Polyelectrolyte and antipolyelectrolyte effects in swelling of polyampholyte and polyzwitterionic charge balanced and charge offset hydrogels

Gao, Ming; Gawel, Kamila; Stokke, Bjørn Torger

doi:10.1016/j.eurpolymj.2014.01.014

Cited by 50 publications

(41 citation statements)

References 38 publications

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“…In the present work, we employ an interferometric technique for determination of swelling changes in the hydrogels at the end of the fibers. This technique offers a resolution of about 2 nm for hemispherical hydrogels [ 39 ], and have been employed for quantitative characterization of swelling of e.g., anionic hydrogels [ 39 ], glucose sensing hydrogels [ 4 , 15 ], hybrid DNA-acrylamide hydrogels [ 10 , 40 , 41 ] or zwitterionic hydrogels [ 42 ]. The swelling response in these cases has been stimulated by exposing the hydrogels to salts, and specific and unspecific analytes.…”

Section: Resultsmentioning

confidence: 99%

Donnan Contribution and Specific Ion Effects in Swelling of Cationic Hydrogels are Additive: Combined High-Resolution Experiments and Finite Element Modeling

Žuržul

Ilseng

Prot

et al. 2020

Gels

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Finite element modeling applied to analyze experimentally determined hydrogel swelling data provides quantitative description of the hydrogel in the aqueous solutions with well-defined ionic content and environmental parameters. In the present study, we expand this strategy to analysis of swelling of hydrogels over an extended concentration of salt where the Donnan contribution and specific ion effects are dominating at different regimes. Dynamics and equilibrium swelling were determined for acrylamide and cationic acrylamide-based hydrogels by high-resolution interferometry technique for step-wise increase in NaCl and NaBr concentration up to 2 M. Although increased hydrogel swelling volume with increasing salt concentration was the dominant trend for the uncharged hydrogel, the weakly charged cationic hydrogel was observed to shrink for increasing salt concentration up to 0.1 M, followed by swelling at higher salt concentrations. The initial shrinking is due to the ionic equilibration accounted for by a Donnan term. Comparison of the swelling responses at high NaCl and NaBr concentrations between the uncharged and the cationic hydrogel showed similar specific ion effects. This indicates that the ion non-specific Donnan contribution and specific ion effects are additive in the case where they are occurring in well separated ranges of salt concentration. We develop a novel finite element model including both these mechanisms to account for the observed swelling in aqueous salt solution. In particular, a salt-specific, concentration-dependent Flory–Huggins parameter was introduced for the specific ion effects. This is the first report on finite element modeling of hydrogels including specific ionic effects and underpins improvement of the mechanistic insight of hydrogel swelling that can be used to predict its response to environmental change.

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Section: Resultsmentioning

confidence: 99%

Donnan Contribution and Specific Ion Effects in Swelling of Cationic Hydrogels are Additive: Combined High-Resolution Experiments and Finite Element Modeling

Žuržul

Ilseng

Prot

et al. 2020

Gels

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“…DMSA chitosan beads showed to be good adsorbent because their swelling percentage is low. The pH of the solution, ionic strength and material of functionalization are swelling factors known to affect the efficiency of the adsorbents [80][81][82][83]. Figure 1 shows the SEM micrographs at 1500x dimensions of PCF (Fig.…”

Section: Adsorbent Characterization Solubility and Swelling Testmentioning

confidence: 98%

Adsorption of arsenic(V) oxyanion from aqueous solutions by using protonated chitosan flakes

Padilla-Rodríguez

Hernández-Viezcas

Peralta-Videa

et al. 2015

Separation Science and Technology

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Arsenate (As(V)) oxyanion removal was achieved utilizing diverse chitosancontaining adsorbents, such as chitosan beads, protonated chitosan flakes, chitosan powder and chitosan functionalized with meso-2,3-dimercapto succinic acid (DMSA), and glutaraldehyde (GLA). Protonated Chitosan Flakes (PCF) showed to be the more effective adsorbent for the removal of As(V) oxyanion from aqueous solutions, removing 97% at the initial concentration of 0.500 mg/L. As(V) adsorption was favored by Langmuir model, with a maximum adsorption capacity (Q 0 ) of 5.43 mg/g. The results showed that the PCF is an excellent non-toxic and inexpensive adsorbent for As(V) oxyanion removal in level traces from aqueous solution.

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“…Such anti‐polyelectrolyte effect has been observed in various zwitterionic polymers systems. [ 43,44 ] Consequently, the PSBMA brush layer can further swell, leading to a thicker hydrated polymer layer and larger OCA in water.…”

Section: Figurementioning

confidence: 99%

Zwitterionic Polymer‐Grafted Superhydrophilic and Superoleophobic Silk Fabrics for Anti‐Oil Applications

Cheng

Wang

et al. 2020

Macromol. Rapid Commun.

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A highly anti‐oil fabric membrane is synthesized by surface grafting of zwitterionic poly(sulfobetaine methacrylate) (PSBMA) onto the fabric surface. The fabric membrane is first enzymatically modified to create more reactive amine groups on the surface. A surface‐initiated atom transfer radical polymerization (SI‐ATRP) reaction is then performed to modify the fabric membrane surface with a dense PSBMA brush layer. Surface characterization indicates that the brush‐grafted fabric membrane exhibits increased surface roughness and improved superhydrophilicity. The PSBMA‐modified silk fabrics show a very large contact angle for oil droplets in water, and have excellent oil resistance in air and in water–oil mixtures.

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Polyelectrolyte and antipolyelectrolyte effects in swelling of polyampholyte and polyzwitterionic charge balanced and charge offset hydrogels

Cited by 50 publications

References 38 publications

Donnan Contribution and Specific Ion Effects in Swelling of Cationic Hydrogels are Additive: Combined High-Resolution Experiments and Finite Element Modeling

Donnan Contribution and Specific Ion Effects in Swelling of Cationic Hydrogels are Additive: Combined High-Resolution Experiments and Finite Element Modeling

Adsorption of arsenic(V) oxyanion from aqueous solutions by using protonated chitosan flakes

Zwitterionic Polymer‐Grafted Superhydrophilic and Superoleophobic Silk Fabrics for Anti‐Oil Applications

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