Materials Literature
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Abstract According to Lippmann (1977, 1982) wide compositional variations and excess enthalpies of mixing calculated with electrostatic models imply that clay minerals of variable composition are dis-equilibrium solids. However, recent ATEM analyses of illite samples indicate compositional homogeneity of single illite…
Abstract Polymide films made from diarylanhydrides with oxygen, carbonyl, and hexafluoroisopropylidene 6F bridging groups are photolabile when irradiated with unfiltered light from a medium‐pressure mercury lamp. The presence of oxygen is necessary to the photolytic degradation process, which results in the ultimate o…
RATIONALE AND OBJECTIVES: The authors investigated whether iron oxide particles can be used as a magnetic resonance imaging (MRI) contrast agent to image abscesses in a two-stage experimental design. METHODS: Human buffy coat was incubated with iron oxide particles of different sizes and coatings. Smears of the incuba…
The influence of redox site loading, supporting electrolyte concentration, pH, and temperature on the rate of homogeneous charge transport, characterized by , and the rate of heterogeneous electron transfer, characterized by the standard rate constant , has been examined for films on glassy carbon electrodes in sulfat…
Abstract Hydroxyaluminosilicate (HAS) ions prepared from hydroxy-Al (HyA) ions and orthosilicic acid at different NaOH/Al molar and Si/Al atomic ratios were fixed in the interlayer spaces of vermiculite (Vt). The electric charge and surface characteristics of HAS-Vt and HyA-Vt complexes formed were investigated in the…
SUMMARY A new three‐parameter function is proposed that improves the ‘classical’ power‐law function for background subtraction processing at low energy losses in electron energy‐loss spectroscopy. The variation of the edge integrals with the width of the pre‐edge window Γ is reduced by a factor of at least five (of in…
NiK-edge EXAFS and XANES and optical spectroscopy indicate strong differences in the Ni environments in glasses of feldspar stoichiometry, in relation to the polarizing power of the associated alkali. Mostly 4 Ni and coexisting 4 Ni and 5 Ni are found in K 2 NiSi 3 O 8 and NaNiSi 3 O 8 glasses respectively
The authors have developed a new method for the detection of AC dissipation in dielectric materials under high AC field. Using this technique, high-field dielectric loss properties and their relation to AC dissipation current of low-density polyethylene (LDPE) films are measured. Near room temperature, tan delta of a…
High-energy electron diffraction, X-ray powder diffraction and high-resolution electron microscopy have been used to investigate the crystallographic properties of non-stoichiometric LaNi5+x (0≤ × ≤0.4) and LaNi6-xCux (0≤ × ≤3.0) electrode materials, which are based on the CaCu5 structure type. Structural aspects with…
Abstract Metastable and isomorphous cobalt‐copper hydroxysalts with Co:Cu = 100:0, 70:30 and 50:50 atomic ratios have been prepared as precursors by coprecipitation at constant pH from solutions of cobalt and copper nitrates added to a solution of NaHCO 3 . Mixed oxides were obtained by decomposition of the precursors…
Abstract Advances in understanding the photophysics and photochemistry of transition metal complexes offer opportunities to utilize these materials as luminescence sensors and probes. However, heterogeneity has an enormous effect on luminescence, quenching, and photochemistry. An intimate understanding of the detailed…
Raman spectroscopy has been used to examine the connection between room‐temperature creep and stress‐induced phase transformations in TS‐Grade Mg‐PSZ. The in‐situ phase measurements obtained show that the tetragonal phase transforms to both the orthorhombic and monoclinic structures under stress. The effect of precipi…
Abstract The weathering of montmorillonite in the acid clay deposit at Itoigawa, Japan has been investigated by X-ray diffraction (XRD), infrared spectroscopy (IR) and scanning electron microscopy (SEM). In the lower, least weathered part of the deposit, weathering has occurred by the formation of minor amounts of hal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal stability of photochromic bis[(trifluoromethyl)thiazolyl]ethene derivativesSatoru Iwata, Yuji Ishihara, Chenq Ping Qian, and Kiyoshi TanakaCite this: J. Org. Chem. 1992, 57, 13, 3726–3727Publication Date (Print):June 1, 1992Publication History Published online1 May 2…
Abstract The dielectric β‐relaxation in poly(ethylene terephthalate) and ethylene isophthalate terephthalate copolyesters with various ethylene isophthalate contents was investigated over a wide range of frequencies. Isothermal spectra and normalized plots show that the dielectric β‐relaxation is characterized by the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBirefringence of amorphous polymers. 4. Large deformation of polystyrene near its glass transition temperatureHirotaka Okamoto, Tadashi Inoue, and Kunihiro OsakiCite this: Macromolecules 1992, 25, 13, 3413–3415Publication Date (Print):June 1, 1992Publication History Publishe…
Current trends in the electronics and optoelectronics industries involving computing, data processing, sensing and communications all point toward a continuing need for improved materials and new multifunctional structures. The continuing and unrelenting drive toward higher bit density and greater integration has led…
Three photolabile precursors of glycine containing a photosensitive 2-nitrobenzyl moiety attached to the amino group have been synthesized. When exposed to ultraviolet radiation between 308 and 350 nm, the compounds photolyze to release glycine, an important inhibitory neurotransmitter in the central nervous system. T…
Experiments on stored energy have been carried out for three types of cold rolled aluminium and copper characterised by different texture and structure. In the first type, the shear texture has been obtained in the surface layers of the examined materials rolled in one pass at a high l/h ratio (where l is the projecte…
A method of calculation was developed for evaluating the contributions of external (gamma) and internal (alpha) doses due to the natural radioactivity of building materials. The radionuclides examined are 40 K and members of the 235 U, 238 U and 232 Th radioactive decay chains. The method makes it possible to correlat…