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SUMMARY:Understanding and controlling the formation of photonic crystals f
 rom polydisperse colloidal systems
DTSTART;VALUE=DATE-TIME:20211125T074800Z
DTEND;VALUE=DATE-TIME:20211125T074900Z
DTSTAMP;VALUE=DATE-TIME:20260306T080515Z
UID:indico-contribution-4366@events01.synchrotron.org.au
DESCRIPTION:Speakers: Katherine Chea (RMIT University)\nThe fundamentals o
 f crystallisation and glass formation are not yet fully understood. Colloi
 dal suspensions have been shown to be promising model systems for understa
 nding these processes. As colloidal motion is Brownian\, rather than balli
 stic\, kinetics and dynamics can be studied in real-time. It is well docum
 ented that colloidal suspensions can “successfully crystallise” when t
 he particles in the system have sufficiently low polydispersity.[1\,2] Thi
 s means that the particles must have a similar average size and shape. If 
 a system is highly polydisperse\, this will hinder the solidification proc
 ess.\n\nIn this work we will explore colloidal nanodiamonds. Nanodiamonds 
 are a topic of interest in many material studies due to their wide variety
 \, and unique mechanical and optical properties.[3\,4] Detonation nanodiam
 onds (DNDs) are of particular interest due to their unique fabrication pro
 cess. Due the detonation synthesis method\, the particles are small (sever
 al nm) and faceted\, but in solution self-assemble into highly irregular f
 ractal shapes.[5] Despite this high polydispersity\, when centrifuged\, th
 ese types of DNDs can yield incredibly ordered structures and form iridesc
 ent photonic crystals – this is highly surprising given the highly irreg
 ular structures of these materials. These photonic crystals were first dis
 covered by Grichko et al.\,[5] however\, the mechanisms behind these highl
 y ordered structures are still unknown. With a combination of lab techniqu
 es and beam time allocations at the Australian Synchrotron\, ANSTO and pot
 entially overseas neutron facilities\, we will systematically investigate 
 these nanodiamond photonic crystals\, and examine their structure and form
 ation kinetics.\n\nhttps://events01.synchrotron.org.au/event/146/contribut
 ions/4366/
LOCATION:Online
URL:https://events01.synchrotron.org.au/event/146/contributions/4366/
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