Milani, Amir H. published the artcileLight-Triggered Programming of Hydrogel Properties Using Sleeping Photoactive Polymer Nanoparticles, Application of 3-Amino-7-(diethylamino)-5-phenylphenazin-5-ium chloride, the publication is Chemistry of Materials (2021), 33(7), 2319-2330, database is CAplus.
A key characteristic of programmable hydrogels is that their phys. and chem. properties can be changed postsynthetically. In order to achieve this, we used sub-50 nm photoacid/base generator nanoparticles, which could alter the charge d./polarity of a host macroscopic hydrogel (e.g., polyacrylamide). The photoacid generator (PAG) nanoparticles, were composed of poly(Me methacrylate-co-4,5-dimethoxy-2-nitrobenzyl methacrylate-co-1,6-hexanediol diacrylate) and exhibited a pH-dependent swelling behavior when they were irradiated with UV light. Thus, using PAG nanoparticles enabled space-selective light-triggered swelling of host hydrogels by increasing the charge d. at alk. pH. Using photobase generator (PBG) nanoparticles, consisting of poly(Me methacrylate-co-2-nitrobenzyl Me 4-methacryloyloxy piperidine-1-carboxylate-co-1,6-hexanediol diacrylate), it was possible to space-selectively produce pos. charge, at acidic pH, within the host hydrogel network. PBG nanoparticles added several functionalities to the host hydrogel, including reversible writing/erasing patterns as well as postpolymn. in desired sites. Including mixtures of PAG and PBG nanoparticles caused deswelling of the host hydrogel upon UV-irradiation By increasing the mass fraction of PAG/PBG nanoparticles within the hydrogel, the deswelling effect was limited only to the top surface area, resulting in a monolayer actuator with a large bending angle. This study has successfully demonstrated the excellent potential of using PAG/PBG nanoparticles to confer photoresponsive behaviors that transform nonresponsive hydrogels into responsive hydrogels on demand. This system could be spatially tailored to provide a wide range of useful properties such as initiation sites for synthesis, writing/erasing, and actuation.
Chemistry of Materials published new progress about 4569-86-2. 4569-86-2 belongs to chlorides-buliding-blocks, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Benzene, name is 3-Amino-7-(diethylamino)-5-phenylphenazin-5-ium chloride, and the molecular formula is C22H23ClN4, Application of 3-Amino-7-(diethylamino)-5-phenylphenazin-5-ium chloride.
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