6 research outputs found
Quantitative imaging of concentrated suspensions under flow
We review recent advances in imaging the flow of concentrated suspensions,
focussing on the use of confocal microscopy to obtain time-resolved information
on the single-particle level in these systems. After motivating the need for
quantitative (confocal) imaging in suspension rheology, we briefly describe the
particles, sample environments, microscopy tools and analysis algorithms needed
to perform this kind of experiments. The second part of the review focusses on
microscopic aspects of the flow of concentrated model hard-sphere-like
suspensions, and the relation to non-linear rheological phenomena such as
yielding, shear localization, wall slip and shear-induced ordering. Both
Brownian and non-Brownian systems will be described. We show how quantitative
imaging can improve our understanding of the connection between microscopic
dynamics and bulk flow.Comment: Review on imaging hard-sphere suspensions, incl summary of
methodology. Submitted for special volume 'High Solid Dispersions' ed. M.
Cloitre, Vol. xx of 'Advances and Polymer Science' (Springer, Berlin, 2009);
22 pages, 16 fig
Preparation of multifunctional nanoparticles and their assemblies
This article describes the synthesis of multifunctional nanoparticulate systems and a range of organic reactions for modifying the surface functionalities of these particles and their composites. The reactions include surface silanization, amine-azide conversion, azide-alkyne 'click' chemistry, thiol and amine click chemistry and amide coupling. In addition, we discuss a number of relevant nanoparticle preparations to exemplify the interrelationship of these reactions. This system can readily be adapted to produce a wide range of composites with different features, such as fluorescence, magnetism, plasmon resonance and multiple biofunctionalities.</p