Thermophysical properties of lysozyme (protein) solutions
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Hydrogen based reactive ion etching of zinc sulfide
II–VI materials are important for optoelectronic devices. These devices are currently wet etched and due to the isotropic nature of wet etching, their etch geometries are limited. Reactive ion etching (RIE), a dry etch process, is a more desirable alternative, because it offers a means of producing small anisotropic s…
Shrinkage of atomic distances in ultrathin a-SiO2 film
Substrate-free a-SiO2 films, 480 Å in thickness, have been made by means of electron beam evaporation. Electron diffraction patterns, taken under the condition that the incident beam is normal to the films, are all centre-symmetric, while their intensity features vary considerably with the film thickness. Since a film…
High pressure studies on single crystals of zirconium sulphoselenides
Electrical resistance measurements have been performed on ZrS2, ZrSe2, and ZrSSe single crystals grown by Iodine vapour transport technique in the pressure range 10 kilobar to 80 kilobar (1 GPa-8GPa). It is observed that all these crystals show a decrease in resistance with increase in pressure. The results have been…
YTTRIUM ALUMINATE CERAMIC FIBERS VIA PRE-CERAMIC POLYMER AND SOL-GEL ROUTES
Yttrium aluminum garnet (YAG - Y3Al5O12) fibers have been prepared by dry spinning solutions of yttrium and aluminum carboxylate polymers (precursor route) and by dry spinning aqueous oxide sols (sol-gel route). Fibers from aqueous diphasic gels are prepared by mixing a colloidal alumina sol containing 50-nm hydrous a…
Structure and phase transitions in poly[bis‐(2,2,3,3‐tetrafluoropropoxy) phosphazene]
Abstract The structure and phase transitions in poly[bis‐(2,2,3,3‐tetrafluoropropoxy)phosphazene] have been studied by differential scanning calorimetry (DSC) and x‐ray diffraction. Two crystalline phases and one mesomorphic phase are found, denoted I, II, and III, respectively. These phases convert reversibly one int…
Utilization of Alcohols for the Dehydration of Magnesium Chloride
Two processes are proposed for preparing anhydrous magnesium chloride by use of alcohols. Some alcohols can replace water to form coordinates with MgCl2, and make the dehydration of magnesium chloride much easler. The possibility of dehydration by alcohol distillation is discussed, and n-butanol was found to be the pr…
Quantitative Fiber Mixture Analysis by Scanning Electron Microscopy
Labeling textile blends requires identification and quantification of their fibrous components. Blends of specialty animal fibers with sheep's wool are of special, practical importance; for these the light microscope is the traditional tool of analysis. To investigate the actual applicability of light microscopy for a…
Advances in NDI Elastomer Chemistry
Since its first commercial use in the early fifties naph thalene-1,5-diisocyanate (NDI) has been used almost exclusively in combina tion with polyadipate diols. The corresponding prepolymers crosslinked with 1,4-butanediol give solid NDI elastomers; crosslinking with water results in microcellular elastomers. NDI/este…
Non-stoichiometry effects in the properties of (NH4)3H(SeO4)2and (NH4)4H2(SeO4)3crystals. Dielectric and ESR studies
Large (NH4)H(SeO4)2 crystals and (NH4)4H22(SeO4)3 crystals grow usually from non-stoichiometric solutins with an excess of selenate acid. Complex dielectric anomalies at crystal phase transitions and suggest some kind of impurity in the crystal lattice. X-band ESR measurements of γ-irradiated single crystals identifie…
Ring Pattern Formation in 2- d Shear of Freely Suspended Films of a Smectic C Liquid Crystal
Space-time diagrams are used to analyze the dynamics of the liquid-crystal smectic C director in two-dimensional shear. We find a steady-state ring pattern only persists if there are no broken rings. A pair of defects, disclinations, is created when a ring breaks. With broken rings, the pattern dynamics is a sensitive…
