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New sampling technique for collection of nanoparticles from liquids

New sampling technique for collection of nanoparticles from liquids
New sampling technique for collection of nanoparticles from liquids
Transmission electron microscopy (TEM) is the only technique which can give accurate information on the individual size, shape and composition of NPs. However, in dilute forms it is difficult to collect a sufficient number of NPs on an electron microscope grid for TEM analysis without some means of concentrating the dispersion of NPs. This study introduces a novel TEM sampling technique which overcomes this shortcoming and allows for both the natural and engineered NPs in dilute dispersions as found in waste and contaminated waters to be selectively sampled, based on their electrical charge. The technique is based on the use of carefully functionalized collector surfaces built by using the layer-by-layer assembly of polyelectrolytes on TEM grids. The layers are electrically charged and the top layer will attract and retain oppositely charged sampled NPs from aqueous solutions. The ability of the collector to attract both single particles and particle aggregates on the top polyelectrolyte layer collected from dilute aqueous dispersions after a short sampling time is demonstrated from the TEM images. The nature of the particles attracted to the collector can be identified from the TEM images, their diffraction pattern and the EDX spectrum.
nanoparticles, dispersions, collector, sampling, identification, tem
1388-0764
1-10
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Crossley, A.
5fc762d8-0607-4e7a-8a9b-b388e2d4ef3b
Dobson, P.
f3138ee8-eec8-456e-a2e3-826c8907eb65
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Crossley, A.
5fc762d8-0607-4e7a-8a9b-b388e2d4ef3b
Dobson, P.
f3138ee8-eec8-456e-a2e3-826c8907eb65

Ratoi, M., Crossley, A. and Dobson, P. (2013) New sampling technique for collection of nanoparticles from liquids. Journal of Nanoparticle Research, 15 (1730), 1-10. (doi:10.1007/s11051-013-1730-2).

Record type: Article

Abstract

Transmission electron microscopy (TEM) is the only technique which can give accurate information on the individual size, shape and composition of NPs. However, in dilute forms it is difficult to collect a sufficient number of NPs on an electron microscope grid for TEM analysis without some means of concentrating the dispersion of NPs. This study introduces a novel TEM sampling technique which overcomes this shortcoming and allows for both the natural and engineered NPs in dilute dispersions as found in waste and contaminated waters to be selectively sampled, based on their electrical charge. The technique is based on the use of carefully functionalized collector surfaces built by using the layer-by-layer assembly of polyelectrolytes on TEM grids. The layers are electrically charged and the top layer will attract and retain oppositely charged sampled NPs from aqueous solutions. The ability of the collector to attract both single particles and particle aggregates on the top polyelectrolyte layer collected from dilute aqueous dispersions after a short sampling time is demonstrated from the TEM images. The nature of the particles attracted to the collector can be identified from the TEM images, their diffraction pattern and the EDX spectrum.

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More information

Accepted/In Press date: 5 June 2013
Published date: June 2013
Keywords: nanoparticles, dispersions, collector, sampling, identification, tem
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 353215
URI: http://eprints.soton.ac.uk/id/eprint/353215
ISSN: 1388-0764
PURE UUID: a3aad42c-82c1-4cb8-97cc-b2974acfe6f2

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Date deposited: 03 Jun 2013 10:11
Last modified: 19 Jul 2019 21:34

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Contributors

Author: M. Ratoi
Author: A. Crossley
Author: P. Dobson

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