Facile preparation of gold nanoparticles through autoreduction of gold ions in the presence of fluoroalkyl end-capped cooligomeric aggregates: LCST-triggered sol-gel switching behavior of novel thermoresponsive fluoroalkyl end-capped cooligomeric nanocomposite-encapsulated gold nanoparticles.
Thermosensitive fluoroalkyl end-capped N-(1,1-dimethyl-3-oxobutyl)acrylamide-acryloylmorpholine cooligomer, which was prepared by the cooligomerization of fluoroalkanoyl peroxide with the corresponding monomers, was applied to the autoreduction of gold ions to afford the fluorinated cooligomeric nanocomposite-encapsulated gold nanoparticles under very mild conditions; although the corresponding non-fluorinated cooligomer was not able to afford the gold nanoparticles at all under similar conditions. These fluorinated cooligomeric nanocomposites exhibited a plasmon absorption band around 520 nm related to the formation of gold nanoparticles in their aqueous solutions. Interestingly, these fluorinated nanocomposite-encapsulated gold nanoparticles can exhibit the thermoswitchable sol-gel transition through the lower critical solution temperature (LCST)-triggered aggregation of the corresponding nanocomposites, and this sol-gel switching behavior is reversible during a heating and cooling cycle.
Sawada
Hideo
H
Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, Bunkyo-cho, Hirosaki 036-8561, Japan. hideosaw@cc.hirosaki-u.ac.jp
Takahashi
Keigo
K
D005782:Gels / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D015394:Molecular Structure; D010316:Particle Size; D013499:Surface Properties; D013696:Temperature
D005782:Gels; D007477:Ions; D006046:Gold