A "Smart" Ultrathin Photochromic Layer
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Nature of Structural Disorder in Natural Kaolinites: A New Model Based on Computer Simulation of Powder Diffraction Data and Electrostatic Energy Calculation
Abstract A new model for the description of the structural disorder in natural kaolinite materials is proposed, based on the stacking of two 1:1 layers and their enantiomorphs, and encompassing previously proposed models. The layers, where randomly stacked along the c axis (using probabilistic functions nested in recu…
Effect of Gallium-Porphyrin Analogue ATX-70 on Nitroxide Formation from a Cyclic Secondary Amine by Ultrasound: On the Mechanism of Sonodynamic Activation
Sonodynamic therapy is a promising new modality for cancer treatment based on the synergistic effect on tumor cell killing by combination of a drug (typically a photosensitizer) and ultrasound. The mechanism of sonodynamic action was suggested to involve photoexcitation of the sensitizer by sonoluminescent light, with…
Photoluminescence and electroluminescence in partially oxidized porous silicon
The results of photoluminescence (PL) and electroluminescence (EL) studies from partially oxidized porous silicon (POPS) layers are presented. The PL from POPS is stable, peaks at 600-570 nm and its temperature dependence can be fitted by an exponential law with an activation energy Ea ≈ 10 meV. The current-voltage ch…
Measurements of Excess Enthalpy in Ultrafine‐Grained Titanium Dioxide
Differential scanning calorimetry has been used to make direct measurements of the excess enthalpy of TiO 2 (rutile) with an initial grain size of 30–70 nm. When the heat released during grain growth is normalized to the change in grain boundary area, the specific excess enthalpy at low temperatures and fine grain siz…
Synchrotron-Based Method for the Study of Crystallization: Templated Formation of CoALPO-5 Catalyst
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynchrotron-Based Method for the Study of Crystallization: Templated Formation of CoALPO-5 CatalystFernando Rey, Gopinathan Sankar, John Meurig Thomas, Phillip A. Barrett, Dewi W. Lewis, C. Richard A. Catlow, Simon M. Clark, and G. Neville GreavesCite this: Chem. Mater. 1995…
Alternating Lamellar Structure of Triblock Copolymers of the ABA Type
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlternating Lamellar Structure of Triblock Copolymers of the ABA TypeY. Matsushita, M. Nomura, J. Watanabe, Y. Mogi, I. Noda, and M. ImaiCite this: Macromolecules 1995, 28, 18, 6007–6013Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Publ…
Polycrystalline Yttrium Aluminum Garnet Fibers from Colloidal Sols
Polycrystalline yttrium aluminum garnet (YAG) fibers were prepared from commercially available colloidal sols of Y 2 O 3 and AlOOH and water‐soluble polymers. The fibers were dry spun and all processing was performed in air. Transformation to YAG was complete by ≅1300°C, and the fibers were mostly dense by 1600°C with…
Polyiron(III)-Alkoxo Clusters: a Novel Trinuclear Complex and Its Relevance to the Extended Lattices of Iron Oxides and Hydroxides
The synthesis, solid-state structure and magnetic characterization of KFe3(OMe)7(dbm)3·4MeOH (I; Hdbm = dibenzoylmethane) are reported. I readily assembles in methanolic solns. of Fe(III) chloride and Hdbm in the presence of an excess of K methoxide; it crystallizes in the triclinic space group P-1 with a = 13.044(1),…
Electron-transfer boat-vibration mechanism for superconductivity in organic molecules based on BEDT-TTF
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron-transfer boat-vibration mechanism for superconductivity in organic molecules based on BEDT-TTFErsan Demiralp, Siddharth Dasgupta, and William A. Goddard IIICite this: J. Am. Chem. Soc. 1995, 117, 31, 8154–8158Publication Date (Print):August 1, 1995Publication Histor…
Step-by-step thinning of free-standing films above the smectic-A–nematic phase transition
