Premium
Unveiling Molecular Changes in Water by Small Luminescent Nanoparticles
Author(s) -
LabradorPáez Lucía,
Jovanović Dragana J.,
Marqués Manuel I.,
Smits Krisjanis,
Dolić Slobodan D.,
Jaque Francisco,
Stanley Harry Eugene,
Dramićanin Miroslav D.,
GarcíaSolé José,
HaroGonzález Patricia,
Jaque Daniel
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201700968
Subject(s) - nanofluid , nanoparticle , materials science , chemical physics , luminescence , energy transfer , nanocrystal , chemical engineering , nanotechnology , molecule , work (physics) , thermodynamics , chemistry , optoelectronics , organic chemistry , physics , engineering
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 (GdVO 4 :Nd 3+ and GdVO 4 :Yb 3+ ) 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 GdVO 4 :Nd 3+ → GdVO 4 :Yb 3+ 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.