Materials Literature
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Due to its high stacking fault energy, no deformation twin has ever been observed in coarse-grained Al. Recent molecular dynamic (MD) simulations predicted the formation of deformation twins in nanocrystalline (nc) Al. Here, we report transmission-electron-microscopic observations of two types of twins in nc Al proces…
Density-functional calculations for the (0001)-Zn surface of wurtzite ZnO are reported. Different stabilization mechanisms, such as metallization of the surface layer, adsorption of OH groups or O adatoms, the formation of Zn vacancies, and large scale triangular reconstructions are considered. The calculations indica…
An approach is presented for the atomistic study of phonon transport in real dielectric nanowires via Green's functions. The formalism is applied to investigate the phonon flow through nanowires coated by an amorphous material. Examples for a simple model system and for real Si nanowires coated by silica are given. Ne…
Remarkable surface wettability transition occurs with an inducement of ultraviolet (UV) for aligned ZnO nanorod films. The inorganic oxide films, which show super-hydrophobicity (left), become super-hydrophilic (right) when exposed to UV illumination. After the films are placed in the dark, the wettability evolves bac…
The dielectric dispersion of the solid solutions (Pb 1- x Ba x )(Zn 1/3 Nb 2/3 )O 3 and (Pb 1- x Sr x )(Zn 1/3 Nb 2/3 )O 3 with x =0.2 and 0.3 has been studied as a function of temperature for the frequency range 0.1 to 200 kHz. The variation in the relaxor nature between the studied compounds is discussed using the g…
Abstract Syndiotactic polystyrene (sPS) has various crystalline forms such as α, β, γ, and δ forms, and a mesophase depending on the preparation method. In this study, we focused on the mesophase with the molecular cavity of sPS, which is obtained by step‐wise extraction of the guest molecules from the sPS δ form. To…
Abstract Thermogravimetric analysis was used for a comparative investigation of the thermooxidative decomposition of ethylene vinyl acetate (EVA) copolymers with different vinyl acetate (VA) group contents. There were two stages of mass loss in this process. It was revealed that the apparent activation energies were c…
La modified Sr 0.8 Bi 2.2 Ta 2 O 9 (SLBT) thin films were fabricated on Pt/Ti/SiO 2 /Si substrates by metalorganic decomposition. All the films were annealed at 800°C using a rapid thermal annealing furnace. X-ray diffraction analysis indicated that single-phase layered perovskite SLBT ferroelectric thin films can be…
Abstract To suppress the repulsive interfacial energy between hydrophilic clay and a hydrophobic polymer matrix for polymer–clay nanocomposites, a third component of amphiphilic nature such as poly(ϵ‐caprolactone) (PCL) was introduced into the styrene–acrylonitrile copolymers (SAN)/Na‐montmorillonite system. Once ϵ‐ca…
The characteristics of Phenanthrenquinone (PQ) doped Polymethyl methacrylate (PMMA) for recording edge-illuminated holographic spectral filters for dense wavelength division multiplexing applications are evaluated. Filter design includes the effects of material absorption and apodization of the index profile. Rigorous…
Two new C-21 steroidal glycoside epimers, paniculatumosides A and B (1 and 2), based on a 13,14:14,15-disecopregnane-type skeleton, with neocynapanogenin B (3) and neocynapanogenin C (4) as two new aglycons, were isolated from the roots of Cynanchum paniculatum. Their structures were determined by spectral data interp…
Abstract Cellulose hollow fiber membranes (CHFM) were prepared using a spinning solution containing N‐methylmorpholine‐N‐oxide as solvent and water as a nonsolvent additive. Water was also used as both the internal and external coagulant. It was demonstrated that the phase separation mechanism of this system was delay…
The effects of Mn doping on the ferroelectric properties of Pb(Zr 0.3 Ti 0.7 )O 3 (PZT) thin films on Pt/Ti/SiO 2 /Si substrates have been investigated. The composition of the PZT and Mn doping level are Pb(Zr 0.3 Ti 0.7 ) 1− x Mn x O 3 ( x = 0,0.2,0.5,1,2,4 mol%). The PZT thin films doped with a small amount of Mn 2+…
The reaction of equimolar NO with the 16 electron molecule RuHCl(CO)L(2) (L = P(i)Pr(3)) proceeds, via a radical adduct RuHCl(CO)(NO) L(2), onward to form RuCl(NO)(CO)L(2) (X-ray structure determination) and RuHCl(HNO)(CO)L(2), in a 1:1 mole ratio. The HNO ligand, bound by N and trans to hydride, is rapidly degraded b…
Energy migration between tryptophan residues has been experimentally demonstrated in self-assembled peptide tapes. Each peptide contains 11 amino acids with a Trp at position 6. The peptide self-assembly is pH-sensitive and forms amphiphilic tapes, which further stack in ribbons (double tapes) and fibrils in water dep…
Abstract Polycaproamide (PCA) and cationic dyeable poly(ethylene terephthalate) (CDP) polymers were blended mechanically (in ratios of 75/25, 50/50, and 25/75) in a melt twin‐screw extruder to prepare three PCA/CDP polyblended materials. The blends of PCA and CDP were spun into fibers. The molar ratio of dimethyl 5‐su…
Abstract A typical resorcinol/formaldehyde/latex (RFL) adhesive and two modified versions were used to bond a tire body stock (NR/SBR/BR blend) to polyethylene terephthalate (PET) cord. Modifications contained a commercial chlorophenol/resorcinol condensate or a lab‐prepared chlororesorcinol/resorcinol condensate (CRA…
Abstract Infrared (IR) spectroscopy studies were performed for poly(methyl methacrylate) (PMMA) samples doped with an organic ligand or its cobalt(II) complex after the extraction of the dopant during γ‐radiolysis. There were no drastic changes in the IR absorption band position, but noticeable changes in the intensit…
Copolymers composed of 5-acryloyloxypentyl cholesterate (Ch5A) and acrylic acid (AA), poly(Ch5A- co -AA)s, were prepared changing their molar ratio, and their mesomorphic behaviors were investigated. Wide- and small-angle X-ray diffraction studies showed that poly(Ch5A- co -AA)s with a Ch5A mole fraction, F, of 0.20 a…
The photoluminescence of YAl 3 (BO 3 ) 4 :Eu 3+ phosphor is sensitized by the codoping of Gd 3+ ions under ultraviolet excitation from 130 nm to 160 nm. The Gd 3+ ions sensitize the emission of Eu 3+ ions by a two-step energy transfer from the host to Gd 3+ and then to Eu 3+ ions.