Materials Literature
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The applicability of the Dreiding 2.21 and PCFF force fields to the prediction of properties of cyclo-olefin copolymers was evaluated. The initial performance of the force fields was only modest, and reoptimization of the force field parameters was required. The reoptimization was performed for the Dreiding 2.21 force…
Ag-TCNQ nanostructures are synthesized by using both solution reaction in acetonitrile and a novel vacuum vapor reaction method. Experiments show the latter synthesis method can produce Ag-TCNQ nanowires with high quality. They have diameters around 100 nm and lengths around 5 /spl mu/m. These nanowires could be poten…
We examined the effect of stirring solutions before protein crystallization, which we call pre-stirring. We previously demonstrated that stirring the protein solution continuously promotes the effective growth of protein crystals. The continuous stirring prevents excess spontaneous nucleation and accelerates the growt…
Supercapacitors, also known as ultracapacitors or electric double layer capacitors (ELDC), are electrical energy storage devices, which offer high power density, extremely high cycling capability and mechanical robustness. Due to their electrical performance, supercapacitors have a high potential to be used in industr…
We measured the Raman spectra of Si- and N-doped diamondlike amorphous carbon $(a\ensuremath{-}\mathrm{C}:\mathrm{H})$ films as a function of the excitation wavelength and found that the Raman spectral profiles of these samples varied with the excitation wavelength, depending on the optical band gap. The variation of…
Abstract A series of poly[oxy(4‐ n ‐alkyl‐3,5‐benzoate)oxy‐1,4‐phenylenediacryloyl]s (PPDA‐CnBZ polymers) with high molecular weights was synthesized. These polymers exhibit excellent solubility in some common organic solvents and produce good quality films using conventional spin‐casting and drying processes. The pol…
The habit of organic 4-dimethylamino- N -methyl-4-stilbazolium tosylate (DAST) crystals was successfully controlled by modifying their growth conditions. DAST solutions of different concentrations exhibited different aspect ratios (length/thickness). In addition, we measured the electrooptic (EO) sensitivity of DAST c…
In this work a new methodology to stabilize the perovskite phase in (1 − x )Pb(Zn 1/3 Ta 2/3 )O 3 x PbTiO 3 ((1 − x )PZTa x PT) ( x = 0.00−0.80) ceramics is presented. This approach combines the maximization of the crystalo−chemical and thermodynamics requirements and the optimization of the kinetics of the reaction o…
The high-frequency phonon properties of a computer generated nanocrystalline (nc) fcc Ni with a mean grain size of 5 nm are investigated by directly calculating the on-site phonon Green's function using a recursion technique based on a continued fraction representation. It is found that the high-frequency tail, observ…
The application of power ultrasound to leather processing has a significant role in the concept of "clean technology" for leather production. The effect of power ultrasound in leather dyeing has been compared with dyeing in the absence of ultrasound and conventional drumming. The power ultrasound source used in these…
Abstract Theoretical and practical aspects of using multi‐pulse spin‐locking and the “strong off‐resonant comb” (SORC) sequence for detecting nitrogenated substances by the nuclear quadrupole resonance method were studied. A number of optimum correlations between the parameters of multi‐pulse sequences and the relaxat…
Abstract Time resolved photoluminescence spectra of natural MgAl 2 O 4 spinel doped with Cr 3+ ions have been investigated at room temperature in the wavelength range between 380 and 800 nm. Using several excitation sources from the different lasers we have observed a new band, namely K, with a peak of 15,547 cm −1 (6…
Novel mesoporous organic−inorganic spherical hybrid particles are described that contain a 3-hydroxypropyl organic functionality which is integral to the pore surface. The 3-hydroxypropyl hybrid particle is synthesized in three steps starting from a 4:1 (mol/mol) mixture of tetraethoxysilane and [3-(methacryloxy)propy…
The molecular sieve aluminum phosphate number 5 (AlPO 4 -5) was crystallized through microwave heating of reagents initially confined in water-in-toluene microemulsion droplets. The surfactant cetyltrimethylammonium bromide and cosurfactant butanol were used to form the microemulsion. By adjusting the microemulsion co…
Abstract ZnFe 2 O 4 nanoparticles have been prepared by sol‐gel methods. Mössbauer spectra from 4.2 K to RT showed their magnetic ordering took place at much higher temperature than that of bulk zinc ferrite. Mössbauer measurements that cover the temperature range 4.2 K to room temperature were acquired in zero field…
A series of new thiophene-bridged chromophores based on the powerful heterocyclic acceptor 3-(dicyanomethylene)-2,3-dihydrobenzothiophene-1,1-dioxide has been synthesized; the dependence of the linear and second-order nonlinear optical properties and thermal stability of these species upon the donor group and the brid…
We report the synthesis of carbon nanotubes (CNT) by localized resistive heating of a MEMS structure in a room temperature chamber. This is the first known vapor-deposition CNT growth method that does not require globally elevated temperatures. The localized, selective, and scalable process is compatible with on-chip…
The protein product of the YGR205w gene of Saccharomyces cerevisiae was targeted as part of our yeast structural genomics project. YGR205w codes for a small (290 amino acids) protein with unknown structure and function. The only recognizable sequence feature is the presence of a Walker A motif (P loop) indicating a po…
Carbon Nanotube Field-Effect Transistors (CNFETs) are being extensively studied as possible successors to CMOS. Novel device structures have been fabricated and device simulators have been developed to estimate their performance in a sub-10 nm transistor era. This paper presents a novel circuit-compatible modeling of…
Environmentally responsive, water-soluble polymers have a wide variety of uses ranging from drug delivery to viscosity modifiers. Their utility lies in the ability to use environmental perturbations to dramatically alter the material properties. Here, we describe the interfacial properties of a hydrophobically modifie…