Polymer gel films with simple organic electrochromics for single‐film electrochromic devices
Abstract Polymer gel films [poly(1‐vinyl‐2‐pyrrolidinone‐co‐ N,N ′‐methylenebisacrylamide) (PVPD)] which contain simple organic electrochromics [ p ‐diacetylbenzene ( p ‐DAB), dimethyl‐ or diethyl terephthalate ( p ‐DMP or p ‐DEP)] are prepared and their optical responses to applied voltage are investigated. p ‐DAP/PV…
Structure difference betweeniandTphases of Al-Cu-Co and Al-Cu-Fe observed by Mössbauer effect
Room-temperature M\"ossbauer spectra have been measured for icosahedral (i-phase) ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Fe}}_{15}$ and iron-doped decagonal (T-phase) ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{15}$${\mathrm{Co}}_{20}$ quasicrystals. The observed T-phase spectrum is qualitatively different from any…
The Mechanical Properties of Polyimide Films after Exposure to High pH
Wiring failures linked to insulation damage have drawn much attention in the aerospace industry and concerns have developed regarding the stability and safety of polyimide insulated electrical wire. Several polyimides were selected for evaluation for resistance to degradation by various aqueous alkaline solutions. The…
Ozone Resistance of Highly Saturated Nitrile Rubber (HNBR)
Ozone resistance of highly saturated nitrile rubber (HNBR) has been studied; the effect of hydrogenation progress of HNBR was evaluated at various ozone test conditions such as static, dynamic, and sequential condi tions. Dependence of its hydrogenation progress on ozone resistance is discussed by using parameters of…
The stability of antiphase boundaries on {111} planes in the l12compound fe3ge and its relation to the abnormal negative temperature dependence of yield strength
The instability of antiphase boundaries (APB's) on {111} is one possible explanation for the abnormal negative temperature dependence of yield strength (TOYS) in Fe3Ge but APB tubes are found in deformed Fe3Ge which suggests that APB{111}'s are not unstable. Actual measurement of the APB energy on {111} again indicate…
Darstellung und Kristallstruktur der Verbindungen MnCuX (X = P, As, PxAs1-x) / Preparation and Crystal Structure of Compounds MnCuX (X = P, As, PxAs1-x)
Three new ternary compounds MnCuP, MnCuP 0.5 As 0.5 and MnCuAs have been prepared and characterized by X-Ray, DTA and magnetic measurements. They crystallize orthorhombically in the space group P nma (No. 62). The structures were calculated from single crystal data. The melting points were determined by DTA measuremen…
End‐functionalized polymers of p‐alkoxystyrenes by living cationic polymerization, 2.p‐tert‐butoxystyrene
Abstract A series of end‐functionalized polymers of p‐tert ‐butoxystyrene (tBOS), with an acetoxy, an ethyl malonate, or a methacryloxy group, were synthesized by living cationic polymerization with the use of hydrogen iodide/zinc iodide (HI/ZnI 2 ) as initiating system: XCH 2 CH 2 OCH(CH 3 )‐(tBOS) n OCH 3 ( 4 ) [X:…
A mechanism of sodium-catalyzed carbon dioxide gasification of carbon investigation by pulse and TPD techniques
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA mechanism of sodium-catalyzed carbon dioxide gasification of carbon investigation by pulse and TPD techniquesToshimitsu Suzuki, Hiroyuki Ohme, and Yoshihisa WatanabeCite this: Energy Fuels 1992, 6, 4, 336–343Publication Date (Print):July 1, 1992Publication History Publishe…
Effects of UV exposure and thermal history on properties of a preimidized photosensitive polyimide
Abstract The structure and properties of a preimidized photosensitive polyimide (Probimide PSPI, a copolyimide of benzophenonetetracarboxylic dianhydride with alkyl groups substituted aromatic diamines) were studied with variations of UV exposure energy and bake temperature by means of wide angle X‐ray diffraction, dy…