Controlling the collapse/swelling transition in charged hydrogels

Ostroha, Jamie; Pong, Mona; Lowman, Anthony M.; Dan, Nily

doi:10.1016/j.biomaterials.2003.11.019

Cited by 70 publications

(56 citation statements)

References 30 publications

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“…Effect of Temperature P(NIPAMco-MAA) Microgel Series: DLS measurements were used to judge the hydrodynamic radius in the temperature range of 20-70 o C of the polymer microgels at pH (3)(4)(5)(6)(7)(8)(9)(10)(11)(12). Hydrodynamic radius of the polymer microgel particles is dependent upon temperature.…”

Section: Resultsmentioning

confidence: 99%

“…A zeta plus zetameter (Brookhaven Instrument Corp., NJ) was used for the measurements of zeta potential. Polymer microgels surface charge density was determined from the electrophoretic mobility measurements at a temperature (20-55 o C) and pH (3)(4)(5)(6)(7)(8)(9)(10). The measurements were carried out as a function of pH (3)(4)(5)(6)(7)(8)(9)(10) at 25 o C. The measurements were performed in a background electrolyte concentration of 1×10 -3 mol dm -3 NaCl (In order to remove variability and to keep constant the length of electrical double layer, background electrolyte is used) solution.…”

Section: Methodsmentioning

confidence: 99%

“…10 The excellent swelling behavior makes them extremely important carriers for drug controlled release. This type of hydrogels can be used as a temperature and pHresponsive drug deliverers.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Characterization of Novel Temperature and pH Sensitive (NIPAM-co-MAA) Polymer Microgels and Their Volume Phase Change with Various Salts

Khan¹,

Khan²,

Khan³

et al. 2013

Polymer Korea

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Novel microgels of N-isopropylacrylamide (NIPAM)-co-methacrylic acid (MAA) (NIPAM-co-MAA) with different contents of N,N-methylene bis acrylamide (MBA) were prepared by emulsion polymerization technique and were studied by Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS) and zeta potential measurement. Effect of pH, temperature and different salts concentration on the microgel particles was investigated. DLS results have shown that the hydrodynamic radius of the microgel increased upon increasing pH and decreased upon increasing temperature. The swelling/deswelling behaviors as determined by DLS showed the ionic repulsions of the carboxyl group of the methacrylic acid and hydrophobic interaction of NIPAM. The effect of various salts on volume phase transition temperature (VPTT) was also investigated. Upon increasing salt concentration, VPTT became broad and shifted to a lower temperature. Electrophoretic mobility measurements showed an increase with increasing pH and temperature at a constant ionic strength.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Preparation and Characterization of Novel Temperature and pH Sensitive (NIPAM-co-MAA) Polymer Microgels and Their Volume Phase Change with Various Salts

Khan¹,

Khan²,

Khan³

et al. 2013

Polymer Korea

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“…The swelling ratios of the hydrogels declined sharply compared to the use of deionized water. In fact, this observation is common in the swelling experiments of polyelectrolyte hydrogels (Ostroha et al 2004;Saunders et al 2008). This may have been explained as follows: the charge screening effect caused by the counter ions (Na+) in the salt solution could clearly weaken the electrostatic repulsion and thereby decrease the osmotic pressure between the hydrogel networks and the external solution.…”

Section: Effect Of Ph and Salt Solution On Water Absorbencymentioning

confidence: 74%

Rice Husk Char/Poly-(Acrylic Acid-co-acrylamide) Superabsorbent Hydrogels: Preparation, Characterization, and Swelling Behaviors

2017

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A series of novel rice husk char/poly-(acrylic acid(AA)-co-acrylamide(AM)) superabsorbent hydrogels were synthesized by graft copolymerization. The effects of the rice husk char (RHC) loading on their miscibility, shapes, and chemical structures were studied, and their swelling behaviors, kinetics, and pH response were evaluated. During the preparation, RHC reacted with acrylic acid. The RHC at lower loads (< mass ratios of RHC and AA of 1%) was scattered well within the polymer matrix, but an excessive load might result in the formation of large agglomerates. The swelling capacity and swelling rate of the hydrogels first were both increased with the rising RHC loading to 1% and then declined with further RHC loading. The superabsorbent hydrogel containing 1% RHC had the highest water absorbency (869 g/g in deionized water and 97 g/g in 0.9% NaCl solution).

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“…(38) to (42) are applied over the hydrogel boundaries, and the final system of equations is solved for the displacements u and v at the hydrogel field nodes. Even if an external mechanical stress or electric field is applied on the hydrogel, it is effectively handled by the RDQ method.…”

Section: The Model Of 2d Ph-sensitive Hydrogelmentioning

confidence: 99%

2D simulation of the deformation of pH-sensitive hydrogel by novel strong-form meshless random differential quadrature method

Mulay

2011

Comput Mech

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The objective of presented work is to simulate the response of 2D hydrogel when subjected to the varying pH of buffer solution and initial fixed-charge concentration inside the hydrogel. The novelty of the work is that this is the first attempt to perform the 2D simulation of pHresponsive hydrogel by novel strong-form meshless method, such as random differential quadrature (RDQ) method. The analytical equations, derived for the hydrogel deformation in the x and y directions, are numerically verified by the square shaped hydrogel disc. The jumps in the distributions of ionic concentrations and electrical potential, across the interface between solution and hydrogel, are effectively captured by the RDQ method. A novel approach is proposed to correctly impose natural boundary conditions for non-uniform boundary. The effects of solution pH and initial fixed-charge concentration on the hydrogel swelling are also successfully investigated.Keywords Random differential quadrature methods · 2D simulation of hydrogel · Meshless method · Differential quadrature method

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Controlling the collapse/swelling transition in charged hydrogels

Cited by 70 publications

References 30 publications

Preparation and Characterization of Novel Temperature and pH Sensitive (NIPAM-co-MAA) Polymer Microgels and Their Volume Phase Change with Various Salts

Preparation and Characterization of Novel Temperature and pH Sensitive (NIPAM-co-MAA) Polymer Microgels and Their Volume Phase Change with Various Salts

Rice Husk Char/Poly-(Acrylic Acid-co-acrylamide) Superabsorbent Hydrogels: Preparation, Characterization, and Swelling Behaviors

2D simulation of the deformation of pH-sensitive hydrogel by novel strong-form meshless random differential quadrature method

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