Mohsen, Reham, Vine, George J., Majcen, Natasa, Alexander, Bruce D, and Snowden, Martin J. ORCID: https://orcid.org/0000-0002-1087-2692 (2013) Characterization of thermo and pH responsive NIPAM based microgels and their membrane blocking potential. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 428. pp. 53-59. ISSN 0927-7757 (doi:10.1016/j.colsurfa.2013.03.031)

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Abstract

This work aims to study the behavior of temperature-responsive p(NIPAM) and temperature/pH-responsive p(NIPAM)/acrylic acid (AA) microgels. Three microgels were synthesized using surfactant freeemulsion polymerization technique, these are p(NIPAM), p(NIPAM)-co-AA 95:5% (w/w) and p(NIPAM)-co-AA 90:10% (w/w). Dynamic light scattering was used to study the behavior of diluted microgeldispersions (0.5%, w/w p(NIPAM)), while rheology was used to study the viscosity of 2% (w/w) p(NIPAM)dispersions. The characterization data indicate the swelling/deswelling and flocculation/deflocculationbehavior of the microgels. The conditions required for flocculation were used to test the ability of themicrogel dispersions to block a membrane of pore size 5 �m. In 3 h, p(NIPAM), p(NIPAM) 5% AA (w/w)and p(NIPAM)10% AA (w/w) blocked the membrane (decrease the flow rate) by 96.16, 59.44 and 59.8%respectively. Thus, the controlled flocculation of microgels may be used in applications where pore block-ing is important such as the treatment of dentinal hypersensitivity, given that the VPTT of p(NIPAM) is≈34◦C, which is very close to the human body temperature.

Item Type:	Article
Uncontrolled Keywords:	colloids, p(NIPAM), acrylic acid, DLS, rheology, particle concentration, membrane blockage
Subjects:	Q Science > QD Chemistry
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science > School of Science (SCI)
Related URLs:	Publisher
Last Modified:	16 Apr 2020 13:26
URI:	http://gala.gre.ac.uk/id/eprint/9875

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