Materials Literature
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Electrochemical etching of semiconductors, beside technical applications, provides an interesting experimental setup for self-organized structure formation capable of regular, diameter-modulated, and branching pores. The underlying dynamical processes governing current transfer and structure formation are described by…
Rietveld refinements using synchrotron powder X-ray diffraction data were used to study the crystal structure and dehydration behavior of sepiolite from Durango, Mexico. The room-temperature (RT) sepiolite structure in air compares well with previous models but reveals an additional zeolitic H 2 O site. The RT structu…
We demonstrate a room temperature spin dynamo where the precession of electron spins in ferromagnets driven by microwaves manifests itself in a collective way by generating d.c. currents. The current/power ratio is at least three orders of magnitude larger than that found previously for spin-driven currents in semicon…
The longest relaxation time and sharpest frequency content in ferromagnetic precession is determined by the intrinsic (Gilbert) relaxation rate \emph{$G$}. For many years, pure iron (Fe) has had the lowest known value of $G=\textrm{57 Mhz}$ for all pure ferromagnetic metals or binary alloys. We show that an epitaxial…
In the present study, we have electrospun various grades of chitosan and cross-linked them using a novel method involving glutaraldehyde (GA) vapor, utilizing a Schiff base imine functionality. Chemical, structural, and mechanical analyses have been conducted by Fourier transform infrared spectroscopy (FTIR), scanning…
Hexagonal phase nanoparticles of NaYF4:Yb,Er and NaYF4:Yb,Tm (∼8.5 ± 0.8 nm) were synthesized. Significant enhancements of upconversion fluorescence were observed after coating with an undoped NaYF4 shell (core/shell ∼ 11.1 ± 1.5 nm). The hydrophobic core/shell nanoparticles were rendered hydrophilic by a subsequent a…
This study was performed to investigate the effects of silk protein enzyme hydrolysates on blood glucose and serum lipid in db/db diabetic mice. Twelve week-old-male C57BL/KsJ db/db mice were divided into two groups: diabetic control group and 0.25% silk protein hydrolysates solution group, which were fed for 8 weeks.…
Problems in nanomechanics often need to combine mechanical approaches together with methods of physics and chemistry that are outside of the traditional mechanics scope. Recent experimental studies of dry sliding between two hydrogenated DLC (diamond-like carbon) coated counterparts in low oxygen environment showed th…
In order to investigate the nature of the insulator phase of $\ensuremath{\kappa}\text{\ensuremath{-}}{(\mathrm{BEDT}\text{\ensuremath{-}}\mathrm{TTF})}_{2}{\mathrm{Cu}}_{2}{(\mathrm{C}\mathrm{N})}_{3}$ [where BEDT-TTF represents bis(ethylenedithio)terathiofulvalene] and why this salt is a superconductor under pressur…
We have applied three complementary neutron techniques (neutron diffraction, neutron depolarization, and small-angle neutron scattering) to investigate the crossover from long-range to short-range magnetic ordering in ${({\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Tb}}_{x})}_{0.55}{\mathrm{Sr}}_{0.45}\mathrm{Mn}{\mathrm{…
In order to understand how the performance of a liquid-crystal laser depends on the physical properties of the low molar mass nematic host, we have studied the energy threshold and slope efficiency of ten optically pumped liquid-crystal lasers based on different hosts. Specifically, this leads to a variation in the bi…
This contribution, to the potential development of data systems having some degree of “expert” character for use in x-ray photoelectron spectroscopy (XPS), illustrates the manner in which models of “Rules” might be developed by the user community. The field of corrosion science is taken as an example of one community…
Coexistence of charge-ordered (CO) and monoclinic (M) phases has been investigated in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ ($x=0.6$, 0.67, and 0.7). For this purpose, pellets and their corresponding powdered samples have been studied employing low-temperature powder x-ray diff…
The effect of enhanced crater formation has been demonstrated experimentally when multiple and delayed shaped charge jets impact and penetrate concrete. The concept for enhancement utilizes a single follow-on jet at the centerline of holes produced by multiple precursor jets penetrating the surrounding the region. Cal…
Based on an extended Hubbard model and a simplified version of the fluctuation exchange (FLEX) approximation, we explore the charge-density wave (CDW) and superconductivity in the layered transition metal dichalcogenides (TMDs). A quantitative analysis on a simplified model of the $2H\text{\ensuremath{-}}\mathrm{Ta}{\…
A facile method was proposed to directly synthesize the completely coated aluminum borate (Al 18 B 4 O 33 ) nanowire webs with BN by an epitaxial growth process. The BN−Al 18 B 4 O 33 nanocable webs could be obtained by the reaction of Al 18 B 4 O 33 nanowire webs, B 2 O 3, and ammonia at 1200 °C. The high-temperature…
The boron nitride (BN) nanotube has a very wide band gap and can shield the nanowire encapsulated inside its cavity from outside interference. Our calculations indicate that transition metal wires can be inserted inside a variety of zigzag BN nanotubes exothermically. In particular a cobalt wire and the BN tube intera…
Abstract A thermally induced shape memory polymer based on epoxidized natural rubber (ENR) was produced by curing the ENR with 3‐amino‐1,2,4‐triazole as a crosslinker in the presence of bisphenol‐A as a catalyst. Dynamic mechanical and tensile analysis was conducted to examine the variation of glass transition tempera…
A covalently assembled monolayer of 5,10,15-{ p -[9-methoxy-three(oxyethylene)]phenyl}-20-( p -hydroxyphenyl) porphyrin molecules was fabricated on silica substrates already functionalized with a covalent 4-ClCH 2 C 6 H 4 SiCl 3 monolayer. The surface chemical characterization was carried out by angle resolved X-ray p…
Abstract The structural, electric and electronic properties of copolymers derived from mixtures of N ‐methylpyrrole and 3,4‐ethylenedioxythiophene (EDOT) with various concentration ratios have been investigated and, additionally, compared with those of the corresponding homopolymers. The electropolymerization kinetics…