Materials Literature
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Summary The relationship between sodium adsorption ratio (SAR) and exchangeable sodium percentage (ESP) for all soils has traditionally been assumed to be similar to that developed by the United States Salinity Laboratory (USSL) in 1954. However, under certain conditions, this relationship has been shown not to be con…
A poly(L-lactide)-b-poly(Nepsilon-(Z)-L-lysine) (PLLA-b-PZLys) block copolymer was synthesized through the ring-opening polymerization of Nepsilon-(Z)-lysine-N-carboxyanhydride using L-Phe-terminated PLLA as a macroinitiator. The L-Phe-terminated PLLA was prepared through a novel three-step process. First, the hydroxy…
We report on picosecond photoluminescence decay in silicon nanocrystals prepared by ion implantation. We found that the photoluminescence within the first nanosecond after photoexcitation by a $532\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ picosecond pulse differs substantially from that with $266∕355\phantom{\rule{0.3em…
Abstract Continuous polymer nanofibers are available through electrospinning, but most have the same structure in their cross section. This article focuses on the fabrication and the structural and mechanical characterization of pencil‐like double‐layered composite nanofibers coaxially electrospun from solutions of tw…
Ein Wechsel von Sol zu Gel wird durch den Austausch des als Gast eingeschlossenen Anions ausgelöst. Die Sekundärstrukturen von reversibel gebildeten Koordinationspolymeren wandeln sich in wässrigen Medien ineinander um: von einer gefalteten helicalen Konformation (im Gel) in eine nichtgefaltete Zickzack-Konformation (…
As a new member of the polyhydroxyalkanoate (PHA) family, poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) has better mechanical and processible properties than poly (3-hydroxybutyrate) (PHB). Still, it is difficult to introduce functional groups to the polyester carbon chain of PHBHHx, which restricts the modi…
A nearly pure, dense, polycrystalline bulk Ti 3 AlC 2 sample was prepared by reactively hot pressing the element titanium, aluminum, and graphite powders. The tribophysical properties were investigated by sliding a Ti 3 AlC 2 block dryly against a low‐carbon steel disk. It was found that the friction coefficient is as…
The reaction of the ligand N-phenyl-1,2-benzenediamine (N-phenyl-o-phenylenediamine), H2[L(PDI)], in dry acetonitrile with [FeIII(dmf)6](ClO4)3 (dmf = N,N-dimethylformamide) affords the dimer (mu-NH,NH)[FeIII(L(ISQ))(L(PDI))]2 (1), where (L(ISQ))*- represents the pi radical monoanion N-phenyl-o-diiminobenzosemiquinona…
The oxidation behavior of polymer‐derived amorphous SiAlCNs was studied in the temperature range of 900°–1200°C. The results revealed that while at 900°C the oxidation of the SiAlCNs follows typical parabolic kinetics, at higher temperatures the oxidation rates of the materials decrease with annealing time. Long‐term…
Bi Mn O 3 (010) films (100nm) were grown epitaxially on SrTiO3 (001) and 0.2at.% Nb-doped SrTiO3 (001) substrates using pulsed laser deposition. The microstructure, electrical, and magnetic properties, and indeed the formation of the correct phase, were found to be very sensitive to growth parameters. This optimizatio…
Abstract Cure kinetic studies on nitrile rubber(NBR)‐layered clay nanocomposites, prepared by a melt mixing process, was investigated using a cure rheometer and differential scanning calorimeter (DSC). The characterization of the structure of the nanocomposites of uncured and cured samples was performed using X‐ray di…
Nickel ferrite (NiFe 2 O 4 ) nanoparticles were successfully synthesized via a hydrothermal process and characterized by X‐ray diffraction and transmission electron microscope techniques. The effects of reaction temperature, holding time, and RH ratio (isopropyl alcohol/water) were discussed. The NiFe 2 O 4 nanopartic…
The surface structure of organically capped PbS nanocrystals using synchrotron radiation excited core-level photoelectron spectroscopy has been studied. The nanocrystallites prepared by methods of colloidal chemistry have average diameters of 3.1, 3.9, 4.6, and 7.6 nm with narrow size distributions and are stabilized…
Glioblastoma multiforme (GBM) is a highly advanced and invasive brain tumor due to which current treatments cannot completely treat GBM or prevent recurrence. Therefore, adjunctive treatments are required. As part of the invasive and angiogenic nature of GBM, it has been well established that matrix metalloprotease-2…
In this article, we describe a series of new complex salts in which electron-rich transition-metal centers are coordinated to three electron-accepting N-methyl/aryl-2,2':4,4' ':4',4' ''-quaterpyridinium ligands. These complexes contain either Ru(II) or Fe(II) ions and have been characterized by using various technique…
The discovery of the four-step, double autocatalytic mechanism by which transition-metal organometallic and metal-salt precursors self-assemble into zerovalent transition-metal nanoclusters under reductive conditions is reported. The prototype system investigated is (1,5-COD)PtCl 2 reduction under hydrogen plus 2 equi…
By using the spin torque model in ferromagnets, we compare the response of vortex and transverse walls to the electrical current. For a defect-free sample and a small applied current, the steady state wall mobility is independent of the wall structure. In the presence of defects, the minimum current required to overco…
When a spin-polarized current flows through a ferromagnet, the local magnetization receives a spin torque. Two consequences of this spin torque are studied. First, the uniformly magnetized ferromagnet becomes unstable if a sufficiently large current is applied. The characteristics of the instability include spin wave…
We show that a moving Josephson vortex in spatially modulated layered superconductors generates out-of-plane THz radiation. Remarkably, the magnetic and in-plane electric fields radiated are of the same order, which is very unusual for any good-conducting medium. Therefore, the out-of-plane radiation can be emitted to…
Simple photochromic dithienylethylenes with either a perfluoro or a perhydro cyclopentene ring, and a variety of substituents (chlorine, iodine, trimethylsilyl, phenylthio, aldehyde, carboxylic acid, and ethynylanisyl), have been prepared and their electrochemical behavior was explored by cyclic voltammetry. All dithi…