Materials Literature
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A review of the potential toughening and failure mechanisms for ceramic laminate materials is presented. An integrated approach to the design of ceramic laminates incorporating biaxial residual stresses for specific applications is outlined. Restrictions placed on the laminate architecture to avoid spontaneous transve…
Abstract Pt/zeolite catalysts have high CO selectivity for preferential oxidation of CO (PROX). To clarify this reason, characterization of Pt/ZSM-5 catalysts with high and low selectivity was performed. It was found that the catalyst with high selectivity consists of small Pt particles supported in ZSM-5 pores, but a…
Abstract Ordered Tb3+-doped zinc oxide nanowire arrays embedded in anodic alumina membranes (AAM) were fabricated by an improved sol–gel method. They have hexagonal wurtzite structure with uniform diameter of about 30 nm and the Tb3+ ions occupy Zn sites or interstitial sites in the crystal. The emission spectra of Zn…
The effect of alkyl substituents on the four lowest vertical ionization energies of porphyrins is determined with ab initio electron propagator calculations on porphine and octamethylporphyrin. With the use of the partial third-order approximation, predicted ionization energies are in close agreement with recent photo…
Cd3[Si3O9] (tricadmium trisilicate) crystallizes in the monoclinic space group P21/c and is isotypic with the mineral parawollastonite, Ca3[Si3O9]-2M. The structure contains distorted CdO6 octahedra and SiO4 tetrahedra that are organized in unbranched dreier single chains with three SiO4 tetrahedra in the repeat unit.…
Rare earth cation segregation in magnesium aluminate spinel has been imaged and analysed in an aberration corrected scanning transmission electron microscope. The SuperSTEM at Daresbury Laboratory provided evidence for monolayer segregation of europium ions along grain boundaries in spinel. EELS spectra confirmed the…
Abstract Carbon micro-beads (CMB) with regular and perfect shape, high yields, and narrow size distributions were obtained via an ethanol-thermal reduction process in a stainless steel autoclave at 500 °C. In this process, LaNi5 alloy was used as a catalyst. The products were characterized with X-ray powder diffractom…
Raman and FT-IR spectra were employed to investigate the dispersion of molybdena on mixed TiO2 (rutile and anatase, signed as R and A) with different BET surface ratios of rutile/TiO2(R + A). The results showed that (1) molybdena would preferentially disperse on the rutile surface in mixed TiO2; (2) for MoO3/rutile wi…
Polyhydroxybutyrate (PHB) synthase catalyzes the polymerization of (R)-3-hydroxybutyryl-CoA (CoA = coenzyme A) into high molecular weight PHB. Recombinant wild-type (wt) class III synthase from Allochromatium vinosum (PhaCPhaE(Av)), antibodies to this synthase and to PHB, and [(14)C]hydroxybutyryl-CoA (HB-CoA) have be…
A systematic study of the synthesis and stereocomplexation of l -lactic acid and ricinoleic acid based copolyesters is reported. l -lactic acid and ricinoleic acid based copolyesters were synthesized by melt condensation and transesterification of high-molecular-weight poly(lactic acid) (PLA) with ricinoleic acid and…
We report the first high-frequency and -field electron paramagnetic resonance (HFEPR) study of a Mn(III) N-confused porphyrin (NCP) complex (NCP is also known as inverted porphyrin or 2-aza-21-carbaporphyrin). We have found a striking variation in the electronic properties of the S = 2 Mn(III) ion coordinated by NCP c…
The deformation process in copper and aluminium single crystals under shock loading is investigated using a multiscale model of plasticity that couples discrete dislocation dynamics and finite element analyses. Computer simulations are carried out to mimic loading condition of high strain rates ranging from 105 to 107…
Abstract The TiO2-hollow spheres with uniform shell and diameter have been synthesized using carbon sphere as template, which has abundant –OH groups in its surface hydrophilic layer, and the titanium source was modified into this layer by the covalent –O–Ti bonding.
Spark plasma sintering (SPS) is a consolidation technique that can combine high heating and cooling rates with a uniaxial applied pressure resulting in short processing time. SPS has been successful in producing ceramics with novel microstructures, which are often reported to have been produced at temperatures lower t…
We studied chemical reactions between ultrathin metal films (Al, Cr, Fe, Mo) and single-crystal oxides (SrTiO3 (100), TiO2 (110)) with X-ray photoelectron spectroscopy (XPS). The work function of the metal and the electron density in the oxide strongly influence the reaction onset temperature (T(RO)), where metal oxid…
A series of six new dyads consisting of a zinc or magnesium porphyrin appended to a platinum terpyridine acetylide complex via a para-phenylene bisacetylene spacer are described. Different substituents on the 4' position of the terpyridinyl ligand were explored (OC7H15, PO3Et2, and H). The ground-state electronic prop…
Cobalt-filled apoferritin (Co-ferritin) was, for the first time, used as a wet catalyst for the synthesis of single-walled carbon nanotubes (SWNTs) with narrow diameter distribution. Co-ferritins were spin-coated and converted to cobalt nanoparticles by calcination. Using chemical vapor deposition, suspended networks…
Four various mesoporous silicas (MCM-48, SBA-15, MCF, and MSU) were modified by the molecular designed dispersion method using Fe(acac)3, Cr(acac)3, and Cu(acac)2 complexes. The deposition was performed at the same concentration of the metal acetylacetonate (acac) complex in a toluene solution. All as-synthesized samp…
Thiol-functionalized mesostructured silica with anhydrous compositions of (SiO(2))(1)(-)(x)()(LSiO(1.5))(x)(), where L is a mercaptopropyl group and x is the fraction of functionalized framework silicon centers, are effective trapping agents for the removal of mercuric(II) ions from water. In the present work, we inve…
Photolabile coumarinylmethyl esters of biomolecules (caged compounds) are new tools for studying spatial and time-dependent aspects of signal transduction in living cells. Herein we describe a fluoresence spectroscopic method for the determination of the rate constants of the photolysis steps of such caged compounds u…