Materials Literature
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2,2,′3,3′-Biphenyltetracarboxylic dianhydride (2,2,′3,3′-BPDA) was prepared by a coupling reaction of dimethyl 3-iodophthalate. The X-ray single-crystal structure determination showed that this dianhydride had a bent and noncopolanar structure, presenting a striking contrast to its isomer, 3,3,′4,4′-BPDA. This dianhyd…
Shear banding of wormlike micelle solution has been studied in the context of constitutive instability of the Johnson-Segalman (JS) model plus Newtonian stress. We have incorporated a higher-order gradient term of the deformation-rate tensor into the JS model for investigating the dynamics of a mechanical interface in…
To obtain molecules that can target malignant cells, two series of new meso glucosylporphyrins bearing amino acid residues are synthesized in four steps. The first series contained n meso glycosyl moieties and (4 − n ) alanyl groups on the ortho or para positions of the meso phenyl. In the second series, the carbohydr…
A series of poly(styrene-block-ferrocenyldimethylsilane) copolymers (SF) with different relative molar masses of the blocks were prepared by sequential anionic polymerization. The bulk morphology of these polymers, studied by TEM and SAXS, showed well-ordered lamellar and cylindrical domains as well as disordered mice…
Memory retention characteristics of metal–ferroelectric–metal–insulator–semiconductor (MFMIS) field effect transistors (FETs) were investigated in detail using a simple structure, referred to as quasi-MFMIS, in which one electrode of the metal–ferroelectric–metal (MFM) capacitor is connected to a gate electrode of a c…
A multiblock copoly(ester–ether) consisting of poly(l-lactic acid) (PLLA) and poly(oxypropylene-co-oxyethylene) (PN) was prepared and characterized. Preparation was done via the solution polycondensation of a thermal oligocondensate of l-lactic acid, a commercially available telechelic polyether (PN: Pluronic-F68), an…
The etching effects on the CdTe surface treated by the different chemical etchants, such as 2% Br-methanol (BM) and 2% Br-20% latic acid in ethylene glycol (BLE) solutions are studied by both photoluminescence (PL) and atomic force microscopy. After etching, the dielectric materials ZnS and CdZnTe are used for the pas…
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…