyrrole presence and concentration; the latter leads to polyacrylamide with tailor-made properties.

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“…On the other hand, hydrogels are crosslinked, hydrophilic polymer networks, which can swell in water and polyacrylamide hydrogels have been widely studied in the literature [21][22][23][24][25][26]. This water sorption ability of hydrogels is an important characteristic of these materials and accounts for many of their applications in areas such as chemistry, pharmacy, agriculture or biotechnology [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Correlation between solution and gel properties of copolymers of acrylamide and diallyldimethylammonium chloride

2010

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Several copolymers formed by acrylamide and diallyldimethyl ammonium chloride containing different fractions of charged diallyl residues, x, were synthesized. Solution properties of linear samples of these copolymers were studied by size exclusion chromatography coupled to differential refractive index and light scattering detectors, which allowed the determination of molecular weight averages, molecular dimensions, scaling law coefficients, and unperturbed dimensions. The results were compared with those of the corresponding homopolymers i.e., polyacrylamide and poly(diallyldimethylammonium chloride). On the other hand, crosslinked samples of the copolymers were prepared and their swelling in water was studied. The correlation between the solution properties of the linear samples and the swelling behaviour of their crosslinked counterparts can be illustrated through the relationship between the characteristic ratio of the unperturbed dimensions and the equilibrium degree of swelling since both magnitudes exhibit a similar dependence on x. Moreover, this dependence is not linear and it passes through a maximum at ca. x ≈ 0.5.

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Transport of non-associated electrolytes in acrylamide hydrogels

Cited by 27 publications

References 27 publications

Diffusion coefficients of sodium dodecyl sulfate in water swollen cross-linked polyacrylamide membranes

Diffusion coefficients of sodium dodecyl sulfate in water swollen cross-linked polyacrylamide membranes

Effect of different electrolytes on the swelling properties of calyx[4]pyrrole-containing polyacrylamide membranes

Correlation between solution and gel properties of copolymers of acrylamide and diallyldimethylammonium chloride

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