Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight-scattering characterization of poly(tetrafluoroethylene). 2. PTFE in perfluorotetracosane: molecular weight distribution and solution propertiesBenjamin Chu, Chi Wu, and Warren BuckCite this: Macromolecules 1989, 22, 2, 831–837Publication Date (Print):February 1, 1989P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of surface structure of built-up film of fluorocarbon amphiphile and polymer/(fluorocarbon amphiphile) composite thin film by means of x-ray photoelectron spectroscopyAtsushi Takahara, Naoaki Morotomi, Shoji Hiraoka, Nobuyuki Higashi, Toyoki Kunitake, and Tisato Kaj…
We have performed an exact real-space renormalization-group calculation of the complete wave-vector- and frequency-dependent-response function, S(q,\ensuremath{\omega}), for the one-dimensional Fibonacci-chain quasicrystal with ``Goldstone'' dynamics as in the case of phonons or magnons. We present surface plots, whic…
We report experimental studies of the onset of hard-mode Raman activity in some AB′ x B″1−x O3-type compounds related closely to the perovskites. The first order Ramanscattering seems to appear due to a phase transition at high temperatures into Fm3m space group from the Pm3m paraphase. We believe that the existence o…
A one‐dimensional mathematical model for the lithium/thionyl chloride primary cell has been developed to investigate methods of improving its performance and safety. The model includes many of the components of a typical lithium/thionyl chloride cell such as the porous lithium chloride film which forms on the lithium…
In Landau--de Gennes theory, the free energy f of liquid crystals is expanded into powers of a symmetric, traceless tensor order parameter ${Q}_{\ensuremath{\alpha}\ensuremath{\beta}}$ and its derivatives ${Q}_{\ensuremath{\alpha}\ensuremath{\beta}}$,\ensuremath{\gamma}. The expansion is subject to the condition that…
Amine aus Amiden, Nitrilen und Nitroalkenen, Alkohole aus Carbonsäuren und Sulfide aus Sulfoxiden werden in guten Ausbeuten mit dem Reduktionsmittel LiBH 4 /Me 3 SiCl erhalten. Auch α‐Aminosäuren lassen sich leicht und unter Erhalt der optischen Reinheit zu Aminoalkoholen reduzieren. 1, 3 und 5 sind Beispiele für Eduk…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHalf-open metallocenes of iron, ruthenium, and osmium: synthesis, characterization, photoelectron spectroscopy, and theoretical calculationsRolf. Gleiter, Isabella. Hyla-Kryspin, Manfred L. Ziegler, Gertrud. Sergeson, Jennifer C. Green, Lothar. Stahl, and Richard D. ErnstCit…
Expressions for the electron energy-loss probability are obtained for electrons travelling parallel to, firstly, one and, secondly, two coaxial cylindrical interfaces between different media. These expressions have been evaluated for Al-vacuum interfaces confirming that the cylindrical modes behave in the manner expec…
Abstract A deforming FEM (DFEM) analysis of one‐dimensional inverse Stefan problems is presented. Specifically, the problem of calculating the position and velocity of the moving interface from the temperature measurements of two or more sensors located inside the solid phase is addressed. Since the interface velocity…
In this investigation, critical manipulation, observation, and analysis of polarization curves as a function of nitrogen content in cast duplex CF-type stainless steels (SSs) has been performed. These, in conjunction with microstructural observations and atomic absorption spectroscopic analyses of polarization cell so…
The determination of alpha-amylase activity using an ethylidene-blocked 4-nitrophenyl-maltoheptaoside (EPS) has been evaluated in five laboratories on eight different analysers at 25 degrees C, 30 degrees C and 37 degrees C. The protecting ethylidene group inhibits hydrolysis at the non-reducing end of the substrate m…
Measurements were made of preferential uptakes of acetic acid from aqueous solution onto basic polymer sorbents.Individual uptakes of water and acetic acid were measured as well.The sorption equilibria were interpreted through a chemical complexation model yielding sorption affinities and capacities for acetic acid.Ba…
A mathematical model that describes the combined diffusion and reaction of trichloromethylsilane in a porous preform under typical chemical vapor infiltration (CVI) conditions is presented. The model utilizes a single pore to demonstrate the importance of the pore geometry, total gaseous pressure, temperature, and imp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of alkynes catalyzed by molybdenum(VI) and tungsten(VI) polyoxometalatesFrancesco Paolo Ballistreri, Salvatore Failla, Emanuela Spina, and Gaetano Andrea TomaselliCite this: J. Org. Chem. 1989, 54, 4, 947–949Publication Date (Print):February 1, 1989Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental and theoretical study of tetrakis(di-p-tolylformamidinato)dimolybdenum and [Mo2(form)4]+ (form- = [(p-tol)NCHN(p-tol)]-)F. Albert Cotton, Xuejun Feng, and Marek MatuszCite this: Inorg. Chem. 1989, 28, 3, 594–601Publication Date (Print):February 1, 1989Publicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltraviolet photoelectron and ESR studies of 1,2,4,6-thiatriazinyl and 1,2,3,5-dithiadiazolyl radicalsRene T. Boere, Richard T. Oakley, Robert W. Reed, and Nicholas P. C. WestwoodCite this: J. Am. Chem. Soc. 1989, 111, 4, 1180–1185Publication Date (Print):February 1, 1989Pub…
Microcrystalline α‐aluminas (hexagonal plates, ∼0.1 μm wide and ∼0.025 μm thick) were prepared by treating fineparticle gibbsite in glycol at 300°C under the spontaneous vapor pressure of glycol (glycothermal treatment). The α‐alumina was formed by the collapse of the glycol derivative of boehmite.
By considering the Frank free energy, we show that the electric-field-induced twist and bend Freedericksz transitions can be first order. This agrees with the prediction of Arakelyan, Karayan, and Chilingaryan [Sov. Phys.--Dokl. 29, 202 (1984)] from Landau theory for the bend geometry. We have carried out dielectric m…
Nickel and lead phthalocyanine (NiPc and PbPc) thin films prepared by vacuum sublimation have been investigated for use as gas sensors. High sensitivity (25 ppb), reversibility, and very fast response time (∼ seconds) have been demonstrated for detection of NO2 at room temperature. The sensor output increases by five…