Phototropic Multiresponsive Active Nanogels
Copyright policy )Phototropic Multiresponsive Active Nanogels
AbstractAqueous dispersions of nanogels that respond to switches in environmental pH and/or temperature by changes in their hydrodynamic radius (Rh) and/or ζ‐potential are prepared by reversible addition‐fragmentation chain‐transfer (RAFT) polymerization‐induced thermal (70 °C) self‐assembly (PITSA) of N‐isopropylacrylamide (NIPAM) in the presence of a poly(methacrylic acid) (PMAA)‐substituted macromolecular chain transfer agent and a cross‐linker. Photochromic spiropyran (SP) moieties are coupled to the carboxylic acid groups of the nanogels. Upon UV irradiation, the neutral SP isomerizes to the zwitterionic merocyanine (ME) form. Upon UV light irradiation, microgels formed by assembly of SP nanogels undergo a collective motion toward the UV‐light source.
MOTION, Surface Properties, Ultraviolet Rays, Nanogels, [SPI.MAT]Engineering Sciences [physics]/Materials, Polymerization, microgels, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Particle Size, collective motion, multi-stimuli-responsiveness, Acrylamides, Molecular Structure, Temperature, AUTONOMOUS MOVEMENT, [CHIM.MATE]Chemical Sciences/Material chemistry, self-assembly, Hydrogen-Ion Concentration, Photochemical Processes, POLYMERIZATION, [CHIM.POLY]Chemical Sciences/Polymers, Chemical sciences, Hydrodynamics, nano, POLYMERS, active matter, Nano-technology
MOTION, Surface Properties, Ultraviolet Rays, Nanogels, [SPI.MAT]Engineering Sciences [physics]/Materials, Polymerization, microgels, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Particle Size, collective motion, multi-stimuli-responsiveness, Acrylamides, Molecular Structure, Temperature, AUTONOMOUS MOVEMENT, [CHIM.MATE]Chemical Sciences/Material chemistry, self-assembly, Hydrogen-Ion Concentration, Photochemical Processes, POLYMERIZATION, [CHIM.POLY]Chemical Sciences/Polymers, Chemical sciences, Hydrodynamics, nano, POLYMERS, active matter, Nano-technology
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