Aging and Thermodynamics of Polyacrylamide Gels

Janas, Victor F.; Rodriguez, Ferdinand; Cohen, Claude

doi:10.1021/ma60076a042

Cited by 83 publications

(40 citation statements)

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“…For such loosely crosslinked gels, one may expect that both the dense and dilute regions of gel will swell significantly during the swelling process, which may decrease the extent of concentration fluctuations. To check this point, we used a simple two-phase gel model proposed by Weiss and Silberberg, and by Cohen et al [36][37][38]. According to this model, the gel consists of two phases; one phase containing a high concentration of polymer and crosslinks; the other containing a low concentration of polymer and crosslinks.…”

Section: Effect Of Segment Densitymentioning

confidence: 99%

“…According to this model, the gel consists of two phases; one phase containing a high concentration of polymer and crosslinks; the other containing a low concentration of polymer and crosslinks. The model assumes that the two phases are weakly bound each other such that they swell independently [38]. The swelling equilibrium in each phase is given by the FloryRehner swelling theory.…”

Section: Effect Of Segment Densitymentioning

confidence: 99%

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Spatial inhomogeneity in poly(acrylic acid) hydrogels

Yazıcı

Okay

2005

Polymer

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Section: Effect Of Segment Densitymentioning

confidence: 99%

Section: Effect Of Segment Densitymentioning

confidence: 99%

Spatial inhomogeneity in poly(acrylic acid) hydrogels

Yazıcı

Okay

2005

Polymer

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“…As has been shown experimentally [9][10][11][12][13] and theoretically, [13,14] acrylamide (AAm)-based hydrogels exhibit inhomogeneous cross-linking distributions. Highly intramolecular cross-linked ''blob clusters'' are formed in the pregel period due to the high extent of cyclization acting as junction points.…”

Section: Introductionmentioning

confidence: 91%

Estimation of the Generation and the Weight Fraction of Dense Polymer Regions in Heterogeneous Hydrogels

Alveroğlu

2011

Macro Chemistry & Physics

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The internal structure of polyacrylamide gels consists of polymer‐dense regions with different densities, which are denoted as “blobs”. The density difference between these blobs decreases when a gel is doped with charged molecules. When a small potential is applied between the ends of such a gel, ionic charge carriers result in a current. A theoretical approach is developed to estimate the weight fraction and the number of blob generation. The current decreases with time as a series of exponentially decreasing terms where the exponent and the multiplier of each term measure the density of the blob and the weight fraction of the corresponding blob generation. magnified image

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“…For instance, n cr /V m ϭ 1.46 ϫ 10 Ϫ3 M and ϭ 0.49 for polyacrylamide. 55 Equation A16 can be written as…”

Section: The Side View Swelled Hydrogel Area Ismentioning

confidence: 99%

Experimental and Theoretical Aspects of Glucose Measurement Using a Microcantilever Modified by Enzyme-Containing Polyacrylamide

Yan

McShane

2005

Diabetes Technology & Therapeutics

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We report a glucose oxidase-containing polyacrylamide hydrogel-coated microcantilever sensor for the measurement of glucose. This enzymatic reaction of glucose results in swelling of the hydrogel due to formation of charged ions (gluconate molecules and protons). The microcantilever undergoes reversible and reproducible bending deflection upon exposure to solutions containing various glucose concentrations due to swelling or shrinking of the hydrogels. The microcantilever deflections increase when the glucose concentrations increase. A theoretical model has been built to correlate volume changes of the gel with microcantilever bending. The calculated data matched with the experimental results very well. Such hydrogel-coated microcantilevers could potentially be used to prepare microcantilever-based chemical and biological sensors when other enzymes are immobilized in the hydrogel.

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Aging and Thermodynamics of Polyacrylamide Gels

Cited by 83 publications

References 0 publications

Spatial inhomogeneity in poly(acrylic acid) hydrogels

Spatial inhomogeneity in poly(acrylic acid) hydrogels

Estimation of the Generation and the Weight Fraction of Dense Polymer Regions in Heterogeneous Hydrogels

Experimental and Theoretical Aspects of Glucose Measurement Using a Microcantilever Modified by Enzyme-Containing Polyacrylamide

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