From landslides to granular hoppers: can local structure metrics predict flow properties of granular materials?
The flow of granular materials are relevant to any industrial transport process of particulate matter – from minerals and sand to powders and pharmaceutical pills. Flow phenomena of loose or compacted granular materials are also important on the geophysical scale, in landslides, dunes or erosion processes. This proposed PhD thesis project uses state-of-the-art simulation methods for simulating granular flows Read more
We will be hosting the 2016 Boden Research conference in Yallingup / Western Australia, from 19-23 Sept 2016. The conference theme is the emergence and function of complex nanostructures in biological tissue and synthetic self-assembly. Check out the conference website, and see you in Yallingup!
Congratulations to Matthias Saba for the successful defence of his PhD thesis “Photonic crystals with chirality — Group theory, algorithmic tools and experimental approaches for Gyroid-like photonic material” (see link) in December 2015.
In a totally different context to the original quote and article, Phil Anderson’s quote “More is different” holds also for the chiro-optical response of gyroid-based photonic materials. Eight intergrown Gyroids give a substantially different chiro-optical response than the single gyroid. The group theoretic prediction from Matthias Saba’s PhD work (Saba et al, PRB 2013) has now been experimentally validated by Nanofabrication experiments in the Center for Microphotonics at Swinburne University (Turella et al, Optics Letters, 2015). Read more
“In a Material World: Hyperbolic Geometry in Biological Materials”, by Myf Evans and myself, is a popular-science type essay on the sort of geometric questions that we see of relevance for soft matter physics, materials science, biology, etc. In particular, what’s the role of hyperbolic geometry and triply-periodic minimal surfaces, and what’s the geometric rationale why they form in soft matter self-assembly. Hopefully an entertaining read, with no claim to be comprehensive, and certainly not original research. Read more
The bicontinuous phases, composed of two interthreaded channels separated by a matrix domain have a firm place in soft matter self-assembly, from lipids to copolymers. This post high-lights some of our recent work that shows that more complicated geometries, with three rather than two channel domains, may also result from self-assembly. Read more
We’re still accepting abstracts for what shapes up to be an exciting international conference on real-world materials, dead and alive, with complex spatial microstructures. An interdisciplinary discussion meeting on patterns and geometry, and their role in biological and synthetic microstructured materials and tissue. We invite contributions from biology, chemistry, materials science, mathematics, physics and related fields addressing the genesis, properties and function of complex nano-scale geometries, as well as underlying geometric and topological concepts for the study of complex structure and shape. More information can be found on www.shape-up.academy. See you in Berlin! Read more
The cubic Gyroid surface is a “bicontinuous” minimal surface that divides space into two intertwined network- or labyrinth-like subdomains. The two subdomains are enantiomorphic, that is identical apart from different handedness. This animation shows a rotation of a fairly large subsection of this periodic surface, and a flight through one of the two domains. The flight path first follows a three-fold screw axis, and then turns into a four-fold screw axis. In a second run of the same animation, the same surface is shown together with the skeletal graphs that are often used to represent the Gyroid.
A higher resolution file of this animation can be found here (15MB). An even higher resolution version (90MB) is available here.
If you are using this animation, please reference the publication that describes it: Hyde & Schröder-Turk, Geometry of interfaces: topological complexity in biology and materials, Interface Focus 2(5), 529-538 (2012)
This animation was produced at the ANU during my PhD. Special thanks to Stuart Ramsden for a lot of help!