Effect of Gold Nanoparticles on the Thermosensitivity, Morphology, and Optical Properties of Poly(acrylamide–acrylic acid) Microgels

Abstract

Novel positive thermosensitive microgels of poly(acrylamide-acrylic acid) with embedded gold nanoparticles have been synthesized and characterized by means of dynamic light scattering, UV-vis spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy. These systems show temperature (upper critical solution temperature-like volume phase transition) and optical responsiveness making them externally triggered systems.

Poly(N-acryloylglycinamide) microgels as nanocatalyst platform

“…Microgels that exhibit the opposite thermoresponse, "thermophilicity" or "positive thermosensitivity" due to their upper critical solution temperature (UCST)-type behaviour have also been reported. [16][17][18][19][20][21][22][23] The microgels that expand upon heating are mostly based on polyacrylamide (PAM) with a charged polymer such as poly(acrylic acid) (PAA) [16][17][18][19][20][21][22] or poly(2acrylamide-2-methylpropanesulfonic acid) (PAMPS). 23 These polymers form associative complexes at low temperatures by intermolecular hydrogen bonding between the repeating units.…”

Polymer Protected Gold Nanoparticles: Synthesis, Characterization and Application in Catalysis

“…The development of thermoresponsive hybrid poly(acrylamide-acrylic acid) microgels within of which the AuNPs were encapsulated has been reported in [32]. The effect of the nanoparticles on the thermosensitivity, morphology, and optical properties of the microgel was evaluated.…”

Review on synthesis, properties, characterization, and applications of responsive microgels fabricated with gold nanostructures

“…That temperature at which volume phase transition occurs in positive temperature-responsive microgels is termed as the upper critical solution temperature (UCST). Echeverria and Mijangos (2010) have reported such microgels. They synthesized p(AAm-co-AAc) microgels and Au-p(AAm-coAAc) hybrid microgels.…”

“…In this way, positive temperatureresponsive microgels are synthesized by inverse emulsion polymerization. Echeverria and Mijangos (2010) have synthesized Au-poly(acrylamide-co-AAc) [Au-p(AAm-co-AAc)] core-shell hybrid microgels using this method.…”

“…Negative and positive temperature-responsive polymers are synthesized by precipitation and inverse emulsion polymerization, respectively (Echeverria andMijangos 2010, Shi et al 2013). Precipitation polymerization for the synthesis of temperature-responsive microgels is carried out at a temperature greater than the volume phase transition temperature (VPTT) of the microgels in aqueous medium.…”