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Ansari F.,Cranfield University | Kavosh M.,Cranfield University | Horvath R.,Cranfield University | Horvath R.,Research Institute for Technical Physics and Materials Science MTA MFA | Ramsden J.J.,Cranfield University
Journal of Nanoparticle Research | Year: 2011

The kinetics of assembly of polyethylene glycol (PEG)-coated superparamagnetic Fe3O4 nanoparticles in aqueous suspension on planar Si(Ti)O2 surfaces have been determined using high-resolution optical waveguide lightmode spectroscopy (OWLS). Analysis of the results revealed that the initially uniform population was spontaneously transformed into two types of particles with significantly different adsorption behaviour. © 2010 Springer Science+Business Media B.V. Source


Ansari F.,Cranfield University | Kavosh M.,Cranfield University | Horvath R.,Cranfield University | Horvath R.,Research Institute for Technical Physics and Materials Science MTA MFA | And 2 more authors.
Journal of Bionanoscience | Year: 2010

In order to be able to optimize the decoration of bacteria with magnetic nanoparticles, we have developed a methodology for investigating the attachment of nanoparticles to the surface of bacteria by depositing a thin layer of the nanoparticles onto a Si(Ti)O 2 waveguide surface and measuring the bacterial (Rhodococcus erythropolis IGTS8) attachment kinetics under hydrodynamically controlled conditions. This is done by analysing the perturbation of the optical evanescent field generated by light guided along the substratum using optical waveguide lightmode spectroscopy (OWLS), with which the number of deposited particles and attached bacteria could be precisely and accurately determined. Despite the strong attachment implied by the positive surface charge of the nanoparticles and the negatively charged surface of the bacteria, the bacteria are initially attached reversibly. A criterion for ensuring that mixing of the nanoparticles and the bacteria is prolonged sufficiently for effective decoration to take place is proposed. Copyright © 2010 American Scientific Publishers All rights reserved. Source


Lugomer S.,Ruder Boskovic Institute | Zolnai Z.,Research Institute for Technical Physics and Materials Science MTA MFA | Toth A.L.,Research Institute for Technical Physics and Materials Science MTA MFA | Barsony I.,Research Institute for Technical Physics and Materials Science MTA MFA
Physica Status Solidi (C) Current Topics in Solid State Physics | Year: 2011

We studied the self-organization (SO) of small-size (D = 90 nm), medium-size (220 nm), and large-size (450 nm) colloidal silica nanoparticles in Langmuir-Blodgett layers induced by a focused Ga+ ion beam with energy of 30 keV. The ion irradiation induces SO into various types of clusters as the result of particle charging and heating, Coulomb repulsion and motion on the substrate surface, as well as of particle - particle and particle - substrate interaction. These processes show a great difference of the underlying dynamics and of the characteristics of SO pattern, depending on the particle size and on the ion fluence. The two dimensional (2D) pattern of the small-size particles is transformed into "infinite" chain-cluster, while the pattern of medium-size particles is transformed into a number of short separated chain-clusters. The pattern of large-size particles is mostly unchanged, but shows particle melting and buckling, which at higher fluences passes into ion beam-induced sputtering. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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