Materials Literature
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The stability of diamond under pressure and the structure of hypothetical high-pressure phases have been a controversial issue for a long time. “Will diamond transform under megabar pressures?” asked Yin and Cohen in the title of their paper [Phys. Rev. Lett. 50, 2006 (1983)] which attempted to predict an answer to th…
An atomistic direct diagonalization pseudopotential approach has been used to analyze the optical excitation spectra of CdSe quantum dots for up to 1.5 eV about the band gap. Good agreement is obtained with experiment for all the eight excitonic transitions, without resorting to fitting to the experimental data on dot…
The dielectric behavior of alkylcyanobiphenyls (5CB and 8CB) confined in porous matrices with randomly oriented, interconnected pores with two different mean pore sizes (1000 and 100 \AA{}) has been investigated by means of broadband dielectric spectroscopy in the frequency range from 1 mHz to 1.5 GHz. The confinement…
Magnetization and electrical resistivity studies have established that ${\mathrm{La}}_{0.5}{\mathrm{Ba}}_{0.5}{\mathrm{CoO}}_{3\ensuremath{-}\ensuremath{\gamma}}$ (LaBaC) is a metallic ferromagnet whereas ${\mathrm{Pr}}_{0.5}{\mathrm{Ba}}_{0.5}{\mathrm{CoO}}_{3\ensuremath{-}\ensuremath{\gamma}}$ (PrBaC) is a magnetic…
Wide band dielectric and electro-optic spectroscopy of an antiferroelectric liquid crystal (AFLC) has been carried out over a range of frequencies from 1 kHz to 1 GHz. The AFLC sample under investigation possesses a variety of different ferri-, ferro-, and antiferro-electric phases. Dielectric spectroscopy of the LC c…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTImmobilization of Soluble Metal Complexes with a Hydrogen-Bonded Organic Network as a Supporter. A Simple Route to Microporous Solid Lewis Acid CatalystsTomoya Sawaki, Takehisa Dewa, and Yasuhiro AoyamaView Author Information CREST Japan Science and Technology Corporat…
In this work the level of continuity and cocontinuity for blends of HDPE/PS prepared on a twin-screw extruder have been studied by both morphology and dissolution studies. Addition of SEBS as an interfacial modifier results in a shift of the percolation threshold for dispersed PS to higher concentrations. The region o…
Glasses of composition ( x ‐ 1)PbO(100 ‐ x )GeO 2 1Ln 2 O 3 , with x = 30 mol% (Ln = Nd, Eu, Er), 40 mol% (Ln = Pr, Nd, Sm, Eu, Dy, Ho, Er, Tm), and 50 mol% (Ln = Eu, Er), have been prepared by quenching the oxidic melts. From the optical absorption and emission spectra in the ultraviolet‐visible‐near‐infrared (UV‐VIS…
Backscatter factors were determined for x-ray beams relevant to diagnostic radiology using Monte Carlo methods. The phantom size considered most suitable for calibration of dosimeters is a cuboid of 30 x 30 cm2 front surface and 15 cm depth. This phantom size also provides a good approximation to adult patients. Three…
Inhibition of mild steel corrosion by sodium dodecyl benzene sulfonate ((C12H25C6H4SO3Na [SDBS]) and sodium oleate (CH3[CH2]7CH=CH[CH2]7COONa) in acidic solutions was investigated using a potentiostat, a lock-in amplifier, a contact angle goniometer, a Fourier transform infrared (FTIR) spectrometer, and an ultraviolet…
The main goal of this research news article is to describe how different kinds of topological defects that exist in a silicate liquid crystal seed can initiate and direct the growth of particular forms of mesoporous silica. This avenue of investigation emerged from the results of scanning electron microscopy (SEM), tr…
Tartrate and succinate anions have been intercalated in Zn(3)Al and Zn(2)Cr LDHs. The preparations using either coprecipitation, anion exchange, or reconstruction methods are described. In the case of tartrate-containing LDH, coprecipitation and reconstruction methods have proved to be very limited to lead to pure mat…
The multinuclear complexes 1,3,5-[ trans -I(Et 3 P) 2 PtC≡C] 3 C 6 H 3 ( 1 ) and 1,2,4,5-[ trans -I(Et 3 P) 2 PtC≡C] 4 C 6 H 2 ( 2 ) were prepared via σ-acetylide synthetic methodologies by reaction of tri- and tetraethynylbenzene with diiodobis(triethylphosphine)platinum. The combination of this synthetic coupling st…
The nuclear and magnetic structures of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ have been studied by neutron powder diffraction methods for the compositions $x=0.06,$ 0.15, 0.175, 0.25, and 0.33. At low concentrations of Ca $(x=0.06)$ the oxidized sample contains cation vacancies and the s…
The structure of sodium tetrasilicate (Na 2 Si 4 O 9 ) glasses containing 0 to 10 wt% water was investigated by a combination of Raman, IR, and NMR methods. Both the 29 Si magic angle spinning NMR data and Raman spectra in the Si-O stretching region clearly show that water depolymerizes the silicate network of the gla…
Two‐phase composites consisting of LaPO 4 or CePO 4 and alumina, mullite, or zirconia were found to be machinable; i.e., they can be cut and drilled using conventional tungsten carbide metal‐working tools. Single‐phase LaPO 4 was also machinable. Measurements of drilling rates, grinding rates, and normal forces are us…
Human transferrin was covalently coupled to ultrasmall superparamagnetic iron oxide (USPIO) particles, and the transferrin-USPIO obtained was investigated in vivo in experimental SMT/2A tumor-bearing rats (rat mammary carcinoma). Physicochemical characterization showed an overall size of 36 nm (DLS) with a core size o…
Abstract Biodegradable polymers are by definition those that degrade as a result of the action of microorganisms and/or enzymes. The rate of this biodegradation may vary from hours to years depending on the molecular architecture of the polymer in question. Biopolymers like lignin take years to degrade while many prot…
Scanning electrochemical microscopy with submicron resolution shows that the local current density for dissolution of certain MnS inclusions in stainless steel can be extremely high (>1 A cm −2 and appears to be chloride‐catalyzed, a result not anticipated by previous work on chemically prepared MnS. The dissolution f…
A wettability gradient was prepared on lowdensity polyethylene (PE) sheets by treating them in air with a corona from a knife-type electrode the power of which increased gradually along the sample length. The PE surfaces oxidized gradually with the increasing corona power and a wettability gradient was created on the…