Materials Literature
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We have investigated the anisotropic dynamic dielectric response of aligned and well-isolated single-walled carbon nanotubes using optical-pump terahertz (THz)-probe techniques. The polarization anisotropy measurements demonstrate that the THz radiation interacts only with radiation polarized parallel to the nanotubes…
Abstract We clarified the birefringence properties of poly(methyl methacrylate), poly(ethyl methacrylate), poly(isobutyl methacrylate), poly(cyclohexyl methacrylate), poly(isopropyl methacrylate), and poly( tert ‐butyl methacrylate). We demonstrated that the conformational change in polymer molecules that causes orien…
Electronic properties of electrogenerated Zn-porphyrin layers linked by an electroactive linker and immobilized on a semitransparent ITO electrode were investigated by steady-state SECM in unbiased conditions in view of the numerous possible applications of such surface. This SECM strategy took advantage of the variat…
As part of the U.S. ITER test blanket module development effort, several flow channel insert (FCI) concepts using a variety of porous SiC and SiC/SiC composites are being developed. Using porous SiC, prototypes of FCI segments as large as 0.12 m × 0.75 m × 0.015 m were fabricated and heat tested with a maximum ΔT of ~…
Abstract Water‐medium organic reactions were studied over periodic mesoporous silica (PMO) containing Pd(II) organometallic complex. This heterogeneous catalyst was achieved by Pd(II) compound coordinated with the PPh 2 ‐ligand onto the pore surface of phenylene‐bridged PMO support. This catalyst displayed ordered mes…
Abstract In this article, we report the self‐assembly of flocculation‐resistant multimolecular micelles with thermoresponsive corona from novel dendritic heteroarm star copolymers. The micelles have a core‐shell‐corona structure at room temperature according to pyrene probe fluorescence spectrometry, proton nuclear ma…
Abstract Single‐crystalline VO 2 nanowires exhibit interesting growth phenomena along three equivalent <1 $\bar {1}$ 00> directions of the C‐planes of the sapphire substrates. Under certain growth conditions, VO 2 nanowires form V‐shaped twining structures with uniform morphologies and interfaces. Due to the str…
Abstract Poly(arylene thioether)s ( PTEs ) containing 9,9′‐spirobifluorene moieties were synthesized in high yields from 9,9′‐spirobifluorene‐2,2′‐bis( N,N ‐dimethylcarbamothioate) 4 as the masked dithiol and various difluoroarenes as electrophilic monomers. All PTEs showed high thermal stability: The 10% weight loss…
Three semi-empirical force field FeCr potentials, two within the formalism of the two-band model and one within the formalism of the concentration dependent model, have been benchmarked against a wide variety of density functional theory (DFT) structures. The benchmarking allows an assessment of how reliable empirical…
Structural, electronic, and transport properties of Gd/Eu atomic chains encapsulated in single-walled carbon nanotubes (SWCNTs) are studied by using first-principles density functional theory and the nonequilibrium Green’s function method. We find that the linear single-atom Gd and Eu chains occupy an off-centered pos…
Abstract Two neutral precursor conjugated copolymers based 2,7‐diethynylfluorene and 3,6‐diethynylcarbazole units in the main chain ( PFC and PF2C ) were prepared by Hay coupling polymerization. Their cationic copolymers ( CPFC and CPF2C ) were prepared by the methylation of their diethylpropylamino groups with CH 3 I…
Natural fibers are characterized by large variation in their cross-section, both between fibers and along the length in any single “technical” fiber. This short communication describes an attempt to fully characterize the fiber cross-sectional area using single sample measurements from several fibers. This should enab…
We study the electronic states and the superconductivity in the two-dimensional 16-band $d\text{\ensuremath{-}}p$ model coupled with ${A}_{1g}$, ${B}_{1g}$, and ${E}_{g}$ local phonons and obtain the rich phase diagram including the magnetic-, charge-, and orbital-ordered phases on the parameter plane of the Coulomb a…
Pickering emulsions having internal phase of up to 93.3 vol % were prepared with PUU aqueous nanodispersion as the aqueous phase. And porous polymers based on the Pickering HIPEs were obtained. The void walls were populated by particles which were also at the interface.
The liquid-solid phase transition of the Lennard-Jones (LJ) system is investigated. It is found that the properly normalized second derivative of the interaction potential is practically constant at freezing. Using this relation a simple equation for the freezing curve is derived. The obtained equation is used to esti…
In this work, we developed a controlled oxidation reaction of vinyl-terminated self-assembled monolayers (SAMs) to carboxylic acid-terminated ones to generate radially inward wettability gradient surfaces. The hydrophobicity was introduced on a silicon wafer by SAMs of 10-undecenyltrichlorosilane, and after the initia…
We studied the in-plane magnetoresistance $R(B,T)$ anisotropy in epitaxial multilayer graphene films grown on the Si face of a $6H\text{-SiC}$ substrate that originates from steplike morphology of the SiC substrate. To enhance the anisotropy, a combination of argon atmosphere with graphite capping was used during the…
The signal-to-noise ratio (SNR) of piezoresistive transducers based on carbon nanotube field effect transistors (CNFETs) is an essential yet unexplored performance metric. Here, we show that the SNR of CNFET piezoresistors made of small band gap semiconducting SWNTs (SGS-SWNTs) depends strongly on the gate bias voltag…
Amorphous indium zinc oxide (IZO) thin film structures of varying amounts of Zn content were investigated using X-ray diffraction measurements and molecular dynamics (MD) simulations. The characteristic amorphous structure having high oxygen coordination number and edge-shared polyhedra were confirmed using both techn…
Abstract Molecular forms of silica based on polyethoxysiloxane, silicasol, and tetraethoxysilane, being prospective fillers for polymer nanocomposites were prepared and studied thoroughly by gel permeation chromatography (GPC), viscometry, dynamic light scattering (DLS), thermomechanics, and wide angle X‐ray scatterin…