Materials Literature
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We show that covalent functionalization of carbon nanotubes (CNTs) via 1,3-dipolar cycloaddition is a powerful method for enhancing the ability to process CNTs and facilitating the preparation of hybrid composites, which is achieved solely by mixing. CNTs were functionalized with phenol groups, providing stable disper…
Au- and Ag-ZnO composite nanocrystals having a dumbbell-like structure were successfully synthesized through the nucleation and decomposition of zinc hydroxide at the surface of pre-existing Au and Ag nanoparticles, respectively. The average size of the Au and Ag nanoparticles used was ∼4 nm and that of the ZnO nanocr…
Equilibrium swelling is a feasible and simple experiment to determine the cross-link density of networks. It is the most popular and useful approach; however, in most of the cases, the given values are highly uncertain if not erroneous. The description of the complex thermodynamics of swollen polymer networks is usual…
Varying amount of Bi2O3 excess Bi3.25La0.75Ti3O12 (BLT) ceramics were prepared by solid state reaction and BLT thin films were fabricated on Pt/TiO2/SiO2/Si using RF magnetron sputtering method. The effect of Bi2O3 excess content on the microstructure and ferroelectric properties of the BLT ceramic and thin film was i…
Relaxation times in KH 3 (SeO 3 ) 2 crystals were measured as functions of temperature. There are no significant changes in T 1 for 1 H and 39 K nuclei at T C , except for a change in the number of proton and potassium signals. The role of structural changes in this transition is relatively minor. The transition is dr…
We formed BoFeO3 (BFO) thin films by chemical solutions deposition on Pt/Ti/SiO2/Si(100) structures and achieved low leakage current density at room temperature. The XPS spectrum confirmed that the valance state of Fe in our BFO thin films was mainly Fe3+, which is associated with low leakage current density in BFO th…
BaTiO3 films were deposited by the direct vapor deposition (DVD) technique to prepare thin dielectric layers for multilayer ceramic chip capacitors (MLCCs). The BaTiO3 films were successfully prepared by co-evaporation of the BaTiO3 ceramic and Ti metal source. The films deposited at room temperature and 600°C were am…
We study the effect of non-Markovian reservoirs on the heat conduction properties of short to intermediate size molecular chains. Using classical molecular dynamics simulations, we show that the distance dependence of the heat current is determined not only by the molecular properties, rather it is also critically inf…
A magnetoelectric (ME) laminate composite consisting of a ferroelectric Pb(Fe0.52Nb0.48)O3-PbTiO3 (PFNT) single crystal and two magnetostrictive Tb1-xDyxFe2-y (Terfenol-D) layers has been developed and its ME voltage coefficients (α E ) depending on different magnetic bias fields and various frequencies have been stud…
Scanning tunneling microscopy and spectroscopy were conducted over a broad temperature range on single crystals of Pr 0.68 Pb 0.32 MnO 3 . Spectroscopic studies revealed inhomogeneous maps of the zero-bias conductance with a broad distribution of the local conductivities only within a narrow temperature range close to…
The crystal structure and the local atomic order of a series of nanocrystalline ZrO 2 –CaO solid solutions with varying CaO content were studied by synchrotron radiation X-ray powder diffraction and extended X-ray absorption fine structure (EXAFS) spectroscopy. These samples were synthesized by a pH-controlled nitrate…
Magnetic and transport properties of ${\text{La}}_{0.7}{\text{Ca}}_{0.3}{\text{Mn}}_{1\ensuremath{-}x}{M}_{x}^{\ensuremath{'}}{\text{O}}_{3}$ $({M}^{\ensuremath{'}}=\text{Al},\text{Ti})$ are studied. The dilution of the Mn network results in a weakening of the ferromagnetism, a deterioration of the metallic conductivi…
We present an exhaustive study on tunneling and electrical conduction in an electrically biased GaAs-Al(y)Ga(1-y)As generalized Fibonacci superlattice. The study is based on transfer matrix formalism using an Airy function approach and provides an exact calculation of the current density in the case of quasi-periodic…
Electron emission from collisions of ${\mathrm{C}}^{3+}$ ions ($22.7\text{ }\text{ }A\text{ }\mathrm{MeV}$) with carbon foils (21, 49 and $90\text{ }\text{ }\ensuremath{\mu}\mathrm{g}/{\mathrm{cm}}^{2}$) was studied by the time-of-flight method. Two prominent emission patterns can be readily identified as ``binary enc…
We report that SWCNTs substantially improve the uniformity and coverage of TiO2 coatings on porous ZrO2 ceramic membrane filters. The ZrO2 filters were dip coated with 100 nm anatase TiO2, TiO2/SWCNT composites, a TiO2+SWCNT mixture, and a TiO2/MWCNT composite at pH 3, 5, and 8. Whereas the TiO2+SWCNT mixture and the…
The spinodal phase decomposition of an immiscible binary polymer blend system is investigated with numerical models in two-dimensional and three-dimensional (3D). The effect of the elastic energy is included. The mechanism of the evolution of the phase separation is studied and the characteristic length R(t) is shown…
The structural properties of ${\text{Ni}}_{2}\text{FeGa}$ Heusler alloy synthesized by melt-spinning technique have been systematically studied by means of in situ heating and cooling transmission electron microscopy. It was found that the ${\text{Ni}}_{2}\text{FeGa}$ alloy was annealed into a well-defined $L{2}_{1}$…
The studies on the structure and electronic properties of hydrogenated metal embedded Al(12) cage clusters have been performed by density functional theory calculations. We have investigated aluminum cluster hydrides with 12 and 14 hydrogen atoms, respectively. Insertion of the Mg, Ca alkali metals remarkably enhances…
A room temperature ferromagnetic Fe doped ZnO bulk sample has been synthesized by co-doping 2 at% Mn with 2 at% Fe in ZnO. The final firing temperature for the preparation of the Zn 0.96 Mn 0.02 Fe 0.02 O sample is the same as the final firing temperature for the preparation of the Zn 0.98 Mn 0.02 O sample and in this…
The conditions for carbon nanotube synthesis in the bulk of arc discharges and on plasma-exposed solid surfaces are compared to reveal the main distinguishing features of the growth kinetics and explain the striking difference between the growth of the nanotubes in both cases. It is shown that this difference is due t…