Materials Literature
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On short time scales an underlying Arrhenius temperature dependence of the diffusion constant can be extracted from the fragile, super-Arrhenius diffusion of a binary Lennard-Jones mixture. This Arrhenius diffusion is related to the true super-Arrhenius behavior by a factor that depends on the average angle between st…
The mutual transposition of the core and the shell of a Au@Pt core-shell nanosphere has been obtained by employing picosecond laser pulses to excite the surface-plasmon resonances of platinum. The thermalized energy of the plasmon resonances makes the core metal of the gold melt earlier than the shell metal of platinu…
Abstract Summary: Novel optically transparent and highly organosoluble alicyclic polyimides derived from bulky alicyclic diamine containing trifluoromethyl group on either side, 1,1‐bis[4‐(2‐trifluoromethyl‐4‐aminophenoxy)phenyl]‐4‐ tert ‐butylcyclohexane (BTFAPBC) , were prepared. All polymers showed excellent solubi…
A new perovskite, Na[Cu(2.5)Ti(0.5)]Ti4O12, has been synthesized using a conventional solid-state technique. Neutron and synchrotron X-ray powder diffraction studies in combination with density measurements and bond-valence calculations have revealed that the material crystallizes in the cubic Im space group (a = 7.38…
Growth of single crystals of the title compound Sr(C4H4O5).3H2O is achieved using the gel diffusion technique. Multifaceted single crystals of size up to 4x3x3 mm3 are obtained. X-Ray Diffraction (XRD) pattern of the grown crystal and the Fourier Transform Infra-Red (FTIR) spectrum in the range 400-4000 cm-1 are recor…
To prove that a tensile effect operated in pores due to a concave meniscus of a capillary-condensed liquid, we measured the X-ray diffraction pattern of capillary-condensed Kr in the spherical cavities of KIT-5 ordered mesoporous silica at three temperatures of 90, 92, and 94 K when the vapor pressure was successively…
Cupric oxide CuO (tenorite) is examined computationally by employing the local density approximation (LDA) method including on-site Coulomb-interaction. The geometry of the antiferromagnetic (AF) unit cell was optimized to obtain a correctly equilibrated crystallographic structure. AF ordering and the band gap are fou…
Abstract Summary: A soluble, regular, ethoxy‐capped, ladder poly(silsesquioxane) ( EtO‐LPOAS ) has been successfully synthesized by means of the concerted H‐bonding template of silanol and amido groups, through a new template monomer M : tetraethoxy disiloxane bisamide compound. EtO‐LPOAS was characterized by X‐ray di…
This is the first of a series of works on the continuum mechanics and thermodynamics of creep and recrystallization of large polycrystalline masses. The general continuum theory presented here is suited to mono- and multi-mineral rocks. It encompasses several symmetry groups (e.g. orthotropic and transversely isotropi…
Potassium hydrogen phthalate (KAP) single crystals were grown by slow evaporation and slow cooling techniques. The growth procedure like temperature cooling rate, evaporation rate, solution pH, concentration of the solute, supersaturation ratio etc., has been varied to have optically transparent crystals. Efforts were…
In recent years considerable effort has gone into the preparation and characterisation of high purity anthracene crystals, since anthracene is used as a model organic molecular crystal in studies of solid-state properties. Studies of organic molecular crystals and their applications in optics and electronics have been…
Abstract Summary: The synthesis of new fluorene containing photocrosslinkable reactive mesogens is described. Both monodisperse trimers or pentamers and oligomeric mixtures containing two photocrosslinkable acrylate end groups were obtained by Suzuki‐cross‐coupling reactions. The pentamer 12a shows an ideal phase beha…
Three clusters [Ag11(mu9-Se)(mu3-I)3{Se2P(OR)2}6] (R = Et, 1; iPr, 2; 2Bu, 3) were isolated from the reaction of [Ag(CH3CN)4](PF6), NH4[Se2P(OR)2], and Bu4NI in a molar ratio of 4:3:1 in CH2Cl2 in 47-55% yield. Compounds 1 and 2 can also be synthesized with high yield from the reaction of Ag10(Se)[Se2P(OR)2]8 with 8 e…
Ru films were sputter deposited on native oxide p-Si(100) substrates under normal incidence and oblique angle incidence with and without substrate rotation. We characterized the crystalline texture and morphology of the Ru films by x-ray diffraction, transmission electron microscopy, and scanning electron microscopy.…
Diamond films are prepared by microwave plasma-enhanced chemical-vapor deposition on Si (100) substrates using the H2–Ar–CH4 gases. Raman scattering data, including the peak position, intensity, area, and width, are analyzed in depth and used to obtain the sp3- and sp2-bonded carbon contents and the nature of internal…
Here we report the phase behavior of poly(9,9-di-n-hexyl-2,7-fluorene) (PFH), which previously received little attention as compared to its homologues poly(9,9-di-n-octyl-2,7-fluorene) (PFO) and poly(9,9-di-(2'-ethylhexyl)-2,7-fluorene) (PFEH). By means of differential scanning calorimetry, X-ray diffraction, and elec…
The crystal growth and kinetics of the formation of [Co(C 6 H 18 N 4 )][Sb 2 S 4 ] were investigated under solvothermal conditions with combined in situ EDXRD (energy dispersive X-ray diffraction) and in situ EXAFS (extended X-ray absorption fine structure) at different temperatures. In the overwhelming number of reac…
The stable structures, energies, and electronic properties of neutral, cationic, and anionic clusters of Al(n) (n = 2-10) are studied systematically at the B3LYP/6-311G(2d) level. We find that our optimized structures of Al5(+), Al9(+), Al9(-), Al10, Al10(+), and Al10(-) clusters are more stable than the corresponding…
The structure and biochemical function of the hot dog-fold thioesterase PaaI operative in the aerobic phenylacetate degradation pathway are examined. PaaI showed modest activity with phenylacetyl-coenzyme A, suggestive of a role in coenzyme A release from this pathway intermediate in the event of limiting downstream p…
The morphological development of sheared isotactic polypropylene (iPP) containing different amounts of sodium benzoate (SB) has been investigated using wide- and small-angle X-ray scattering techniques. The microbeam of synchrotron radiation allows us to gain, precisely and efficiently, the local morphology at a given…