Stability of Conducting Polythiophene and Derivatives
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Ab initio investigation on the lowest singlet and triplet state of disilyne (Si2H2)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb initio investigation on the lowest singlet and triplet state of disilyne (Si2H2)Hans Lischka and Hans Joachim KoehlerCite this: J. Am. Chem. Soc. 1983, 105, 22, 6646–6649Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Published inissu…
Semi-infinite systems with first-order bulk transitions
Semi-infinite systems are considered which undergo a first-order transition. The global phase diagram is discussed within the framework of Landau theory. Several types of phase transitions are found. At some of these transitions, critical surface phenomena occur since a variety of surface exponents may be defined alth…
Ammonium fluoride deposition during plasma etching of silicon nitride
During oxygen and carbon tetrafluoride plasma etching of silicon nitride, a light blue and water soluble film is deposited upon the surface of the silicon nitride layer. Depending upon the thickness, this film retards or completely inhibits the desired etching process. This film has been identified by infrared spectro…
The dielectric constant of coarse grained BaTiO3 ceramics
There is no simple experimental method which allows the separation of the dielectric constant in contributions of the bulk and those of 90°-domain wall motions. The contribution of the bulk is calculated in this paper for the specific domain configuration in large grains which was revealed by etch patterns. The volume…
Observation of Electro-Optical Effects in Blue Phase Systems
The blue phases of two cholesteric systems are studied under the influence of an electric field. The wavelength of maximum absorption due to the selective reflection of circularly polarized light of both blue phase I (BP I) and blue phase II (BP II) turns out to be shifted to longer wavelengths with increasing electri…
Pumping effects on thermal insulation of clothing worn by human subjects
This study was undertaken in order to analyse the importance of the pumping effect on clothing's thermal insulation. To enhance differences in heat exchanges due to the pumping effect, two sets of condition were fixed, minimizing either the convective or the radiative heat transfers. The results showed that: (i) the c…
Kinetics of ϵ‐caprolactone polymerization and formation of cyclic oligomers
Abstract The kinetics of the anionic polymerization of ϵ‐caprolactone, including the kinetics of macrocyclization and the kinetics of macrocycles propagation in THF solution, initiated with (CH 3 ) 3 SiONa, were investigated. Rate constants of propagation ( k p( n ) ) and of back‐biting ( k d( n ) ) involving monomer…
Liquid crystalline solvents as mechanistic probes. 11. The syn .fwdarw. anti thermal isomerization mechanism of some low-bipolarity azobenzenes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid crystalline solvents as mechanistic probes. 11. The syn .fwdarw. anti thermal isomerization mechanism of some low-bipolarity azobenzenesJoseph P. Ortruba III and Richard G. WeissCite this: J. Org. Chem. 1983, 48, 20, 3448–3453Publication Date (Print):October 1, 1983Pu…
Negative ions: effect of .alpha.- vs. .beta.-silyl substitution on the negative ion states of .pi. systems
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNegative ions: effect of .alpha.- vs. .beta.-silyl substitution on the negative ion states of .pi. systemsJudith C. GiordanCite this: J. Am. Chem. Soc. 1983, 105, 22, 6544–6546Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Published ini…
The Use of Computer Controlled Scanning Electron Microscopy in Environmental Studies
X-ray analyzer, and 3) the digital scan
Triboluminescence of glasses and quartz
The triboluminescent spectra of a variety of glasses and of crystalline quartz were measured while specimens were cut with a rotating diamond-impregnated saw blade. The spectra, which resemble the emission of a blackbody radiator, were recorded using an image-intensifier spectrograph. The data were intensity-corrected…
Solution processing and properties of molecular composite fibers and films
Abstract Experimental studies of fiber wet‐spinning and solution processing of films of molecular composites are presented. The rigid rod polymer was poly (p‐phenylenebenzobisthiazole) (PPBT) and the flexible polymers were poly (2,5(6′)‐benzimidazole) (ABPBI) and poly (2,5(6′)‐benzothiazole) (ABPBT). Effects of the fl…
Magnetic Phase Transitions in Itinerant Electron Magnets Hf 1- x Ta x Fe 2
Magnetic phase transitions in itinerant electron magnets Hf 1- x Ta x Fe 2 have been studied from measurements of Mössbauer effect, magnetization and X-ray diffraction. The first order magnetic phase transition from ferromagnetic to antiferromagnetic state has been observed with increasing temperature in the Ta concen…
Conversion of nitrogen dioxide, nitric acid, and n-propyl nitrate to nitric oxide by a gold-catalyzed reduction with carbon monoxide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConversion of nitrogen dioxide, nitric acid, and n-propyl nitrate to nitric oxide by a gold-catalyzed reduction with carbon monoxideMark J. Bollinger, Robert E. Sievers, David W. Fahey, and Frederick C. FehsenfeldCite this: Anal. Chem. 1983, 55, 12, 1980–1986Publication Date…
Dependence of the stimulated emission cross section of Yb<sup>3+</sup>on host glass composition
The stimulated emission cross section for the2F5/2→2F7/2transition of Yb3+has been determined from absorption and emission measurements of 41 different oxide, fluoride, and oxyfluoride glasses at 293 K. The effective peak cross sections for transitions to Stark levels above the ground state range from approximately 0.…
Optically induced Freedericksz transition and bistability in a nematic liquid crystal
An Euler equation, consistent with Maxwell's equations, for describing the optically induced spatial reorientation of the director of a homeotropically oriented nematic liquid crystal is obtained for the case of normal incidence. The exact solution describing the orientation of the director is obtained. By examining t…
Mechanical Properties of Mullite
The mechanical properties of alkoxy‐derived, high‐purity, translucent, theoretically dense mullite (3AI 2 O 3 .2SiO 2 ) were investigated over the temperature range room temperature to 1500°C. Large agglomerates were found to contribute to the formation of porosity nests which act as strength‐controlling flaws at room…
Polymer-polymer diffusion in melts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-polymer diffusion in meltsFrancoise Brochard, Jacqueline Jouffroy, and Paul LevinsonCite this: Macromolecules 1983, 16, 10, 1638–1641Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Published inissue 1 October 1983https://pubs.acs…
Grooved Titanium Surfaces Orient Growth and Migration of Cells from Human Gingival Explants
A silicon mask-etching technique was used to prepare grooved surfaces that control the direction of outgrowths of human gingival explants. The method used to produce the grooves is excellent in terms of both the uniformity of the grooves and the control with which surfaces of the desired specifications can be obtained.