Swelling Kinetics of a Polyelectrolyte Gel in Water and Salt Solutions. Coexistence of Swollen and Collapsed Phases

1998 ◽  
Vol 31 (25) ◽  
pp. 8845-8850 ◽  
Author(s):  
Tatiana Budtova ◽  
Patrick Navard
Keyword(s):  
Swelling Kinetics ◽  
Salt Solutions ◽  
Polyelectrolyte Gel ◽  
Kinetics Of

scholarly journals Swelling Studies of Porous and Nonporous Semi-IPN Hydrogels for Sensor and Actuator Applications

Micromachines ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 425
Author(s):  
Daniela Franke ◽  
Gerald Gerlach
Keyword(s):  
Abrupt Change ◽  
Swelling Behavior ◽  
Template Method ◽  
Swelling Kinetics ◽  
Interpenetrating Network ◽  
Salt Solutions ◽  
Theoretical Assumptions ◽  
Different Temperatures ◽  
Swelling Studies ◽  
Kinetics Of

In this article, we present a semi-interpenetrating network (IPN) hydrogel of reasonable size with improved swelling behavior. The semi-IPN is composed of N-isopropylacrylamide and 2-acrylamido-2-methyl-1-propanesulfonic acid. Porosity was generated chemically by a surfactant-based template method. The swelling behavior was measured after an abrupt change of the temperature to 25 °C or 40 °C or after an abrupt change of the salt concentration of the aqueous medium surrounding the hydrogel samples. A set of static swelling degrees was determined from swelling measurements in salt solutions of varying concentrations and at different temperatures. Introducing porosity to the semi-IPN decreases the swelling times for most measurements while the sensor and actuator characteristics of the hydrogel found in previous studies are preserved. Additionally, we propose theoretical assumptions and explanations regarding the differences in the swelling kinetics of the porous and the nonporous semi-IPN and deduce implications for sensor and actuator applications.

scholarly journals Polyelectrolyte Gels: A Unique Class of Soft Materials

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 102
Author(s):  
Ferenc Horkay
Keyword(s):  
Exchange Process ◽  
Interaction Strength ◽  
Soft Materials ◽  
Industrial Applications ◽  
Future Research ◽  
Swelling Kinetics ◽  
Polyelectrolyte Gels ◽  
Ion Exchange Process ◽  
Counter Ions ◽  
Kinetics Of

The objective of this article is to introduce the readers to the field of polyelectrolyte gels. These materials are common in living systems and have great importance in many biomedical and industrial applications. In the first part of this paper, we briefly review some characteristic properties of polymer gels with an emphasis on the unique features of this type of soft material. Unsolved problems and possible future research directions are highlighted. In the second part, we focus on the typical behavior of polyelectrolyte gels. Many biological materials (e.g., tissues) are charged (mainly anionic) polyelectrolyte gels. Examples are shown to illustrate the effect of counter-ions on the osmotic swelling behavior and the kinetics of the swelling of model polyelectrolyte gels. These systems exhibit a volume transition as the concentration of higher valence counter-ions is gradually increased in the equilibrium bath. A hierarchy is established in the interaction strength between the cations and charged polymer molecules according to the chemical group to which the ions belong. The swelling kinetics of sodium polyacrylate hydrogels is investigated in NaCl solutions and in solutions containing both NaCl and CaCl2. In the presence of higher valence counter-ions, the swelling/shrinking behavior of these gels is governed by the diffusion of free ions in the swollen network, the ion exchange process and the coexistence of swollen and collapsed states.

Curing and swelling kinetics of new magnetorheological elastomer based on natural rubber/waste natural rubber gloves composites

2018 ◽  
Vol 51 (7-8) ◽  
pp. 583-602
Author(s):  
Nabil Hayeemasae ◽  
Hanafi Ismail
Keyword(s):  
Natural Rubber ◽  
Material Properties ◽  
Swelling Kinetics ◽  
Curing Process ◽  
Magnetorheological Elastomer ◽  
Rubber Composites ◽  
Rubber Waste ◽  
New Type ◽  
Kinetics Of ◽  
Single Filler

This article proposes a new type of magnetorheological elastomer (MRE) based on natural rubber (NR) and waste natural rubber gloves (wNRg) blends. The material properties of the MRE samples were investigated with specific focus on the curing and swelling kinetics. Two different series were prepared; the first used carbonyl iron (CI) as the single filler in the MRE, whereas the second hybridized CI with carbon black (CB) to prepare an MRE resistant to solvents. The results show that most properties depend strongly on the nature of both fillers. The higher thermal conductivity of the CI caused a substantial decrease in both the scorch and curing times and the activation energy in the curing process. Based on the diffusion study, a higher volume of fillers in the rubber composites resulted in a greater area of blockage and restricted the penetration of the solvent tested throughout the composites, irrespective of whether CI alone or in combination with CB was used in the composites.

Effect of Elastocapillarity on the Swelling Kinetics of Hydrogels

2021 ◽  
Author(s):  
Ida Ang ◽  
Zezhou Liu ◽  
Chung Yuen Hui ◽  
Nikolaos Bouklas
Keyword(s):  
Swelling Kinetics ◽  
Kinetics Of

In-vitro-digestion and swelling kinetics of whey protein, egg white protein and sodium caseinate aerogels

2020 ◽  
Vol 101 ◽  
pp. 105534 ◽  
Author(s):  
Christian Kleemann ◽  
Raffael Schuster ◽  
Elisabeth Rosenecker ◽  
Ilka Selmer ◽  
Irina Smirnova ◽  
...  
Keyword(s):  
Whey Protein ◽  
Sodium Caseinate ◽  
In Vitro Digestion ◽  
Egg White ◽  
Swelling Kinetics ◽  
Egg White Protein ◽  
Kinetics Of

Kinetics of CO2Absorption in Aqueous Sarcosine Salt Solutions: Influence of Concentration, Temperature, and CO2Loading

2010 ◽  
Vol 49 (20) ◽  
pp. 9693-9702 ◽  
Author(s):  
Katja Simons ◽  
Wim (D.W.F.) Brilman ◽  
Harro Mengers ◽  
Kitty Nijmeijer ◽  
Matthias Wessling
Keyword(s):  
Salt Solutions ◽  
Kinetics Of
Sign in / Sign up

Export Citation Format

Share Document