Materials Literature
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Sexual reproduction in the domoic acid–producing pennate diatom Pseudo-nitzschia multiseries (Hasle) Hasle is dioecious and involves pairing of two morphologically isogamous parent cells (gametangia) and the production of two gametes per gametangium. Gamete fusion leads to the formation of zygotes, which elongate into…
A novel AB2 monomer, 4-(fluorophenyl)-4′,4″-(bishydroxyphenyl) phosphine oxide, was synthesized. The monomer was successfully polymerized to a modest molecular weight with various catalysts, including K2CO3 and Cs2CO3/Mg(OH)2. Hyperbranched polymers exhibited exceptionally high thermal stability and solubility in conv…
Porous germanium (PG) is prepared by a novel bipolar electrochemical etching (BEE) technique; scanning electron microscopy (SEM) clearly reveals formation of a porous layer up to a few microns thick that is Ge–Hx terminated as indicated by FTIR spectroscopy; the hydride terminated PG material is quite resistant to oxi…
Sulfonated polyanilines (SPANs) with sulfur-to-nitrogen ratios of 0.05–0.40 were prepared by the copolymerization of aniline (ANI) and 3-aminobenzenesulfonic acid [metanilic acid (MA)] with ammonium peroxodisulfate in 1 M HCl at various MA/ANI and oxidant/monomer ratios and temperatures. The SPANs degree of oxidation,…
The solid surface tension γsv of hydrophobic polymer powders has been determined using the capillary penetration technique. By plotting Kγlv cos ζ, where K is a geometric factor, versus the liquid surface tension γlv, the following values of γsv were directly derived from the curves: poly(tetrafluoroethylene) γsv = 20…
Templated silicate molecular sieves exhibiting templated super-micropores in the range 1.0–2.0 nm and interesting pore symmetries bearing similarity to the Lα, SBA-2 (P63/mmc) and Mα (cmm) phases have been prepared by exploiting the novel aggregation properties of a new family of ω-hydroxyalkylammonium bolaform surfac…
The infrared spectrum of the water–hydrogen peroxide complex was studied in argon matrices. The complex is cyclic, with each molecule acting both as a hydrogen bond donor and a hydrogen bond acceptor. The assignment is supported by experiments with combinations of completely and partially deuterated hydrogen peroxide…
The title bis(imidazol-4-yl)porphyrin 1 gave supramolecular assemblies through hydrogen bonding; efficient excited energy transfer followed by electron transfer to quenchers has been observed in toluene.
Polymer-dispersed liquid crystal (PDLC) films were synthesized by the copolymerization of liquid crystalline polymer (LCP) precursor, urethane acrylate (UA), and mesogenic monomer (AI) at different conditions. The morphology of polymer matrix changed with the weight ratio of polymer/liquid crystal (LC) ratio and curin…
The overall quantum yields for phenanthridinium sensitised emission from a europium ion have been measured in H2O and D2O for a series of five structurally related, octadentate ligands in which the distance from the phenanthridinium chromophore to the Eu ion varies from 2.5 to ca. 8.2 Å. Overall quantum yields (pD⩽2)…
The effect of different tetravalent octahedral‐site substitutions (M 4+ = Zr, Tb, and Ce) on the stability of the 1:1 chemically ordered phase in Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) relaxor ferroelectrics were investigated using X‐ray diffractometry and transmission electron microscopy. In their as‐sintered form, all the samp…
Radiolabeled ([3H]cholesteryloleyl ether) immunoliposomes directed against rat colon adenocarcinoma CC531 cells were prepared by random coupling of a tumor cell-specific antibody, CC52, via a thio ether bond. In vitro binding experiments demonstrated a saturable and specific interaction of CC52-immunoliposomes, which…
The preparation and characterization of novel piezoelectric and pyroelectric electrets is discussed with respect to their electret properties. Charged heterogeneous electrets, like closed-cell microporous polypropylene (pp) foams and 'soft-hard' fluoropolymer hybrids are shown to yield large quasi-static and dynamic p…
In this paper, the results of an experimental project on insulating material aging, performed in both Denmark and Italy, are reported. This study was concerned with partial discharge (PD) behavior at temperatures between 30 and 80/spl deg/C using CIGRE method II. The material tested was a commercial polymethylmethacry…
Description STP 1366, the nineteenth volume in this series, examines 90 peer-reviewed papers from the international nuclear community, with the emphasis on advanced materials such as silicon carbide and vanadium alloys. A majority of the papers are devoted to pressure vessel embrittlement and its mitigation. Smaller s…
[Fe(hyptrz)3]A2·H2O (hyptrz = 4-(3′-hydroxypropyl)-1,2,4-triazole and A = 4-chlorobenzenesulfonate) represents a novel iron(II) polymeric chain compound. A discontinuous spin transition has been observed by temperature dependent magnetic susceptibility measurements. The spin transition curves are shifted from 181 K to…
Complexation of hydrated Cu(BF4)2 by 2 molar equivalents of L2R (L2Me = 2,6-bis{methyliminomethyl}pyridine, L2Cy = 2,6-bis{cyclohexyliminomethyl}pyridine, L2But = 2,6-bis{tert-butyliminomethyl}pyridine) afforded [Cu(L2R)2][BF4]2 (R = Me, 1; Cy, 2; or But, 3) in moderate yields. EPR spectroscopy in solution and the sol…
Study of melts rheological properties of unvulcanized and dynamically vulcanized polypropylene (PP)/ethylene-propylene-diene rubber (EPDM) blends, at blending ratios 10–40 wt %, EPDM, are reported. Blends were prepared by melt mixing in an internal mixer at 190°C and rheological parameters have been evaluated at 220°C…
A new type of silicomolybdate–methylsilicate–graphite composite material was prepared by the sol–gel technique and used for the fabrication of an amperometric nitrite sensor. The silicomolybdic anion acts as a catalyst, the graphite powder ensures conductivity by percolation, the silicate provides a rigid porous backb…
Surface modification of poly(ethylene terephthalate) (PET) film by an argon (Ar) plasma was investigated as a function of the distance from the Ar plasma zone. Changes in distance between the PET film and the Ar plasma zone had a strong influence on the surface modification of the film. The direct Ar plasma treatment…