Materials Literature
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Synthesis of branched gold nanocrystals by a seeding growth approach is described. In this process, HAuCl4 aqueous solution was supplied stepwise to grow the gold seeds (approximately 2.5 nm) into larger nanoparticles with a highly faceted particle structure (approximately 15-20 nm in diameter). Sodium dodecyl sulfate…
The thermal decomposition of hydrogen peroxide, H(2)O(2), was determined in aqueous suspensions of SiO(2), Al(2)O(3), TiO(2), CeO(2), and ZrO(2) nanometer-sized particles. First-order kinetics were observed for the decomposition in all cases. Temperature dependence studies found that the activation energy was 42 +/- 5…
This article discusses the feasibility of using dendrimer enhanced ultrafiltration (DEUF)to recover Cu(II) from aqueous solutions. Building upon the results of fundamental investigations of Cu(II) binding to PAMAM dendrimers with ethylenediamine (EDA) core and terminal NH2 groups, we combine (i) dead-end ultrafiltrati…
Nanoenergetic ingredients from nano-metal particles and carbon nanotube energetic material encapsulators to nanoparticles of explosives and oxidizers are being investigated for incorporation in novel formulations for weaponization applications. Advanced characterization technologies such as LIBS (Laser Induced Breakdo…
Two- and three-magnon excitations are observed both in the midinfrared absorption and Raman scattering spectrum of $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$ crystals. The polarization and temperature dependence of these signals are well understood by group-theoretical analysis, and th…
Porous silicon carbide fabricated from p-type 4H and 6H SiC wafers by electrochemical etching in hydrofluoric electrolyte is studied. An investigation of the dependence on wafer polarity reveals that pore formation is favored on the C face while complete dissolution occurs on the Si face. When the etching is done on t…
Abstract Anionic polymerization and high‐vacuum techniques were used to prepare a series of well‐defined polyisoprene, polybutadiene, and polystyrene polymacromonomers. The procedure involved (1) the synthesis of styrenic macromonomers in benzene by the selective reaction of the corresponding macroanion with the chlor…
Linear and nonlinear dielectric measurements of liquid crystalline chiral isopentylcyanobiphenyl (5*CB) and n -pentylcyanobiphenyl (5CB), combined with viscosity eta (T) data, are presented. The 5*CB compound glassifies on cooling in the cholesteric phase whereas 5CB crystallizes in the nematic phase. In both compound…
Both in situ and ex situ methods for quantifying area fraction coverage of protein on a surface using atomic force microscopy were developed. The in situ method used a continuous fluid flow system to observe the kinetics of adsorption in real time. The ex situ method required immersing the sample in solution, drying t…
The use of conventional emulsions for tack coats can cause problems as they frequently stick to the tyres of construction vehicles. Consequently, the bond between the asphalt layers is inadequate. Recently, new types of emulsions have been developed from very low-penetration bitumen that contain no flux. They are know…
Abstract A series of 1,1′‐ferrocene‐containing polyelectrolytes ( 3, 4 ) were prepared when 1,1′‐bis( N,N ‐dimethylaminomethyl)ferrocene ( 1a ) or 1, 1′‐bis{[1‐(2‐methyl)imidazol‐1‐yl]methyl}ferrocene ( 1b ) was quaternized with 1,4‐dibromobutane or α, α′‐dibromo‐ p ‐xylene. The counterion was bromide or bis(trifluoro…
Planar periodic arrays of metallic elements printed on grounded dielectric substrates are presented to exhibit left-handed properties for surface wave propagation. The proposed structures dispense with the need for grounding vias and ease the implementation of uniplanar left-handed metamaterials at higher frequencies.…
(GaMn)N is a topic of much current controversy. Rao and Jena suggested [Phys. Rev. Lett. 89, 185504 (2002)] that a high Curie temperature detected in some of the (GaMn)N samples is a result of the formation of small Mn clusters carrying giant magnetic moments. We report a detailed density-functional-theory study of th…
Fabrication of surface relief gratings (SRGs) on azo dye thin films has been investigated utilizing an interference of evanescent waves. SRGs of approximately 210 nm were inscribed on the photoisomerized azo dye films, that were smaller than a half wavelength of an incidence laser of 488.0 nm. The films were set on a…
We consider propagation of electromagnetic waves in a circular fibre with a \ncore of negative-refractive-index metamaterial. We study the fast and slow \nguided modes of a dispersive fibre and the mode properties depending on the \nfibre parameters. We show the peculiar mode properties of a fibre with
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Atomic substitutions in the SrTiO3 (ST) perovskite lattice are foreseen to modify the lattice vibration modes, which are apparently sensitive to the site at which the substitution occurs. In order to understand the effect of Mg substitution in the ST lattice, the dielectric properties of Sr1−xMgxTiO3 and SrTi1−yMgyO3−…
We predict that left-handed metamaterials with nonlinear response can support both TE- and TM-polarized self-trapped localized beams, or spatial electromagnetic solitons. Such solitons appear as single- and multi-hump beams, being either symmetric or antisymmetric, and they are modified dramatically by the hysteresis-…
A series of nickel-, copper-, and aluminum-containing catalysts at a (Ni+Cu)/Al mole ratio of 3 and Cu/Ni mole ratio in the range of 0.03−0.4 was prepared by coprecipitation from corresponding metal nitrate solutions at alkaline pH. The composition and structure of the precipitates were determined by chemical analysis…
The morphotropic composition of lead zirconate titanate (PZT), ${\mathrm{PbZr}}_{0.52}{\mathrm{Ti}}_{0.48}{\mathrm{O}}_{3}$, was studied as a function of temperature $(47--310\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ and hydrostatic pressure (from $0.1\phantom{\rule{0.3em}{0ex}}\mathrm{MPa}$ to $7.6\phantom{\rule{0.3em}…
This paper presents the research on the stability analysis of carbon nanotubes (CNTs) via elastic continuum beam and shell models. The estimation of the flexural stiffness of a single-walled nanotube (SWNT) via the elastic beam model is proposed based on the postulate analyzed and provided in the paper. The validation…