Materials Literature
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A rapid yet simple methodology to synthesize carbon nanotubes (CNTs) in a room temperature environment has been demonstrated using an inductive heating system. Substrates of either heavily doped silicon or nickel-coated, lightly doped silicon have been used to synthesize CNTs using Fe as the catalyst. Aligned carbon n…
A transverse Peltier effect has been observed in artificially created tilted Pb–Bi2Te3 multilayer structures. Multilayer stacks consisting of alternating layers of Pb and n-type Bi2Te3 have been prepared by a heating procedure and showed large thermoelectric anisotropy up to ΔS≅200μV∕K, depending on thickness ratio p=…
The core of the matter: Reactions of Ag(PhCO2) with (Me2N)C6H4(SSiMe3) and E(SiMe3)2 (E=S, Se) lead to three clusters with new silver chalcogenide cores. For example, the core of [Ag88Se12(SC6H4NMe2)63(PPh3)6] (see picture) consists of bent hexagonal layers of selenium and sulfur atoms (yellow), with interstitial silv…
A series of low molecular weight aliphatic biodegradable polyesters were synthesized from 1,3-propanediol and dibasic acids by thermal polycondensation, in the bulk without catalyst in N2 atmosphere at 150°C. The synthesized aliphatic polyesters were characterized by 1H-NMR, FT-IR, solubility, solution viscosity, gel…
The viscosity, tack, and peel strength of a natural rubber (SMR 20)–based pressure-sensitive adhesive (PSA) was studied using coumarone-indene resin as the tackifier. The resin loading was varied from 0–80 parts per hundred parts of rubber (phr). Toluene was used as the solvent throughout the experiment. The viscosity…
A spectroscopic study of the optical nonlinearity of PbSe colloidal solutions was performed with the Z-scan technique at wavelength intervals of 1200–1350 and 1540–1750nm. While nonlinear absorption remains below the detection threshold, the third order nonlinear refractive index n2 shows clear resonances, somewhat bl…
Abstract The structural, optical, and electronic properties of a series of lithium rare earth polyphosphates [LiLn(PO 3 ) 4 ] [Ln = La ( 1 ), Eu ( 2 ), Gd ( 3 )] have been investigated by means of single‐crystal X‐ray diffraction, elemental analyses, and spectroscopic measurements, as well as calculations of energy‐ba…
Electroluminescence (EL) and electrical properties of nanocrystalline porous silicon (PS) diodes have been sufficiently improved by introducing high pressure water vapor annealing into the active PS layer. The EL emission is significantly enhanced without affecting the operating voltage. In addition, the fabricated de…
We present a systematic investigation of the magnetoreflectance $R(\ensuremath{\omega},B)$ of highly oriented pyrolytic graphite in magnetic field $B$ up to $18\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. From these measurements, we report the determination of lifetimes $\ensuremath{\tau}$ associated with the lowest Landau…
Abstract Reversible addition–fragmentation chain transfer (RAFT) mediated radical polymerizations of allyl methacrylate and undecenyl methacrylate, compounds containing two types of vinyl groups with different reactivities, were investigated to provide hyperbranched polymers. The RAFT agent benzyl dithiobenzoate was d…
Dielectric spectroscopy was used in this study to examine CaCu3Ti4O12 polycrystalline samples. The analysis involved systems presenting low non-Ohmic properties, and the grain’s internal domain was evaluated separately from the contribution of barrier-layer capacitances associated with Schottky-type barriers in this t…
Nanoporous poly(4-fluorostyrene) templates on gold-coated silicon/silicon oxide substrates were prepared by the electric field alignment of poly(4-fluorostyrene)-b-poly(d,l-lactide) block copolymer thin films followed by mild degradation of the polylactide phase using dilute aqueous base. Electrochemical deposition of…
Highly ordered transparent self-supporting films of layered double hydroxides (LDHs) with a size of the order of cm2 have been obtained by a simple method; the chemical composition of both the layers and interlayers can be readily tuned, as demonstrated by the preparation of [ZnAl-NO3] LDH, [NiAl-NO3] LDH and [Tb(EDTA…
We report ab initio density functional theory calculations of generalized planar fault energies of fcc Cu–xAl (x=0, 5.0, and 8.3at.%) alloys. We investigate the effects of substitutional solute Al on the unstable intrinsic γus and twin γut stacking fault energies (SFEs). Our results reveal an increased tendency of Cu–…
A lipid-encapsulated perfluorocarbon nanoparticle molecular imaging contrast agent that utilizes a paramagnetic chemical exchange saturation transfer (PARACEST) chelate is presented. PARACEST agents are ideally suited for molecular imaging applications because one can switch the contrast on and off at will simply by a…
We study the relaxation of a spin density injected into a two-dimensional electron system with generic spin-orbit interactions. Our model includes the Rashba as well as linear and cubic Dresselhaus terms. We explicitly derive a general spin-charge coupled diffusion equation. Spin diffusion is characterized by just two…
Two-photon excitation is gaining rapidly in interest and significance in spectroscopy and microscopy. Here we introduce a new approach that suggests versatile optical labels suitable for both one- and two-photon excitation and also two-photon-excited ultrasensitive, nondestructive chemical probing. The underlying spec…
We use an "equation-free", coarse-grained computational approach to accelerate molecular dynamics-based computations of demixing (segregation) of dissimilar particles subject to an upward gas flow (gas-fluidized beds). We explore the coarse-grained dynamics of these phenomena in gently fluidized beds of solid mixtures…
Electromechanical hysteresis loop measurements in piezoresponse force microscopy (PFM) [piezoresponse force spectroscopy (PFS)] have emerged as a powerful technique for probing ferroelectric switching behavior on the nanoscale. Interpretation of PFS data requires the relationship between the domain parameters and PFM…
Ferroelectric BiFeO3 thin films were grown on Pt∕TiO2∕SiO2∕Si substrates by pulsed-laser deposition. From the x-ray diffraction analysis, the BiFeO3 thin films consist of perovskite single phase, and the crystal structure shows the tetragonal structure with a space group P4mm. The BiFeO3 thin films show enhanced elect…