pH‐induced swelling kinetics of polyelectrolyte hydrogels

Chu, Yao Yao; Varanasi, Padma Prabodh; McGlade, M. J.; Varanasi, Sasidhar

doi:10.1002/app.1995.070581203

Cited by 72 publications

(45 citation statements)

References 18 publications

(3 reference statements)

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“…For a better understanding we considered acidic medium, in which the conjugate base of the buffer reversibly binds hydrogen ions in regions of higher concentration and releases the hydrogen ion after diffusing to a region of lower concentration. 30 Equilibrium of hydrogel occurs when the elastic restoring force of the network balances the osmotic forces and swelling index becomes constant. [30][31][32] 3…”

Section: Ph-responsive and Dielectric Cnc Hydrogelmentioning

confidence: 99%

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Designing pH-responsive and dielectric hydrogels from cellulose nanocrystals

et al. 2015

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We report the fabrication and characterization of a pH-responsive hydrogel with improved mechanical and dielectric properties from cellulose nanocrystals. X-ray diffraction and SEM observations were used to analyze the sample morphology. The resulting pH detector exhibits a pronounced change in their swelling index in response to variation in pH. It was used singly and in combination with other nanomaterials to optimize smart material designs. The applications of the developed material are anticipated in chemical, environmental and biological systems.

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Section: Ph-responsive and Dielectric Cnc Hydrogelmentioning

confidence: 99%

“…30 Equilibrium of hydrogel occurs when the elastic restoring force of the network balances the osmotic forces and swelling index becomes constant. [30][31][32] 3…”

Section: Ph-responsive and Dielectric Cnc Hydrogelmentioning

confidence: 99%

Designing pH-responsive and dielectric hydrogels from cellulose nanocrystals

et al. 2015

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“…. term _ c k ¼ @c k =@t of diffusive ion concentrations in Equation (2) vanishes and thus the diffusivity constant D k is eliminated. In the experiments, the material studied is an interpenetrating polymer networks (IPNs) hydrogel composed of poly(methacrylic acid) (PMAA) and poly(vinyl alcohol) (PVA).…”

Section: Comparisons Of the Mecph Model With Experimental Datamentioning

confidence: 99%

“…The ionized hydrogels are able to undergo reversible volume change responding to the surrounding environmental variation, for example, solution pH, temperature, electric field, solvent composition, salt concentration or light, etc. [1][2][3][4][5][6][7][8][9] The unique capability coupled with good biocompatibility and designable characteristics enable the hydrogels to be next generation smart functional materials for wide ranges of bioengineering applications, especially in biomicroelectromechanical systems…”

Section: Introductionmentioning

confidence: 99%

Meshless Modeling of pH‐Sensitive Hydrogels Subjected to Coupled pH and Electric Field Stimuli: Young Modulus Effects and Case Studies

Yew

et al. 2007

Macro Chemistry & Physics

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The effect of Young's modulus on the behavior of pH‐sensitive hydrogels is studied when subjected to coupled stimuli of solution pH and externally applied electric field. The study is the first instance for coupled stimuli numerical analysis of the hydrogels, in which a multieffect‐coupling pH‐stimulus (MECpH) model is presented. The model considers ionic diffusion, electric potential, and large mechanical deformation. A correlation between diffusive hydrogen ion and charge groups fixed onto the hydrogel polymeric chains by the Langmuir absorption isotherm is incorporated into the model. To validate the model, the computed results by the meshless Hermite‐Cloud technique are compared well with experimental data available from the literature. Then several case studies are conducted for the swelling hydrogel immersed in buffered solution subject to applied electric voltage, especially for the Young modulus effects on the volume variations of the hydrogels.magnified image

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“…These charged groups produce an electrostatic repulsion force among themselves, which influences the expansion of a gel network. 17 For example, in the case of anionic polymeric networks containing carboxylic or sulphonic acid groups, ionization occurs as the pH of the external swelling medium rises above the pKa of that ionizable moiety. The polymeric network becomes more hydrophilic as the degree of ionization increases.…”

Section: Introductionmentioning

confidence: 99%

pH-thermoreversible hydrogels. I. Synthesis and swelling behaviors of the (N-isopropylacrylamide-co-acrylamide-co-2-hydroxyethyl methacrylate) copolymeric hydrogels

Lee

Shieh

1999

J. Appl. Polym. Sci.

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A series of pH-thermoreversible hydrogels that exhibited volume phase transition was synthesized by various molar ratios of N-isopropylacrylamide (NIPAAm), acrylamide (AAm), and 2-hydroxyethyl methacrylate (HEMA). The influence of environmental conditions such as temperature and pH value on the swelling behavior of these copolymeric gels was investigated. Results showed that the hydrogels exhibited different equilibrium swelling ratios in different pH solutions. Amide groups could be hydrolyzed to form negatively charged carboxylate ion groups in their hydrophilic polymeric network in response to an external pH variation. The pH sensitivities of these gels also depended on the AAm content in the copolymeric gels; thus the greater the AAm content, the higher the pH sensitivity. These hydrogels, based on a temperature-sensitive hydrogel, demonstrated a significant change of equilibrium swelling in aqueous media between a highly solvated, swollen gel state and a dehydrated network response to small variations of temperature. pH-thermoreversible hydrogels were used for a study of the release of a model drug, caffeine, with changes in temperature.

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pH‐induced swelling kinetics of polyelectrolyte hydrogels

Cited by 72 publications

References 18 publications

Designing pH-responsive and dielectric hydrogels from cellulose nanocrystals

Designing pH-responsive and dielectric hydrogels from cellulose nanocrystals

Meshless Modeling of pH‐Sensitive Hydrogels Subjected to Coupled pH and Electric Field Stimuli: Young Modulus Effects and Case Studies

pH-thermoreversible hydrogels. I. Synthesis and swelling behaviors of the (N-isopropylacrylamide-co-acrylamide-co-2-hydroxyethyl methacrylate) copolymeric hydrogels

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