Materials Literature
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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…
The orientational behavior of micron-sized rod-shaped SiC particles in the liquid crystal (LC) solvents E7, N -(4-methoxybenzylidene)-4-butylaniline (MBBA), and 4-octyl-4‘-cyanobiphenyl (8CB) has been studied. Particles were observed to predominately orient either parallel or perpendicular to the nematic director, wit…
ABSTRACT This study focused on the crack‐healing behaviour of three commercial Al 2 O 3 –ceramic‐matrix composites: TiC P /Al 2 O 3 , ZrO 2 /Al 2 O 3 and SiC W /Al 2 O 3 . Vickers indentation was used to introduce surface flaws with different loads of 49, 98 and 196 N. Then the cracked specimens were annealed in air f…
Abstract The primary objective of this study was to improve montmorillonite clay‐platelet separation in vinyl ester resin matrix by organically modifying the nanoclay platelet with a partially reactive onium salt. The reactive onium salt (ω‐undecylenyl amine hydrochloride) was synthesized from commercial ω‐undecylenyl…
Human trichloroacetic acid–soluble protein p14.5 (hp14.5) is a member of the large YjgF/YER057c/UK114 protein family, which comprises approximately 200 members,1 most with unclear biological function. The hp14.5 homologs belonging to the high-identity (>38%) group (approximately 80 proteins) share 9 completely invaria…
Large quantities of high-quality double-walled carbon nanotubes (DWNTs) with very small amounts of amorphous carbon deposits have been produced by catalytic decomposition of n -hexane over Fe−Mo/MgO catalyst. More than 90% of the as-synthesized carbon nanotubes was DWNTs. Raman analysis indicated that the outer tube d…
Electron-spin resonance has been studied in a stoichiometric single crystal of ${\mathrm{LaMnO}}_{3}$ in the temperature range of 4.2 K--250 K. ${\mathrm{LaMnO}}_{3}$ exhibits an extensively studied antiferromagnetic (AF) transition at ${T}_{N}=141\mathrm{K}.$ The spin resonance was detected both in a fixed-frequency…