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"Callaghan, Paul T"
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Rheo NMR and shear banding
The phenomenon of shear banding in complex fluids has been investigated using NMR velocimetry and NMR spectroscopy, mostly in wormlike micelle systems, but more recently in colloidal systems and multilayer vesicles. A particular advantage of NMR is the ability to simultaneously investigate structural ordering and to compare such ordering with local strain rates. In this paper, we describe the basics of Rheo-NMR and summarise its recent application to the study of shear banding.
Journal Article
Wool to Weta
Evaluating the competitiveness of New Zealand's current economy, this authoritative analysis argues the need to switch from agriculture and tourism as the economic backbone of the country and suggests that the emerging industries of science, technology, and intellectual property will offer more prosperity. Highlighting interviews with entrepreneurs who are creating successful science- and technology-based businesses—including Weta workshop, the cinema special effects company that worked on the Lord of the Rings film trilogy—the study explores vital topics regarding sustainable wealth and cultural change. Interviewees include physicist Andrew Coy, professor Bill Denny, entrepreneur Stephen Tindall, and Weta workshop creator and director Richard Taylor.
eBook
Generalized approach to NMR analysis of flow and dispersion in porous media
A generalized approach to the use of pulsed‐gradient spin echo (PGSE) NMR methods for the measurement of flow and diffusion in porous media is presented, in which the fluid dynamics is probed over well‐defined temporal and spatial domains. Various NMR techniques based on PGSE encoding are described in the context of standard theories of dispersion, with reference to Eulerian and Lagrangian coordinate frames. This array of methods provides access not only to the dispersion coefficient and the mean local velocity but also to propagators relevant to spatial and temporal correlations. Methods investigated include flow imaging, average propagator analysis, dispersion measurement, velocity exchange spectroscopy, and flow and disffraction based on scattering analysis. We apply these to a study of flow and dispersion of water in a packed bed of 90.7‐μm‐dia. polystyrene latex spheres. Our measurements of the dependence on Peclet number of dispersion (parallel and perpendicular to the mean flow direction) are in excellent agreement with results reported in the literature. The scattering approach used here has potential for studying complex flow properties involving the interplay between hydrodynamic and structural characteristics of porous media.
Journal Article
Get off the Grass
In a brilliant intellectual adventure that ranges from David Ricardo and Adam Smith to economic geography and the science of complex networks, Shaun Hendy and Paul Callaghan explore how New Zealanders can learn to live off knowledge rather than nature. The key to increasing New Zealand's prosperity, they argue, is innovation in high-tech niches. To catch up with the countries that lure young Kiwis away, New Zealand needs to start innovating like a city of four million people; it needs to start taking science seriously; it needs to start seeing its people as people of learning, not just of the land. Get off the Grass provides a readable introduction to a wide variety of ideas including economic geography, network theory, and complexity theory; offers unique insights into the New Zealand economy and its long-term prospects; adds to current debates worldwide about innovation, science, economic growth, and networks.
eBook
Anomalous shear banding: multidimensional dynamics under fluctuating slip conditions
The strain-controlled flow of a wormlike micellar solution in cylindrical Couette geometries with smooth and rough glass inner walls is investigated using 2D
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H NMR velocimetry. We find anomalous shear banding in which fluctuating slip dynamics in combination with surfactant properties lead to a non-lever rule behaviour where the interface position remains constant while the high and low shear rates change. Velocities in the flow direction are imaged in the flow-gradient/vorticity plane. The spatiotemporal resolution achieved reveals fluctuations in flow structure along the vorticity axis and instability of the high shear band.
Journal Article
Get off the Grass
In a brilliant intellectual adventure that ranges from David Ricardo and Adam Smith to economic geography and the science of complex networks, Shaun Hendy and Paul Callaghan explore how New Zealanders can learn to live off knowledge rather than nature. The key to increasing New Zealand's prosperity, they argue, is innovation in high-tech niches. To catch up with the countries that lure young Kiwis away, New Zealand needs to start innovating like a city of four million people; it needs to start taking science seriously; it needs to start seeing its people as peo
Book
THE MACDIARMID INSTITUTE AND NANOTECHNOLOGY RESEARCH IN NEW ZEALAND
An overview of nanotechnology research in New Zealand is given, with particular emphasis on the work of the MacDiarmid Institute, a multi-university and government laboratory partnership.
Book Chapter
