Materials Literature
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The design of artificial models of the processes of biomineralization has resulted in the union of inorganic materials research and supramolecular organic chemistry. Recent work in this field of bioinspired synthesis of composite organic/inorganic materials is reviewed and prospects for the future are discussed. Atten…
A two-sublattice peudospin model with distance-dependent interaction parameters is constructed for the ferroelectric phase transition at 307 K and for the isomorphous anomaly at 180 K in pentakis (methylammonium) undecachlorodibismuthate (III) $({\mathrm{CH}}_{3}{\mathrm{NH}}_{3}{)}_{5}{\mathrm{Bi}}_{2}{\mathrm{Cl}}_{…
Two series of trends in negative pressure with cavitation in water were observed by the Berthelot method using single- and poly-crystalline molybdenum tubes sealed with single-crystalline copper plugs by repeating runs of temperature cycles at rates of 70-100 cycles/day between 50 and 98 °C, where a run means successi…
Using X-ray data, the determination of the cation distribution in crystals becomes problematic as a result of parameter correlations in the structure refinements. To circumvent the problem, a new refinement strategy (LOT analysis) was proposed by Kroll et al. [ Eur. J. Mineral. (1997), pp. 705–734] and successfully ap…
The first off-resonance hyperpolarizabilities (β(0)) of bisubstituted carotenoids are computed and analyzed using a quasiparticle, collective electronic oscillators (CEO) representation. The few oscillators which dominate the response are identified by solving the time dependent Hartree−Fock equations for the reduced…
The crystal structure of hexagonal ErMnO3, erbium manganese trioxide, has been determined at room temperature. It is isomorphous with YMnO3. Although we observed inversion twinning, similar to YMnO3, the twin fractions do not have a 1:1 ratio, and the crystals are expected to show net ferroelectricity.
Abstract The heat capacity of poly[carbonyl(ethylene‐ co ‐propylene)] with 95 mol % C 2 H 4 CO (Carilon EP®) was measured with standard differential scanning calorimetry (DSC) and temperature‐modulated DSC (TMDSC). The integral functions of enthalpy, entropy, and free enthalpy were derived. With quasi‐isothermal TMD…
We report extensive simulations of liquid supercooled states for a simple three-site molecular model, introduced by Lewis and Wahnström [Phys. Rev. E 50, 3865 (1994)] to mimic the behavior of orthoterphenyl. The large system size and the long simulation length allow us to calculate very precisely (in a large q-vector…
Ultrafine ${\mathrm{Pt}}_{x}{\mathrm{Ru}}_{1\ensuremath{-}x}$ particles (with $0<~x<~1),$ synthesized by decomposition of organometallic precursors in the presence of a stabilizing polymer, are studied using both high-resolution transmission electron microscopy and wide-angle x-ray scattering techniques. In this…
The molecular motions in d -sorbitol ( d -glucitol) have been studied by thermally stimulated depolarization currents (TSDC) in the temperature region between −160 and 10 °C. The β relaxation appears as a broad global peak between −160 and −50 °C and its features were compared with those of the β relaxation of maltito…
A fluid mixture of hard discs is made glassy in a molecular dynamics experiment by permanently constraining each disc center to stay within a cage of three near neighbors. The constraints can be applied at any density and they cause a thermodynamic glass transition where the compressibility, heat capacity, and entropy…
Abstract The miscibility, crystallization, vitrification, and melting behavior of multiblock copolymers consisting of alternating components of oligo[imino(1‐oxododecamethylene)] and oligo(oxytetramethylene) were investigated in their dependence of composition and molecular mass of the blocks. In all compositions stud…
From temperature studies at ambient pressure, it was pointed out for several glass-forming liquids that the alpha-relaxation time (tau) can be related to the dc-ionic conductivity (sigma) through the phenomenological fractional Debye-Stokes-Einstein (DSE) equation. In the present paper we test the validity of fraction…
Hydrogenated diamond-like carbon (DLC) films have been deposited on silicon substrates from dielectric barrier discharge (DBD) plasmas of CH 4 at room temperature under a pressure of 0.4-4.0 Torr. The effects of discharge gas pressure ( P ), the applied peak voltage and the distance of the discharge gas spacing ( d )…
A study of the electrical conductivity of polypyrrole-polyoxyphenylene composites (PPy-POP and PPy-POP-MPcTS) prepared by in situ electropolymerization is presented, where MPcTS stands for tetrasulfonated tetrasodium metallophthalocyanine salts and is used as a second dopand for polypyrrole. The conductivity is studie…
The growth dynamics, stabilities, and structures of small zirconium oxide clusters (ZrnOm) are studied by covariance mapping time-of-flight mass spectrometry and density functional theory calculations. The zirconium oxide clusters are produced by laser ablation of zirconium metal into a helium gas flow seeded with up…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTInteractions of Anionic Carboranylated Porphyrins with DNARosaria Lauceri, Roberto Purrello, Shankar J. Shetty, and M. Graça H. VicenteView Author Information Istituto per lo Studio delle Sostanze Naturali di Interesse Alimentare e Chimico Farmaceutico C.N.R., Catania,…
High-resolution Brillouin light scattering is used to measure the dynamic structure factor of the fragile glass former orthoterphenyl (OTP) in a wide temperature range around the glass transition region and up to the boiling point. The whole set of spectra is described in terms of a phenomenological generalized hydrod…
Iron(II) complexes exhibiting thermal spin-crossover may be converted from the 1 A 1 low-spin (LS) state to the 5 T 2 high-spin (HS) state by irradiation with green light (light-induced excited spin-state trapping, LIESST) and from the LS to the HS state by irradiation with red light (reverse LIESST). The lifetime of…
Tellurite based oxyfluoride glass, [70 mol% TeO 2 , 30 mol% LiF] 0.9 /[LnO] 0.1 where Ln = Pr 3+ , Nd 3+ , Er 3+ and Eu 3+ ions, were prepared. The Judd-Ofelt parameters Ω λ (λ = 2, 4, 6) and radiative parameters, viz, the total radiative transition probability ( A T ), radiative lifetimes (τ R ) the branching ratio (…