Materials Literature
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Synthesis of azide complexes with the copper(II) macrocycle complex Cu(14ane)(2+) (where 14ane = 1,4,8,11-tetraazacyclothetradecane) has yielded two compounds. Cu(14ane)Cu(N(3))(4) contains micro(1,3)-azido bridged chains of Cu(14ane)(2+) cations and Cu(N(3))(4)(2)(-) anions. Magnetic studies reveal the presence of fe…
Low-energy coherent charge-density wave excitations are investigated in blue bronze (K(0.3)MoO(3)) and red bronze (K(0.33)MoO(3)) by femtosecond pump-probe spectroscopy. A linear gapless, acousticlike dispersion relation is observed for the transverse phasons with a pronounced anisotropy in K(0.33)MoO(3). The amplitud…
Abstract The dynamic vulcanization process, usually used for the preparation of thermoplastic elastomers, was used to prepare polypropylene (PP)/epoxy blends. The blends had crosslinked epoxy resin particles finely dispersed in the PP matrix, and they were called dynamically cured PP/epoxy blends. Maleic anhydride gra…
Perovskite single phased PbTiO3 thin films have been grown by pulsed-laser deposition on (100) MgO single crystals in order to prepare high quality optical waveguides. The substrate temperature and the oxygen pressure during the deposition have been optimized to improve crystalline quality and to grow epitaxial thin f…
A series of mesostructured Cu-SiO2 composites have been synthesized with sodium metasilicate (Na2SiO3) and cuprammonia nitrate (Cu(NH3)4(NO3)2) respectively used as Si and Cu sources. The synthetic procedures were conducted at room temperature, and cetyltrimethylammonia bromide was used as a template. Under our experi…
When an ultrasonic wave is applied to a nematic liquid-crystal cell, the molecules change their orientation, leading to a change in the optical intensity transmitted through the cell. Modeling this acousto-optic effect involves three separate theoretical issues: (a) calculating the intensity of sound transmitted throu…
Simulation models, based on an ionic description of closed-shell species and which incorporate many-body polarization effects, are derived for both yttrium and lanthanum aluminates using physically transparent mixing and scaling arguments. Three compositions $(20%{\mathrm{Y}}_{2}{\mathrm{O}}_{3}/80%{\mathrm{Al}}_{2}{\…
Nucleation and metastability of the eflucimibe ( S )-2‘,3‘,5‘-trimethyl-4‘-hydroxy-dodecylthiophenyl-acetanilide, a new acyl-coenzyme A:cholesterol O -acyltransferase (ACAT) inhibitor, have been investigated according to a polythermal method. Eflucimibe exhibits two polymorphs, A and B, which crystallize simultaneousl…
Spectroscopic analysis and atomic force microscopy (AFM) phase imaging studies show self-assembly of phenosafranin (PSF) to multiwalled carbon nanotubes (MWNTs). The shift in absorption spectra is associated with charge transfer of valence electrons from PSF to electron accepting sites on the MWNTs. The Raman-active d…
Several ferrocenyl-aryl-acetylenic compounds were synthesized and thermally converted in situ to carbon nanotube−Fe nanoparticle compositions. Upon melting, the ferrocenyl compounds are cured to a shaped configuration through the acetylenic units. Further heating of the polymeric composition results in the decompositi…
Using density-functional molecular dynamics simulations, we analyze the broken chemical order in a ${\mathrm{GeS}}_{2}$ glass and its impact on the dynamical properties of the glass through the in-depth study of the vibrational eigenvectors. We find homopolar bonds and the frequencies of the corresponding modes are in…
The preparation, spectroscopic characterization, and magnetic study of three new oxamidate-bridged nickel(II) dinuclear complexes of formulas ([Ni(Me3[12]aneN3)]2(mu-oa))(PF6)2 (1), ([Ni(Me3[12]aneN3)]2(mu-dmoa))(PF6)2 (2), and ([Ni(Me3[12]aneN3)]2(mu-dpoa))(PF6)2 (3) (Me3[12]aneN3 = 2,4,4-trimethyl-1,5,9-triazacyclod…
An intense green upconversion emission due to a photon avalanche mechanism has been observed in Ho3+–Yb3+ codoped fluroindate glasses, measured at 200 K, under excitation at around 750 nm. The influence of the Yb3+ concentration on the photon avalanche process has been studied. The pump power threshold of the avalanch…
Cyclic peptides with alternating d- and l-amino acid residues containing tert-leucine residues in every second position can form peptide nanotubes only when both enantiomers of the peptide are present in the solution. These results strongly indicate the formation of peptide nanotubes that assemble with one enantiomer…
In this article we present an alternative approach for the fabrication of silicon nanocrystals (Si–nc) prepared ex situ of the silicon dioxide (SiO2) host matrix. The Si–nc are scratched from porous silicon layers and incorporated into a host spin-on-glass SiO2 based matrix. High-resolution transmission electron micro…
Controlled grafting of polybetaine brushes onto hydrogen-terminated Si(100) substrates (Si−H substrates) was carried out via surface-initiated reversible addition−fragmentation chain-transfer (RAFT) polymerization. The azo initiator was immobilized on the Si−H surface through a three-step process: (i) coupling of an ω…
A fluid of hard spherocylinders of length-to-breadth ratio L/D=5 confined between two identical planar, parallel walls--forming a pore of slit geometry--has been studied using a version of the Onsager density-functional theory. The walls impose an exclusion boundary condition over the particle's centers of mass, while…
The electron spin polarization associated with electronic relaxation in molecules with trip-quartet and trip-doublet excited states is calculated. Such molecules typically relax to the lowest trip-quartet state via intersystem crossing from the trip doublet, and it is shown that when spin-orbit coupling provides the m…
Large-scale Y2O3:Eu nanotubes have been successfully fabricated by an improved sol–gel method within the nanochannels of porous anodic alumina templates. In this method, yttrium nitrate, europium nitrate and urea were used as precursors, yttrium nitrate and europium nitrate were acting as sources of europium and yttri…
The temperature dependence of the current conduction mechanisms in Au/Pb(Zr0.53,Ti0.47)O3/Pt (Au/PZT/Pt) metal–insulator–metal thin-film capacitors was investigated. The dominant current conduction mechanism from 300 to 375 K is space-charge-limited current (SCLC) due to holes and changes to Schottky emission in the t…