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- Title
Magnet–PNIPA hydrogels for bioengineering applications.
- Authors
Ramanujan, R.; Ang, K.; Venkatraman, S.
- Abstract
Temperature-sensitive Poly ( N-isopropylacrylamide), PNIPA gels were synthesized with micron-sized iron and iron oxide (Fe3O4) particles to investigate their viability for hyperthermia applications. Induction heating of the magnetic hydrogels with varying concentration of magnetic powder was conducted at a frequency of 375 kHz for magnetic field strength varying from 1.7 kA/m (21 Oe) to 2.5 kA/m (31.4 Oe). It was observed that the maximum temperature induced in the magnetic hydrogels increased with the concentration of magnetic particles and magnetic field strength. The PNIPA gel underwent a collapse transition at 34 °C. It was found that a 2.5 wt.% Fe3O4 in PNIPA composite took 260 s to be heated to 45 °C under a magnetic field strength of 1.7 kA/m, the specific absorption rate (SAR) was found to be 1.83. SAR of iron oxide was found to be higher than the SAR of iron.
- Subjects
ACRYLAMIDE; HYDROGELS; BIOENGINEERING; IRON oxides; METAL powders; MAGNETIC fields
- Publication
Journal of Materials Science, 2009, Vol 44, Issue 5, p1381
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-006-1064-x