Characterising the amorphicity and porosity of ice aggregates in planet-forming collisions


With the discovery of almost 3000 exo-planets it is clear that planet formation is a by-product of star formation, yet in the micron ? cm size range, where relative velocities are just a few cm s-1, we still do not know how particles ?stick? forming larger ?boulders? until gravitational interactions lead to planet formation. It is postulated both ice-coated silicate aggregates may be the key. Here we propose to exploit the unique NIMROD fast acquisition times and wide Q-range to measure the meso-scale porosity of icy grain analogues, the aggregate granularity and porosity, concurrently with the inter-molecular bulk structure, and the subsequent evolution of the grains on heating. This will characterise particle size, shape, porosity and crystallinity vs amorphicity distributions, vital parameters when studying particle collisions and converting empirical data to planet forming models.

Metadata Access
Creator Dr Helen Fraser; Dr Tristan Youngs; Dr Sabrina Gaertner; Dr Bastian Gundlach; Professor Jurgen Blum; Dr Daniel Bowron; Dr Sergio Ioppolo; Miss Catherine Hill; Miss Judy Ratte
Publisher ISIS Neutron and Muon Source
Publication Year 2018
Rights CC-BY Attribution 4.0 International;
OpenAccess true
Contact isisdata(at)
Resource Type Dataset
Discipline Chemistry; Natural Sciences
Temporal Coverage Begin 2015-12-01T09:00:00Z
Temporal Coverage End 2015-12-05T09:00:00Z