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Author
J. Kim
S. Michelin
M. Hilbers
L. Martinelli
E. Chaudan
G. Amselem
E. Fradet
J.-P. Boilot
A.M. Brouwer
C.N. Baroud
J. Peretti
T. Gacoin
Date
9-2017
Title
Monitoring the orientation of rare-earth-doped nanorods for flow shear tomography
Journal
Nature Nanotechnology
Volume | Issue number
12 | 9
Pages (from-to)
914-919
Document type
Article
Faculty
Faculty of Science (FNWI)
Institute
Van 't Hoff Institute for Molecular Sciences (HIMS)
Abstract
Rare-earth phosphors exhibit unique luminescence polarization features originating from the anisotropic symmetry of the emitter ion's chemical environment. However, to take advantage of this peculiar property, it is necessary to control and measure the ensemble orientation of the host particles with a high degree of precision. Here, we show a methodology to obtain the photoluminescence polarization of Eu-doped LaPO4 nanorods assembled in an electrically modulated liquid-crystalline phase. We measure Eu3+ emission spectra for the three main optical configurations (sigma, pi and alpha, depending on the direction of observation and the polarization axes) and use them as a reference for the nanorod orientation analysis. Based on the fact that flowing nanorods tend to orient along the shear strain profile, we use this orientation analysis to measure the local shear rate in a flowing liquid. The potential of this approach is then demonstrated through tomographic imaging of the shear rate distribution in a microfluidic system.
URL
go to publisher's site
Language
English
Note
With supplementary file
Permalink
http://hdl.handle.net/11245.1/b25a0f42-d244-4854-ab13-507ab6f8c773

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