Materials Literature
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The ability to attach redox-active molecules to oxide surfaces in controlled architectures (distance, orientation, packing density) is essential for the design of a variety of molecular-based information storage devices. We describe the synthesis of a series of redox-active molecules wherein each molecule bears a benz…
A chemical vapor deposition hydrogen/methane/nitrogen feedgas mixture with unconventional high methane (15% CH4 by volume) normally used to grow ultrahard and smooth nanostructured diamond films on Ti–6Al–4V alloy substrates was modified to include diborane (10% B2H6 in hydrogen) for boron doping. The flow rates of N2…
Abstract The increasing use of products from recycled polymers, or from blends with recycled polymers exposed to the outdoors, implies the need for good weathering resistance. This is particularly important when the recycled material comes, in turn, from products exposed during their lifetime to the sun. In this case…
The structural evolution of Keggin-type heteropolyoxomolybdates (HPOM) during thermal treatment in propene and in propene and oxygen in the temperature range from 300 to 773 K was investigated by in situ X-ray diffraction (XRD) and in situ X-ray absorption spectroscopy (XAS) combined with mass spectrometry. During tre…
Electrical carrier-injection and transport characteristics of photochromic diarylethene thin films were investigated. Injected and transported carriers (injected current) to the diarylethene film were increased with the existence ratio of the closed-ring form, which was one isomerization state of the diarylethene mole…
High-quality (0001)-oriented zinc oxide (ZnO) micropatterns, 5-μm-wide microlines and 5-μm-diam microdot arrays, have been prepared on (111) Au-coated (100) Si wafer substrates by electrodeposition at 333 K in zinc nitrate aqueous solution and industrially employed positive type photoresist techniques. The ZnO micropa…
Synthetic molecules bearing phosphonic acid groups can be readily attached to oxide surfaces. As part of a program in molecular-based information storage, we have developed routes for the synthesis of diverse porphyrinic compounds bearing phenylphosphonic acid tethers. The routes enable (1) incorporation of masked pho…
We use the adsorption probabilities of molecular nitrogen and oxygen to study the physi- and chemisorption on small silver particles. The physisorption of nitrogen is governed by the structure of the particle surface. The sticking of oxygen additionally involves the electronic configuration of the metal cluster. At 77…
Abstract Here we describe the development of a process, and the resulting mechanical properties, for hot‐compacted sheets of woven poly(ethylene terephthalate) (PET) multifilaments. Investigation of the various processing parameters showed that a key aspect was the time spent at the compaction temperature, termed the…
With decreasing device dimensions, the performance of carbon nanotube field-effect transistors (CNFETs) is limited by high OFF currents except at low drain voltages. Introducing an asymmetry between source and drain electrostatics can improve the performance, reducing OFF currents and extending the usable range of dra…
A stable radical-substituted radical ion with strongly ferromagnetic intramolecular interaction (J) between the radical and radical ion sites is an attractive spin building block of organic magnets. We prepared 2-nitronyl nitroxide-substituted 5,10-diphenyl-5,10-dihydrophenazine radical cation, 1+. The 1+ salt was sta…
Single-walled carbon nanotubes (SWNTs) have been studied on a Si(100)-2×1:H surface using an ultrahigh-vacuum (UHV) scanning tunneling microscope (STM). Dry deposition of SWNTs in situ establishes the pristine interface necessary to elucidate fundamental physical and electronic interactions between SWNTs and silicon.…
A homologous series of first- to fourth-generation (G1-G4) dendronized macromonomers, 5, 7, 10, and 12, was synthesized, and their polymerization behavior under radical conditions investigated. These conditions were thermally induced radical polymerization (TRP) and atom-transfer radical poymerization (ATRP). TRP was…
To examine the effects of molecular structure on charge storage in self-assembled monolayers (SAMs), a family of redox-active molecules has been prepared wherein each molecule bears a tether composed of a tripodal linker with three protected thiol groups for surface attachment. The redox-active molecules include ferro…
Abstract Cellulose was dissolved in 6 wt % NaOH/4 wt % urea aqueous solution, which was proven by a 13 C NMR spectrum to be a direct solvent of cellulose rather than a derivative aqueous solution system. Dilute solution behavior of cellulose in a NaOH/urea aqueous solution system was examined by laser light scattering…
Many polymers form disordered structures resembling tangled spaghetti, but recent advances in polymer synthesis have increasingly enabled researchers to control their molecular and supramolecular arrangements. In their Perspective, Bucknall and Anderson highlight some of these advances, focusing specifically on block…
The structural and luminescence properties of erbium doped zirconium oxide prepared by the sol-gel processes were analyzed. The annealed powders presented a concentration dependent crystallite sizes and crystalline phase, ranging from 28 to 46 nm and from 40 to 96% for the monoclinic phase, respectively. Green (545 nm…
[micro-Tris(1,4-bis(tetrazol-1-yl)butane-N4,N4')iron(II)] bis(hexafluorophosphate), [Fe(btzb)(3)](PF(6))(2), crystallizes in a three-dimensional 3-fold interlocked structure featuring a sharp two-step spin-crossover behavior. The spin conversion takes place between 164 and 182 K showing a discontinuity at about T(1/2)…
An isotropic 207Pb NMR spectrum corresponding to the glassy matrix with spherical shell type Pb shifts from the cubic sites, as well as an anisotropic spectral component corresponding to polar nanoclusters with a Pb shift parallel to the [111] direction, have been observed in a PbMg(1/3)Nb(2/3)O3 (PMN) single crystal.…
The electronic structure of an isolated oxygen vacancy in ${\mathrm{SrTiO}}_{3}$ has been investigated with a variety of ab initio quantum mechanical approaches. In particular we compared pure density functional theory (DFT) approaches with the Hartree-Fock method, and with hybrid methods where the exchange term is tr…