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

Preparation and applications of novel fluoroalkyl end-capped oligomeric nanocomposites

“…24). 110 Hitherto, there have been numerous reports for gold nanoparticle/hydrogel composites; [111][112][113][114][115][116] however, to the best of our knowledge, our finding is the first example of the facile preparation of gold nanoparticles without any catalysts through fluorinated polysoaps possessing the LCST-triggered sol-gel switching characteristic.…”

“…110 The LCST-triggered gel formation of R F -(DOBAA) x -(ACMO) y -R F /Au nanocomposites would be due to an intracomposite's hydrophilic-hydrophobic conformational change, which leads to hydrophobic interactions related to the oleophilic DOBAA segments in composites between R F -(DOBAA) x -(ACMO) y -R F /Au nanocomposites. 110 Cooling the nanocomposite gels to below the LCST causes the architecture of R F -(DOBAA) x -(ACMO) y -R F /Au nanocomposites to the hydrophilic state, which affords the well-dispersed wine-red color nanocomposite sol solution (Fig. 24).…”

“…109 The thermosensitive fluoroalkyl end-capped N-(1,1-dimethyl-3-oxobutyl)acrylamide-acryloylmorpholine cooligomer was applied to the autoreduction of gold ions to afford the fluorinated cooligomeric nanocomposite-encapsulated gold nanoparticles under very mild conditions (Scheme 24); although the corresponding non-fluorinated cooligomer was not able to afford the gold nanoparticles at all under similar conditions. 110 These fluorinated cooligomeric nanocomposites exhibited a plasmon absorption band around 520 nm related to the formation of gold nanoparticles in their aqueous solutions (Fig. 22).…”

“…22). 110 Interestingly, these fluorinated nanocompositeencapsulated 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 (Fig. 23).…”

Color-changing behavior of fluoroalkyl end-capped 2-methacryloyloxyethanesulfonic acid oligomer/polyaniline nanocomposites, triggered by a variety of basic compounds

“…We have hitherto comprehensively studied on the preparation and applications of fluoroalkylated polymers, especially, ABA triblock-type fluoroalkyl end-capped oligomers [R F -(M) n -R F : R F = fluoroalkyl groups, M=radical polymerizable monomer], and these fluorinated oligomers can exhibit a wide variety of unique properties such as high solubility, surface-active property, and nanometer size-controlled molecular aggregates, which cannot be achieved by the corresponding non-fluorinated and randomly fluoroalkylated ones [33][34][35][36][37]. The self-assembled fluorinated oligomeric aggregates formed by these fluoroalkyl end-capped oligomers can provide suitable host moieties to interact with numerous guest molecules such as fullerene, carbon nanotubes, gold, silver and copper nanoparticles, and organic dyes, affording the corresponding fluorinated aggregates/guest molecules nanocomposites [38][39][40][41][42][43][44][45][46][47]. In addition, preparation of poly(vinylidene fluoride) copolymers/silica nanocomposites has been reported including their unique properties [48][49][50].…”