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The stimuli-response characters of hydrogels prepared using ultrasound

  • Rajabali Ebrahimi EMAIL logo and Mahnoush Ebrahimi
Published/Copyright: June 6, 2014
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Abstract

The present work was an attempt to investigate the parameters that can affect the process of hydrogel formation in the presence of ultrasound. These parameters were concentrations of the reactants, the reaction medium, and acoustic factors. The monomers were acrylic acid and acrylamide, and the cross-linker was methylene bis acrylamide. Pulsed power ultrasound was irradiated to the reaction mixture from the tip of a probe unit. The swelling behaviors of the obtained hydrogels were investigated in various buffer solutions, at different temperature values, and using different ionic salts. The results show that ultrasonic irradiation significantly reduces reaction time and increases efficiency. Additionally, increasing glycerol in the solution changes the viscosity of the reaction for the better and increases the reaction rate. However, ionic strength and pH were not significantly effective in this respect. Another major finding was that increasing ultrasonic power and pulse hastens the reaction. Cationic salts were effective in this order: Na+>Ca2+>Fe3+. The hydrogel was responsive to pH, temperature, and salts. These findings provide a better understanding of hydrogel synthesis and enable us to control the pertinent parameters.


Corresponding author: Rajabali Ebrahimi, Department of Chemistry, College of Science, Takestan Branch, Islamic Azad University, Takestan, Iran, e-mail:

Acknowledgments

Dr R. Ebrahimi acknowledges to the Islamic Azad University of Takestan (Iran) for providing the financial support.

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Received: 2014-2-5
Accepted: 2014-5-6
Published Online: 2014-6-6
Published in Print: 2014-9-1

©2014 by De Gruyter

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