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Angew Chem Int Ed Engl. 2016 Sep 19;55(39):11770-4. doi: 10.1002/anie.201603844. Epub 2016 Jul 27.

Simultaneous Identification of Spectral Properties and Sizes of Multiple Particles in Solution with Subnanometer Resolution.

Author information

1
Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Kolloidchemie, Forschungscampus Golm, Am Mühlenberg, 14424, Potsdam, Germany.
2
Izmir Institute of Technology, Chemistry Department, 35430, Izmir, Turkey.
3
University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX, 78229-3901, USA.
4
Physikalische Chemie, TU Dresden, Bergstrasse 66b, 01062, Dresden, Germany.
5
Institute of Particle Technology (LFG), Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Cauerstrasse 4, 91058, Erlangen, Germany.
6
Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Haberstrasse 9a, 91058, Erlangen, Germany.
7
BASF SE, GKC/O-G201, 67056, Ludwigshafen, Germany.
8
University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX, 78229-3901, USA. demeler@biochem.uthscsa.edu.
9
Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Kolloidchemie, Forschungscampus Golm, Am Mühlenberg, 14424, Potsdam, Germany. helmut.coelfen@uni-konstanz.de.
10
Universität Konstanz, Physikalische Chemie, Universitätsstrasse 10, 78457, Konstanz, Germany. helmut.coelfen@uni-konstanz.de.

Abstract

We report an unsurpassed solution characterization technique based on analytical ultracentrifugation, which demonstrates exceptional potential for resolving particle sizes in solution with sub-nm resolution. We achieve this improvement in resolution by simultaneously measuring UV/Vis spectra while hydrodynamically separating individual components in the mixture. By equipping an analytical ultracentrifuge with a novel multi-wavelength detector, we are adding a new spectral discovery dimension to traditional hydrodynamic characterization, and amplify the information obtained by orders of magnitude. We demonstrate the power of this technique by characterizing unpurified CdTe nanoparticle samples, avoiding tedious and often impossible purification and fractionation of nanoparticles into apparently monodisperse fractions. With this approach, we have for the first time identified the pure spectral properties and band-gap positions of discrete species present in the CdTe mixture.

KEYWORDS:

analytical methods; colloids; nanoparticles

PMID:
27461742
PMCID:
PMC5148131
DOI:
10.1002/anie.201603844
[Indexed for MEDLINE]
Free PMC Article

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