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Séminaire Robert Corkery

Scattering studies in the space partitioning systems of sphere packings and random foams


Scattering studies in the space partitioning systems of sphere packings and random foams

Robert W. Corkery

KTH, Stockholm and ANU, Canberra

Aggregates of polyhedral silica bubbles with nanometric cells and space filling approaching 100% (nanofoams) are useful materials for studying the structure and formation of high volume fraction random foams close to the dry limit.

Results to be presented here include experimental scattering from randomly structured nano-scale foams and simulated scattering from 100% dry random foams. These results will be compared with scattering from jammed nanoemulsions (wet foam analogues), and radial distribution functions obtained from tomography of wet foams and sphere packings.

Results from simulated scattering yield an effective structure factor for dry foams. The utility of this is demonstrated, for example, by prediction of the average foam cell size in a monodisperse nanofoam from its scattering curve (I(q) vs q), the cell sizes verified by independent experimental methods.

Several key measures are also obtained from the scattering and tomographic data sets. Some general trends emerge in the relationship between these measures in wet foams, sphere packings, dry foams and other disordered materials. Hypotheses for these relationships are presented and discussed.

Agenda

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