Premium
Acoustically Levitated Droplets
Author(s) -
Leiterer Jork,
Grabolle Markus,
Rurack Knut,
ReschGenger Ute,
Ziegler Jan,
Nann Thomas,
Panne Ulrich
Publication year - 2008
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1430.039
Subject(s) - levitation , cuvette , acoustic levitation , fluorescence , evaporation , materials science , fluorescence spectroscopy , analytical chemistry (journal) , signal (programming language) , laser induced fluorescence , spectroscopy , laser , chemistry , optics , chromatography , thermodynamics , physics , quantum mechanics , computer science , magnet , programming language
Acoustic levitation is used as a new tool to study concentration‐dependent processes in fluorescence spectroscopy. With this technique, small amounts of liquid and solid samples can be measured without the need for sample supports or containers, which often limits signal acquisition and can even alter sample properties due to interactions with the support material. We demonstrate that, because of the small sample volume, fluorescence measurements at high concentrations of an organic dye are possible without the limitation of inner‐filter effects, which hamper such experiments in conventional, cuvette‐based measurements. Furthermore, we show that acoustic levitation of liquid samples provides an experimentally simple way to study distance‐dependent fluorescence modulations in semiconductor nanocrystals. The evaporation of the solvent during levitation leads to a continuous increase of solute concentration and can easily be monitored by laser‐induced fluorescence.