Materials Literature
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Abstract Residual long‐term decays of photocurrent after stopping the irradiation of UV light have been reported in titanium oxide films. Excited electrons recombine with holes through the various routs. The photocurrent decay exhibits a stretched exponential form. It is shown in the case of argon environment that the…
In this work, a facile route using a simple solvothermal reaction and sequential heat treatment process to prepare 3D La2O3 flower-like nanostructures without employing templates or matrices for self-assembly is presented. The as-synthesized products were characterized by powder X-ray diffraction (XRD), scanning elect…
Abstract Thermal properties and non‐isothermal melt‐crystallization behavior of poly(trimethylene terephthalate) (PTT)/poly(lactic acid) (PLA) blends were investigated using differential scanning calorimetry and thermogravimetric analysis. The blends exhibit single and composition‐dependent glass transition temperatur…
Abstract As distinguished from the conventional preparation of poly(aryl ether ketone)s utilizing 4,4′‐difluorobenzophenone, a novel synthetic method of high molecular weight poly(phthalazinone ether ketone) derived from 4,4′‐dichlorobenzophenone was studied. Reaction conditions to get high molecular weight polymer we…
Abstract Combinations of various biocides with Glutaraldehyde or THPS (tetrakis hydroxymethyl phosphonium sulfate), the two most commonly used injection fluid biocides in the oil and gas industry, showed both improved performance and lower environmental aquatic toxicity profiles. Treatment conditions included temperat…
Abstract Fluorescent amphiphilic polymers were produced by grafting different types and levels of hydrophobic pendant groups with intrinsic fluorescent properties (fluorenylmethoxy carbonyl (Fmoc), dimethylamino‐1‐naphthalenesulfonyl (Dansyl), and naphthalene (Naphth) to a water soluble homopolymer backbone, polyallyl…
We have investigated the nature of the residual damage in diamond crystals following the ion implantation/graphitization “lift-off” process, using near-edge x-ray absorption fine structure spectroscopy and transmission electron microscopy. A defective but crystalline interface is found, which displays dense pre-edge u…
The antiferromagnetic (AFM) state of FeAs is very different from that of the FeAs-based superconductor parent compounds, and it is rather complicated, with the Fe spins forming an incommensurate magnetic spiral pattern with a wavelength of about 15 A. To model this, we perform first-principles calculations and find th…
We report measurements of the bending stiffness in free standing carbon nanotubes, using atomic force microscopy inside a scanning electron microscope. Two regimes with different bending stiffness were observed, indicative of a rippling deformation at high curvatures. The observed critical strains for rippling were in…
We propose a general model, based on Anderson superexchange and the pseudo Jahn-Teller effect, to explain why ferroelectric and octahedral tilting distortions are favored by ferromagnetic ordering when compared to antiferromagnetic tilting distortions in ${\mathit{ABX}}_{3}$ ($A$ $=$ alkali, alkaline-earth ion, $f$-fi…
Abstract Previous work showed that there was a synergistic effect of nucleating agent (NA) and elastomer in improving the fracture resistance of isotactic polypropylene (PP), relating to the formation of large amounts of β‐PP (β‐NA nucleated system) or the decrease of the spherulites diameters of α‐PP (α‐NA nucleated…
The low and the high molecular weight poly(perfluoro‐2‐methylene‐1,3‐dioxolane)s were prepared using perfluorobenzoyl peroxide as a free radical initiator. Both polymers obtained were semicrystalline and insoluble in organic solvents. The glass transition temperatures ( T g ) of polymers obtained were 94–106°C, and th…
New structured graphite-shelled Si nanocrystals were prepared by laser ablation in various solvents including H 2 O, ethanol, 2-propanol, hexane, octane, octadecene, trioctylamine, toluene, trioctylamine/toluene, and oleylamine/toluene. With the aromatic debris, containing hexagonal carbon rings, from organic media se…
A novel type of negative differential resistance (NDR) is demonstrated in composites incorporating graphite nanoparticles in a silicone matrix. The NDR occurs as the electric field breaks the π-band of graphite, initiating a semimetal-to-insulator transition. The current peak is robust and tunable with the graphite co…
Abstract This paper presents own results in the field of organic recording media for bitwise working (WERM) and archival (WORM) optical memory. For the development of recording media for bitwise WERM optical memory thermally irreversible photochromic compounds from diarylethene, fulgimide classes manifesting reversibl…
A novel antifungal nano-silver agent (BT-CF-AgNPs) was synthesized by using bayberry tannin (BT) grafted collagen fiber (CF) as support, and the antifungal behaviors of the nano-silver were investigated by using Saccharomyces cerevisiae as a typical fungus. Bayberry tannin (BT), a kind of natural polyphenol, was graft…
This paper reports on the synthesis and characterization of novel poly(L-lactide)/multi-walled carbon nanotube (PLLA/MWCNT) porous scaffolds prepared by the freeze-extraction method. The obtained scaffolds showed well-distributed and interconnected porous structures with more than 80% porosity and median pore size aro…
Abstract An acrylate processing aid (ACR)‐based ionomer containing lanthanide (La(III)) ion was synthesized and the influences of the ionomer on thermal stability, fusion time, transparency and tensile properties of rigid poly(vinyl chloride) (PVC) were investigated. Results revealed that the ionomer with a suitable L…
Novel heterotelechelic poly( N -vinylpyrrolidone) (CPA-PVP-IBMB) oligoperoxide containing anchoring carboxyl group from 4-cyanopentanoic acid (CPA) and peroxide end-group from 1-isopropyl-3(4)-[1-(tert-butyl peroxy)-1-methylethyl]benzene (IBMB) chain transfer agent was synthesized and investigated as a surface-active…
Hybrid functional calculations predict significantly enhanced stability of AX centers against shallow acceptors in selected II-VI semiconductors (ZnO, ZnS, and ZnSe), as compared to the calculations based on local density approximation and generalized gradient approximation. The results agree well with the experimenta…