Swelling behavior of poly(vinyl alcohol) cryogels employed as matrices for cell immobilization

Lozinsky, V. I.; Zubov, A. L.; Titova, E. F.

doi:10.1016/0141-0229(95)00148-4

Cited by 55 publications

(28 citation statements)

References 22 publications

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“…The pH-driven actuation shown in Figure 2c clearly demonstrates the dramatic increase in the speed of response. Bulk PVA hydrogels are insensitive to pH changes in the range used in this study; [22] however, microdimensional fibers prepared by wet spinning showed an observable expansion in pH 9 buffer. While the expansion of microfibers occurred over about 30 min, the nanofibrous hydrogel, in contrast, equilibrated in only 100 s. This result suggests that the diffusion rate of cation-water clusters bound with water molecules is facilitated by the open porous structure of the nanofiber arrays.…”

mentioning

confidence: 97%

Nanocomposite Hydrogel with High Toughness for Bioactuators

et al. 2009

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Ferritin‐based nanofibrous hydrogels that demonstrate synergy between the ferritin protein and the synthetic polymer matrix are fabricated. The hybrid hydrogels showed enhanced mechanical properties and repeated expansion and contraction without showing severe creep during pH switching. The ferritin nanoparticles incorporated into the hydrogel nanofibers improved the actuation stability of a hydrogel actuator by acting as elastic nanosprings in a nanoscale polymer.

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mentioning

confidence: 97%

Nanocomposite Hydrogel with High Toughness for Bioactuators

et al. 2009

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“…The dc and ac conductivities of the BaCl 2 doped PVA films have been increased along with the increase of the doping agent concentration. PVA hydrogels in contact with micro-molecular inorganic salts have also been studied, aiming at elucidating the osmotic properties of the cryogels during a long-lasting exposure to aqueous media, at establishing the gels' behaviour in contact with physiological liquids or at designing electrolyte sensors based on PVA hydrogel materials, which exhibit an intelligent behaviour in the presence of electrolyte solutions [18][19][20][21][22][23][24]. It has been reported that PVA hydrogels collapse when they come into contact with NaCl, KCl, CsCl, Na 3 PO 4 and Na 2 SO 4 solutions; the gel's shrinking depends on the salt nature and concentration.…”

Section: Introductionmentioning

confidence: 99%

Tailoring of poly(vinyl alcohol) cryogels properties by salts addition

Paţachia¹,

Florea²,

Friedrich³

et al. 2009

Express Polym. Lett.

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Abstract. The present paper aims to study the possibility to modify the properties of poly(vinyl alcohol) (PVA) hydrogels prepared in the presence of different salt types (Na2SO4, NaCl and NaNO3) in order to extend the nature of the salts already used in obtaining films or gels, to expand their concentration domains and to explain the increase of film strain, concomitantly with the increase of their crystallinity. The morphology of the PVA based hydrogels has been studied by Scanning Electronic Microscopy (SEM), the interaction between the PVA macromolecular chains and salts has been determined by Fourier Transform Infrared Spectroscopy (FTIR), while the mechanical properties of the cryogels have been investigated by oscillatory dynamic mechanical measurements. The gels swelling in water have been monitored by gravimetric method in order to evidence the alteration of the PVA cryogel properties such as crystallinity and porosity determined by the salt addition to the initial PVA aqueous solution. The data reported show that the ions present in the PVA solution influence the interaction between PVA-water and PVA-PVA chains; their influence on the salt-based PVA hydrogels follow the Hofmeister lyotropic series.

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“…The determination of swelling behaviour of hydrogels in different environments is very important due to their very broad areas of application where hydrogels come in contact with organic or inorganic ionic substances, such as: wound dressing, drugs and protein delivery, artificial tissues, muscles or other organs, separation processes by sorption or diffusion, sensors design etc. [11,12,33,34]. The behaviour of hydrogels with different compositions, in the presence of different ionic substances has been studied [13,18,[23][24][25]32].…”

Section: Introductionmentioning

confidence: 99%

Study of the PVA hydrogel behaviour in 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid

Paţachia¹,

Friedrich²,

Florea³

et al. 2011

Express Polym. Lett.

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Abstract. The present paper aims at studying the behaviour of the poly(vinyl alcohol) [PVA] cryogel in the presence of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM] + [BF 4 ] -) aqueous solutions with various concentrations. The gravimetric method showed that the swollen PVA cryogels exhibit mechanically active behaviour. PVA cryogels showed shrinking in the presence of ionic liquid, (IL), and re-swelling in the presence of distilled water. The re-swelling is not completely reversible, due to the influence of the IL ions on the gel morphology. The Fourier transform infrared (FTIR) spectra have indicated no chemical interaction between the PVA and the studied IL, but highlighted the gel crystallinity change as a function of IL concentration, as well as changes in the bound water amount. Rheological analyses showed dominating plastifying effect of the cation at a lower IL concentration and dominating kosmotropic effect of the anion at a higher IL concentration. A phenomenological kinetic equation that takes into account both fluxes of matters, in and out of the gel, is proposed, explaining the alteration of the gel properties when it comes in contact with BMIMBF 4 solutions.

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Swelling behavior of poly(vinyl alcohol) cryogels employed as matrices for cell immobilization

Cited by 55 publications

References 22 publications

Nanocomposite Hydrogel with High Toughness for Bioactuators

Nanocomposite Hydrogel with High Toughness for Bioactuators

Tailoring of poly(vinyl alcohol) cryogels properties by salts addition

Study of the PVA hydrogel behaviour in 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid

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