3,213 research outputs found
Spherical nanometer-sized diamond obtained from detonation
No full textUltrafine diamond (UFD) was synthesized under high pressure and high temperatures generated by explosive detonation. The structure, composition, surface and thermal stability of UFD were studied by use of XRD, TEM, Raman Spectroscopy, FTIR, etc. The influences of the synthesis conditions and purification conditions on the properties of UFD were analyzed. The UFD had an average size of 4-6 nm, commonly exhibiting a spherical shape. The highest yield was of up to 10 mass% of the explosive. Attempts were made to use UFD as an additive to metal-diamond sintering and as crystallite seeds of CVD diamond films. The results show that UFD can decrease the coefficient of friction of the composite by 30%, and raise the nucleation density in CVD diamond films by 2-3 times
The Story of the Fallen Cone
No full textThe output is a collection of eight prints (each 20 x 30cm), which is the outcome of practice-based research into printmaking processes – particularly etching – and expanding the potential of children’s book illustration by combining etching with colour. The output expands traditional printmaking methods and materials, in particular dry point etching. Everitt was keen to retain drawing through etching as the primary mode for children’s book illustration. The research was conducted over a period of nine months between January and September 2017. The prints combine multiple techniques, including drypoint etching, monoprint, watercolour and drawing. They were made to accompany a short story for children that was written by the New Zealand author Vibhusha Delamore. Titled The Story of the Fallen Cone, this story is aimed at young children (ages 3 to 7) and tells of a pinecone who encounters various animals within a forest, including a crow, a small bug and a hedgehog, and reflects on the meaning of its life through these interactions. The story explores aspects of ecology, origin, growth, nature and life cycles, identity, belonging and interpersonal relations
Diamond Dick's man-hunt; or, The terror of the Yellowstone / by the author of "Diamond Dick."
No full textDiamond Dick's stand-off; or, The shotgun messenger's last trip / by the author of "Diamond Dick."
No full textDiamond Dick's lost trail; or, A queer hunt in Oregon / by the author of "Diamond Dick."
No full textDiamond Dick's maverick; or, The secret of Old Copper-Top / by the author of "Diamond Dick."
No full textDiamond Dick's fight for honor; or, The wizard gambler / by the author of "Diamond Dick."
No full textTemplate-assisted bottom-up growth of nanocrystalline diamond micropillar arrays
No full text Micro-patterned diamond has been investigated for numerous applications, such as biomimetic surfaces, electrodes for cell stimulation and energy storage, photonic structures, imprint lithography, and others. Controlled patterning of diamond substrates and moulds typically requires lithography-based top-down processing, which is costly and complex. In this work, we introduce an alternative, cleanroom-free approach consisting of the bottom-up growth of nanocrystalline diamond (NCD) micropillar arrays by chemical vapour deposition (CVD) using a commercial porous Si membrane as a template. Conformal pillars of ~4.7 μm in height and ~2.2 μm in width were achieved after a maximum growth time of 9 h by hot-filament CVD (2% CH 4 in H 2 , 725 °C at 10 mbar). In order to demonstrate one of many possible applications, micropillar arrays grown for 6 h, with ~2 μm in height, were evaluated as moulds for imprint lithography by replication onto hard cyclic olefin copolymer (COC) and onto soft polydimethylsiloxane (PDMS) elastomer. The results showed preserved mechanical integrity of the diamond moulds after replication, as well as full pattern transfer onto the two polymers, with matching dimensions between the grown pillars and the replicated holes. Prior surface treatment of the diamond mould was not required for releasing the PDMS replica, whereas the functionalisation of the diamond surface with a perfluorododecyltrichlorosilane (FDDTS) anti-stiction layer was necessary for the successful release of the COC replica from the mould. In summary, this paper presents an alternative and facile route for the fabrication of diamond micropillar arrays and functional micro-textured surfaces. Micro and Nano Engineerin
Suspended Waveguide for Mechanical Driving of Color Centers in Diamond
No full textWe demonstrate the transmission of a ∼4-GHz surface acoustic wave across a suspended diamond waveguide. This enables simultaneous coherent mechanical driving of, and optical access to, diamond-based color centers.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.QID/Taminiau La
Diamond Dick's dark case; or, The spell of the "Loco-Loco" / by the author of "Diamond Dick."
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