Materials Literature
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Time-resolved terahertz spectroscopy is used to probe ultrafast carrier dynamics and terahertz conductivity in photoexcited thin films of silicon nanocrystals, polynanocrystalline silicon, and epitaxial silicon-on-sapphire. We show that a Drude-Smith model provides an excellent fit to the observed transient terahertz…
Branched peptide amphiphile (PA) molecules bearing biological epitopes were designed and synthesized using orthogonal protecting group chemistry on amine groups at lysine residues. These molecules self-assemble into high-aspect-ratio cylindrical nanofibers, and their branched architecture enhances accessibility of epi…
We report an approach to the chemical engineering of the single-walled carbon nanotube (SWNT)-polymer interfacial interaction in a nylon 6 graft copolymer composite which is based on the degree of SWNT functionality. Continuous fibers are drawn from composites fabricated from the in situ polymerization of caprolactam…
We report the formation of vesicles with a laterally nanostructured membrane by self-assembly of "miktoarm" star terpolymers, that is, macromolecules with three chemically distinct arms. The lateral structure consists of approximately hexagonally packed fluorocarbon channels with 4.1 nm radii, immersed in a continuous…
A comprehensive theoretical investigation on the field-driven reorientation transitions in uniaxial multilayers with antiferromagnetic coupling is presented. It is based on a complete survey of the one-dimensional solutions for the basic phenomenological (micromagnetic) model that describes the magnetic properties of…
Raman spectroscopy was used to investigate the structure of ion-irradiated α-SiC single crystals at room temperature and 400 °C. Irradiations induce a decrease of the Raman line intensities related to crystalline SiC, the appearance of several new Si–C vibration bands attributed to the breakdown of the Raman selection…
The self-assembly of triblock copolymers of poly(ethylene oxide-b-methyl methacrylate-b-styrene) (PEO-b-PMMA-b-PS), where PS is the major component and PMMA and PEO are minor components, provides a robust route to highly ordered, nanoporous arrays with cylindrical pores of 10-15 nm that show promise in block copolymer…
A strategy for controlling the location of gold nanoparticles within block copolymer domains through varying the surface coverage of gold nanoparticles by end-attached polymer ligands is described. Gold nanoparticles coated by short thiol end functional polystyrene homopolymers (PS-SH) ( M n = 3.4 kg/mol) are incorpor…
For proton-conducting oxides to be used in fuel cell and related technologies, sintering to form dense ceramics at low temperatures and avoiding carbonation of BaCeO3-based oxides is required. A new strategy that allows densification at much reduced temperatures (see figure) and provides high total conductivity, with…
ZnO nanowires, grown on transparent conducting oxide substrates from aqueous solutions of methenamine and Zn(NO 3 ) 2 , were integrated as the wide band gap semiconductor into dye-sensitized solar cells. ZnO nanowires and their growth mechanisms were studied using electron microscopy, x-ray diffraction and photolumine…
Covalent derivatization of the acidic functional groups in oxidized graphite with octadecylamine renders graphite soluble in common organic solvents. Atomic force microscopic characterization of the soluble species supports the idea that the solutions consist of single and few layer graphene sheets, and we report the…
Waste minimisation is increasingly being considered as part of a comprehensive approach to sustainable design.Good site practice and procurement systems can realise some reductions in construction and demolition waste, but to significantly reduce waste and create a virtually zero waste building changes in the building…
We have carried out $^{55}\mathrm{Mn}$ NMR measurements on ${\mathrm{Bi}}_{0.125}{\mathrm{Ca}}_{0.875}\mathrm{Mn}{\mathrm{O}}_{3}$ and $\mathrm{Ca}\mathrm{Mn}{\mathrm{O}}_{3}$. NMR signals have been observed for ${\mathrm{Bi}}_{0.125}{\mathrm{Ca}}_{0.875}\mathrm{Mn}{\mathrm{O}}_{3}$ at $4.2\phantom{\rule{0.3em}{0ex}}\…
Insulator contamination has been identified as the most important factor in the design of external insulation of high voltage transmission, sub-transmission and distribution systems throughout the world. In the electrical design of high voltage insulators, the design engineers need a simple and reliable tool when calc…
Abstract The reaction of V 2 O 5 with H 2 C 2 O 4 · 2H 2 O in the presence of H 3 BO 3 under hydrothermal conditions has afforded V 2 O 2 (OH) 2 (C 2 O 4 )(H 2 O) 2 ( 1 ), which crystallizes in the triclinic system, space group P $\bar {1}$ with a = 5.2405(10) Å, b = 5.7340(11) Å, c = 7.1778(14) Å, α = 76.44(3)°, β =…
A series of Ru(II) complexes, tcc-RuX2(POC4Pyr-P,O)2 (X = Cl (3), Br (4), I (5)), containing the hemilabile phosphine pyrenyl ether ligand 4-{2-(diphenylphosphino)phenoxy}butylpyrene (POC4Pyr (1)) are reported. The synthesis and spectroscopic properties of both the ligand, POC4pyr (1), and ligand oxide, P(=O)OC4pyr 2,…
The defect centres formed in the TL phosphor CaSO4:Dy,Ag are studied using the technique of Electron Spin Resonance. The Ag co-doped phosphor exhibits three glow peaks around 130, 220 and 375 degrees C in contrast with the two glow peaks observed in the CaSO4:Dy phosphor at 130 and 220 degrees C at a gamma ray dose of…
Intense local heating of $\mathrm{Si}{\mathrm{O}}_{2}$ is shown to occur during chemical vapor deposition growth of single-walled carbon nanotubes in the presence of an electric field. This gives rise to the Marangoni effect where strong convection currents are induced in the molten $\mathrm{Si}{\mathrm{O}}_{2}$ layer…
Fourier transform infrared absorption and photoluminescence (PL) spectroscopy were used to investigate the defects in a codoped ZnO : Al : N film grown on a Si (111) substrate. Two broad vibrational modes around 3000 and 3120 cm −1 were found, which may be attributed to the formation of N–H bonds in different configur…
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