A novel type of smart composite materials based on the directed assembly of organic dyes on a responsive microgel template was prepared and investigated. We have chosen Calcon, a monoazo dye, as model organic dye molecules and the copolymer microgel of poly(N-isopropylacrylamide-acrylic acid-acrylamide) [p(NIPAM-AA-AAm)] as template with the pAA segments designed for inducing pH-sensitivity and the pAAm segments designed for directing the highly ordered assembly of dye molecules. Transmission electron microscopy, X-ray scattering, and light scattering were used to study the dye assembling structures and the pH-induced volume phase transitions of the composite microgels. The UV−vis absorption and photoluminescence properties of the composite microgels were respectively investigated at different pH values and H 2 O 2 concentrations. The pH-induced shrinkage of the template microgels not only results in a systematic shift in the wavelength of bands, but also significantly increases the absorption and emission intensity. The composite microgels also exhibit a highly H 2 O 2 -sensitive fluorescence quenching. The pAAm-directed highly ordered assembling structure of dye molecules is critical to produce the unique pH/H 2 O 2 dual responsive optical properties, which may find important applications in bioimaging and biosensing.
No takes yet. Share an insight, caveat, or question.
Wu et al. (2009) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: