4 years ago

Unveiling Molecular Changes in Water by Small Luminescent Nanoparticles

Unveiling Molecular Changes in Water by Small Luminescent Nanoparticles
Dragana J. Jovanović, Lucía Labrador-Páez, José García-Solé, Manuel I. Marqués, Daniel Jaque, Miroslav D. Dramićanin, Harry Eugene Stanley, Patricia Haro-González, Krisjanis Smits, Francisco Jaque, Slobodan D. Dolić
Nowadays a large variety of applications are based on solid nanoparticles dispersed in liquids—so called nanofluids. The interaction between the fluid and the nanoparticles plays a decisive role in the physical properties of the nanofluid. A novel approach based on the nonradiative energy transfer between two small luminescent nanocrystals (GdVO4:Nd3+ and GdVO4:Yb3+) dispersed in water is used in this work to investigate how temperature affects both the processes of interaction between nanoparticles and the effect of the fluid on the nanoparticles. From a systematic analysis of the effect of temperature on the GdVO4:Nd3+ GdVO4:Yb3+ interparticle energy transfer, it can be concluded that a dramatic increase in the energy transfer efficiency occurs for temperatures above 45 °C. This change is properly explained by taking into account a crossover existing in diverse water properties that occurs at about this temperature. The obtained results allow elucidation on the molecular arrangement of water molecules below and above this crossover temperature. In addition, it is observed that an energy transfer process is produced as a result of interparticle collisions that induce irreversible ion exchange between the interacting nanoparticles. The interaction between nanoparticles and fluids has a major role in the properties of nanofluids. By means of nonradiative energy transfer between small luminescent nanoparticles dispersed in water, this work reveals how temperature affects the interactions between a liquid and particles. A crossover affecting diverse temperature-dependent water properties is evidenced in the change of the luminescence of the nanoparticles.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201700968

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