Materials Literature
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Far-infrared (FIR) reflection measurements have been employed to study the long-wavelength optical phonon properties in cubic MgZnO thin films grown by reactive electron beam evaporation on sapphire substrates. The frequencies of the optical phonons with T2 symmetry are obtained by calculating the FIR reflection spect…
The reactive ion etching of poly(ethylene terephthalate) using various gas compositions was examined. A radio frequency power supply operating at 30 kHz was used to produce plasmas from the following gases and 50:50 gas mixtures: Ar, N 2, O 2, Ar−N 2, Ar−O 2, and N 2 −O 2 . Exposure times were typically 10, 20, and 30…
The Pt hillock in a Pt/Ti electrode stack has been the main concern in ferroelectric random access memory due to the reliability problem. The origin of the hillock formation is the compressive stress, and the main mass transport mechanism for hillock formation is the grain boundary diffusion for thin films with a colu…
The 1 H NMR relaxivity of o - and p -dinitroxide-substituted phthalate esters and a series of nitroxyl-functionalized poly(propylene imine) dendrimers has been measured in acetonitrile and methanol. Studies of dinitroxide relaxivity indicate that the electron exchange rate has only a small effect on relaxivity. Outer-…
Dendronized polymers (DenPol's) up to generation 3 were equipped with NCN−palladium and −platinum pincer complexes at their peripheries, using active ester chemistry. The palladium compounds catalyze the aldol condensation of benzaldehyde with methyl isocyanoacetate and show a generation-independent activity.
We present the first examples of ordered macroporous carbons (OMCs) containing metal nanoparticles and hierarchical pore structures. The sol−gel polymerization of formaldehyde with potassium 2,4-dihydroxybenzoate within the void spaces of an ordered array of polystyrene spheres, followed by ion exchange, template remo…
Experimental results demonstrating Peltier cooling below 10 K are reported, using crystals of the thermoelectric cerium hexaboride (CeB6). Direct measurements of the Peltier cooling showed δT up to ∼0.2 K in magnitude at T∼4–5 K. All three kinetic parameters: resistivity (ρ), heat conductivity (k), and Seebeck coeffic…
A new class of electrochemical sensors, namely, electrodes based on diamond paste, was designed using monocrystalline diamond (natural diamond 1 microm and synthetic diamond, 50 microm (synthetic-1) and 1 microm (synthetic-2)) powder and paraffin oil. The characterization of the electrodes was performed using cyclic v…
In the present study we experimentally investigate bubble dynamics after laser induced shock wave exposure in the vicinity of salt crystals suspended in water. High-speed microscopic images show aspherical collapse and rebound of single and multiple bubbles with initial radii between 5 and 150 μm. Radius time curves o…
Ferromagnetism is observed at and above room temperature in pulsed laser deposited epitaxial films of Co-doped Ti-based oxide perovskite (La0.5Sr0.5TiO3−δ). The system has the characteristics of an intrinsic diluted magnetic semiconductor (metal) at low concentrations (<∼2%), but develops inhomogeneity at highe…
We report the preparation of biomimetic honeycomb-structured porous films. These regular arrays were obtained by casting block copolymers composed of polystyrene and poly(acryloyl phosphorylcholine), so that they mimicked a cell membrane. The size of the pores and regularity of the hexagonal array is strongly dependen…
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The stability of microstructure and of microchemistry in melt-spun precipitation-hardened Sm(Co,Fe,Cu,Zr)z magnets at high temperature and its effect on the magnetic properties, especially the coercivity at room temperature, were investigated by transmission electron microscopy, nanoprobe chemical analysis, and magnet…
The local environment around magnetic impurity atoms was reported to be unchanged in a structural phase transition of nanocrystalline Co-doped ferromagnetic ${\mathrm{TiO}}_{2}.$ Our ab initio density functional theory investigations show that the substitutional Co ions incorporated into ${\mathrm{TiO}}_{2}$ rutile te…
Rare earth ions; Nd, Sm, Gd, and Dy, are substituted at the bismuth site in bismuth iron titanate, a four-layered compound which belongs to bismuth layer structured ferroelectrics. A solid-state sintering route was adopted in synthesizing the materials. X-ray diffraction indicates the formation of single-phase materia…
Ab initio electronic structure calculations based on density functional theory are performed for ${\mathrm{Si}}_{n}\mathrm{Fe}$ clusters to determine stable structures. Our results show that these clusters can form the building block for Fe-encapsulated Si-nanotubes. The ${\mathrm{Si}}_{10}\mathrm{Fe}$ and ${\mathrm{S…
We present the self-interaction corrected local spin density (SIC-LSD) electronic structure and total energy calculations, leading also to Fe valencies of the ground state configurations, for the double perovskites such as ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6},{\mathrm{Ba}}_{2}{\mathrm{FeMoO}}_{6},{\mathrm{Ca}}_{2}{\…
Polarization dependences of Rayleigh and surface-enhanced Raman scattering (SERS) were measured for individual Ag nanoparticles on which Rhodamine 6G molecules were adsorbed. It was found that the polarization dependencies of surface plasmon bands generated by the aggregation of SERS active Ag particles are well synch…
Microtubule sensors for glucose, urea, and triglyceride were fabricated based on poly(styrene sulfonate)-polyaniline (PSS-PANI) composites synthesized within the pores of track-etched polycarbonate membranes. The synthesis of a sufficiently thick and conducting PSS-PANI film at pH 5 provided the advantage of immobiliz…
The novel [Co(C5F6HO2)2·2H2O·CH3(OCH2CH2)4OCH3] low-melting adduct has been synthesized and characterized. Very mild heating results in the anhydrous Co(hfac)2tetraglyme liquid and thermal stable complex that evaporates intact. This adduct has proven to be a well-suited precursor for MOCVD of cobalt oxide films.