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。
The sintering behavior of powder compacts formed from spherical, nearly monosized SiO 2 particles was investigated. Highly ordered compacts sintered to high density and translucency at 1000°C. In contrast, less homogeneous samples prepared from flocculated suspensions remained highly porous after sintering under the s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLanthanide 4f .fwdarw. 4f electric dipole intensity theoryMichael F. Reid and F. S. RichardsonCite this: J. Phys. Chem. 1984, 88, 16, 3579–3586Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published inissue 1 August 1984https://pubs.acs…
Mo2(gly)4]Cl4.«H20,8 [Cr2(gly)4]X4-nH20 (X = Cl, Br),9 and [Rh2(0-ala)4] (C104)4-2H20.10One known exception to this "right, right, left, left" order is the compound [Mo2(gly)4]- (S04)2-4H20,'1 in which the order is "right, left, right, Left".It is notable that this compound is obtained by dissolution of the chloride s…
The pH of the solution from which the gel is precipitated determines the calcined zirconia crystal phase. Monoclinic zirconia is produced from materials precipitated in the 6.5 to 10.4 pH range; the tetragonal precursor is obtained for the 3 to 4 or 13 to 14 pH range. The calcination atmosphere, temperature history du…
Using an in situ substratum enrichment method, we assessed the effects of nutrient release from sand substrata on the community structure of attached diatoms in a sand-bottomed, northern Michigan stream. Sand from the stream bottom was washed, sterilized, and then consolidated into small plastic petri dishes with agar…
Interest in the synthesis of optically active smectic liquid crystals has increased considerably since the advent of a fast switching, bistable, electrooptic device configuration based on their ferroelectric properties. A number of structurally separate ferroelectric liquid crystal phases have been defined which posse…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced electron transfer in meso-triphenyltriptycenylporphyrin-quinones. Restricting donor-acceptor distances and orientationsMichael R. Wasielewski and Mark P. NiemczykCite this: J. Am. Chem. Soc. 1984, 106, 17, 5043–5045Publication Date (Print):August 1, 1984Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular dynamics simulations of a supercooled monatomic liquid and glassJeffrey R. Fox and Hans C. AndersenCite this: J. Phys. Chem. 1984, 88, 18, 4019–4027Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published inissue 1 August 1984h…
Recently some mono-alkylated derivatives of β-D-glucopyranoside and thio-α-D-mannopyranoside were shown to exhibit liquid crystal properties. The structure of the phase produced by these materials was described as being of a layered smectic type. However, a full classification of the phase was not given. The present i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of block copolymers at a demixed homopolymer interfaceJaan Noolandi and Kin Ming HongCite this: Macromolecules 1984, 17, 8, 1531–1537Publication Date (Print):August 1, 1984Publication History Published online1 May 2002Published inissue 1 August 1984https://pubs.acs.or…
Kaolinite crystallites, which are pseudohexagonal platelets, generally are found not singly but as intergrowths or aggregates of several platelets. Until recently only coarser intergrowths (Figs. 1-2) could be imaged with SEM in sufficient detail for intersectional relationships to be unambiguously interpreted. With n…
Ferrous sulphate BP, FeSO4,7H2O, dehydrates to form FeSO4,4H2O when the relative humidity (RH) is less than 65%, or on heating at 40 degrees C. The tetrahydrate was also prepared by recrystallization at 60 degrees C from aqeuous solutions of the sulphate. Commercial dried ferrous sulphate BP is FeSO4,H2O but the metho…
Abstract The intercalation of formamide, potassium acetate, and hydrazine by halloysite and/or ka-olinite-rich samples, with and without subsequent displacement of the interlayer species by water or glycerol/water, has been investigated. Halloysite, as such, or in mixtures with kaolinite is completely expanded by all…
The main processes of metallic corrosion in primary circuits of advanced high-temperature gas-cooled reactors (HTGRs) at temperatures above 800 °C are oxidation, carburization, and decarburization. These are caused by helium impurity traces of H2O (causing oxidation and decarburization), CO (causing oxidation and carb…
Abstract The activities of TiO2-supported bimetallic catalysts of Fe–Co, Co–Ni and Ni–Fe for CO conversion were greater than those of pure metal catalysts. The selectivities of alloy catalysts relative to pure metal catalysts were shifted to higher molecular hydrocarbons.
Abstract. Calcium is the soluble cation that occurs in largest amount in most soils. It does not take part directly in the proton transfer reactions involved in pH‐buffering, but it provides the cation charge balance for these reactions. It is also the complementary cation in formulations of chemical potential for man…
Abstract Adsorption of Cu 2+ and Co 2+ by synthetic imogolite, synthetic allophanes with a range of SiO 2 / Al 2 O 3 ratios, and allophanic clay fractions from volcanic ash soils was measured in an ionic medium of 0.05 M Ca(NO 3 ) 2 . The effect of pH (and metal concentration) on adsorption was qualitatively similar f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of thermal degradation of polyurethanes. Effect of ammonium polyphosphateGiorgio Montaudo, Concetto Puglisi, Emilio Scamporrino, and Daniele VitaliniCite this: Macromolecules 1984, 17, 8, 1605–1614Publication Date (Print):August 1, 1984Publication History Published…
Molecular orbital calculations, using the Xa scattered wave method, were done for the clusters MnOl,0-, MnO?-, and MnOB- corresponding to Mn2*, Mn3*, and Mna* in octahedral coordination with O2-. Bond lengths representative of those observed in manganese oxides were chosen and 05 symmetry was used for each cluster. Th…
The bandstructures were calculated by the local-spin-density (LSD) method for the alloys Cu 2 MnAl, Ni 2 MnSn, Pd 2 MnSn, Pd 2 MnSb, Co 2 MnSn, Co 2 TiSn, Co 2 TiAl and Mn 2 VAl. We calculated the magnetic moments and the hyperfine fields for these alloys on the basis of the bandstructures. The peak near the Fermi lev…