Materials Literature
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Light-scattering spectra of two glasses, ${\mathrm{Ca}}_{0.4}{\mathrm{K}}_{0.6}({\mathrm{NO}}_{3}{)}_{1.4}$ and silica are measured in the frequency range $1--10000 \mathrm{GHz},$ covering temperatures from 19 K to 310 K. The low-frequency wing of the fast-relaxation spectrum is found to show a power-law behavior with…
gamma-Ray irradiation of chitosan flakes and introduction of hydrophobic chains onto hydroxyl groups are discussed. At 25 kGy, chain degradation without cross-linking reduces the molecular weight to one-fourth; however, structural characterization by FT-IR, 1H NMR, and 13C CP/MAS NMR indicates that the saccharide unit…
The selective catalytic reduction (SCR) of NO to N 2 by NH 3 over TiO 2, ZrO 2, and Al 2 O 3 was studied at 90 °C using a feed stream that was simulated to represent the effluent from a coal combustion boiler. The effects of SO 2 on the reduction of NO were studied. It is interesting that the SCR reaction was interrup…
Direct near-IR excitation of Yb(3+) 2F(7/2)-->(2)F(5/2) levels at 10126, 10138, and 10596 cm(-1) in CsMnBr3:0.5%Yb(3+) leads to three types of luminescence at cryogenic temperatures: near-IR Yb(3+) emission and green and red upconverted luminescence. The green luminescence around 20 000 cm(-1) is identified as coopera…
Poly(phenyllactide) was synthesized via the ring-opening polymerization of phenyllactide, the dimer of phenyllactic acid. Phenyllactide was synthesized by two methods, the solution phase condensation of L-phenyllactic acid and by thermal cracking of low molecular weight phenyllactic acid oligomers. The poor solubility…
We have studied the crystal structure of ${\mathrm{LaMnO}}_{3}$ under pressure up to 80 kbar at room temperature by TOF neutron diffraction. The analysis of the crystal structure as a function of pressure has revealed that the Jahn-Teller (JT) distortion is stable up to about 70 kbar. The contraction of the ${\mathrm{…
Immobilized gold colloid particles coated with a C-18 alkylsilane layer have been characterized as a substrate for surface-enhanced Raman scattering (SERS) studies of adsorption onto hydrophobic surfaces. Atomic force microscopy images, optical extinction spectra, and SERS measurements are reported as a function of ac…
The kinetic parameters for the dehydration of bentonite from Turkey, KSF and K10 were determined by using dynamic TG techniques. The Ozawa method is better for the dehydration of the clay samples than the first order equation of Coats and Redfern. The former function calculates consistently higher activation energies…
The magnetoresistive ``electron''-doped materials ${\mathrm{CaMnO}}_{3\ensuremath{-}\ensuremath{\delta}}$ $(\ensuremath{\delta}=0.06,0.11)$ have been investigated using powder neutron diffraction. The two materials are n-type semiconductors which exhibit antiferromagnetic ordering at ${T}_{N}\ensuremath{\sim}125\mathr…
Abstract Surface‐pattern formation in thin block copolymer films was investigated by utilizing a high‐throughput methodology to validate the combinatorial measurement approach and to demonstrate the value of the combinatorial method for scientific investigation. We constructed measurement libraries from images of subr…
SQUID magnetometry and M ö ssbauer spectroscopy has been combined to quantitatively characterize the superparamagnetic relaxation of MnFe 2 O 4 nanoparticles with a mean size of 7.4 nm. The key parameter for understanding and controlling the superparamagnetic properties of nanoparticles, the anisotropy constant K has…
The electronic and magnetic properties of perovskite superlattices composed of five unit-cell layers of ferromagnetic metal ${\mathrm{La}}_{0.6}{\mathrm{Sr}}_{0.4}{\mathrm{MnO}}_{3}$ and nonmagnetic band insulator ${\mathrm{SrTiO}}_{3}$ with varying layer thickness have been systematically investigated. The superlatti…
The 1963 discovery of ferroelectricity in YMnO(3) was accompanied by an experimental Curie temperature (T(c)) reported as 913 K; this value was revised to 1270 K in the following decade. Subsequently, YInO(3) was shown to be isostructural with YMnO(3) and later demonstrated to satisfy the structural criteria for ferro…
We have used cryo-transmission electron microscopy (cryo-TEM), small-angle neutron scattering (SANS), differential scanning calorimetry (DSC), and circular dichroism (CD) for microstructural characterization of amphiphiles that have a model collagen peptide headgroup. Single-tail amphiphiles and double-tail amphiphile…
Hydrogen concentration-pressure isotherms of surfactant-stabilized palladium clusters and polymer-embedded palladium clusters with diameters of 2, 3, and 5 nm are measured with the gas sorption method at room temperature. The results show that, compared to bulk palladium, the hydrogen solubility in the \ensuremath{\al…
The aging dynamics of colloidal suspensions of Laponite, a synthetic clay, is investigated using dynamic light scattering (DLS) and viscometry after a quench into the glassy phase. DLS allows to follow the diffusion of Laponite particles and reveals that there are two modes of relaxation. The fast mode corresponds to…
We present a theoretical study of the phase diagram and the structure of a fluid adsorbed in high-porosity aerogels by means of an integral-equation approach combined with the replica formalism. To simulate a realistic gel environment, we use an aerogel structure factor obtained from an off-lattice diffusion-limited c…
${\mathrm{Pr}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{3}$ $(x=0.015--0.05)$ undergoes an insulator-metal (I-M) transition below a temperature ${T}_{p}$ driven by percolation of ferromagnetic metallic clusters in a charge ordered insulating matrix. Surprisingly, the I-M t…
Abstract In situ polymerization of styrene was conducted in the presence of expanded graphite obtained by rapid heating of a graphite intercalation compound (GIC), to form a polystyrene–expanded graphite conducting composite. The composite showed excellent electrically conducting properties even though the graphite co…
55Mn nuclear magnetic resonance experiments are reported on a series of fully strained epitaxial La(2/3)Ca(1/3)MnO3 thin films on SrTiO3. We have found evidence of multiple phase segregation into ferromagnetic metallic and nonmetallic regions as well as regions that are nonferromagnetic and insulating. These insulatin…