Search results for "Crystal"
showing 10 items of 22886 documents
Enhancing the luminescence efficiency of silicon-nanocrystals by interaction with H+ions
2018
The emission of silicon nanocrystals (Si-NCs), synthesized by pulsed laser ablation in water, was investigated on varying the pH of the solution. These samples emit μs decaying orange photoluminescence (PL) associated with radiative recombination of quantum-confined excitons. Time-resolved spectra reveal that both the PL intensity and the lifetime increase by a factor of ∼20 when the pH decreases from 10 to 1 thus indicating that the emission quantum efficiency increases by inhibiting nonradiative decay rates. Infrared (IR) absorption and electron paramagnetic resonance (EPR) experiments allow addressing the origin of defects on which the excitons nonradiatively recombine. The linear correl…
Synthesis and characterization of ethylene-1-hexene copolymers prepared by using MgCl2(THF)2-supported Ziegler-Natta catalysts
2000
Ethylene was copolymerized with 1-hexene over vanadium (VOCl3 and VCl4) and titanium (TiCl4) catalysts supported on MgCl2(THF)2 and activated with Et2AlCl. So far these catalyst systems have not been known as initiators of ethylene-1-hexene copolymerization. The vanadium catalysts were more active than the titanium catalyst and, at identical comonomer concentrations in the feed, gave rise to a greater incorporation of 1-hexene into the copolymer. Even at relatively low fractions of 1-hexene, the MgCl2(THF)2-supported catalysts affected much the copolymer properties like density, melting point and crystallinity.
Single π0 production off neutrons bound in deuteron with linearly polarized photons
2021
The quasifree γ→d→π0n(p) photon beam asymmetry, Σ, has been measured at photon energies, Eγ, from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI electron beam facility with the Crystal Ball and TAPS calorimeters covering pion center-of-mass angles from 49∘ to 148∘. In this kinematic region, polarization observables are sensitive to contributions from the Δ(1232) and N(1440) resonances. The extracted values of Σ have been compared to predictions based on partial-wave analyses (PWAs) of the existing pion photoproduction database. Our comparison includes the SAID, MAID and Bonn–Gatchina anal…
CCDC 1045982: Experimental Crystal Structure Determination
2015
Related Article: Michele Bedin, Alavi Karim, Marcus Reitti, Anna-Carin C. Carlsson, Filip Topić, Mario Cetina, Fangfang Pan, Vaclav Havel, Fatima Al-Ameri, Vladimir Sindelar, Kari Rissanen, Jürgen Gräfenstein, Máté Erdélyi|2015|Chemical Science|6|3746|doi:10.1039/C5SC01053E
CCDC 1917460: Experimental Crystal Structure Determination
2020
Related Article: A. Carel N. Kwamen, Marcel Schlottmann, David Van Craen, Elisabeth Isaak, Julia Baums, Li Shen, Ali Massomi, Christoph Räuber, Benjamin P. Joseph, Gerhard Raabe, Christian Göb, Iris M. Oppel, Rakesh Puttreddy, Jas S. Ward, Kari Rissanen, Roland Fröhlich, Markus Albrecht|2020|Chem.-Eur.J.|26|1396|doi:10.1002/chem.201904639
CCDC 257790: Experimental Crystal Structure Determination
2005
Related Article: R.H.Laye, F.K.Larsen, J.Overgaard, C.A.Muryn, E.J.L.McInnes, E.Rentschler, V.Sanchez, S.J.Teat, H.U.Gudel, O.Waldmann, G.A.Timco, R.E.P.Winpenny|2005|Chem.Commun.||1125|doi:10.1039/b416770h
CCDC 992678: Experimental Crystal Structure Determination
2014
Related Article: Francisco R. Fortea-Pérez, Nadia Marino, Donatella Armentano, Giovanni De Munno, Miguel Julve, Salah-Eddine Stiriba|2014|CrystEngComm|16|6971|doi:10.1039/C4CE00669K
CCDC 2069070: Experimental Crystal Structure Determination
2021
Related Article: Borja Rodríguez-Barea, Júlia Mayans, Renato Rabelo, Adrián Sanchis-Perucho, Nicolás Moliner, José Martínez-Lillo, Miguel Julve, Francesc Lloret, Rafael Ruiz-García, Joan Cano|2021|Inorg.Chem.|60|12719|doi:10.1021/acs.inorgchem.1c01905
CCDC 1022517: Experimental Crystal Structure Determination
2015
Related Article: Khaleel I. Assaf, Merve S. Ural, Fangfang Pan, Tony Georgiev, Svetlana Simova, Kari Rissanen, Detlef Gabel, Werner M. Nau|2015|Angew.Chem.,Int.Ed.|54|6852|doi:10.1002/anie.201412485
CCDC 1814349: Experimental Crystal Structure Determination
2018
Related Article: Raminder S. Mulla, Marikka S. Beecroft, Robert Pal, Juan A. Aguilar, Javier Pitarch‐Jarque, Enrique García‐España, Elena Lurie‐Luke, Gary J. Sharples, J. A. Gareth Williams|2018|Chem.-Eur.J.|24|7137|doi:10.1002/chem.201800026