Materials Literature
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Macroporous ceramics are fabricated using emulsions stabilized with particles of various chemical compositions. Stabilization with particles hinders extensive droplet coalescence during solvent extraction, allowing for drying and sintering of the emulsions directly into macroporous materials in the absence of any chem…
Abstract A method of synthesis of liquid high‐molecular‐weight epoxy resins from modified vegetable oils as natural raw materials is proposed. The possibility of application of epoxidized soybean, rapeseed, linseed, and sunflower oils as well as hydroxylated soybean and rapeseed oils as raw materials in the fusion pro…
Cobalt nanotube arrays embedded in AAO templates are synthesized by direct electrodeposition with low current density. The nanotubes exhibit an hcp structure with the easy axis perpendicular to the tube. MFM imaging shows only a weak magnetic signal and SQUID measurements reveal sheared hysteresis for the field parall…
Abstract Czochralski growth of large metallic alloy single crystals of Al 13 Co 4 and Al 13 Fe 4 from Al‐rich solutions has been demonstrated for the first time. A detailed description of all decisive steps of the growth procedure is given with particular emphasis to seeding from a native phase as well as spontaneous…
The epitaxial thin films of LaFeAsO were fabricated on MgO(001) and mixed-perovskite (La,Sr)(Al,Ta)O3(001) single-crystal substrates by pulsed laser deposition using a Nd-doped yttrium aluminum garnet second harmonic source and a 10at.% F-doped LaFeAsO disk target. Temperature dependences of the electrical resistiviti…
Combining a piezoelectric/magnetostrictive laminated composite with a piezoelectric transformer (see figure) generates a giant magnetoelectric (ME) response. The output ME voltage is amplified by the additional piezoelectric transformer layer. The outstanding advantages of the proposed structure include giant ME volta…
We report on synthesis of a uniform and large area of a new form of ZnO nanocorals. These nanostructures can provide suitable electrical pathways for efficient carrier collection as well as large surface areas for the photoelectrochemical (PEC) cells. PEC devices made from these ZnO nanocoral structures demonstrate si…
We report a label-free porous silicon membrane waveguide biosensor based on a 1μm thick freestanding porous silicon film with 100nm diameter pores. The sensor operates in the Kretschmann configuration. A formvar polymer film provides robust adhesion of the porous silicon membrane to a rutile prism and enables confinem…
Abstract A simple synthesis method of silver nanoparticles and its application as an active surface‐enhanced Raman spectroscopy (SERS) colloid are presented in this work. The photoreduction of AgNO 3 in presence of sodium citrate (NaCit) was carried out by irradiation with different light sources (UV, white, blue, cya…
We study the properties of a tunable nonlinear metamaterial operating at microwave frequencies. We fabricate the nonlinear metamaterial composed of double split-ring resonators and wires where a varactor diode is introduced into each resonator so that the magnetic resonance can be tuned dynamically by varying the inpu…
Closely packed ZnO nanowire array was fabricated on a n-type Si (100) substrate by a magnetron cosputtering method. The ZnO nanowire/n-Si heterojunction showed good diode characteristics with rectification ratio of above 1.6×102 at 4V in the dark. Experiments demonstrated that the diode could be used to detect either…
By combining the methods of isotopic substitution in neutron diffraction and high-energy x-ray diffraction, we have determined partial structure factors of vitreous ${\text{SiO}}_{2}$. A discussion of the effect of systematic and statistical errors is presented. The experimental results are found to be in good (but no…
We review the formalisms of the self-consistent GW approximation to many-body perturbation theory and of the generation of optimally-localized Wannier functions from groups of energy bands. We show that the quasiparticle Bloch wave functions from such GW calculations can be used within this Wannier framework. These Wa…
This feature article focuses on the synthesis of noble metal nanoparticles and how these particles can be incorporated into thin films. The functional properties of the nanoparticles when embedded in a host matrix are covered. In particular the optical properties of noble metal nanoparticles, numerical theory, includi…
Abstract The increasing use of polyoxometalates in the fields of material sciences, catalysis, and biology has raised the interest in chirality of such systems. This review provides a summary of the different strategies followed: i) chirality in solid‐state arrangements, ii) chiral polyoxometalate frameworks, and iii)…
Generally, the parameters in the interaction potential between like molecules in a mixture can be determined in a relatively straightforward manner from the properties of the pure components. However, the determination of the parameters in the interaction potential between the unlike pairs in the mixtures is more diff…
Oxide based ferromagnet/semiconductor heterostructures offer substantial advantages for spin electronics. We have grown (111) oriented Fe3O4 thin films and Fe3O4/ZnO heterostructures on ZnO(0001) and Al2O3(0001) substrates by pulsed laser deposition. High quality crystalline films with mosaic spread as small as 0.03°,…
We have developed a new efficient and accurate impurity solver for the single impurity Anderson model (SIAM), which is based on a non-perturbative recursion technique in a space of operators and involves expanding the self-energy as a continued fraction. The method has no special occupation number or temperature restr…
The trap distribution in the conjugated polymer poly(3-hexylthiophene) was investigated by fractional thermally stimulated current measurements. Two defect states with activation energies of about 50 meV and 105 meV and Gaussian energy distributions were revealed. The first is assigned to the tail of the intrinsic den…
Graphene was deposited on a transparent and flexible substrate and tensile strain up to ~0.8% was loaded by stretching the substrate in one direction. Raman spectra of strained graphene show significant redshifts of 2D and G band (-27.8 cm^-1 and -14.2 cm^-1per 1% strain, respectively), because of the elongation of th…