Optical reflectivity of free-standing films at the smectic-A--nematic (Sm-A--N) phase transition has been studied. The Sm-A films thin in a stepwise manner in the nematic temperature interval. The film thickness can be described by a power function of maximal temperature at which this thickness is stable. The value of…
Morphology Control in Electrochemically Grown Conducting Polymer Films. 3. A Comparative Study of Polyaniline Films on Bare Gold and on Gold Pretreated with p-Aminothiophenol
Polyaniline (PANI) films deposited galvanostatically on gold electrodes precoated with self-assembled monolayers of p-aminothiophenol (PATP) exhibit significantly higher optical densities than similar polymer films deposited on bare gold, as measured by in situ ellipsometry. At the same time there is no change in the…
High Temperature X-Ray Diffraction Study of Melt Structure of Silicon
The structure of molten silicon has been determined at three temperatures of 1440, 1460 and 1520° C by X-ray diffraction. All structure factors indicate a characteristic small hump on the higher wave vector side of the first peak and such specific feature becomes slightly obscure as the temperature increases. A small…
The Synthesis and Properties of Face-to-Face Metallocene Polymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Synthesis and Properties of Face-to-Face Metallocene PolymersMyron Rosenblum, Helen M. Nugent, K.-S. Jang, M. M. Labes, W. Cahalane, Philip Klemarczyk, and William M. ReiffCite this: Macromolecules 1995, 28, 18, 6330–6342Publication Date (Print):August 1, 1995Publication…
Tervalent-Metal Porphyrin-Phthalocyanine Heteroleptic Sandwich-Type Complexes. Synthesis, Structure, and Spectroscopic Characterization of Their Neutral, Singly-Oxidized, and Singly-Reduced States
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTervalent-Metal Porphyrin-Phthalocyanine Heteroleptic Sandwich-Type Complexes. Synthesis, Structure, and Spectroscopic Characterization of Their Neutral, Singly-Oxidized, and Singly-Reduced StatesD. Chabach, M. Tahiri, A. De Cian, J. Fischer, R. Weiss, and M. El Malouli Bibo…
Large Self-Assembled Organopalladium Spheres
We present experimental results of a version of the Choppertron microwave generator designed to work with the high emittance beam of the Advanced Test Accelerator (ATA). Simulations showed that a 800-A, 120 {pi} cm-mrad beam (typical of ATA), could produce 800 MW of rf (11.4 GHz) power using two 12-cell, traveling-wav…
Cavitation Contributes Substantially to Tensile Creep in Silicon Nitride
During tensile creep of a hot isostatically pressed (HIPed) silicon nitride, the volume fraction of cavities increases linearly with strain; these cavities produce nearly all of the measured strain. In contrast, compressive creep in the same stress and temperature range produces very little cavitation. A stress expone…
Temperature dependence of the photostimulated luminescence of BaFCl:Eu2+ after ultraviolet irradiation
The variation of intensity of the photostimulated luminescence (PSL) of BaFCl:Eu2+ after ultraviolet irradiation with temperature has been investigated. The results show that the PSL intensity is independent of temperature in the readout process, but the storage ability is temperature dependent. The measurements suppo…
Splitting of Wyckoff positions (orbits). II. Group-subgroup chains of index 6.1
Abstract A crystal structure is usually described as the union of sets of symmetrically equivalent atoms, i.e. as the union of orbits. During a continuous or nearly continuous phase transition, symmetrically equivalent atoms of a crystal structure may become inequivalent, their site symmetries may be reduced, or both…
Phenolics of Picnomon acarna
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhenolics of Picnomon acarnaGregory G. Laskaris, Dimitris C. Gournelis, and Eugene KokkalouCite this: J. Nat. Prod. 1995, 58, 8, 1248–1250Publication Date (Print):August 1, 1995Publication History Published online1 July 2004Published inissue 1 August 1995https://doi.org/10.1…