Materials Literature
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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 (…
A novel method for the estimation of the background in a powder diffraction pattern has been developed using a robust Bayesian analysis. In formulating a probabilistic approach to background fitting, the diffraction peaks are considered to be nuisance data that must be taken into account. The underlying probability th…
This paper reports the results of experimental studies of the dynamics of particles in a dense quasi-two-dimensional colloidal liquid. We find that at high density, near close packing but still in the liquid phase, the spatial configurations of the particles in the colloidal liquid consist of small ordered domains sep…
We study the transmission properties of light through the symmetric Fibonacci-class $[\mathrm{SFC}(n)]$ quasiperiodic dielectric multilayers, which possess a mirror symmetry. For a normal incidence of light, many perfect transmission peaks (the transmission coefficients are unity) are numerically obtained. The transmi…
Field electron emission properties of aligned multi-walled carbon nanotube films were studied with variation of the vacuum gap d between anode and cathode. With d varying in the range of 0.4-2 mm, the emission current-gap voltage characteristics and the corresponding Fowler-Nordheim (FN) plots show distinct nonlineari…
We report on the first chemically prepared multilayer quantum well structure in a semiconductor quantum dot. By subsequent precipitation of HgS, CdS, HgS, and again CdS from aqueous solution, we obtained nanoparticles which contain two HgS quantum wells separated by a double layer of CdS. The core and the capping mate…
The crystal structure of anthranilate synthase (AS) from Serratia marcescens, a mesophilic bacterium, has been solved in the presence of its substrates, chorismate and glutamine, and one product, glutamate, at 1.95 A, and with its bound feedback inhibitor, tryptophan, at 2.4 A. In comparison with the AS structure from…
JANA is a computer program for the refinement and analysis of periodic and aperiodic (incommensurately modulated structures and composite crystals) crystal structures. Here a new module is introduced that allows Rietveld refinements against powder diffraction data. It is shown that JANA 2000 provides a state-of-the-ar…
Quantitative determination of phase abundance in a multicomponent polycrystalline mixture is a basic goal in materials characterization. Because of several advantages compared with traditional techniques, the Rietveld method has been increasingly applied to this task. Further progress in this direction would be to car…
The spin-crossover iron(II) complex [Fe(L)(CN)2]·H2O (1) has been investigated. Complex 1 has a pentagonal bipyramidal structure which is seven-coordinated, containing an N3O2 macrocycle and two CN- ligands. Water molecules bind the complex by means of hydrogen bonding. It was found that the complex 1 exhibited a ligh…
The positions of Bragg edges in neutron transmission experiments can be defined with high accuracy using the time-of-flight (TOF) technique on pulsed neutron sources. A new dedicated transmission instrument has been developed at ISIS, the UK spallation source, which provides a precision of Δ d / d ≃ 10 −5 in the deter…