Materials Literature
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Using the spin-spiral formulation of the tight-binding linear muffin-tin orbital method, the principal components of the exchange stiffness tensor are calculated for typical hard magnets including tetragonal CoPt-type and hexagonal YCo5 alloys. The exchange stiffness is strongly anisotropic in all studied alloys. This…
The use of tetraalkylammonium hydroxides to prepare ZnO colloids with diameters ranging from 1 to 6 nm is described. The position of the first excitonic transition has been measured by UV-vis spectrometry and correlated with the particle size, which has been measured using high-resolution transmission electron microsc…
We discuss methods to map crystallographic textures in crystal plasticity finite element simulations. Fourier-type series expansion methods which use spherical harmonic library functions as well as the direct pole figure inversion methods are not well suited to reproduce texture information in a sufficiently localized…
The formation of luminescent supramolecular ternary complexes in water: delayed luminescence sensing of aromatic carboxylates using coordinated unsaturated cationic heptadenatate lanthanide ion complexes.
The pseudo–one-dimensional (psuedo-1D) conjugated electronic structure of single-walled carbon nanotubes (SWNTs) allows them to exhibit semiconducting and metallic properties and to exhibit ballistic transport (1). We show that their unique electronic structure also offers the opportunity for new horizons in chemistry…
Tetrapod-like zinc oxide (ZnO) nanostructures can be synthesized by rapid heating metal zinc pellet at 900 °C under air ambient. Catalyst, vacuum, and carrying gas are not necessary, and more importantly, it is a volcanic process for rapid and mass production. The turn-on field of the synthesized tetrapod-like ZnO nan…
It has been found that laminate composites of longitudinally magnetized magnetostrictive TERFENOL-D and a transversely poled piezoelectric Pb(Mg1/3Nb2/3)O3–PbTiO3 crystal have extremely high magnetic field sensitivity. At room temperature, an output voltage with an exceptionally good linear response to an ac magnetic…
A circular disk resonator is used to study the gas sensing properties of carbon nanotubes. It detects the presence of gases based on the change in the dielectric constant rather than electrical conductivity of single walled carbon nanotubes (SWNTs) upon gas exposure. A conducting circular disk is coated with electric…
A new technology to form nanoparticles of hydrophobic organic actives at high concentration and yield, as well as methods to characterize the process, are presented. In Flash NanoPrecipitation, an organic active and an amphiphilic diblock copolymer are molecularly dissolved in an organic phase and mixed rapidly with a…
The slip effects of water flow in hydrophilic and hydrophobic microchannels of 1 and 2 μm depth are examined experimentally. High-precision microchannels were treated chemically to enhance their hydrophilic and hydrophobic properties. The flow rates of pure water at various applied pressure differences for each surfac…
Diazonium reagents functionalize single-walled carbon nanotubes suspended in aqueous solution with high selectivity and enable manipulation according to electronic structure. For example, metallic species are shown to react to the near exclusion of semiconducting nanotubes under controlled conditions. Selectivity is d…
We report the crystal structure of rubidium peroxodicarbonate, which was synthesized by electrocrystallization at T=257 K, from laboratory X-ray powder diffraction data. The compound crystallizes in the monoclinic space group P2(1)/c with four formula units per unit cell and cell parameters of a=7.9129(1), b=10.5117(1…
ADVERTISEMENT RETURN TO ISSUEPREVAddition & Corre...Addition & CorrectionA Carbon Nanotube Cross Structure as a Nanoscale Quantum DeviceAlireza Nojeh, Gregory W. Lakatos, Shu Peng, Kyeongjae Cho, and R. Fabian W. PeaseCite this: Nano Letters 2003, 3, 10, 1469Publication Date (Web):September 11, 2003Publication History…
A close look at the definitions of “coercivity” reveals two distinct notions: one referring to the hysteresis loop for B vs H and the other to that of M vs H. These are confused in several books. The properties of the M vs H loop are often ascribed to the B vs H loop, giving rise to various misconceptions. In this not…
The kinetics of grain growth during thermally induced phase transitions between two block copolymer ordered phases have been determined by polarized optical microscopy (POM). Measurements were made on poly(styrene- b -isoprene) copolymers, f PS = 0.3−0.6, in solutions with dialkyl phthalates at polymer volume fraction…
We have studied magnetic properties of heavily Mn-doped [(In0.44Ga0.56)0.79Mn0.21]As thin films grown by low-temperature molecular-beam epitaxy on InP substrates. (InGaMn)As with high Mn content (21%) was obtained by decreasing the growth temperature to 190 °C. When the thickness of the [(In0.44Ga0.56)0.79Mn0.21]As la…
The ring-opening polymerization (ROP) of epsilon-caprolactone (CL) was carried out in toluene at 100 degrees C with n-propanol (nPrOH) in the presence of Bu(2)SnCl(2). It comes out that the molar mass of the polyester chains can be predicted from the initial monomer-to-alcohol molar ratio in accordance with a controll…
Light‐emitting diodes (LEDs) were fabricated using two europium complexes , differing only by the addition of tert ‐butyl groups around the β‐diketonate ligands (see Figure), blended into poly(2‐(6′‐cyano‐6′‐methyl‐heptyloxy)‐1,4‐phenylene) (CN‐PPP). The addition of tert ‐butyl groups results in CN‐PPP–Eu LEDs with in…
Symmetric and highly asymmetric polystyrene- block -polyisoprene- block -polystyrene (SIS triblock) copolymers were synthesized via sequential anionic polymerization using difunctional initiator, and symmetric and highly asymmetric polystyrene- block -polyisoprene (SI diblock) copolymers were also synthesized using mo…
Narrow distribution macrocyclic poly(9,9-dimethyl-2-vinylfluorene) (PDMVF) and the matching linear precursors with the same degree of polymerization (DP n from 12 to 145) were synthesized via anionic polymerization followed by the end-to-end coupling with 1,4-bis(bromomethyl)benzene (DBX) or 9,10-bis(chloromethyl)anth…