Materials Literature
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The 2-D electron system (2DES) in Si metal-oxide field-effect transistors (MOSFETS) consists of two distinct electron fluids interacting with each other. We calculate the total energy as a function of the density $n$, and the spin polarization $ζ$ in the strongly-correlated low-density regime, using a classical mappin…
Density-functional calculations are used to clarify the role of an ultrathin LiF layer on Al electrodes used in molecular electronics. The LiF layer creates a sharp density of states (DOS), as in a scanning-tunneling microscope (STM) tip. The sharp DOS, coupled with the DOS of the molecule leads to negative differenti…
The stress-strain relations and the yield behavior of model glass (a 80:20 binary Lennard-Jones mixture) is studied by means of MD simulations. First, a thorough analysis of the static yield stress is presented via simulations under imposed stress. Furthermore, using steady shear simulations, the effect of physical ag…
Over the last two decades, scanning tunnelling microscopy (STM) has become one of the most important ways to investigate the structure of crystal surfaces. STM has helped achieve remarkable successes in surface science such as finding the atomic structure of Si(111) and Si(001). For high-index Si surfaces the informat…
We describe a new effect in semiconductor spintronics that leads to dissipationless spin-currents in paramagnetic spin-orbit coupled systems. We argue that in a high mobility two-dimensional electron system with substantial Rashba spin-orbit coupling, a spin-current that flows perpendicular to the charge current is in…
Benzocyclobutene polymerization chemistry is unique and attractive in microelectronics because the thermally activated BCB ring-opening reaction does not produce any volatiles such as water, and products from BCB reactions are nonpolar hydrocarbon moieties. The excellent film-forming properties of divinyltetramethylsi…
Carbon-supported platinum and iridium catalysts were prepared for catalytic wet air oxidation (CWAO) applications. These catalysts were tested in the CWAO of butyric acid aqueous solutions at 200 °C and 6.9 bar of oxygen partial pressure, and significant conversions above 70% were obtained depending on the catalyst us…
Under UV irradiation, poly(vinyl cinnamate) (PVCi) films undergo cross-linking due to [2 + 2] photocycloaddition between cinnamoyl groups. Consequently, electronic configuration of lateral polymer groups changes and also leads to the drop of the refractive index in the visible range. This mechanism is studied with reg…
Mechanical properties of melt-spun and postdrawn isotactic polypropylene (iPP) are studied to examine the dependence on the temperature in the postdrawing stage. In accordance with the literature, the Young's modulus is uniquely determined by the applied draw ratio. However, in contrast to the literature, we found tha…
The synthesis of new donor-acceptor acetylene-bridged compounds was realized via organophosphorus reactions and Sonogashira couplings. These systems exhibit high fluorescence quantum yields, and excitation induces very efficient charge redistribution in the molecules. [structure: see text]
Vinyl polymers incorporating a crowned spirobenzopyran moiety at the side chain were synthesized, and their alkali metal-ion complexation, photochromism, and photoresponsive ion-conducting behaviors were studied in comparison with similar polymers incorporating crown ether and spirobenzopyran moieties independently. T…
Chain mobility in a near surface region at a polystyrene/vacuum interface was investigated by embedding of noble metal nanosized clusters. The embedding process was monitored in situ by X-ray photoelectron spectroscopy. The embedding of nanosized clusters needs long-range chain mobility of the polymer . Therefore, the…
Two-photon polarization fluorescence microscopy is used to study the nature of the emission and nonlinear absorption dipole of single CdSe/ZnS quantum rods. Rods showed strongly polarized nonlinear excitation with sharp angular dependence, following a cos 4 (φ) functional form, in agreement with the predicted two-phot…
Multinuclear ( 13 C, 29 Si, 27 Al, 1 H) solid-state NMR spectroscopy and EPR and FT IR experiments are employed to investigate the thermolysis of aluminum-modified poly(hydridovinylsilazane), [Al(C 2 H 4 −SiHNH) 3 ] n, from which Si−Al−C−N ceramics can be formed. In addition, a comparative study is provided for differ…
This paper describes the synthesis and curing of cross-linkable polynaphthols from renewable resources. Naphthol monomers bearing an unsaturated group from renewable triglyceride oils were designed and oxidatively polymerized to produce new cross-linkable precursor polymers. The monomers were prepared by acylation of…
The interaction of SO 2 with ceria−zirconia model catalysts was studied using high-resolution synchrotron-based X-ray photoelectron spectroscopy (XPS). Epitaxial Ce 1 - x Zr x O 2 (111) ( x = 0.1 and 0.3) thin films (500−700 Å in thickness) were grown by oxygen-plasma-assisted molecular beam epitaxy on single-crystal…
Emulsifying action of high-frequency acoustic waves was investigated on surfactant-free oleic acid/water mixtures using megasonic irradiation (200 kHz and 1 MHz) in baths manufactured for precision cleaning. While the droplet size distribution was bimodal for single irradiation at 40 kHz or 1 MHz, a unimodal distribut…
A new molecule has been designed, synthesized, and utilized as molecular memory for optical storage capable of write, erase, and readout without simultaneously effacing the stored informtion. This molecule is composed of a photochromic fulgimide and a fluorescent dye bonded, chemically, together to form a single molec…
We performed mechanical tests on a matrix-free keratin model-hagfish slime threads-to test the hypothesis that intermediate filaments (IFs) in hydrated hard alpha-keratins are maintained in a partly dehydrated state. This hypothesis predicts that dry IFs should possess mechanical properties similar to the properties o…
This paper is devoted to investigating the physically interesting optical and electromagnetic properties, phenomena and effects of wave propagation in the negative refractive index materials, which is often referred to as the {\it left-handed media} in the literature. This paper covers a wide range of subjects and rel…