Materials Literature
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The heteroepitaxial growth of crystalline core-shell nanostructures of a variety of materials has become possible in recent years, allowing the realization of various novel nanoscale electronic and optoelectronic devices. The increased surface or interface area will decrease the thermal conductivity of such nanostruct…
UHV dynamic force and energy dissipation spectroscopy in non-contact atomic force microscopy were used to probe specific interactions with composite systems formed by encapsulating inorganic compounds inside single-walled carbon nanotubes. It is found that forces due to nano-scale van der Waals interaction can be made…
We report a successful synthesis of monodisperse L10-FePt nanocrystals which are not only superior in magnetism but also easy to handle through being dispersible in solvents. Thanks to a thick SiO2-coating, the thermal treatment needed to form the L10 structure can be done even at 900 oC without inducing coalescence a…
Delicate hollow ZnO urchins have been fabricated by thermal evaporation of metallic zinc powders in a tube furnace without the use of additive, high temperature, or low pressure. The phase transformation, morphologies, and photoluminescence evolution of the ZnO products were carefully studied and investigated with X-r…
Covalently functionalized Laponite clay was synthesized through a condensation reaction of the clay's silanol groups with mono- and trifunctional alkoxy silanes. Most of the work focuses on primary-amine-containing modifications because that group offers a wide range of derivitization options. Various 3-aminopropyltri…
We extend present Shannon's static statistical information theory to dynamic processes and establish a dynamic statistical information theory. We derive the nonlinear evolution equations of dynamic information density and dynamic information entropy density. We present the expressions of drift information flow and dif…
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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