Materials Literature
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Polyaniline films electrodeposited from acidified nonaqueous organic media were investigated for their electropolymerization behavior and charge‐discharge characteristics. The solution system used for the electropolymerization of polyaniline film was CF 3 COOH acidified propylene carbonate, which was previously found…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of poly(diarylamines): a new class of electrochromic conducting polymersJean Guay, Royston Paynter, and Le H. DaoCite this: Macromolecules 1990, 23, 15, 3598–3605Publication Date (Print):July 1, 1990Publication History Published online1 May 200…
Abstract The oxidation kinetics of polycrystalline hafnium (Hf) at room temperature and low oxygen pressure ( P o 2 ∼ 10 −7 Torr) has been studied by x‐ray photoelectron spectroscopy (XPS). After a chemisorption stage for exposures ⩽ 5 L, Hf suboxides are initially formed and are dominant until ∼ 25 L. HfO 2 appears a…
The thermal expansion coefficients of transition‐metal‐free sinter mullite and fused mullite, and of chromium‐doped (11.5 wt% Cr 2 O 3 ) and iron‐doped (10.3 wt% Fe 2 O 3 ) sinter mullites are measured between 25° and 900°C by high‐temperature Guinier X‐ray diffraction techniques. Most mullites display low and nonline…
It is shown how a partial discharge (PD) within a test sample generates a signal that can be measured outside the apparatus under test. Because the transfer function between the phenomenon within the apparatus under test and the signal that can be measured can vary widely, measured partial-discharge magnitudes rarely…
The passage of dislocations across grain boundaries in metals has been studied by using the in situ TEM deformation technique. A detailed analysis of the interaction of glissile matrix dislocations with grain-boundary dislocations has been performed. The results show that the dislocations piled-up at the grain boundar…
New highly sensitive thermoluminescence detectors of broad application on the basis of anion-defective a-Al2O3:C single crystals have been developed. The decisive role of non-stoichiometry in forming luminescence properties of crystals has been ascertained by methods of optical, luminescence and exoemission spectrosco…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDabco-metalloporphyrin binding: ternary complexes, host-guest chemistry and the measurement of .pi.-.pi. interactionsChristopher A. Hunter, M. Nafees Meah, and Jeremy K. M. SandersCite this: J. Am. Chem. Soc. 1990, 112, 15, 5773–5780Publication Date (Print):July 1, 1990Publi…
Alcaligenes latus, Alcaligenes eutrophus, Bacillus cereus, Pseudomonas pseudoflava, Pseudomonas cepacia, and Micrococcus halodenitrificans were found to accumulate poly-(beta-hydroxybutyric-co-beta-hydroxyvaleric) acid [P(HB-co-HV)] copolymer when supplied with glucose (or sucrose in the case of A. latus) and propioni…
A systematic study of hysteresis in model continuum and lattice spin systems is undertaken by constructing a statistical-mechanical theory wherein spatial fluctuations of the order parameter are incorporated. The theory is used to study the shapes and areas of the hysteresis loops as functions of the amplitude (${\mat…
Abstract Organic acids can form stable complexes with metals and therefore can affect metal solubility and speciation. The low‐molecular‐weight aliphatic organic acids extracted in water and present in soil solution from O, A, Bh and Bt horizons from a group of forested Utlisols, Entisols and Spodosols were identified…
Abstract We present chain structure, phase morphology, and toughness relationships in thermoplastic polymers and polymer/rubber blends. In neat polymers, molecular aspects of craze/yield behavior are controlled by two chain parameters: entanglement density ν e and characteristic ratio C ∞ . The crazing stress is propo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new ambient-pressure organic superconductor, .kappa.-(ET)2Cu[N(CN)2]Br, with the highest transition temperature yet observed (inductive onset Tc = 11.6 K, resistive onset = 12.5 K)Aravinda M. Kini, Urs Geiser, Hau H. Wang, K. Douglas Carlson, Jack M. Williams, W. K. Kwok,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation hardness: new index for describing the orientation of electrophilic aromatic substitutionZhongxiang Zhou and Robert G. ParrCite this: J. Am. Chem. Soc. 1990, 112, 15, 5720–5724Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Publi…
This paper deals with the application of ZnO varistors—an area which has not been treated in a systematic way in the literature. The paper starts with a brief description of the fundamental properties comprising the electrical behavior as well as the physics, chemistry, and microstructure of the varistor. These proper…
Experimental observation of the nonadditivity of various mechanisms of population inversion of the 4I11/2→4I13/2 transition of the Er3+ ion in a YSGG:Cr3+:Er3+ crystal, M A Noginov, G K Sarkisyan, Valerii A Smirnov, A F Umyskov, Ivan A Shcherbakov
A compact desk reference, this book includes all the subjects contained in the 17 alphabetical volumes and the Supplement and Index volumes of the Encyclopedia of Polymer Science and Engineering. The articles have been condensed by professional science writers, reviewed for accuracy by the original authors or their co…
This graduate textbook presents a concrete and up-to-date introduction to the theory of Coxeter groups. The book is self-contained, making it suitable either for courses and seminars or for self-study. The first part is devoted to establishing concrete examples. Finite reflection groups acting on Euclidean spaces are…
The optical absorption and electron spin resonance spectra of vanadyl-and copper-doped rubidium cadmium sulphate hexahydrate are investigated at room and liquid nitrogen temperatures. From the analysis, the spectra are ascribed C 4v site symmetry in the case of VO 2+ ions and D 2h site symmetry in the case of Cu 2+ io…
Solid solutions of (KI${)}_{1\mathrm{\ensuremath{-}}\mathit{x}}$(${\mathrm{NH}}_{4}$I${)}_{\mathit{x}}$ with concentrations x=0.14, 0.43, and 1 were investigated using dielectric spectroscopy. The high-temperature rocksalt structure of these compounds exhibits a dipole moment of 1.4 D. For x=0.14 and 0.43 the NaCl str…