Results 261 to 270 of about 458,908 (294)

Spherical Colloidal Photonic Crystals

Accounts of Chemical Research, 2014
CONSPECTUS: Colloidal photonic crystals (PhCs), periodically arranged monodisperse nanoparticles, have emerged as one of the most promising materials for light manipulation because of their photonic band gaps (PBGs), which affect photons in a manner similar to the effect of semiconductor energy band gaps on electrons. The PBGs arise due to the periodic
Yuanjin, Zhao, Luoran, Shang, Yao, Cheng, Zhongze, Gu   +3 more
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Spherical crystals

Journal de Physique IV, 2002
The structure of condensed matter order may change when the medium is curved. This is illustrated for the case of spherical crystals formed by self-assembled colloidal beads on water droplets in oil. Beyond a minimum crystal size novel grain boundary scars proliferate in the ground state.
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A spherical crystal imager for OMEGA EP

Review of Scientific Instruments, 2012
A narrowband x ray imager for the Cu Kα line at ∼8 keV using a spherically bent quartz crystal has been implemented on the OMEGA EP laser at the University of Rochester. The quartz crystal is cut along the 2131 (211) planes for a 2d spacing of 0.3082 nm, resulting in a Bragg angle of 88.7°, very close to normal incidence.
C, Stoeckl, G, Fiksel, D, Guy, C, Mileham, P M, Nilson, T C, Sangster, M J, Shoup, W, Theobald   +7 more
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Preparation of Spherically Agglomerated Crystals of Aminophylline

Journal of Pharmaceutical Sciences, 1984
The spherically agglomerated crystals of aminophylline (theophylline-ethylenediamine complex) can be compounded directly into pharmaceutical formulations without further processing, e.g., granulation. Such crystals were prepared by mixing theophylline and ethylenediamine in a partially miscible solvent system, i.e., organic solvent-ethanol-water.
Y, Kawashima, S, Aoki, H, Takenaka, Y, Miyake   +3 more
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Improved compression properties of propyphenazone spherical crystals

International Journal of Pharmaceutics, 2000
Spherical propyphenazone crystals were produced by an agglomeration technique using a three solvents system. After selecting the best propyphenazone solvent (ethyl alcohol), non-solvent (demineralized water) and bridging liquid (isopropyl acetate), several of their ratios were tested by a Sheffé ternary diagram.
DI MARTINO, Piera, Roberta Di Cristofaro, Christine Barthélémy, Etienne Joiris, PALMIERI, Giovanni Filippo, Sante Martelli   +5 more
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A note on the dissolution of spherical crystals

Proceedings of the Royal Society of Edinburgh: Section A Mathematics, 2001
We consider here the radial Stefan problem with Gibbs–Thomson law, which is a classical model describing growth or melting of a spherical crystal in a surrounding liquid. We shall specialize to the cases of two and three space dimensions and discuss the asymptotic behaviour of a melting crystal near its dissolution time t* > 0.
Herraiz, Luis A., Herrero, Miguel A., Velázquez, Juan J. L.   +2 more
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Spherical crystal cosmic X-ray spectrometer

Space Science Reviews, 1981
Free-standing, concentrating, Bragg crystal spectrometers offer the most practical way to achieve adequate sensitivity for high resolution studies of cosmic x-ray sources in the energy range ~ 500 eV to 104 eV. Such an instrument can provide either crystal limited resolution for a point source or nearly stigmatic imaging of an extended source without ...
H. W. Schnopper, L. Koch, M. Cantin, B. Mougin, R. Racchia, R. F. Berthelsdorf, J. L. Culhane   +6 more
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Of spherical cows, cloudy crystal balls, and proteins

Biochemical and Biophysical Research Communications, 2003
Although proteins perform a vast multitude of tasks in living organisms, perhaps the most fascinating and least well understood is the nanoengine aspect of protein action, where chemical energy is turned into mechanical motion. In order for this to happen a protein must change chemical bond energy into physical displacement via some sort of a ...
Robert H, Austin, Shirley Suiling, Chan
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Concept of Spherical Crystallization

2019
In this Chapter we describe how the concept of “spherical crystallization” was found based on the findings by Stock that ultrafine particles of barium sulfate can be spherically self-organized as an agglomerate in benzene under stirring. It was shown that the spherical agglomerate was not formed in absolutely dried benzene, suggesting that a small ...
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Structure of spherical three-dimensional Coulomb crystals

Physical Review E, 2005
An analysis of the structural properties of three-dimensional Coulomb clusters confined in a spherical parabolic trap is presented. Based on extensive high-accuracy computer simulations the shell configurations and energies for particle numbers in the range 60 < or = N < or = 160 are reported.
P, Ludwig, S, Kosse, M, Bonitz
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