Materials Literature
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Activated Src kinase may contribute to the progression and spread of breast cancers and recent in vitro evidence suggests a role for Src in acquired endocrine resistance. The purpose of this study was to investigate whether modulation of Src activity in endocrine-sensitive and endocrine-resistant breast cancer cells d…
Nanocomposites of polyaniline with barium ferrite and titanium dioxide (TiO2) are synthesized via in situ emulsion polymerization. The transmission electron microscopy (TEM) and high resolution TEM result shows the formation of array of nanoparticles encapsulated within the polymer chains during the synthesis process.…
In this Concept article, we summarize and discuss recent reports on dendritic molecular electrochromic batteries. Giant dendrimers containing 3(n+2) terminal tethers (n = generation number) and terminated by first-raw late-transition-metal metallocenes, permethyl metallocenes and other sandwich complexes were shown to…
The effect of Nd substitution on the microstructures and electrical properties of Aurivillius phase ferroelectric Bi3NbTiO9-based ceramics has been studied. All of the Bi3−xNdxNbTiO9 (0≤x≤1) ceramics are ferroelectrics. The Curie point TC decreased with increasing Nd doping content x. The Bi3−xNdxNbTiO9 ceramics exhib…
Prior studies have shown that a field-induced ferroelectricity in ceramics with general chemical formula (1−x−y)(Bi1/2Na1/2)TiO3–xBaTiO3–y(K0.5Na0.5)NbO3 and a very low remanent strain can produce very large piezoelectric strains. Here we show that both the longitudinal and transverse strains gradually change with app…
Cobalt chromite (CoCr2O4) is a potential multiferroic material. In order to understand the temperature dependent magnetic transitions on particle morphology, here we prepared CoCr2O4 nanoparticles by sonochemical technique. We used powder x-ray diffraction, transmission electron microscopy, selected area electron diff…
Directional wetting on limited sectors of surfaces is achieved on partially wetting microstructured surfaces by placing nonsymmetrical microstructures in a regular rectangular lattice. Droplet spreading to a 90° sector is possible when the microstructures are designed to present broad features towards the right and to…
Tantalum migration from the anode sidewall barrier was observed in Cu interconnects/SiOCH low-k dielectrics after voltage ramp and constant voltage stress. This phenomenon was found to contribute to leakage current as observed from the current-voltage (I-V) and current-time (I-t) leakage curves. The mechanism of Ta mi…
Ca 3 Co 4 O 9 (349) thermoelectric (TE) ceramics were prepared by hot‐pressing (HP) process under various stress levels up to 30 MPa. Microstructure investigations have revealed strong enhancements of the bulk density and the texture strength, and a remarkable decrease of the in‐plane grain boundary density as the HP…
The mixed-valence compound Eu3O4 was prepared by heating an equimolar mixture of EuO and Eu2O3 at 1800 °C for 30 h in a sealed tungsten crucible. Room temperature x-ray powder diffraction measurements showed that Eu3O4 is single phase. Magnetic measurements on polycrystalline Eu3O4 are in good agreement with the resul…
The key to highly efficient growth of carbon nanotubes includes two essential ingredients in the growth ambient: a carbon source that does not contain oxygen and a minute quantity of a secondary gas, which does contain oxygen, that acts as a growth enhancer. These and other general rules governing the growth of carbon…
We address the system-size dependence of typical plastic flow events when an amorphous solid is put under a fixed external strain rate at a finite temperature. For system sizes that are accessible to numerical simulations at reasonable strain rates and at low temperatures the magnitude of plastic events grows with the…
Thermal-magnetic noise at ferromagnetic resonance (T-FMR) can be used to measure magnetic perpendicular anisotropy of nanoscale magnetic tunnel junctions (MTJs). For this purpose, T-FMR measurements were conducted with an external magnetic field up to 14 kOe applied perpendicular to the film surface of MgO-based MTJs…
P monodoped and (P, N) codoped ZnO are investigated by the first-principles calculations. It is found that the substitutional P defect at O site (PO) and interstitial P (Pi) contribute little to the p-type conductivity of ZnO samples under equilibrium condition. Zinc vacancies (VZn) and PZn-2VZn complex are demonstrat…
Fluorescent nanodiamonds (FNDs) of 10–20 nm in size have been produced by helium ion irradiation and isolated by differential centrifugation. Spectroscopic characterization of the FNDs with fluorescence microscopy and fluorescence correlation spectroscopy indicates perfect photostability and use as an alternative to f…
Pyrocarbon (PyC), the common interphase for SiC/SiC, is not stable under severe environmental conditions. It could be replaced by boron nitride more resistant to oxidation but poorly compatible with nuclear applications. Other materials, such as ternary carbides seem promising but their use in SiC/SiC has not been dem…
In Ce3+–Yb3+ co-doped Y3Al5O12 (YAG) ceramics, possibility of quantum cutting mechanism converting one visible photon into two NIR photons with optimum quantum efficiency approaching 200% have been investigated. In this material, Yb3+ emissions due to the F25/2-F27/2 in the range of 1 μm were observed upon the excitat…
Line them up: Under hydrothermal conditions, trilacunary Keggin {B-α-PW9O34} fragments and nickel ions form the two largest Ni-substituted poly(polyoxotungstate)s with the greatest number of Ni ions in a known polyoxometalate. Bridging amine ligands connect the fragments to form the 1D structure of the polyoxometalate…
We investigated Raman spectra of single-layer and multilayer graphene under ultraviolet laser excitation at the wavelength λ=325 nm. It was found that while graphene’s G peak remains pronounced in UV Raman spectra, the 2D-band intensity undergoes severe quenching. The evolution of the ratio of the intensities of the G…
The design of advanced functional materials with nanometer- and micrometer-scale control over their properties is of considerable interest for both fundamental and applied studies because of the many potential applications for these materials in the fields of biomedical materials, tissue engineering, and regenerative…