Materials Literature
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The defocused beam (or broad beam) technique of bulk-compositional analysis has a bad reputation, and deservedly so. Many literature analyses based on DBA are grossly inaccurate, typically showing erroneously high Al, and low Fe, Mg and Ti. The only widely cited correction methods for DBA [1,2] are completely inadequa…
Single-crystal X-ray structures have been determined for the difluoro(porphyrinato)silicon(IV) complexes trans-(Por)SiF(2) (Por = the dianions of tetra-p-tolylporphyrin (TTP) and tetrakis(p-(trifluoromethyl)phenyl)porphyrin). Crystallographic data for (TTP)SiF(2).Et(2)O: monoclinic, space group C2/c, a = 30.228(4) Å,…
Sputtered gold films in a pure form or as nanocomposites in silica or silicon nitride were screened for surface-enhanced Raman scattering (SERS) activity using Rhodamine 6G as a probe. The films were prepared by sputtering pure gold or solidified Au–Si alloys in plasmas generated in a dc glow discharge apparatus. The…
Abstract The adhesive properties of a new family of crosslinkable aromatic copolyester resins are described in this paper. A unique method for forming an adhesive bond in the solid state through high temperature interchain transesterification reactions (ITR) between cured thin films of these copolyester thermosets is…
Abstract The influence of eolian dust deposition on the development of Red‐Yellow soils and nonallophanic Andisols in Japan has been well documented. In these studies, it was reported that the clay fractions of these soils are dominated by fine‐grained quartz, 2:1 layer silicates and their intergrades, and kaolinite.…
Studies have been performed on a series of La-modified lead zirconate titanate (PLZT) specimens with grain sizes between 0.6 and 6 μm by dielectric spectroscopy and transmission electron microscopy. These investigations have revealed an increase in the degree of relaxor characteristics with decreasing grain size for t…
Results are presented for high-pressure, isothermal studies of the low-frequency nonlinear dielectric effect (LF NDE) in the isotropic phase of n-octylcyanobiphenyl (8CB, isotropic-nematic liquid crystal phase transition) and n-dodecylcyanobiphenyl (12CB, isotropic--smectic-A phase transition). In both cases a linear…
Phonons in bcc Mo, Fe, and Cr have been calculated using embedded-atom-method (EAM)-type and embedded-defect (ED) potentials. The latter is an extension of the EAM that introduces angular interactions through a many-body approach. In contrast with the EAM formalism, the ED calculated elastic constants can be fitted to…
ABSTRACT The sorption of hexyl acetate and ethyl butyrate into polypropylene from vapors and 40% ethanol solution was studied. The effect of concentration and interactions with co‐sorbants was investigated. The vapors were sorbed in amounts that were related to feed concentrations, without any interactive effects of c…
Branched poly(ethylene terephthalate)s (PET) were synthesised with a variety of molar masses and with a large range of degree of branching by introduction of mono-, tri-(glycerol) and tetra-functional (pentaerythritol) comonomers to dimethyl terephthalate and ethylene glycol. The monofunctional alcohols, dodecanol and…
Surfactant adsorption in porous silicon films formed by anodic oxidation of bulk p-type silicon in HF solution was studied by spectroscopic ellipsometry. The cationic surfactant cetyltrimethylammonium bromide reversibly adsorbed in the films from aqueous solutions. No adsorption of sodium dodecyl sulfate was observed.…
Water sorption and transport properties for a series of miscible blends of hydrophobic bisphenol A polysulfone and hydrophilic poly(vinyl pyrrolidone) are reported. Study was restricted to blends that remained homogeneous after exposure to liquid water. The solubility of water in the blend films increased with increas…
A series of monocationic lanthanide complexes containing the ligand N,N'-bis(2-pyridylmethyl)ethylenediamine-N,N'-diacetate(2-) (bped(2)(-)) have been prepared and isolated as either the hexafluorophosphate or perchlorate salts. The complexes have been characterized by (1)H and (13)C NMR, +LSIMS, IR, and elemental ana…
A new preparation of N,N'-bis(2-pyridylmethyl)ethylenediamine-N,N'-diacetic acid (H(2)bped) is reported, and its properties of complexation with Al(III), Ga(III), In(III), and Co(III) are investigated. The molecular structure of the cobalt(III) complex [Co(bped)]PF(6).CH(3)CN.H(2)O (C(20)H(25)CoF(6)N(5)O(5)P) has been…
Abstract The high real-space resolution of neutron diffraction experiments which is provided by use of the epithermal neutrons from spallation sources was exploited in order to differentiate the unlike P-O bonds existing in the PO 4 units of phosphate glass networks. The 2 P-O distance peaks, separated by about 12 pm,…
This contribution explores the first electronic hyperpolarizabilities β of the heterocyclic pyridinium betaines consisting of a negatively charged aromatic electron-donating group and a positively charged aromatic electron-withdrawing group. On the basis of enhanced charge separation between the pyridinium and benzimi…
Details of the transitional properties of four homologous series of U-shaped liquid crystal materials, the benzene-1,2-di-(4-carboxyalkoxybenzylidene-4-n-alkylanilines), are presented. The spacers incorporate 3 to 6 methylene units, whilst terminal aliphatic chain lengths are varied from 1 to 12 units. Members of the…
The molecular and crystal structure of a chiral diamino-substituted dicyanoquinodimethane and the observation of strong solid-state optical second harmonic generation (SHG) in this material are reported. The enhanced SHG was obtained by exploiting the strong influence of the rigidity of the stereogenic center environm…
BPL porous carbon is oxidized anodically, and the properties of the oxidized carbons are compared with those of chemically oxidized samples. An interpretation of the results of programmed thermal desorption, base uptake, and heat of neutralization experiments is made, based on the assumed presence of lactonic and acid…
We have measured frequencies of all internal and external modes in natural and 32 S isotopically pure oriented orthorhombic single sulfur crystals using high-resolution Raman and FTIR spectroscopy. Polarized spectra at low temperatures deliver mode frequencies and allow mode assignment to vibrational, librational, and…