Materials Literature
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Abstract In this study it is shown that the antiferrodistortive phase transition in titanite, CaTiSiO In order to study the stepwise structural changes synchrotron radiation was used to collect X-ray diffraction data at 100 K, 295 K and 530 K on the 4-circle diffractometer at HASYLAB using a wavelength of 0.560(1) Å.…
Transfer of the recognition activity of a ferrocene ionophore to an electrode surface from the homogeneous phase has been successfully accomplished for the first time. The synthesis and electrochemical characterization of a new pyrrole‐substituted ferrocene crown ether are described, followed by the formation of the c…
Nanotubes of hexagonal boron nitride (h-BN) were discovered to be formed on amorphous boron (am-B) particles by annealing am-B in an h-BN crucible with metal Li. Furthermore, BN nanoballs of multi BN layers and a single BN layer were discovered.
The first hyperpolarizability, β, of one of the simplest heterocyclic pyridinium betaines, (1-pyridinio)benzimidazolate, was measured experimentally with the hyper-Rayleigh scattering technique and compared to the calculated values obtained by the semiempirical INDO/S and ab initio molecular orbital methods. Heterocyc…
Abstract Amino acids of differing hydrophobicity were tested as plasticizers in starch‐glycerol (4:1 weight ratio) blends and were compared to the more conventional plasticizers, urea, sucrose and ammonium chloride. In mechanical tests (tensile strength and percent elongation) on extruded ribbons containing up to 20 w…
A planar multi target sputtering approach was used to deposit self polarized PZT films on TiO2/Pt bottom electrodes for the use in thin film pyroelectric IR detector arrays. By using elevated substrate temperatures of about 450°C “in situ” growth of tetragonal PZT could be achieved. The films exhibited pyroelectric cu…
We present a generalization of dissipative particle dynamics that includes shear forces between particles. The new algorithm has the same structure as the (isothermal) smoothed particle dynamics algorithm, except that it conserves angular momentum and includes thermal fluctuations consistently with the principles of e…
Upon treating the corresponding oxalates with carbon disulfide (p CS2 =130 Torr) at a heating rate of 5 °C min -1 , it is shown that the cubic γ-phase of pure rare-earth sesquisulfides (γ-Ln 2 S 3 ) can be obtained at 800 °C from samarium to holmium (also yttrium) and at 1000 °C from neodymium to dysprosium. By workin…
Reaction of elemental manganese, antimony and selenium under mild solvothermal conditions yields the complex anion [Mn 4 (en) 9 (SbSe 4 ) 4 ] 4 - , the first example of a transition-metal complex with SbSe 4 3- anions acting as ligands; the anions are coordinated in a terminal position as well as a bridging ligand.
Hydrolysis and initial polycondensation processes in the Si(OEt) 4 (TEOS)–RSi(OEt) 3 –EtOH–water–HCl systems (R=Me, Ph) [TEOS:RSi(OEt) 3 :EtOH:water:HCl=1:1:24:x:y (x=12, 2/3; y=2×10 -3 , 4×10 -3 , 8×10 -2 )] have been investigated by using 29 Si NMR spectroscopy. For comparison, the alkoxysilanes [TEOS, MeSi(OEt) 3 (…
New cholesteric liquid crystals induced by intermolecular hydrogen bonding between 3-cholesteryloxycarbonylpropanoic acid (MCB) and 4-(4-alkoxybenzoyloxy)-4-stilbazoles (n SZ); between MCB and N -(4-pyridylmethylidiene)anilines (n -PMA) were prepared. Their liquid crystalline properties were investigated by DSC, polar…
A series of polythiaarene derivatives has been synthesised and their redox properties studied. The charge stabilizing effect of the aryl sulfide groups that surround the central aromatic core promotes nucleophilic substitution and markedly facilitates radical anion formation, leading to remarkably mild reduction poten…
In this, the last of three articles on the optical absorption of electrons in a half-filled Peierls-distorted chain, we address the dimerized extended Hubbard model in the limit of a large on-site interaction U. When the Hubbard interaction is large compared with both the bandwidth W and the nearest-neighbour interact…
The thermal behaviour in oxygen and the cation distribution of manganese iron spinels Mn 3-x Fe x O 4 (0≤x≤3) obtained by a soft chemistry method have been determined by thermogravimetry and IR spectroscopy . The existence of two different cation distributions as function of composition x is established from a quantit…
Three natural diamond detectors (NDD) based spectrometry systems have been developed and used on TFTR to perform D–T neutron spectrum and flux measurements. DT neutrons interact with the NDD through the 12C(n, alpha)9Be reaction to produce a narrow peak in the pulse height distribution which has 2%–3% energy resolutio…
Ruthenium porphyrins catalyse oxygen transfer from 2,6-dichloropyridine N-oxide to steroids with retention of configuration at the asymmetric centre, giving novel steroids.
The acidic hydrolysis of triethoxyvinylsilane Si(C 2 H 3 )(OEt) 3 led to octavinyloctasilasesquioxane (C 2 H 3 SiO 1.5 ) 8 1 and to a transparent derived gel 2. Compound 1 was obtained as single crystals, suitable for X-ray analysis: trigonal, space group R, Z = 3, a = 13.533(2), c = 14.222(2) Å, γ = 120°. Disorder of…
The synthesis and structural and electrochemical properties of an electron deficient iron μ-oxo porphyrin dimer, (μ-oxo)bis[(2,3,12,13-tetrabromo-5,10,15,20- tetraphenylporphyrinatoiron(III)), represented as [(TPPBr 4 )Fe] 2 O, are reported. X-ray analysis indicates an Fe−O−Fe angle of 177.9(5)° and an interplanar dis…
The translational and rotational dynamics, including the translational−rotational coupling, of collagen in an aqueous 0.25 mg/mL solution of 0.1 N HCl were studied by polarized dynamic light scattering. An autocorrelator with variably spaced delayed times allowed computation of dynamic light-scattering intensity autoc…
New high efficiency thermoelectric materials with ZT values substantially larger than 1.0 have been recently developed. The successful development of a segmented thermoelectric generator utilizing a combination of state-of-the-art thermoelectric materials and these novel thermoelectric materials could result in a high…