Nitrogen-Vacancy Color Centers Created by Proton Implantation in a Diamond

We present an experimental study of the longitudinal and transverse relaxation of ensembles of negatively charged nitrogen-vacancy (NV−) centers in a diamond monocrystal prepared by 1.8 MeV proton implantation. The focused proton beam was used to introduce vacancies at a 20 µµm depth layer. Applied doses were in the range of 1.5×1013 to 1.5×1017 ions/cm2. The samples were subsequently annealed in vacuum which resulted in a migration of vacancies and their association with the nitrogen present in the diamond matrix. The proton implantation technique proved versatile to control production of nitrogen-vacancy color centers in thin films.

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Optical investigation of radiation-induced color centers in lithium fluoride thin films for low-energy proton-beam detectors

Optical Materials ◽

10.1016/j.optmat.2018.12.031 ◽

2019 ◽

Vol 88 ◽

pp. 580-585 ◽

Cited By ~ 1

Author(s):

Mauro Leoncini ◽

Maria Aurora Vincenti ◽

Francesca Bonfigli ◽

Stefano Libera ◽

Enrico Nichelatti ◽

...

Keyword(s):

Thin Films ◽

Proton Beam ◽

Lithium Fluoride ◽

Low Energy ◽

Color Centers ◽

Optical Investigation ◽

Energy Proton ◽

Radiation Induced

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EXPERIMENTAL STUDY OF THE IN-PLANE THERMAL CONDUCTIVITY ENHANCEMENT OF SUSPENDED GLASS THIN FILMS DUE TO LONG RANGE SURFACE PHONON-POLARITONS

10.1615/ihtc16.cip.023810 ◽

2018 ◽

Author(s):

Laurent Tranchant ◽

S. Hamamura ◽

Jose Ordonez-Miranda ◽

Sebastian Volz ◽

Koji Miyazaki

Keyword(s):

Thin Films ◽

Thermal Conductivity ◽

Experimental Study ◽

Long Range ◽

Thermal Conductivity Enhancement ◽

Conductivity Enhancement ◽

Surface Phonon ◽

Surface Phonon Polaritons ◽

Phonon Polaritons

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Experimental study of water droplet break up in water in oil dispersions using an apparatus that produces localized pressure drops

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles ◽

10.2516/ogst/2018079 ◽

2019 ◽

Vol 74 ◽

pp. 1 ◽

Cited By ~ 5

Author(s):

Fabricio S. Silva ◽

Ricardo A. Medronho ◽

Luiz Fernando Barca

Keyword(s):

Experimental Study ◽

Droplet Size Distribution ◽

Energy Dissipation Rate ◽

Experimental Results ◽

Good Prediction ◽

Pressure Drops ◽

Turbulence Suppression ◽

Kolmogorov Length Scale ◽

Control Production ◽

Break Up

Oil production facilities have choke/control valves to control production and protect downstream equipment against over pressurization. This process is responsible for droplets break up and the formation of emulsions which are difficult to treat. An experimental study of water in oil dispersion droplets break up in localized pressure drop is presented. To accomplish that, an apparatus simulating a gate valve was constructed. Droplet Size Distribution (DSD) was measured by laser light scattering. Oil physical properties were controlled and three different break up models were compared with the experimental results. All experimental maximum diameters (dmax) were above Kolmogorov length scale. The results show that dmax decreases with increase of energy dissipation rate (ε) according to the relation dmax ∝ ε−0.42. The Hinze (1955, AIChE J.1, 3, 289–295) model failed to predict the experimental results, although, it was able to adjust reasonably well those points when the original proportional constant was changed. It was observed that increasing the dispersed phase concentration increases dmax due to turbulence suppression and/or coalescence phenomenon. Turbulent viscous break up model gave fairly good prediction.

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