Materials Literature
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We used force-field-based molecular dynamics to study the interaction between polymers and carbon nanotubes (CNTs). The intermolecular interaction energy between single-walled carbon nanotubes and polymers was computed, and the morphology of polymers adsorbed to the surface of nanotubes was investigated. Furthermore,…
Block copolymer poly(styrene-b-dimethylsiloxane) fibers with submicrometer diameters in the range 150-400 nm were produced by electrospinning from solution in tetrahydrofuran and dimethylformamide. Contact angle measurements indicate that the nonwoven fibrous mats are superhydrophobic, with a contact angle of 163 degr…
A multifunctional nanoprobe capable of targeting glioma cells, detectable by both magnetic resonance imaging and fluorescence microscopy, was developed. The nanoprobe was synthesized by coating iron oxide nanoparticles with covalently bound bifunctional poly(ethylene glycol) (PEG) polymer, which were subsequently func…
Abstract The full range of relaxation processes present in optically pure poly‐( n ‐hexyl methacrylate) (PHMA) was studied using Rayleigh–Brillouin and photon correlation spectroscopy (PCS). Brillouin shifts, linewidths, and Landau–Placzek ratios (LPR) were measured over the temperature range from −11 to 21 °C. The Br…
We report here the magnetization and Eu151 Mössbauer studies in ordered perovskite-type oxides, Ba2EuRu1−xCuxO6 (x=0.0, 0.1 and 0.2). The parent compound, Ba2EuRuO6, shows a magnetic ordering at 40K. Both the magnetization and Mössbauer measurements indicate that the magnetic ordering temperature is unchanged as Cu pa…
Abstract Simultaneous kinetic measurement of microscopic infrared dichroism, macroscopic stress, and mesoscale strain was used to study the deformation mechanisms of metallocene polypropylene (MPP), ethylene–butylene rubber (EBR), and their blend (MPP/EBR = 80/20 w/w). As with pure MPP, the molecular orientation in th…
Response of various elasto-plastic models is compared at large strains under cyclic loading. In contrast to the small strain case, the cyclic instability is observed at large strains for some elasto-plastic material models with a kinematic hardening. The cyclic instability manifests itself as changing of shape, size o…
Oxidation behavior of silicon nitride (Si 3 N 4 ) was investigated in flowing air (2.45 cm/s) containing 10%–50% H 2 O at a total pressure of 1.8–10 atm at 1300°–1500°C for 100 h. The oxidation of Si 3 N 4 progressed with volatilization of the SiO 2 scale; it was more enhanced at a high partial pressure of H 2 O rathe…
We investigate the pressure-induced structural transformation in liquid Al 2 O 3 by a molecular dynamics (MD) method. Simulations were done in the basic cube, under periodic boundary conditions, containing 3000 ions with Born–Mayer-type pair potentials. The structure of the liquid Al 2 O 3 model with a real density at…
We have measured the electrical resistivity, Hall effect, and magnetization of a $\mathrm{Nd}{\mathrm{B}}_{6}$ single crystal, in a temperature range from $2\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and in magnetic fields of up to $7\phantom{\rule{0.3em}{…
In this paper we map out the 1300°C isothermal section in the Ti–In–C ternary system. Two ternary compounds exist: Ti 2 InC α and Ti 3 InC δ . At 1300°C TiC x is in equilibrium with all phases, Ti 3 InC δ is in equilibrium with all the phases except C, and Ti 2 InC is in equilibrium with all phases except Ti and C. Th…
Electron field-emission properties of as-grown, etched, and regrown carbon nanotube thin films were investigated. The aligned carbon nanotube films were deposited by the microwave plasma-assisted chemical vapor deposition technique. The surface of the as-grown film contained a carbon nanotube mat of amorphous carbon a…
We show that the intercalating of alkali atoms with adequate concentration can transform a metallic single-walled carbon nanotube (SWCNT) into a semiconductor tube or a semiconductor SWCNT into a semiconductor tube with different band gaps due to a unique feature of the band structures in some SWCNTs as quasi-one-dime…
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In this work, the unique synthesis of mechanically milled silicon nanocrystals (Si nc) embedded in tetraethylorthosilicate (TEOS) thin films is reported. A series of Si nc, with sizes ranging from 10to25nm, have been synthesized using mechanical milling. For both the milled Si nc and milled Si nc embedded in TEOS thin…
Thermodynamic phase diagrams of alloys are usually computed or experimentally determined under the assumption of perfect crystallinity of the material. Here, we show that dislocations can change the phase stability of alloys and increase the size of the miscibility gap. This dislocation-induced destabilization of the…
The electronic structure of the Si(1 1 1):GaSe van der Waals-like surface termination has been determined by angle-resolved photoelectron spectro- scopy using photons in the energy range h ν = 12–170 eV supplied by the BESSY and ALS synchrotron light sources. The Si(1 1 1):GaSe surface is isoelectronic to the passivat…
Abstract A well‐regulated striped pattern was produced on a thin gold film with the following very simple procedure. Gold was deposited by ion sputtering onto an elastic silicone sheet that was prestretched. The obtained gold film was observed without the release of the stretching. A well‐regulated striped pattern spo…
Previous literature has shown that when a crack extends across a compressive layer within a two‐phase laminar ceramic, the crack can bifurcate under special conditions. These special conditions appeared to require that a second crack (known as an edge‐crack) had to preexist along the center line of the compressive lay…
Mullite–ZrO 2 composites have been fabricated by attrition milling a powder mixture of zircon, alumina, and aluminum metal with MgO or TiO 2 as sintering additives, heating at 1100°C to oxidize the aluminum metal, and consolidation by spark plasma sintering (SPS). The influence of the SPS temperature on the formation…