Materials Literature
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Recently, a new orthorhombic phase has been discovered in the ferroelectric system $(1\ensuremath{-}x)\mathrm{Pb}({\mathrm{Zn}}_{1/3}{\mathrm{Nb}}_{2/3}){\mathrm{O}}_{3}\ensuremath{-}x{\mathrm{PbTiO}}_{3}$ $(\mathrm{PZN}\ensuremath{-}x\mathrm{PT})$ for $x=9%,$ and for $x=8%$ after the application of an electric field.…
We present fluorescence decay measurements of single ZnS covered CdSe nanocrystals. It is shown that the fluorescence decay time is fluctuating during the investigation leading to a multiexponential decay even for a single nanocrystal. In combination with measurements of the fluorescence blinking behavior we find that…
The biodegradative behaviors of composite films of ultrahigh molecular weight polyethylene (UHMWPE) (6×106) and starch (ST) particles were investigated. The films were prepared by gelation–crystallization from dilute solutions of PE, in which ST particles were dispersed. The PE–ST compositions chosen were 3/1, 1/1, 1/…
In this work, we report the synthesis and a study on the degree of electronic delocalization in the asymmetric mixed valence complexes [CpFe(C(8)H(6))Fe(C(8)H(7))](+), 3a(+), and [CpCo(C(8)H(6))Fe(C(8)H(7))](+), 3b(+), (Cp = C(5)Me(5), C(8)H(6) = pentalenyde, C(8)H(7) = hydropentalenyde, and = ((3,5(CF(3))(2)C(6)H(3))…
Abstract We synthesized a new weakly interacting monomer with a reactive phenylsilane group that is an intermediate for many functional groups. The synthesis was performed in two steps: the hydrosilylation of 1,7‐octadiene with dimethylchlorosilane and a Grignard reaction with phenyl magnesium bromide. The new monomer…
Abstract Thermoplastic elastomers require domains that act as physical crosslinks, and these can be either glassy regions or crystallites. For crystallites in a polymer such as polypropylene (PP), the challenge is to develop polymerizations that form the long stereoregular chain sequences required to produce crystalli…
Adsorbate binding energy and adsorption capacity of xenon on carbon nanohorns, A J Zambano, S Talapatra, K Lafdi, M T Aziz, W McMillin, G Shaughnessy, A D Migone, M Yudasaka, S Iijima, F Kokai, K Takahashi
X-ray diffraction (XRD) methods and differential scanning calorimeter (DSC) thermal analysis have been used to investigate the structural changes of polyamide 6 (PA 6)/clay and polyamide 6,6 (PA 6,6)/clay nanocomposites. Polyamide 6/clay was prepared by the intercalation of ε-caprolactam and exfoliation of the layered…
In this study the tensile and the dynamic-mechanical behavior of injection-molded samples of various soy protein thermoplastic compounds were evaluated as a function of the amount of glycerol, type and amount of ceramic reinforcement, and eventual incorporation of coupling agents. The incorporation of glycerol into a…
The synthesis of tetra- p -anisyl- p -phenylenediamine (TAPD, 1 ) and its derivatives containing appended diarylamino (AA) redox groups (2AA/PD, 2 and 4AA/1PD, 3 ) is presented. Such mixed redox arrays are of interest in a materials context for their projected directional electron transport properties and potential ch…
Abstract We have discovered that pentamethylcyclopentasiloxane (D 5 H) can be readily polymerized into poly(pentmethylcyclopentasiloxane) (PD 5 ) with a Pt (Karstedt) catalyst in the presence of water in bulk or in solution at 100 °C and that the product is a solid with extraordinary properties. The polymerization sta…
A series of novel regenerated cellulose (RC) films was prepared from cotton linters in 6 wt% NaOH/4 wt% urea aqueous solution by coagulating with 1–20 wt% sulfuric acid (H2SO4) aqueous for 1–20 min. Dependences of structure, morphology, light transmittance, mechanical properties, and water permeability of the films on…
Abstract In the cast film process a polymer melt is extruded through a slit die, stretched in air, and cooled on a chill roll. During the path in air the melt cools while being stretched. Film casting experiments were carried out with an isotactic polypropylene resin. The temperature and width distributions were measu…
This paper examines the catalytic function of the protein YbgC, encoded by the ybgC gene of the tol-pal gene cluster in Haemophilus influenzae. The YbgC protein, a homologue of the Pseudomonas sp. strain CBS3 4-hydroxybenzoyl-coenzyme A thioesterase, conserves the active site Asp residue associated with thioesterase a…
A charge-density study of the nonlinear-optical (NLO) precursor {4-[bis(diethylamino)-methylium] phenyl}dicyanomethanide (DED-TCNQ), space group ${P2}_{1}/c,$ $a=11.174(2)\AA{};$ $b=12.859(2)\AA{};$ $c=12.486(2)\AA{};$ $\ensuremath{\beta}=112.00(1)\ifmmode^\circ\else\textdegree\fi{},$ is presented. The results derive…
We report a comprehensive study on the adsorption of Cl on the clean rutile ${\mathrm{TiO}}_{2}$ (110) $(1\ifmmode\times\else\texttimes\fi{}1)$ surface. STM and photoemission spectroscopy results are compared to ab initio results. At room temperature, Cl adsorbs dissociatively and binds to the fivefold coordinated Ti…
Abstract Fibrous cellulose and maleated polyethylene (FC–MPE) composites were prepared under melt mixing by maleation of polyethylene (PE) to obtain maleic anhydride (MA) grafted PE (MPE) and successive compounding of the resultant MPE with fibrous cellulose (FC). When increasing the content of added MA to 2 wt %, the…
Genetic experiments in bacteria have shown the suf operon is involved in iron homeostasis and the oxidative stress response. The sufB and sufC genes that always occur together in bacteria are also found in plants, and even the malaria parasite, associated with the plastid organelle. Although the suf operon is believed…
The first integrally oxidized metal-free phthalocyanine compounds have been synthesized by chemical oxidation. Phthalocyanine (H(2)(pc), pc = phthalocyaninato) was oxidized with IBr to afford the compounds [H(2)(pc)][IBr(2)] (1) and [H(2)(pc)](2)[IBr(2)]BrAC(10)H(7)Br (2), whose structures were determined by means of…
We studied phase stability, structural properties, and electronic band structures of graphite fluorides ${\mathrm{C}}_{n}\mathrm{F}$ $(n=1,2,\dots{},6)$ using density-functional theory with local density approximation. The calculation shows that ${\mathrm{C}}_{n}\mathrm{F}$ with ${\mathrm{sp}}^{3}$ bonding has a direc…