Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Studies of Copper(II)-Chelated Polymers Derived from Hydroxy-Functionalized Liquid Crystalline Homo- and CopolyazomethinesL. Oriol, P. J. Alonso, J. I. Martinez, M. Pinol, and J. L. SerranoCite this: Macromolecules 1994, 27, 7, 1869–1874Publication Date (Print):Ma…
<div class="htmlview paragraph">Intensive research and development activities which have been carried out by automotive manufacturers and suppliers of the automotive industry are currently focused on new solutions to meet the strict exhaust gas emission standards defined by LEV, ULEV and EG III. While both CO an…
Sodium borovanadate glasses have been investigated using infrared spectroscopy (IR) and magic angle spinning nuclear magnetic resonance (MAS NMR) studies. It is found that modification of borovanadate glass structure leads to the formation of tetrahedral boron and the ratio of tetrahedral $(B_4)$ to trigonal boron $(B…
We have investigated the fragmentation of gallstones using the pulsed Ho:YAG laser, comparing it to lithotripsy using the visible pulsed-dye laser. We find that the physical mechanisms of stone fragmentation appear to be quite different in the two cases. Using high-speed photography, measurement of acoustic transients…
Mixed solutions of Ca(NO 3 ) 2 and (NH 4 ) 2 HPO 4 with Ca/P = 1.50 were spray‐pyrolyzed at 600°C to produce β‐calcium orthophosphate (β‐Ca 3 (PO 4 ) 2 ) powder; the spray‐pyrolyzed powder was ground and then calcined at 600°C for 1 h. The best crystalline β‐Ca 3 (PO 4 ) 2 powder was obtained from the solution with 1.…
Abstract An approach to reproduce the solubility profile of a drug in several solvent mixtures showing two solubility maxima is proposed in this work. The solubility of sulphamethoxypyridazine was determined at 25°C in several mixtures of varying polarity (hexane: ethyl acetate, ethyl acetate:ethanol and ethanol: wate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBacterial production of poly(.beta.-hydroxyalkanoates) containing unsaturated repeating units by Rhodospirillum rubrumHerbert W. Ulmer, Richard A. Gross, Mario Posada, Paul Weisbach, R. Clinton Fuller, and Robert W. LenzCite this: Macromolecules 1994, 27, 7, 1675–1679Publica…
The mechanical behavior of three CVT‐processed 2D woven SiC/BN/SiC composite materials with different initial BN interphase thicknesses has been investigated by means of tensile and impact tests. The results have established the efficiency of a BN interphase in promoting a nonlinear/non–catastrophic tensile behavior a…
In order to gain insight into the degradation mechanisms associated with ferroelectric thin films, such as fatigue and imprint, an understanding of the defect chemistry and transport properties of the material is needed. In this study several complimentary techniques have been used to either measure or calculate indir…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetically Coupled Molecular System Composed of Organic Radicals with Different Spin MultiplicitiesAkira Izuoka, Masanori Fukada, Reiji Kumai, Mitsuhiro Itakura, Shinobu Hikami, and Tadashi SugawaraCite this: J. Am. Chem. Soc. 1994, 116, 6, 2609–2610Publication Date (Print…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAMTeS3 (A = K, Rb, Cs; M = Cu, Ag): A New Class of Compounds Based on a New Polychalcogenide Anion, TeS32-Xiang Zhang and Mercouri G. KanatzidisCite this: J. Am. Chem. Soc. 1994, 116, 5, 1890–1898Publication Date (Print):March 1, 1994Publication History Published online1 May…
Abstract In this short review, some important phenomena often observed in blends of thermotropic liquid crystalline and thermoplastic polymers are described. Their outstanding physical properties will probably lead to applications as in situ composites. LCP of low concentration in the thermoplastic matrix can be used…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Characterization, and Langmuir-Blodgett Films of Fluorinated PolythiophenesLucie Robitaille and Mario LeclercCite this: Macromolecules 1994, 27, 7, 1847–1851Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 Mar…
Nanoparticles /spl gamma/-Fe/sub 2/O/sub 3/ were prepared in silica matrix by the sol-gel process. Conventional acid hydrolysis and polycondensation of tetraethyl orthosilicate (TEOS) were used for the preparation of porous silica matrix. Iron(III) nitrate was homogeneously dissolved in the initial TEOS solution. Afte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Catalytically Active Polymer-Bound Transition Metal Complexes for Selective Epoxidation of OlefinsBinod B. De, Braj B. Lohray, Swaminathan Sivaram, and Pradeep K. DhalCite this: Macromolecules 1994, 27, 6, 1291–1296Publication Date (Print):March 1, 1994Publicati…
β‐Barium borate (BBO) surface crystallized glass composites were prepared for a glass of composition 40BaO·15Tio 2 –45B 2 O 3 (in mol%). Enhanced nucleation was attained by ultrasonic surface modification with an aqueous suspension of BBO particles, resulting in dense BBO thin films on the glass surfaces. Second harmo…
We have proposed a new optical method for measuring the twist angle of twisted nematic cells, and the method has been applied to obtain the azimuthal anchoring energy for a nematic liquid crystal. The method is based on a modulation in the polarization state of an incident probing laser beam to the sample cells, and t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvation Dynamics of Coumarin 153 in Molten SaltsE. Bart, A. Meltsin, and D. HuppertCite this: J. Phys. Chem. 1994, 98, 13, 3295–3299Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published inissue 1 March 1994https://pubs.acs.org/doi/10…
Up to 3 moles of Li are inserted per mole of V 2 O 5 · 0.5 H 2 O xerogel (XRG), as shown by concurrent charge and mass measurements with a quartz crystal microbalance. Further, it is demonstrated that only Li + ions are intercalated from the electrolyte, without cointercalation by other species in LiClO 4 solutions in…
The photoexcited triplet states of the nonplanar porphyrins, free base and zinc 2,3,7,8,12,13,17,18-octaethyl-5,10,15,20-tetraphenylporphyrins (OETPPs), were examined by laser excitation-time resolved EPR spectroscopy. Measurements were carried out at low temperatures in glassy matrices, and over a wide temperature ra…