Materials Literature
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The phase behavior of deuterated polystyrene- block -poly( n -pentyl methacrylate) copolymers (dPS−PnPMA) was investigated by using small-angle X-ray (SAXS) and neutron (SANS) scatterings and rheology. This block copolymer exhibited a closed-loop type of phase behavior as did hydrogenated PS−PnPMA copolymers. The clos…
Abstract Raman spectra were recorded in the range 400–1800 cm −1 for a series of 15 mixed [tetrakis(4‐ tert ‐butylphenyl)porphyrinato](2,3‐naphthalocyaninato) rare earth double‐deckers M(TBPP)(Nc) (M = Y; La–Lu except Pm) using laser excitation at 632.8 and 785 nm. Comparisons with bis(naphthalocyaninato) rare earth c…
The condensation and phase transitions of hydrogen molecules confined in single-walled carbon nanotubes have been studied using ab initio calculations and molecular dynamics simulations. At low temperature the van der Waals surface of a narrow (5,5) tube forces the ${\mathrm{H}}_{2}$ molecules to form quasi-one-dimens…
Measurements of the electrical resistivity $\ensuremath{\rho}$ as a function of temperature T and pressure $P(P<~1.6\mathrm{GPa})$ are reported on ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{NiO}}_{4}$ $(0<~x<~1.2).$ A compositionally induced $M\ensuremath{-}I$ transition occurs for $x>~0.9.…
Abstract Mesoporous silicon oxynitride materials, which were highly ordered and had high nitrogen content, were prepared by heat treatment of fresh SBA15 precursors in flowing ammonium at high temperatures.
Abstract We investigated the spectral features of the ν(NC) bands when 4,4′‐biphenyl diisocyanide (BPDNC) is adsorbed on gold nanoparticle surfaces by surface‐enhanced Raman scattering (SERS). The mode of adsorption of BPDNC on gold nanoparticles was found to change with the bulk concentration. At low concentrations o…
This paper focuses on controlling adsorption of gold nanoparticles onto polymer nanosheets. Amphiphilic copolymers, poly( N -dodecyl acrylamide- co -4-vinyl pyridine)s (p(DDA/VPy)s), were synthesized and the ultrathin p(DDA/VPy) films were prepared by the Langmuir−Blodgett (LB) technique. Gold nanoparticles were immob…
The chromonic lyotropic liquid crystal formed from an aqueous solution of the azo dye C.I. Direct Blue 67 was investigated by means of a temperature-controlled X-ray diffraction technique, polarized optical microscopy, and UV−visible spectroscopy. The dye molecules form columnar aggregates even at low concentrations.…
All epitaxial oxide magnetic tunnel junctions, ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}/{\mathrm{SrTiO}}_{3}/{\mathrm{SrRuO}}_{3}$ trilayer films, composed of ferromagnetic and metallic electrodes were fabricated on STO(001) substrates. Inverse tunnel magnetoresistance (TMR), i.e., higher and lower ju…
A new mesoporous silica structure with cubic Iad symmetry has been synthesized. The structure has very large unit cell dimensions, up to 250 A in the as-synthesized form and 222 A after calcination, and the surface area is around 700 m2/g. The syntheses were done according to well-established synthesis conditions with…
Nitrogen is the most important defect in diamond forming a series of aggregates that are used to characterize different types of diamond. Aggregation of substitutional N and O are investigated using detailed ab initio plane-wave calculational procedures. Different charge states of the N-N substitutional pair (the A ce…
Abstract We propose a new Raman pressure scale based on the shift with pressure of the fundamental Raman band of micrometer‐sized diamonds. First, we confirmed that the pressure slope of the triply degenerate diamond phonon behaves in a similar fashion to that of the bulk. Our measurements were calibrated Raman agains…
The rheological properties of a sunflower protein isolate (SFPI) were studied, and injection-molded pieces were produced. Various mixtures of SFPI (100 parts by weight), glycerol (10−50 parts), water (10−50 parts), and sometimes sodium sulfite (used as reducing agent, 1−10 parts) were studied. Power-law-type modeling…
Abstract The electrocatalytic oxidation of methanol at a glassy carbon electrode modified by a thin film of poly( o ‐aminophenol) (PoAP) containing Pt, Pt‐Ru and Pt‐Sn microparticles has been investigated using cyclic voltammetry as analytical technique and 0.10 M perchloric acid as supporting electrolyte. It has been…
Modification of porous silica with aminopropylalkoxysilanes was studied under an inert atmosphere by a gas-phase technique, atomic layer deposition. Trifunctional γ-aminopropyltrimethoxysilane and γ-aminopropyltriethoxysilane (APTS), bifunctional γ-aminopropyldiethoxymethylsilane (APDMS), and monofunctional γ-aminopro…
We present the quasiparticle band structure and the optical excitation spectrum of bulk LiF and the LiF(001)-(1\ifmmode\times\else\texttimes\fi{}1) surface. First, we calculate the ground-state geometry of the bulk and the surface using density-functional theory within the local-density approximation. Next, applying t…
Strong polarization-sensitive anisotropy of the optical absorption in the visible and infrared spectral range is observed in porous silicon (PSi) layers formed from bulk (110) Si wafers. It is shown that the anisotropy of the absorption via band-to-band and intraband (Drude-like) electronic transitions is consistent w…
The growth or dissolution of small gas bubbles (R0<15 microm) by rectified diffusion in nearly saturated liquids, subject to low frequencies (20 kHz<f<100 kHz) and high driving acoustic fields (1 bar<p<5 bars), is investigated theoretically. It is shown that, in such conditions, the rectified diffusion threshold radiu…
Coupled mechanical and electronic behaviours of single walled open carbon nanotubes (CNTs) under applied electric field and tensile loading are investigated by the use of quantum mechanics as well as quantum-molecular dynamics techniques based on the Roothaan–Hall equations and the Newton motion laws. Different failur…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTFourier Transform Infrared Investigation of the Deformation Behavior of Montmorillonite in Nylon-6/Nanoclay NanocompositeLeslie S. Loo and Karen K. GleasonView Author Information Department of Chemical Engineering, Massachusetts Ins…