Two-Level Models for the Two-Step Spin Crossovers
We discuss here the physical bases of discrete models for the spin crossover systems, and we consider specifically the case of two sublattices which reproduces the so-called two-step transitions.
Materials Literature
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Determination of the distribution of chromium oxidation states in reduced Cr/Al2O3 catalysts from XPS by factor analysis and curve fitting
Abstract Principal component analysis (PCA) and target testing (TT) were performed on a series of reduced 2.5 wt.% Cr/Al 2 O 3 catalysts to determine the number, positions, shapes and relative spectral compositions (i.e. Cr oxidation states) in Cr 2p spectra as monitored by ESCA. The results from PCA indicated the pre…
Spectroscopic studies on the effect of field strength upon the curie transition of a VDF/TrFE copolymer
Abstract Infrared spectroscopic studies of the effects of field strength upon the ferroelectric phase transition behavior of a VDF/TrFE (75/25) copolymer upon heating and cooling in an electric field have revealed new findings. The paraelectric phase in the absence of an electric field resembles the α phase of PVDF wi…
Electron Impact Broadening Parameters Predictions from Regularities: Fe i, Fe ii, Fe iii, Fe iv, C iv, and SI IV
Trends in electron impact broadening and shift within spectral series are assessed using various theoretical calculations for Li I, Na I, C IV, and Si IV. Facile predictions, based on use of upper state ionization potential as the appropriate variable for representing atomic structure (Purić et al. 1991), are used to…
Resolution correction for surface X-ray diffraction at high beam exit angles
Owing to the two-dimensional periodicity of a superstructure on the crystal surface, the intensity in reciprocal space is continuously distributed along rods normal to the sample surface. The analysis of rod scans in surface X-ray diffraction provides information about the structure parameters normal to the sample sur…
Development of properties within particles of active carbons obtained by a steam activation process
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDevelopment of properties within particles of active carbons obtained by a steam activation processBronislaw BuczekCite this: Langmuir 1993, 9, 10, 2509–2512Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 October 1993…
A study of pressure pulses generated by travelling bubble cavitation
The collapse process of single bubbles in travelling bubble cavitation around two axisymmetric headforms have been studied acoustically to understand the collapse process of a cavitation bubble and characterize the sound emission in travelling bubble cavitation. The bubbles were observed to collapse and then sometimes…
Characterization of a highly photoactive molecular semiconductor: oxotitanium phthalocyanine
peer reviewed
Universality of the Hall-effect anisotropy in decagonal quasicrystals
Careful studies on single decagonal quasicrystals show that the anisotropy of the Hall coefficient ${\mathit{R}}_{\mathit{H}}$ is quite universal for these structures. ${\mathit{R}}_{\mathit{H}}$ changes sign when the magnetic field rotates by 90\ifmmode^\circ\else\textdegree\fi{} from the tenfold axis. In both cases,…
2-D Imaging of Fuel Vapor Concentration in a Diesel Spray via Exciplex-Based Fluorescence Technique
<div class="htmlview paragraph">To measure the fuel vapor concentration in an unsteady evaporating spray injected into nitrogen atmosphere, the exciplex-forming method, which produces spectrally separated fluorescence from the liquid and vapor phase, was applied in this study. Two experiments were conducted to i…
Electron transfer reactions at CdS semiconductor cluster interfaces. Adsorption and microenvironment effects on oxidative reactions
CdS clusters in the quantized size regime (≈ 30 Å radius) have been synthesized in several media, including homogeneous organic solution, reverse micelles, and polymers (carboxymethylamylose). Particle size is controlled by the medium, but the photophysical properties of the clusters, as prepared, do not depend strong…
Flexibility of a new thermoplastic polyimide studied with molecular simulations
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlexibility of a new thermoplastic polyimide studied with molecular simulationsRenshi Zhang and Wayne L. MatticeCite this: Macromolecules 1993, 26, 22, 6100–6105Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 October…
Vanadate Hot Corrosion Behavior of India, Yttria‐Stabilized Zirconia
Powders of In 2 O 3 –Y 2 O 3 “dual stabilized”ZrO 2 (IYSZ) were prepared using sol‐gel procedures and tested for resistance to destabilization by molten NaVO 3 at 700° and 900°C. IYSZ powders with stabilizer oxide compositions ranging from 100% down to about 50% In 2 O 3 were superior to 100%‐Y 2 O 3 ‐stabilized ZrO 2…
Electrochemical Studies of the Mechanism of the Formation of Metal‐TCNQ Charge‐Transfer Complex Film
Switching and memory storage thin films constructed from metallorganic charge‐transfer complexes, such as Cu + TCNQ − , can be prepared by reacting metals directly with organic acceptors in an acetonitrile solution. SEM and electrochemical methods were used to study the formation process of Cu + TCNQ − films on Cu sub…
The stability diagram of a nematic liquid crystal confined to a cylindrical cavity
Different nematic structures confined to a long cylindrical cavity with homeotropic surface anchoring are studied using a numerical minimization of the free energy of the uniaxial nematic liquid crystal. The stability of escaped radial structures and planar polar structures (with and without line defects) is analysed…
Development of a Constitutive Theory for Short Fiber Yams
This article deals with the effects of fiber orientation and bending deformation on staple yarn behavior. First, the effect of fiber orientation is shown by comparing yarn properties determined using three different fiber orientation cases. Then, for a given fiber orientation distribution, radial distributions of both…
Transition state stabilization by chloramphenicol acetyltransferase. Role of a water molecule bound to threonine 174.
The structure of the type III variant of chloramphenicol acetyltransferase reveals that Thr-174, a conserved residue, is hydrogen-bonded to a bound water molecule (water 252). Modeling studies (P. C. E. Moody and A. G. W. Leslie, unpublished data) suggested that water 252 could play a part in transition state stabiliz…
Cobalt complexes of octaethyloxophlorin. Metal-centered redox chemistry in the presence of a redox-active ligand
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCobalt complexes of octaethyloxophlorin. Metal-centered redox chemistry in the presence of a redox-active ligandAlan L. Balch, Marinella Mazzanti, and Marilyn M. OlmsteadCite this: Inorg. Chem. 1993, 32, 22, 4737–4744Publication Date (Print):October 1, 1993Publication Histor…
Detection of nematic-smectic phase transition in a semiflexible main-chain liquid crystalline polymer
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetection of nematic-smectic phase transition in a semiflexible main-chain liquid crystalline polymerS. D. Hudson, A. J. Lovinger, R. G. Larson, D. D. Davis, R. O. Garay, and K. FujishiroCite this: Macromolecules 1993, 26, 21, 5643–5650Publication Date (Print):October 1, 199…
Fluctuations in the ferrielectric smectic-Cγ* phase as observed by laser beam diffraction and photon correlation spectroscopy
We have studied the ferrielectric SmCγ* phase by means of laser beam diffraction and photon correlation spectroscopy. We found that the disordered structure and low frequency fluctuation characteristically distinguish SmCγ* from SmC and SmCA. These phenomena are qualitatively explained by the existing model structure,…