Materials Literature
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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…
Polyaniline/crosslinked cellulose conductive interpenetrating polymer networks (IPNs) were prepared by oxidative polymerization of aniline within the self-synthesized cellulose network using ammonium persulphate as oxidant. The conductivity of the IPN increases and then decreases with decrease in the aniline/(NH4)2S2O…
In a search for a generic synthesis methodology to produce microporous, nonoxide ceramics, pyrolysis of silicon-based preceramic polymers has been studied in inert (He or Ar) and reactive (NH 3 ) atmospheres over the temperature range 25−1300 °C. Pyrolysis of polysilazanes in an inert atmosphere in the absence of addi…
This paper discusses a novel plasma‐spraying process for depositing dense LaCrO 3 ‐based interconnection for solid oxide fuel cells (SOFCs). Calcium aluminate was mixed with LaCrO 3 in a slurry containing PVA binder and spray dried to form free‐flowing agglomerates. These free‐flowing agglomerates were plasma sprayed…
Among the large number of processes parameters in Carbon Black (CB) manufacturing, temperature is certainly one of the most important. Whatever the process and the feedstock are, all the processes have in common a limited temperature, as a result of the feedstock energy contain. In the first part of this paper, we est…
OBJECTIVE: The success of liposome-based drug delivery systems for tumor targeting relies on maximum extravasation of liposomes into tumor interstitium, as well as optimal release of contents from the liposomes once within the tumor Liposome extravasation and content release are two separate processes that can be indi…
The beneficial effect of the presence of Bi atoms on the rechargeability of can be explained through a reaction viewpoint. Bi(III) and Mn(X) atoms (X = IV, III, or II) give stable complexes. Furthermore, the formation of can be viewed as a stepwise 3D polymerization, i.e. , as a reaction chain composed of basic additi…
Abstract The kinetics of crystallization have been studied for a series of novel poly(ether ether sulfide)s based on a biphenyl moiety in the backbone ( M n = 14.3K, 19.1K), referred to as biphenyl sulfide ( T g = 142°C, T m = 347°C) and phenyl moieties in the backbone ( M n = 8.1K, 19.9K, 34K), referred to as phenyl…