Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteA Novel Fabrication of Ultrathin Poly(vinylamine) Films with a Molecularly Smooth SurfaceTakeshi Serizawa, Kazuya Yamamoto, and Mitsuru AkashiView Author Information Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University, 1-21-40 Kori…
In this work, the Young’s, E, and shear, μ, moduli of Ti3SiC2 are measured ultrasonically in the 20–300 K temperature range. At room temperature, Young’s, ERT, and shear, μRT, moduli are 322±2 and 133.6±0.8 GPa, respectively. Poisson’s ratio is 0.2. Both moduli increase slowly with decreasing temperature and plateau o…
We report the results of systematic studies of the effect of thin film deposition conditions, such as deposition temperature, oxygen pressure during deposition, etc., on the microstructural, magnetic, and microwave properties of pulsed laser deposited epitaxial thin films of barium ferrite on single crystal sapphire s…
Temperature and magnetic field dependent magnetization studies of ferrimagnetic NBu 4 [Fe II Fe III (ox) 3 ] are presented, which demonstrate that the negative magnetization phenomenon in the field-cooled mode, observed only in magnetic fields lower than 5 kOe and at temperatures below 30 K. The absolute value of the…
The vibrational modes of the β-Si3N4 Raman active bands appearing in the wave number region between 110 and 1100 cm−1 were determined by the polarization and the crystallographic orientation dependence of the Raman intensities of the bands using micro-Raman spectroscopy. The laser beam was focused onto a single grain…
The polymer liquid crystal PLC is the PET/0.6PHB copolymer; PET=poly(ethylene terephthalate), PHB=ρ-hydroxybenzoic acid (LC): 0.6=the mole fraction of PHB. This is a multiphase system with PHB-rich islands in a PET-rich matrix. Tensile creep compliance was measured isothermally from 20 °C to 160 °C in 10 °C intervals.…
The zone-drawing (ZD) method was applied three times to the melt-spun poly(L-lactic acid) (PLLA) fibers of low molecular weight (Mv = 13,100) at different temperatures under various tensions. The mechanical properties and superstructure of the ZD fibers were investigated. The resulting ZD-3 fiber had a draw ratio of 1…
A novel bis(ether anhydride) monomer, 9,9-bis[4-(3,4-dicarboxyphenoxy)phenyl]fluorene dianhydride (4), was synthesized from the nitrodisplacement of 4-nitrophthalonitrile by the bisphenoxide ion of 9,9-bis(4-hydroxyphenyl)fluorene (1), followed by alkaline hydrolysis of the intermediate tetranitrile and dehydration of…
Tubular polypyrrole (PPy) could be synthesized by in situ doping polymerization in the presence of β-naphthalene sulfonic acid (NSA) as dopant. The resultant tubular PPy–NSA not only exhibits high room temperature conductivity (ςRT = 10 S/cm) but is also soluble in m-cresol. The molecular structure of PPy–NSA is ident…
We found that very high concentrations (up to 20% vol) of nitrogen in the ethanol/hydrogen gas mixture do not prejudice the diamond quality as determined by Raman spectroscopy. Nitrogen addition also increases the diamond growth rate, as was previously reported at low nitrogen concentrations. We observed that after a…
We investigate the evolution of electronic structure with dimensionality (d) of Ni-O-Ni connectivity in divalent nickelates, NiO $(3\ensuremath{-}d),$ ${\mathrm{La}}_{2}{\mathrm{NiO}}_{4},$ ${\mathrm{Pr}}_{2}{\mathrm{NiO}}_{4}$ $(2\ensuremath{-}d),$ ${\mathrm{Y}}_{2}{\mathrm{BaNiO}}_{5}$ $(1\ensuremath{-}d)$ and ${\ma…
Magnetism and transport properties are reported for hollandite-type manganese oxides ${\mathrm{K}}_{1.5}{(\mathrm{H}}_{3}{\mathrm{O})}_{x}{\mathrm{Mn}}_{8}{\mathrm{O}}_{16}$ $(0<x<0.5)$ having a tunnel structure. Three phase transitions are observed at ${T}_{1}$ (varies from 180 to 250 K, very sensitive to the s…
Tetrathiafulvalene analogues involving dihexyloxythiophene ( 1 ), ethylenedioxythiophene ( 2 ), and bis(3,4-dihexyloxy-2-thienyl)ethylene ( 3 ) as conjugating spacer and diversely substituted at the 1,3-dithiole ring (R) have been synthesized. Electronic absorption spectra show the expected decrease of HOMO−LUMO gap w…
The excess low-frequency $(1/f)$ electrical noise of three representative half-metallic oxides, ${\mathrm{CrO}}_{2},$ ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4},$ and ${\mathrm{La}}_{2/3}{\mathrm{Sr}}_{1/3}{\mathrm{MnO}}_{3},$ has been studied as a function of the temperature (5--300 K) and a magnetic field (up to 12 T). In $…
The volumetric heat capacity and thermal conductivity of silicon-dioxide films prepared using low-pressure chemical vapor deposition (LPCVD) are measured. The measurements employ the 3ω technique, which is extended to determine the thermal conductivity anisotropy and volumetric heat capacity of thin dielectric films.…
The reflectance of highly reduced ${\mathrm{SrTiO}}_{3\ensuremath{-}x}$ has been studied in samples where the carrier concentration---or oxygen-vacancy density --- varies from about ${10}^{18}$ to ${10}^{21} {\mathrm{cm}}^{\ensuremath{-}3}.$ Several phonon modes are strongly influenced by oxygen-vacancy density. Oxyge…
Electron-paramagnetic-resonance (EPR) studies in radiation damaged diamond enriched to 5% ${}^{13}\mathrm{C}$ have resulted in the identification of the nearest-neighbor divacancy center. It is the isotopic enrichment, and consequent observation of ${}^{13}\mathrm{C}$ hyperfine lines, that has permitted the structure…
Polycarbonates were synthesized by ring-opening copolymerizations of trimethylene carbonate (TMC) with 1,2- O -isopropylidene- d -xylofuranose-3,5-cyclic carbonate (IPXTC). Subsequent deprotection of the ketal protecting groups gave controlled quantities of vicinal diol pendant groups. Studies of TMC/IPXTC copolymeriz…
Nanocomposites have been made by mixing soft particles (polymer latex) with hard particles (silica) in aqueous dispersions and extracting water to produce a dense film. Segregation between the two kinds of particles can be controlled, and even suppressed. The elongational modulus is strongly increased by such fillers…
Angular measurements of magnetic resonance are used to investigate the surface anisotropy field as well as the exchange anisotropy field in spherical MnFe2O4 magnetic nanoparticles as a function of temperature and particle diameter (D). The resonance field is a combination of angular dependent and angular independent…