296 Citations
Genèse de silice supergène sur Terre et implications sur Mars
- Physics
- 2015
La silice (SiO2), composant important des planetes telluriques, se trouve sous diverses formes. La genese de ses polymorphes amorphes et mal cristallises (opale-A, opale-CT, calcedoine) est encore…
Paleomagnetic dating of ironstone nodules (‘nuts’) from the Yowah opal field, central southern Queensland
- Geology
- 2017
ABSTRACT To constrain the age of Australian opal formation, we have undertaken a paleomagnetic study of oxidised ironstone ‘nuts’ from Yowah, Queensland. Following standard methods, we have…
Designing a High-Crystallinity Nano-Gapped Particle Superlattice via DNA-Guided Colloidal Crystallization and Dehydration
- Materials ScienceCrystal Growth & Design
- 2022
Dental composites for wide color matching
- Materials Science, PhysicsSmart Structures and Materials + Nondestructive Evaluation and Health Monitoring
- 2022
Nanotechnology-based dental composites, see Tokuyama Dental's OMNICHROMA, can address the issue of color mismatch between tooth and filling. Similar to a chameleon, the filling can match the color of…
Formation of Sediment-Hosted Opal-AG at Lightning Ridge (New South Wales, Australia): Refining the Deep Weathering Model
- Environmental ScienceThe Journal of Geology
- 2022
Formation of sedimentary opal-AG in opal fields of eastern Australia has been linked to intensive weathering of their Cretaceous host rocks—the “deep weathering” model. Here we examine possible links…
Self-Assemblies of Gold Nanocrystals: Unexpected Properties
- ChemistryThe Journal of Physical Chemistry C
- 2021
An Experimental and Theoretical Determination of Oscillatory Shear-Induced Crystallization Processes in Viscoelastic Photonic Crystal Media
- Materials ScienceMaterials
- 2021
A complementary generic spatio-temporal model is developed of crystallization due to shear-dependent interlayer viscosity, giving propagating crystalline fronts with increasing applied strain, and a gradual transition from interparticle disorder to order.
Understanding hierarchical spheres-in-grating assembly for bio-inspired colouration
- PhysicsMaterials Horizons
- 2021
Mechanistic and predictive understanding is provided on spheres-in-grating assembly towards hierarchical structure with colouration effects as found in nature, exploiting embossed polymer gratings…
Anisotropic Iridescence and Polarization Patterns in a Direct Ink Written Chiral Photonic Polymer
- Physics, Materials ScienceAdvanced materials
- 2021
This work synthesizes a suitable chiral nematic liquid crystal elastomer ink is synthesized for direct ink writing, which self-assembles into a chiral photonic structure, which exhibits atypical iridescence and polarization selectivity.
Silicon-Oxygen Region Infrared and Raman Analysis of Opals: The Effect of Sample Preparation and Measurement Type
- Physics
- 2021
An extensive infrared (IR) spectroscopy study using transmission, specular and diffuse reflectance, and attenuated total reflection (ATR) was undertaken to characterise opal-AG, opal-AN (hyalite),…
References
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Die Optik der Edelopale
- Chemistry
- 1932
Inhalt . Einleitung 183 1. Die homogenen Louchtkömer 184 2. Methodisches 185 3. Beschreibung der Erscheinung 187 4. Die verschiedenen Reflektogrammtypen 189 ö. Großzwillinge 196 6. Allgemeines zur…
Über Bragg‐Reflexe mit sichtbarem Licht an monodispersen Kunststofflatices. I
- Chemistry
- 1963
Mit Hilfe von Durchsicht- und Reflexionsspektren werden die Farberscheinungen an monodispersen Latices als Bragg-Reflexe mit sichtbarem Licht identifiziert. Durch eine vollstandige Strukturanalyse…
The structure of opal and the origin of its iridescence
- Materials Science
- 1953
SummaryA study of the optical behaviour of iridescent opal indicates very clearly that the silica present in the material has a regularly stratified structure in which the alternate layers differ in…
Structure of Opal
- GeologyNature
- 1964
SINCE the work of Flörke1 it has generally been accepted that natural opaline silicas fall into two broad categories: (1) specimens which give X-ray patterns indicative of an obviously, although in…
The crystal structure of Tipula iridescent virus as determined by Bragg reflection of visible light.
- Materials Science, PhysicsBiochimica et biophysica acta
- 1959