Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Formation of a decagonal quasicrystal in Al 70 Pd 30- x Mn x alloys ( x =8-20) and its structure were examined by X-ray powder diffraction, electron diffraction and high-resolution electron microscopy. The decagonal quasicrystal is formed as a coexisting phase with an icosahedral phase in the composition range of x =1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of added block copolymer on the phase-separation kinetics of a polymer blend. 2. Optical microscopic observationsDong Won Park and Ryong Joon RoeCite this: Macromolecules 1991, 24, 19, 5324–5329Publication Date (Print):September 1, 1991Publication History Published on…
Die Addition eines tertiären Radikals an ein elektronenarmes Alken erwies sich als entscheidender Schritt bei der Synthese der quaterdirektionalen Kaskadenpolymere 1 und 2 , die keine Heteroatome im Initiatorkern, in den Verzweigungszentren oder in den Repetiereinheiten haben. Lediglich die Peripherie ist hochfunktion…
Photoluminescence and absorption experiments performed on Schott commercial and experimental CdSSe-doped glasses reveal the existence of a pair of narrow electronic states close to the electronic bands. According to a study of the luminescence as a function of the size of the semiconductor spheres, we tentatively inte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of diblock copolymer films containing self-assembled polyacetylene structuresRandall S. Saunders, Robert E. Cohen, and Richard R. SchrockCite this: Macromolecules 1991, 24, 20, 5599–5605Publication Date (Print):September 1, 1991Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-assembly and patterns in binary mixtures of SI block copolymer and PPOTakeji Hashimoto, Kohtaro Kimishima, and Hirokazu HasegawaCite this: Macromolecules 1991, 24, 20, 5704–5712Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect measurement of molecular level adhesion forces between biaxially oriented solid polymer filmsWilliam W. Merrill, Alphonsus V. Pocius, Bimal V. Thakker, and Matthew TirrellCite this: Langmuir 1991, 7, 9, 1975–1980Publication Date (Print):September 1, 1991Publication Hi…
Ice crystals growing vertically upwards in quiescent ultrapure water have been investigated at small subcoolings in the range of 0.035 T1.0 K. At subcooling less than 0.35 K, dendritic tips split and the tip radius ${\mathit{R}}_{2}$ drops because two tips replace one when viewed from the basal plane. The growth veloc…
Reaction of tran.s-4-alkyloxy-4′-stilbazoles (n-OPhVPy) with silver dodecylsulphate (AgDOS) led to the complexes [Ag(n-OPhVPy)2][DOS] which showed thermotropic mesomorphism. All homologues from methyloxy (n=1) to dodecyloxy (n=12) have been synthesised. The complexes showed a nematic phase at short chain lengths, but…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric polyhalogenated metalloporphyrin catalysts for hydroxylation of alkanes and epoxidation of alkenesTeddy G. Traylor, Young S. Byun, Patricia S. Traylor, Pierrette Battioni, and Daniel MansuyCite this: J. Am. Chem. Soc. 1991, 113, 20, 7821–7823Publication Date (Print…
A mathematical model has been developed to simulate the electrochemistry and thermal hydraulics in a crossflow monolithic solid oxide fuel cell. The fuel cell stack consists of a honeycomb structure of cells with alternating layers of anode, electrolyte, cathode, and interconnect. In each cell of the stack, the porous…
Effects of intrinsic defects on defect formation by excimer-laser irradiation were examined in synthetic silica glasses prepared by different methods. In samples containing oxygen-deficient centers (ODC's), laser-induced E' centers were stable at room temperature. In contrast, in samples heat treated in ${\mathrm{H}}_…
The infrared and Raman spectra of oligomeric model molecules of polyparaphenylenevinylene (PPV) and of the polymer in the pristine state, and the infrared spectra of doped or photoexcited PPV are analyzed in terms of the theory of the effective conjugation coordinate (ECC). It is shown that all the spectroscopic obser…
A detailed study of the electrical and defect properties of ion-implanted erbium in silicon shows that erbium doping introduces donor states. The concentration of erbium related donors as a function of implant dose saturates at 4×1016 cm−3 at a peak implanted Er-ion concentration of (4–7)×1017 cm−3. The defect levels…
The smectic layer thickness and the switching behavior in MHPOBC have been studied as a function of temperature; SmC α * is a tilted phase and is antiferroelectric at least in the higher-temperature region but becomes ferrielectric with decreasing temperature. The gradual appearance of ferrielectric characteristics in…
The two‐phase field involves a ZrO 2 ‐TiO 2 solid solution containing no more than 4 mol% TiO 2 , and a BaTiO 3 ‐BaZrO 3 solid solution containing a maximum of 75 mol% BaTiO 3 . The field narrows above 1300°C, probably because of the intrusion of a liquid‐phase field into the ternary, beginning near the BaO‐TiO 2 edge.
Abstract The linear coefficient of thermal expansion for three silicon single-crystal samples, taken from the head, middle, and tail of the same boule, and their powder samples have been measured at room temperature by using an X-ray powder diffractometer. All samples yield the same expansion value α =2.45 (± 0.04) ×…
The activity of NiO in NiO‐MgO rock salt solid solution has been measured at 1300 K by employing a solid‐state galvanic cell: Pt,Ni+ NiO||(CaO)ZrO 2 ||Ni + (Ni x ,Mg l‐x )O, Pt. A high‐density tube of Zr0 2 ‐15 mol% CaO has been used as the solid electrolyte for the emf measurements. The activities of the component ox…
The genus Cvptostegia R. Br. comprises two species, both of which are endemic to Madagascar. One species, C. grandiflora Roxb. ex R. Br., is widely naturalised in tropical regions of the world. The other species, C. madagascariensis Bojer ex Decne., comprises three varieties, of which C. madagascariensis var. glaberri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature effects on the crystallization kinetics of size-dependent systems in a continuous mixed-suspension mixed-product removal crystallizerJenn Fang Wu, Clifford Y. Tai, Wei Koun Yang, and Lii Ping LeuCite this: Ind. Eng. Chem. Res. 1991, 30, 9, 2226–2233Publication Da…