Materials Literature
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Thermal diffusivity of the composites of camphor sulphonic acid (CSA) doped polyaniline (PANI) and its composites with cobalt phthalocyanine (CoPc) has been measured using open cell photoacoustic technique. Analysis of the data shows that the effective thermal diffusivity value can be tuned by varying the relative vol…
Sequentially spectrophotometric titrations by sodium hydroxide of meso-tetraphenylporphyrin derivatives bearing one, two, three, or four p-hydroxyl groups result in new types of spectra. The strong new bands appear in the visible region with splitting or broadening of the Soret band and its significant loss of oscilla…
High-pressure electrical conductivity experiments have been performed on the Mott insulator $\mathrm{MnO}$ to a maximum pressure of $106\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. We observe a steady decrease in resistivity to $90\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$, followed by a large, rapid decrease by a factor o…
Infrared transmission and Raman scattering have been used to study Raman active phonons and crystal-field excitations in Yb 3+ -doped yttrium, lutetium and scandium orthosilicate crystals (Y 2 SiO 5 (YSO), Lu 2 SiO 5 (LSO) and Sc 2 SiO 5 (SSO)), which belong to the same C 2h 6 crystallographic space group. Energy leve…
Flavodoxins are involved in a variety of electron transfer reactions that are essential for life. Although FMN-binding proteins are well characterized in prokaryotic organisms, information is scarce for eukaryotic flavodoxins. We describe the 2.0-A resolution crystal structure of the Saccharomyces cerevisiae YLR011w g…
The pressure-induced phase transition in silicon carbide is studied using a constant-pressure ab initio technique. The reversible transition between the zinc-blende structure and the rock-salt structure is successfully reproduced through the simulation. The transformation mechanism at the atomistic level is characteri…
Ultrathin nickel oxide films were grown on the Ag(001) surface by evaporation of Ni in an O 2 atmosphere. The growth mechanism, composition, and structure of the NiO layers formed in the early stages of deposition have been investigated by LEIS, XPS, XPD, and LEED. We found that at O 2 pressures in the 10 -7 − 10 -6 m…
A triad consisting of a carotenoid (C), a dimesitylporphyrin (P), and a tris(heptafluoropropyl)porphyrin (P F ), C−P−P F, has been synthesized and found to undergo rapid singlet−singlet energy transfer between the porphyrin moieties so that their excited states are in equilibrium. Photoinduced electron transfer from t…
Six clusters Ag(8)(micro(8)-X)[Se(2)P(OR)(2)](6)(PF(6)) (R = Et, X = Cl, 1a, X = Br, 1b; R = Pr, X = Cl, 2a, X = Br, 2b; R = (i)Pr, X = Cl, 3a, X = Br, 3b) were isolated from the reaction of [Ag(CH(3)CN)(4)](PF(6)), NH(4)[Se(2)P(OR)(2)], and Bu(4)NX in a molar ratio of 4:3:1 in CH(2)X(2). Positive FAB mass spectra sho…
Nanowire-like iron oxides (α-Fe 2 O 3 , Fe 3 O 4 and γ-Fe 2 O 3 ) of diameter about 200 nm and length up to 8 µm were assembled into anodic aluminium oxide templates through electrodeposition followed by a heat-treating process. These wires have polycrystalline structures and consist of fine particles whose magnetic m…
Deposits of β and α RDX on glass substrates have been examined with optical and Raman microscopy. The measurements reveal significant differences in the morphology and Raman spectra of β and α RDX. Structures that resemble an island, as well as scattered particles, are observed in white light images of β RDX. Well-def…
UDP-galactose 4'-epimerase (GALE) interconverts UDP-galactose and UDP-glucose in the final step of the Leloir pathway. Unlike the Escherichia coli enzyme, human GALE (hGALE) also efficiently interconverts a larger pair of substrates: UDP-N-acetylgalactosamine and UDP-N-acetylglucosamine. The basis of this differential…
The photoluminescence properties of ZnO:N films fabricated by thermally oxidizing Zn3N2 films using plasma-assisted metal-organic chemical vapour deposition, D Wang, Y C Liu, R Mu, J Y Zhang, Y M Lu, D Z Shen, X W Fan
10.1021/la049610t
In this communication, gold nanoparticles with a tadpole shape were synthesized by a simple aqueous-phase chemical method. The unusual three-dimensional and crystallized structures were demonstrated by TEM, AFM, and HRTEM methods. The SEM and UV-visible absorption measurements and electrophoresis experiments revealed…
The preparation of nanocomposite materials from carbon nanotubes (CNTs) and metal or metal oxide nanoparticles has important implications to the development of advanced catalytic and sensory materials. This paper reports findings of an investigation of the preparation of nanoparticle-coated carbon nanotube composite m…
Room-temperature reactions of 46 different atomic cations with N 2 O have been surveyed systematically using an inductively coupled plasma/selected-ion flow tube (ICP/SIFT) tandem mass spectrometer. The atomic cations are produced at about 5500 K in the ICP source and are allowed to decay radiatively and thermalize by…
Electron energy-loss spectrometry was employed to measure the white lines at the ${L}_{2,3}$ absorption edges of the $3d$ transition-metal oxides and lithium transition-metal oxides. The white-line ratio $({L}_{3}∕{L}_{2})$ was found to increase between ${d}^{0}$ and ${d}^{5}$, and decrease between ${d}^{5}$ and ${d}^…
We investigate the depinning transition occurring in dislocation assemblies. In particular, we consider the cases of regularly spaced pileups and low-angle grain boundaries interacting with a disordered stress landscape provided by solute atoms, or by other immobile dislocations present in nonactive slip systems. Usin…
Bravais' rule, of wide validity for crystals, states that their surfaces correspond to the densest planes of atoms in the bulk. Comparing a theoretical model of icosahedral Al-Pd-Mn with experimental results on sputter-annealed surfaces, we find that this correspondence breaks down, i.e., the surfaces parallel to the…