INOR 309 |
| Stimuli-responsive hydrogels undergo large conformational changes only with small changes in the environment. Photosensitive phosphorescent hydrogel microspheres synthesized by incorporating an inorganic phosphor, [Au(TPPTS)3]Na8, into the polymer network of poly-N-isopropylacrylamide (PNIPAM)-co-allylamine and the resulting material exhibited sensitized Au-centered emission compared to that of the gold complex in pure water. These phosphorescent microspheres were further crosslinked by covalently bonding neighboring particles. The resulting hydrogels showed a remarkable temperature-dependent luminescence with full hysteresis upon reversible heating and cooling between the luminescent form at room temperature and the quenched form at body temperature. The stimuli-responsive behavior of these hydrogels remained unaltered even in presence of the gold luminophore. Phosphorescent hydrogels with longer lifetimes are preferred for various bio-medical applications over fluorescent hydrogels with shorter life-times known, albeit scarcely, in the literature. To our knowledge, the work herein represents the first example of a phosphorescent hydrogel. |
|
Nanoscience: Applications
7:00 PM-10:00 PM, Sunday, 10 September 2006 Moscone Center -- Hall D, Poster
Division of Inorganic Chemistry |