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Thermoresponsive gold polymer nanohybrids with a tunable cross-linked meo 2 ma polymer shell

AuthorsLapresta-Fernández, A. ; García-García, José M. ; París, R.; Huertas-Roa, R.; Salinas-Castillo, A.; Llana, S. A. de la; Huertas-Pérez, J. F.; Guarrotxena, Nekane ; Capitán-Vallvey, L. F.; Quijada-Garrido, Isabel
KeywordsNanohybrid colloids
Core–shell materials
Gold nanoparticles
Thermoresponsive materials
Issue Date2014
PublisherJohn Wiley & Sons
CitationParticle and Particle Systems Characterization 31: 1183-1191 (2014)
AbstractGold nanoparticles (AuNPs) are functionalized with a thermoresponsive polymer shell of a cross-linked poly(2-(2-methoxyethoxy)ethyl methacrylate) (P(MEO 2 MA)). To provide a covalent attachment of the polymer to the NP surface, AuNPs are fi rst modifi ed using butanoic acid to develop the encapsulation with the biocompatible thermoresponsive polymer formed by free-radical precipitation polymerization. Both the MEO 2 MA concentration and the shell cross-linking density can be varied and, in turn, the thickness and the shells' free volume can be fi ne-tuned. By downscaling the size of the polymeric shell, the lower critical solution temperature (LCST) is decreased. The LCST in the nanohybrids changes from 19.1 to 25.6 °C when increasing the MEO 2 MA content; it reaches almost 26 °C for P(MEO 2 MA) (bulk). The maximum decrease in the volume of the nanohybrids is around 40%, resulting in a modifi cation of the light scattering properties of the system and causing a change in the turbidity of the gel network. The sizes of the nanohybrids are characterized using both transmission electron microscopy and dynamic light scattering measurements. Optical properties of the colloidal systems are determined using the derived count rate measurements as an alternative to absorbance or transmittance measurements, confi rming the colloidal stability of the nanohybrid systems.
Identifiersdoi: 10.1002/ppsc.201400078
issn: 0934-0866
e-issn: 1521-4117
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