Materials Literature
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It is proposed that melt-extrusion of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) at varying processing temperatures and screw speeds causes changes in the atomic positioning of the oxygen atoms in the helix structure due to torsion of the main chain bonds. By wide angle X-ray scattering it was observed that an incre…
The local structures of amorphous Ge0.52Te0.48 and Pd0.01Ge0.17Sb0.26Te0.56 were examined by extended x-ray absorption fine structure. In amorphous GeTe film, only Ge atoms were observed in the nearest-neighbor of Te atoms. The average coordination number around Te atoms in amorphous GeTe is 1.5 which is close to twof…
Photoablation of polyimide (Dupont Kapton™) and poly(ethylene terephthalate) (PET) (Dupont Mylar™) were studied in vacuum using 248 nm, 16 ns excimer laser pulses. A sensitive electron beam ionizer/quadrupole mass spectrometer detector was used to measure mass, translational energy, and angular distributions of the ne…
Optically reflective composite polyimide films have been prepared by casting a dimethylacetamide solution of silver(I) acetate, hexafluoroacetylacetone, and the poly(amic acid) derived from 3,3‘,4,4‘-benzophenone tetracarboxylic acid dianhydride (BTDA) and 4,4‘-oxydianiline (4,4‘-ODA) onto an fully imidized parent BTD…
The following article is Part II of a three-part series on the use of polymer insulating materials in outdoor insulation applications. Despite three decades of service history, polymer insulation materials do not have the same level of standardization as porcelain. As with any technology that is not well standardized,…
Abstract The interactions between carbon layers and lithium atoms are described with a semiempirical molecular orbital method in order to clarify the Li storage mechanism in amorphous carbon (a-C) materials used in Li ion rechargeable batteries. The general electronic and geometric structures of Li-doped a-C materials…
Abstract The reactions of 2-phenylbenzothiazoline with [M(CH3COO)2]·4H2O (M = Co(II) and Ni(II)) afford the complexes [M(phbt)2 ] (phbt = 2-(phenylmethyleneamino)benzenethiolato) via a ring opening reaction of 2-phenylbenzothiazoline. Spectroscopic data indicate that the cobalt and nickel atoms occupy a tetrahedral an…
Abstract Octa‐ tert ‐butylphthalocyanina‐tonickel(II) ( 4 ) was synthesized from 3,5‐di‐ tert ‐butylphthalonitrile ( 1 ) and nickel acetate. A nonstatistical mixture of the four structural isomers 4a–d was obtained. The isolation of the structural isomers 4a–d by preparative HPLC (MPLC) allowed their unequivocal ident…
Summary: The starvation-stress response of Vibrio (Listonella) anguillarum was investigated and characterized with regard to changes in cell morphology and the ability of V. anguillarum to survive starvation, heat shock, exposure to H 2 O 2 and exposure to ethanol. The ability of V. anguillarum to survive exposal to t…
In order to improve our understanding of the link between the cyclic deformation of single crystals and of polycrystalline materials, a study was performed on copper bicrystals. Testing under strain control within the high cycle regime was performed in isoaxial [149] (90° and 180°) twist boundaries and [149]/[001] bic…
A structural analysis of the so-called smectic Q mesophase was performed on nine different chiral compounds. Not less than four different structures were observed, and they all belong to the crystal of defects class. The defects of the liquid crystalline organization are stacked in three dimensional crystalline lattic…
A systematic study of the promoting effect of various elements on crystallization and texture of tungsten sulfide (WS2) thin films is presented. Best crystallization at relatively low annealing temperatures Ta=650–750 °C is achieved by adding sodium sulfide or nickel to the film, while the strongest texture is achieve…
[MnOEP][HCBD], a member of the metalloporphyrin family of donor-acceptor molecule-based magnets, consists of isolated ferrimagnetic chains of alternating $S=2,$ [MnOEP], and $s=1/2,$ [HCBD] units ($\mathrm{O}\mathrm{E}\mathrm{P}=\mathrm{o}\mathrm{c}\mathrm{t}\mathrm{a}\mathrm{e}\mathrm{t}\mathrm{h}\mathrm{y}\mathrm{l}…
Two experiments are reported which demonstrate the means to stabilize the photoluminescence from an electrochemically etched (100) Si surface (porous silicon). The strong stabilizing influence of small quantities of water on a nonaqueous [2 mol/ℓ HF in methylcyanide (MeCN)] etching process and the stabilizing effect o…
The hydrothermal reaction of V2O5, CuO, 2,2′bipyridine, H3PO4, n-Bu4NOH, and H2O in the mole ratio 1.0:0.86:2.05:3.54:1.40:449 at 160°C for 46 h yields [(VO2)2(HPO4)(2,2′-bipy)2]·H2O (1). The binuclear species is constructed from two edge-sharing dioxovanadium(V) octahedra, exhibiting a {V2O4} core in the anti-coplana…
CuO/γ-Al 2 O 3 is confirmed as the most active catalyst among eight γ-Al 2 O 3 -supported single metal oxides for the destructive oxidation of (CH 3 ) 2 S 2 . To investigate the promoting effect, nine different metal oxides were separately added to CuO/γ-Al 2 O 3 . The experiments reveal MoO 3 as the most effective pr…
Whey protein isolate (WPI)-based coatings and distilled acetylated monoglyceride (AMG)-based coatings were evaluated for their ability to delay the oxidative rancidity of walnut pieces. Tocopherol (Toco) and ascorbyl palmitate (AP) were added to improve the performance of the coatings. Results indicate that, despite t…
This study was designed to evaluate the feasibility of applying locally delivered polylactic acid microspheres for drug delivery to the arterial wall. To study drug persistence, rhodamine-loaded microspheres were infused into one carotid artery of 14 rabbits and plain rhodamine solution into the other by using a porou…
The association of styrene−methyl methacrylate statistical copolymers in the selective solvent acetone (a thermodynamically good solvent for poly(methyl methacrylate and bad for polystyrene) was examined by static and dynamic light scattering methods. In dilute solutions, the dynamics was dominated by a single fast mo…
New methodology has been developed for the synthesis of so-called sapphyrins, pentapyrrolic “expanded porphyrins”. An efficient approach involving acid-catalyzed condensation of 1,19-diunsubstituted a,c-biladienes and 3,4-dialkylpyrrole-2-carbaldehydes eliminates the preparation of bipyrrolic intermediates and allows…