Materials Literature
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Signal transduction ATPases with numerous domains (STAND), a large class of P-loop NTPases,1 belong to AAA+ ATPases.2-4 They include AP(apoptotic)-ATPases5 (e.g., animal apoptosis regulators CED4/Apaf-1, plant disease resistance proteins, and bacterial AfsR-like transcription regulators), NACHT NTPases6 (e.g. CARD4, N…
We show that reflection of a monochromatic light from a semi-infinite medium covered with a stack of layered media is equivalent to that from an effective "semi-infinite medium" characterized by two distinctive optical dielectric constants for the s-polarized and p-polarized components, respectively. Such an effective…
OBJECTIVE: Magnetic drug targeting may be a new method for the treatment of malignant tumors. According to the previous investigations, the success of magnetic targeting is generally contingent upon the magnetic properties and size distribution of the magnetic nanoparticles. Therefore, the aim of the present study was…
In this paper, we present a theoretical study based on DFT methods using functionals implemented in Gaussian03, to obtain geometry optimizations, harmonic frequencies, IR intensities and Raman scattering activities of the triad [Ni(tdas)2]z [z = 0 (); z = 1- (); z = 2- ()] and of [Au(tdas)2]- (3) with the aim of eluci…
We report on the aggregate structure of a symmetrical A-B-A 9,9-dialkylfluorene/2-alkylaniline "coil-rod-coil" triblock copolymer (or PF/PANI11112-b-PANI11)--consisting of 2-dodecylanilines as A blocks and 9,9-di(3,7,11-trimethyldodecyl)fluorene)s as B blocks--mixed in deuterated toluene, chloroform, and methylcyclohe…
The methyl groups of [Cu2(2,5-dimethylpyrazine)(N3)4]n, 1, force penta-coordination on the Cu(II) ions, which, together with the di-µ-1,1azido zigzag chains, result in a (6,3) 2D net with dominant ferromagnetic interactions.
Abstract The crystal structures of five intercluster compounds consisting of gold clusters and Keggin anions have been determined by single‐crystal x‐ray diffraction: [Au 9 (PPh 3 ) 8 ][PMo 12 O 40 ] ( P 4/ n , Z = 2, a = 24.0195(13), c = 13.6818(10) Å), [Au 9 (PPh 3 ) 8 ][HSiMo 12 O 40 ] ( P 4/ n , Z = 2, a = 24.270(…
Abstract BACKGROUND: The introduction of protein into polyacrylonitrile artificial muscle systems has been shown to be a good way to achieve quicker and better responses. This research work mainly focused on the structure and dynamic pH response of hybrid hydrolyzed polyacrylonitirile‐ blend ‐soy protein (H‐PAN/SP) hy…
A comprehensive theoretical model for the bulk manganite system ${\text{La}}_{1\ensuremath{-}x}{(\text{Ca},\text{Sr})}_{x}{\text{MnO}}_{3}$ is presented. The model includes local and cooperative Jahn-Teller distortions and the on-site Coulomb and exchange interactions. The model is solved in the single-site dynamical…
The interaction between a phase separated polymer network and a liquid crystal was studied across the smectic-A* (Sm-A*) to smectic-C* (Sm-C*) phase transition of a polymer-stabilized ferroelectric liquid crystal polymerized in the Sm-A* phase. Using precise measurements of the tilt angle and the spontaneous polarizat…
Abstract This work investigates the evolution of the rheological properties of elastomeric dynamically vulcanized ethylene‐α‐olefin copolymers (ECs) and their blends with polypropylene (PP), during peroxide initiated crosslinking. Rheological techniques are used in conjunction with gel content measurements to determin…
An ultra-thin layer of V has been coated onto the surface of individual Mg nanoblades by dynamic shadowing growth. This 2.25 at% V decorated Mg nanoblade array can absorb and desorb hydrogen rapidly at temperatures T>or= 500 K after activation by one hydrogen cycle, with a low hydrogen absorption activation energy of…
A basic assumption of tiling theory is that adjacent tiles can meet in only a finite number of ways, up to rigid motions. However, there are many interesting tiling spaces that do not have this property. They have 'fault lines', along which tiles can slide past one another. We investigate the topology of a certain cla…
A series of mesoporous aluminosilicate and borosilicate molecular sieves with the MCM-41 structure have been synthesized with different SiO 2 /Al 2 O 3 or SiO 2 /B 2 O 3 mass ratios of 5, 10, 25, 50, 70 and 150. The samples were synthesized using the direct method with a duration of 48 h. As silica source colloidal si…
Fabrication of high-purity double-wall carbon nanotubes (DWNTs) with purity more than 95% has been achieved by developing synthetic and purification methods. High-temperature pulsed arc discharge (HTPAD) is used to synthesize DWNTs with controlled combinations on catalysts of transition metals (Ni/Co/Fe) and rare eart…
Abstract This article deals with the characterization of high trans ‐1,4‐poly(butadiene) (TPBD) prepared by means of an anionic polymerization using an initiator composed of alkyl aluminum, n ‐butyl lithium, and barium alkoxide. By controlling both initiator composition and polymerization temperature, a set of TPBD wa…
Investigations of the electrical resistivity of liquid Sn–20 wt-%Sb alloy as a function of temperature were carried out by dc four probe method. An abnormal change on the resistivity–temperature curve was observed in temperature interval of 850–980°C, which indicated that temperature induced liquid–liquid structure tr…
In order to explore the feasibility of using quantum dots (QDs) as nanodiagnostic tools in cells under oxidative stress, the interaction of cysteine-functionalized CdTe QDs with peroxynitrite (PN), a powerful biological oxidant, was spectroscopically investigated. The photoluminescence (PL) of CdTe QDs was quenched to…
Atomic-level dynamics of Joule heating, melting and plastic dynamics at loaded nanometer-scale Cu and Al asperity contacts are modeled using an ad hoc coupling between a numerical solution to a heat transport equation, a virtual resistor network for describing electric current flow and a molecular dynamics simulation…
Abstract The mechanisms behind the load building capabilities of a hyperbranched polymer (HBP) in polyurethane (PU) foams have been investigated, using microscopy techniques and mechanical analyses. By broadening the traditional uniaxial compression characterization of PU foams to include combined shear deformations a…