Materials Literature
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We report a numerical study of the rate of crystal nucleation in a binary suspension of oppositely charged colloids. Two different crystal structures compete in the thermodynamic conditions under study. We find that the crystal phase that nucleates is metastable and, more surprisingly, its nucleation free energy barri…
In this work, taking the preparation of CuS nanomaterials as an example, the multiple roles of l -cysteine in the formation of metal sulfide nanostructures were elucidated. First, the precursors captured from the initial reaction solutions were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Four…
Low-temperature transport and magnetization measurements, reported for the antiferromagnets $\mathrm{Sr}\mathrm{Mn}{\mathrm{O}}_{3}$ and $\mathrm{Ca}\mathrm{Mn}{\mathrm{O}}_{3}$, provide a means for distinguishing self-trapped from bound magnetic polaron (MPs) and reveal new insight into the role of impurity states on…
The propagation of guided electromagnetic waves in open elliptical metamaterial waveguide structures is investigated. The waveguide contains a negative-index media core, where the permittivity $\ensuremath{\epsilon}$ and permeability $\ensuremath{\mu}$ are negative over a given bandwidth. The allowed mode spectrum for…
We present a high-pressure x-ray diffuse scattering study of the ABO$_3$ ferroelectric perovskites BaTiO_3 and KNbO_3. The well-known diffuse lines are observed in all the phases studied. In KNbO_3, we show that the lines are present up to 21.8 GPa, with constant width and a slightly decreasing intensity. At variance,…
We report high resolution transmission electron microscopy and ab initio calculation results for the defect formation in Pt nanocontacts (NCs). Our results show that there is a size limit to the existence of twins (extended structural defects). Defects are always present but blocked away from the tip axes. The twins m…
We report direct experimental evidence of room temperature spin filtering in magnetic tunnel junctions (MTJs) containing CoFe2O4 tunnel barriers via tunneling magnetoresistance (TMR) measurements. Pt(111)/CoFe2O4(111)/gamma-Al2O3(111)/Co(0001) fully epitaxial MTJs were grown in order to obtain a high quality system, c…
A spin-polarized current with the polarization perpendicular to the plane of a vortex-state disk results in renormalization of the effective damping for a given magnetization mode, and the effective damping becomes zero if the current exceeds a threshold value. The lowest threshold current corresponds to the lowest fr…
A two-field model provides a unifying framework for elasticity, lattice dynamics and electromechanical coupling in graphene and carbon nanotubes, describes optical phonons, nontrivial acoustic branches, strain-induced gap opening, gap-induced phonon softening, doping-induced deformations, and even the hexagonal graphe…
Surface microstructures of solids play a significant role in producing superhydrophobic surfaces. In the present paper, the Cassie?Baxter and Wenzel models on a rough substrate are examined from the viewpoints of geometry and energy. The result shows that if the air beneath a droplet on a sinusoidal substrate is open…
Using a combination of dispersing low-cost carbon nanofibers and a small quantity of carbon nanotubes within the polystyrene matrix, we have demonstrated the formation of a novel nanocomposite with superior microstructure and improved electromagnetic interference (EMI) shielding characteristic. This nanocomposite is v…
We report the solution of the persistent current in two coupled rings in the presence of external magnetic fluxes. We showed that the magnetic fluxes modify the global phase of the electronic wave function for multiple connected geometry formed by the coupled rings. We obtained an exact solution for the persistent cur…
We describe a mechanism, which links the long-range potential fluctuations induced by charged defects to the low frequency resistance noise widely known as 1/f noise. This mechanism is amenable to the first principles microscopic calculation of the noise spectrum, which includes the absolute noise intensity. We have p…
A series of poly(butylene-co-propylene succinate) (PBPSu) random copolyesters were synthesized and characterized using 1HNMR spectroscopy and viscometry. Tensile properties decreased with increasing propylene succinate (PSu) content. Cocrystallization and multiple melting behaviors were investigated. The copolymers sh…
The morphology, nucleation, and crystallization of polyethylene/carbon nanotubes nanocomposites were studied. The nanocomposites were prepared by in-situ polymerization of ethylene on carbon nanotubes (CNT) whose surface had been previously treated with a metallocene catalytic system. The effects of composition (5−22%…
It has recently been demonstrated that chosen clusters of specific size and composition can exhibit behaviors reminiscent of atoms in the periodic table and hence can be regarded as superatoms forming a third dimension. An Al(13) cluster has been shown to mimic the behavior of halogen atoms. Here, we demonstrate that…
Silver nanoparticles in aqueous suspensions were synthesized by reduction of silver oxide by H 2 following recently published procedures. 12 These particles contain no foreign stabilizers or any ions other than those from silver and water. The particles were characterized by their UV−vis absorption spectra, by transmi…
Extensively revised and updated to keep abreast of recent advances, Polymers: Chemistry and Physics of Modern Materials, Third Edition continues to provide a broad-based, high-information text at an introductory, reader-friendly level that illustrates the multidisciplinary nature of polymer science. Adding or amending…
Uniform nylon 6 nanofibers with diameters around 200 nm were prepared by electrospinning. Polymorphic phase transitions and crystal orientation of nylon 6 in unconfined (i.e., as-electrospun) and a high T(g) (340 degrees C) polyimide confined nanofibers were studied. Similar to melt-spun nylon 6 fibers, electrospun ny…
Nanoscale microelectrochemical cells can form on individual carbon nanotubes in neutral aqueous solutions of KMnO4, leading to corrosion of the nanotubes (see image) and simultaneous deposition of nanocrystalline MnO2 on both external and internal surfaces of the nanotubes.