Materials Literature
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The electron-energy-loss spectra of NiO have been calculated by the ab initio full-potential linearized augmented plane-wave method within the $\mathrm{L}\mathrm{D}\mathrm{A}+U$ approximation and compared with experimental spectra obtained in transmission electron microscopy. The results of standard calculation scheme…
A new family of polymer, namely hyperbranched thermosetting poly(imide−ester) (HBPIE), was successfully prepared by the esterification reaction between a hyperbranched oligoimide terminated with carboxylic end groups (−COOH) and a hyperbranched oligoester terminated with acetoxy end groups (−OAc). The hyperbranched ol…
A multipole expansion method is developed to determine the elastic field of dislocation loop ensembles of arbitrary geometric complexity. The method results in reduction of the severe computational requirements in large-scale dislocation dynamics (DD) computer simulations without an artificial cutoff on the interactio…
We have performed low-temperature scanning tunneling microscopy measurements on single-wall carbon nanotubes that are freely suspended over a trench. The nanotubes were grown by chemical vapor deposition on a Pt substrate with predefined trenches etched into it. Atomic resolution was obtained on the freestanding porti…
Introductory biochemistry texts often note that the fold of a protein is completely defined when the dihedral angles phi and psi are known for each amino acid. This assertion was examined with torsion angle dynamics and simulated annealing (TAD/SA) calculations of protein G using only dihedral angle restraints. When a…
Abstract Effects of a maleated triblock copolymer of styrene–(ethylene‐ co ‐butene)–styrene (SEBS‐ g ‐MA) on compatibilization and mechanical properties of nylon‐12,12/nylon‐6 blends were investigated. The results showed that addition of SEBS‐ g ‐MA could improve the compatibility between nylon‐12,12 and nylon‐6. Nylo…
The relationship between the structure and mechanical properties of sputter-deposited boron carbide films was investigated. Changes in the structure induced by annealing were characterized in terms of chemical composition, chemical bonding, and concentrations of defects and trapped impurities. The creation of interico…
Red and red/blue cathodoluminescence in the temperature range 12 to 300 K was obtained from single- and polycrystal cubic boron nitride bulk samples implanted with europium and annealed under high-temperature, high-pressure conditions. All observed radiative intra-4f electron transitions of Eu3+ can be assigned to tra…
Epitaxial films of the full Heusler alloy Co2MnAl were grown on GaAs substrates by molecular-beam epitaxy. The close lattice matching and similar structure to GaAs make this material a good candidate for a spin injector. Magnetization measurements reveal complex ferromagnetic transitions near the Curie point at TC≃800…
Surface force microscopy was used to examine the dynamic indentation response of austenitic titanium–nickel (TiNi) films sputtered on oxidized silicon substrates. Results demonstrate the significance of indentation cycles, time at maximum contact load, and loading/unloading rate on the nanoscale pseudoelastic behavior…
An influence of a high-field annealing on the magnetic properties was investigated in sintered Nd–Fe–B magnets. When the sample B, containing 0.32 at. % Al, was annealed at Ta=550 °C under a magnetic field of Ha=140 kOe and then cooled without field, the coercivity Hc increased by 25% with respect to the control sampl…
The surface chemistry of coke precursors on spent fluid catalytic cracking catalysts during the oxidative regeneration process was investigated by temperature-programmed desorption and temperature-programmed oxidation experiments and IR spectroscopy. NH 3 and HCN are formed via cracking and hydrolysis reaction of coke…
Aluminum was incorporated into the mesoporous framework of ethane−silica by one-pot condensation of Al(O i Pr) 3 with 1,2-bis(trimethoxysilyl)ethane using octadecyltrimethylammonium chloride as surfactant. Powder X-ray diffraction patterns, nitrogen sorption analysis, and TEM results reveal the formation of an ordered…
In this article we report on the conductance of bundles of single-wall carbon nanotubes as a function of temperature and bias voltage. We focus on the nonlinearity in the IV curves near zero bias, i.e., a pronounced conductance dip. While we observe that all temperature dependent data scale onto a single curve, we als…
A novel method for the purification of single-walled and multiwalled carbon nanotubes is described. The method involves acid washing followed by hydrogen treatment in the 700−1000 °C range. While acid washing dissolves the metal particles, the hydrogen treatment removes amorphous carbon as well as the carbon coating o…
Abstract Contact angles and surface tension data were measured to obtain the surface tension components of polyacrylamide (PAM). According to Van Oss, Chaudhury, and Good (VCG) theory, the surface tension components were used to calculate the PAM solubility in five different polar solvents: water, ethylene glycol (EG)…
A new class of discotic liquid crystals derived from tris(N-salicylideneanilines) existing exclusively in their C3h and Cs keto-enamine tautomeric forms is reported. These compounds self-assemble to form columnar liquid crystalline phases with a small core-core separation as evidenced by X-ray diffraction studies.
Abstract A method has been developed for the quantitative determination of the composition of thermoplastic wood composites. The method involves area measurements of the two peaks in the derivative curve of a tracing produced by the thermogravimetric analysis (TGA) of a thermoplastic composites sample in an inert atmo…
Abstract Toughening of recycled poly(ethylene terephthalate) (PET) was carried out by blending with a maleic anhydride grafted styrene‐ethylene/butylene‐styrene triblock copolymer (SEBS‐ g ‐MA). With 30 wt % of the SEBS‐ g ‐MA, the notched Izod impact strength of the recycled PET was improved by more than 10‐fold. SEM…
Visible quantum cutting (visible two-photon luminescence) through downconversion is observed for the Gd3+–Eu3+ couple in Eu3+-doped KGd3F10 (KG3F) and KGd2F7 (KG2F). The dependence of the efficiency of cross-relaxation required for visible quantum cutting on the Eu3+-doping concentration and crystal structure is discu…