Thermodynamics of Photoresponsive Polyelectrolyte–Dye Assemblies with Irradiation Wavelength Triggered Particle Size
作者： Immanuel Willerich , Franziska Gröhn
DOI: 10.1021/MA200538E
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摘要: Electrostatic self-assembly of polyelectrolytes and photoresponsive dye counterions can yield supramolecular nanoparticles in aqueous solution, the size which be controlled through light irradiation with varying wavelengths. Nanoparticles are formed from fourth-generation poly(amido amine) dendrimers an excess oppositely charged anionic diazo dyes Acid Yellow 38 (Ay38) or Direct 12 (Dy12). Particle stability is provided by a negative particle charge originating dye. Irradiation UV leads to partial isomerization trans-dye cis-isomer. The degree controls continuously very precisely, enabling radii between 30 250 nm. Quantitative insight based on surface area, density, thermodynamics binding. Dynamic scattering (DLS) zeta-potential measurements have been used study stabilization, isothermal titration calorimetry (ITC) was applied determine enth...
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