Materials Literature
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Abstract The use of preformed poly‐(propylene imine) dendrimers (DAB‐ dendr ‐(NH 2 ) x ) for the rapid and facile construction of high molecular weight carbohydrate‐coated dendrimers (glyco‐dendrimers) is presented. An efficient attachment of spacer‐armed derivatives of D‐galactose and lactose to the primary amino end…
The reasons for the predominant electron-donicity of almost all solid polar surfaces and its implications are discussed in this paper. By contact angle or interfacial tension measurements, the electron-accepting as well as the electron-donating properties of polar liquids can be ascertained, through the interplay betw…
3‘,4‘-Dibutyl-5,5‘‘-diphenyl-2,2‘:5‘,2‘‘-terthiophene (Bu 2 Ph 2 Tth) can be readily converted to the stable cation radical [Bu 2 Ph 2 Tth] + . The hexafluorophosphate salts of the cation radical ([Bu 2 Ph 2 Tth]PF 6 ) are synthesized in millimolar quantities by either chemical or constant current electrochemical oxid…
Ferroelectric materials (FEM's) are very attractive because their dielectric constant can be modulated under the effect of an externally applied electric field perpendicular to the direction of propagation of a microwave signal. FEM may be particularly useful for the development of a new family of planar phase shifter…
Other| June 01, 1997 Rietveld refinement of Ca2 TiSiO6 perovskite Kurt Leinenweber; Kurt Leinenweber Arizona State University, Department of Chemistry, Tempe, AZ, United States Search for other works by this author on: GSW Google Scholar John B. Parise John B. Parise State University of New York, United States Search…
Anionic ring-opening polymerization of a seven-membered cyclic carbonate, 1,3-dioxepan-2-one (1), was carried out to observe that the higher the polymerization temperature and lower the initial monomer concentration were, the lower the yield and molecular weight, and wider the molecular weight distribution of the obta…
Abstract Small angle X‐ray methods have been used to investigate the self‐assembling columnar structures formed by a polymethacrylate with large highly tapered side groups, and by one of its low molar mass precursors. The polymer is poly{2‐{2‐[2‐(2‐methacryloyloxyethoxy)ethoxy] ethoxy}ethyl‐3, 4, 5‐tris( p ‐dodecyloxy…
Other| June 01, 1997 A calcite → aragonite-type phase transition in CdCO3 Lin-gun Liu; Lin-gun Liu Academia Sinica, Institute of Earth Sciences, Taipei, Taiwan Search for other works by this author on: GSW Google Scholar Chung-Cherng Lin Chung-Cherng Lin Search for other works by this author on: GSW Google Scholar Ame…
This paper is concerned with the study of the leakage spectra of total gamma rays and fast neutrons from two types of heavy concretes made from local magnetite ores. The two types are the steel-magnetite concrete (ρ=5.11 g/cm 3 ) and the basalt-magnetite concrete (ρ=3.05 g/cm 3 ). The radiation source used was a colli…
The structure of ferroelectric domain walls in BaTiO3 has been investigated through two complementary approaches, a global one by the fine analysis of X-ray diffraction patterns, the other essentially local via a quantitative image analysis method developed and applied to High Resolution Transmission Electron Microsco…
A series of novel heterocyclic esters has been prepared based on selenophene, thiophene and furan units; for comparison the parent, phenyl analogue was also prepared. All the materials except the least linear furan analogue are mesogenic and exhibit the SA, SC*, SC*ferri and SC*anti liquid crystalline phases. In addit…
Many different models for C02 corrosion are used by engineers in the oil and gas industry. Some are described in the open literature and only those are covered by this review. In order to classify the CO2 corrosion models, we have arbitrarily decided to group them into three categories based on how firmly they are gro…
Novel liquid-crystalline (LC) thiophene derivatives were synthesized, and their LC behavior and photoresponsive behavior were explored. Among the thiophene derivatives synthesized, 4-(4-alkylphenylazo)phenyl 2-thienylacrylates ( TAn, n = 4, 5, 6, and 7) were found to show nematic (N) phase. TAn exhibited the N phase o…
It is difficult to go through a whole day without coming in contact with something which does not contain a foamed plastic part somewhere within. The most common examples perhaps are the foamed polyurethane seat cushion of the sofa or chair or the car-seat that you sat on this morning, or the polystyrene foam cup in w…
Microbiologically influenced corrosion (MIC) is an extremely complex phenomenon whose understanding requires several disciplines, including microbiology, metallurgy, electrochemistry, and surface chemistry. Several myths related to MIC that make proper interpretation even more complicated are reviewed here. The follow…
Abstract Experimental alteration of obsidian was performed in 0.001 to 0.5 N NaOH and KOH solutions at 150 and 200 °C for 1 to 30 d. The products were examined by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive X-ray analysis (EDX). Chan…
Summary To understand the contribution of non exchangeable potassium to plant nutrition the release and fixation of K was studied on a range of soil samples of varying K status, obtained from a long‐term fertilizer trial. The soil samples were either air‐dried or not prior to use so as to determine the influence of pr…
A cosmid containing a wild-type Anabaena PCC 7120 DNA fragment was found to suppress heterocyst differentiation, creating a Het phenotype in an otherwise wild-type strain. Curing of the cosmid restored the full wild-type Het+ Nif+ phenotype. The cosmid contains at least four genes encoding proteins with significant se…
New structural systematics of the high-pressure phases of the title elements are given on the basis of the results obtained in our diffraction studies and the results from the literature. Although the structural transition sequence with increasing pressure appears to be different for the four elements, reinterpretatio…
High purity, high cubicity aluminum foils were electrochemically etched in HCl‐based etchants at constant anodic current density to produce etch tunnels. Tunnel widths were measured as a function of the etching depth, for temperatures in the range 60 to 95°C and HCl concentrations in the range 0.1 to 9 N . The effect…