Materials Literature
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Polyconvexity is one of the known conditions which guarantee existence of solutions of boundary value problems in finite elasticity. In this work we propose a framework for development of polyconvex strain energy functions for hyperelastic materials with cubic anisotropy. The anisotropy is captured by a single fourth…
We study the Magneto-Electric (ME) effect from the viewpoint of the Berry phase connection and quantum adiabatic charge transport (QAPT). The linear response theory for the electronic polarization $\vec{P}_{\rm{el}}$ can be interpreted in terms of the flux or the fictitious magnetic field related to the Berry phase in…
It is known that the relaxed excited state of [Ru(bpy)3]2+ is best described as a metal to ligand charge transfer (MLCT) state having one formally reduced bipyridine and two neutral. Previous reports have suggested [Malone, R. et al. J. Chem. Phys. 1991, 95, 8970] that the electron "hops" from ligand to ligand in the…
The mechanism of the effect of particle addition on sonochemical reaction is studied through the measurements of frequency spectrum of sound intensity for evaluating the cavitation noise and the absorbance for the liberation of iodine from an aqueous solution of KI as an index of oxidation reaction by ultrasonic irrad…
Vertically aligned single-crystal ZnO nanorods have been successfully fabricated on semiconducting GaN, Al0.5Ga0.5N, and AlN substrates through a vapor-liquid-solid process. Near-perfect alignment was observed for all substrates without lateral growth. Room-temperature photoluminescence measurements revealed a strong…
A new level of programmability and freedom in directing the crystal growth of cuprous oxide was demonstrated by controlling the degree of branching and crystal habit in a systematic manner during electrodeposition. Examples of Cu2O crystals in which these features were directed by rationally designing a growth conditi…
Hydrogen-rich materials infused in nanoscaffolds offer a promising approach to on-board hydrogen storage. A mesoporous scaffold decreases the temperature for hydrogen release from ammonia borane (AB), a conventional hydrogen-storage material, to below 80 °C and leads to an increase in the purity of the hydrogen releas…
The dynamics of randomly crosslinked liquids is addressed via Rouse-type and Zimm-type models with crosslink statistics taken either from bond percolation or Erdos–Rényi random graphs. While the Rouse-type model isolates the effects of the random connectivity on the dynamics of molecular clusters, the Zimm-type model…
Thin films of ZnxCd1-xSe were electrodeposited from an acidic aqueous solution of selenite (SeO2) and Cd-/Zn-sulphates. The film composition was determined by x-ray diffraction (XRD) and energy dispersive x-ray (SEM/EDX) spectroscopy. In addition, the structural and optical film properties were studied by micro-Raman…
Nano‐sized aluminum nitride (AlN) powders can enhance the sinterability of AlN ceramics. The present work examined the pulverization and dispersion of AlN powder using ZrO 2 beads of 0.1 mm in diameter as grinding medium in order to obtain nano‐sized powder for low‐temperature sintering. An attracting feature of the b…
Silicone rubber is routinely used for biomedical applications and, in several cases, the polymer surface has to be covered with a thin layer of a biocompatible metal such as titanium. The adhesion of a metal film to a silicone surface, however, constitutes a challenging issue.
The fracture energies of the tape‐cast silicon nitride with and without 3 wt% rod‐like β‐Si 3 N 4 seed addition were investigated by a chevron‐notched‐beam technique. The material was doped with Lu 2 O 3 –SiO 2 as sintering additives for giving rigid grain boundaries and good heat resistance. The seeded and tape‐cast…
We report a molecular dynamics simulation study on an ensemble of rod-like particles, each composed of nine soft spheres held rigidly along a line. We have calculated translational mean square displacements and velocity autocorrelation functions in the fluid phases exhibited by the model, i.e., smectic A, nematic and…
Highly crystal textured copper ferrite films have been grown on (100) MgO substrates using pulsed laser deposition. Deposition temperatures were varied from 600–900°C, with deposition oxygen pressure varied from 1mTorr to 120mTorr. Saturation magnetization was measured to increase monotonically with substrate temperat…
Nanostructure refinement, magnetic anisotropy and hard magnetic property enhancement have been observed in melt-spun Nd2.4Pr5.6Dy1Fe84Mo1B6 nanocomposites annealed in an in-plane or out-of-plane field of 1.2T. The magnetic annealing results in an enhancement of an out-of-plane (110) crystal texture of α-Fe and an in-p…
The growth of ceria (CeO2) films by oxidation of evaporated Ce metal on Si(111) and on CaF2(111) epilayers on Si(111) is compared. By use of XPS, UPS, and LEED, it has been demonstrated that the application of a CaF2 buffer layer between the ceria and Si substrate prevents the formation of an amorphous oxidized Si lay…
The network response associated with the incorporation and reactivity of water molecules in bulk phases of amorphous and crystalline silica are investigated using density functional theory. The extent of network relaxation is found to change the relative stabilities of the reactant and product states. A highly reactiv…
We extend the Clusters model to account for the presence of rigid inclusions and use it to analyze the experimental sintering kinetics of composites of 60SiO 2 ·24B 2 O 3 ·16Na 2 O glass particles and zirconia fibers. We followed the densification kinetics of such composites as a function of the particle size, volume…
Laser ablation deposition has been used to synthesize nanoscale ferrite structures. Our investigations were performed on NiZn and Zn ferrite films deposited on silicon(100) substrates. Films produced by laser ablation at room temperature were annealed at 550°C for 1h. Other films were deposited directly at a 550°C sub…
Thin films on substrate may crack due to tensile residual stress taking a mud crack like pattern. The pattern can be controlled by prescribing stress raisers that initiate, and arresters that terminate, cracks at desired locations. Here, we describe the mechanism by which stresses are amplified in plasma-deposited fil…