@misc{10481/89589,
year = {2016},
url = {https://hdl.handle.net/10481/89589},
abstract = {Gold patchy nanoparticles (PPs) were prepared under surfactant-free conditions by functionalization with a binary ligand mixture of polystyrene and poly(ethylene glycol) (PEG) as hydrophobic and hydrophilic ligands, respectively. The interfacial activity of PPs was compared to that of homogeneous hydrophilic nanoparticles (HPs), fully functionalized with PEG, by means of pendant drop tensiometry at water/air and water/decane interfaces. We compared interfacial activities in three different spreading agents: water, water/chloroform, and pure chloroform. We found that the interfacial activity of PPs was close to zero (∼2 mN/m) when the spreading agent was water and increased to ∼14 mN/m when the spreading agent was water/chloroform. When the nanoparticles were deposited with pure chloroform, the interfacial activity reached up to 60 mN/m by compression. In all cases, PPs exhibited higher interfacial activity than HPs, which were not interfacially active, regardless of the spreading agent. The interfacial activity at the water/decane interface was found to be significantly lower than that at the water/air interface because PPs aggregate in decane. Interfacial dilatational rheology showed that PPs form a stronger elastic shell at the pendant drop interface, compared to HPs. The significantly high interfacial activity obtained with PPs in this study highlights the importance of the polymeric patchy shell and the spreading agent.},
organization = {This work was supported by the Spanish MINECO (projects MAT2013-44429-R and MAT2014-60615R), by “Junta de Andalucía” and FEDER (projects P10-FQM-5977 and P12-FQM-1443), by the European Research Council (ERC Advanced Grant #267867 Plasmaquo), and by the Brazilian Funding Agency FAPESP (2012/21930-3 and 2014/01807-8). J.J.G.-C. acknowledges the Ministry of Economy and Competitiveness for a Juan de la Cierva fellowship (#JCI-2012-12517).},
title = {Interfacial Activity of Gold Nanoparticles Coated with a Polymeric Patchy Shell and the Role of Spreading Agents},
doi = {10.1021/acsomega.6b00131},
author = {Fernández Rodríguez, Miguel Ángel and Percebom, Ana M. and Giner Casares, Juan José and Rodríguez Valverde, Miguel Ángel and Cabrerizo Vílchez, Miguel Ángel and Liz Marzán, Luis and Hidalgo Álvarez, Roque Isidro},
}