Materials Literature
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Silver nitrate was incorporated in cellulose acetate with different substitution degrees as a dispersion medium. Silver-containing polymer solutions in 2-methoxyethanol were rheologically investigated, both before and after boiling, which permitted a better understanding of the morphological aspects of the correspondi…
We report on the preparation and characterization of multidimensional nano-objects nanoassembly in film surface coatings. 2D reduced graphene oxide (rGO) sheets are assembled with 0D block copolymer micelles (BCM)s through electrostatic layer-by-layer assembly. The BCM/rGO paired nanoassembly surface coatings were for…
We present a theory for surface polaritons on ferroelectric-antiferromagnetic materials with canted spin structure. A small uniform canted moment is allowed, resulting in a weak ferromagnetism directed in the plane parallel to the surface. Surface and bulk polariton modes for a semi-infinite film are calculated for th…
L,L-Lactide, a dimer of L-lactic acid, is the typical monomer used for the catalytic synthesis of poly(L-lactic acid) (PLLA). We studied its phase diagram and reactivity at high pressure and high temperature by means of a diamond anvil cell. FTIR and Raman spectroscopy were employed to probe the changes occurring in t…
Abstract Electron paramagnetic resonance (EPR) is used to identify the next nearest neighbour Co 2+ pairs coupled by spin–spin interaction in Co‐doped ZnO single crystals grown by the hydrothermal technique. These dimer centers are described by a spin Hamiltonian with exchange coupling terms written as interaction bet…
Abstract We report the application nondegenerate ultrafast mid‐infrared spectroscopy to investigate the acoustic phonon cooling process in epitaxial graphene. We show that the power‐dependent experimental results match theoretical predictions of the low temperature acoustic cooling process. The hot phonon effect in ac…
Dilute sulfuric acid hydrolysis was performed before the isolation of cellulose from Eulaliopsis binata. And then, the effects of dilute acid hydrolysis on composition and structure of the cellulose was studied in detail. The results indicated that hemicellulose was dissolved mostly and that the lignin-hemicellulose-c…
By application of flux growth methods in combination with redox reactions, single crystals of BaAg(2)Cu[VO(4)](2) can be synthesized. A new structure type (triclinic, P1, Z = 2, a = 5.448(2) Å, b = 5.632(3) Å, c = 14.393(6) Å, α = 94.038(9)°, β = 90.347(6)°, and γ = 118.195(5)°) has been found and will be described he…
The concentrations of nutrient heavy metals in the roots, stems and leaves of medicinal plants Calotropis procera and Citrullus colocynthis, and in the corresponding sediment samples from Al-Riyadh and Gazan, Saudi Arabia, were investigated to ascertain whether plant species and organs are characterized by differentia…
Abstract Nanocomposite fibers of polypropylene and montmorillonite‐based organoclay were produced by a melt‐spinning process, and their structures and mechanical properties were studied. The addition of nanoclay in polypropylene increased the rate of crystallization and altered the microstructures of the fibers. Incre…
We derive the electromagnetic energy density in a chiral metamaterial consisting of uncoupled single-resonance helical resonators. Both the lossless and absorptive cases are studied, and the energy density is shown to be positively definite. The key relation making the derivation successful is the proportionality betw…
Two new quaternary sulfides, Ba(2)SbFeS(5) and Ba(2)BiFeS(5), were synthesized by using a conventional high-temperature solid-state reaction method in closed silica tubes at 1123 K. The two compounds both crystallize in the orthorhombic space group Pnma with a = 12.128(6) Å, b = 8.852(4) Å, c = 8.917(4) Å, and Z = 4 f…
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Abstract Free‐radical suspension polymerization was used to synthesize thermally expandable microspheres (TEMS) in which a poly(acrylonitrile‐ co ‐methacrylonitrile) shell encapsulates isooctane. TEMS were prepared with 1,4‐butanediol dimethacrylate (BDDMA), in combination with 1,4‐butanediol divinyl ether (BDDVE), di…
Abstract We report on investigations upon a surface‐enhanced Raman scattering (SERS) substrate produced from a two‐dimensional single‐walled carbon nanotube (SWNT) network decorated with Ag nanoparticles. Using the strong and unique Raman spectrum of SWNTs as a reference, the SWNT/Ag nanostructure can be considered to…
Structural modification of castor oil has been done with tris (m-hydroxy phenyl) phosphate (THPP) using the ester exchange process. The resultant compound was a phosphorus-based polyol that was reacted with different diisocyanates like TDI, IPDI, HMDI, and MDI to form a series of flame-retardant polyurethanes. These p…
Possible crystal structures of ethyl-tert-butyl ether (ETBE) were predicted by global lattice-energy minimizations using the force-field approach. 33 structures were found within an energy range of 2 kJmol(-1) above the global minimum. Low-temperature crystallization experiments were carried out at 80-160 K. The cryst…
We report the attenuance and temperature-dependent photoluminescence spectra of PbSe nanowires with diameters between 5.6 and 26.4 nm (12−23% relative standard deviation) and lengths greater than 1 μm. The nanowire first exciton energy varies between 0.3 and 0.6 eV as the diameter decreases from 26.4 to 5.6 nm, respec…
Density functional theory (DFT) and the valence bond configuration interaction (VBCI) model have been applied to the oximato-based Mn(III)(3)O single-molecule magnets (SMMs), allowing one to correlate the Mn(III)-Mn(III) exchange coupling energy (J) with the bridging geometry in terms of two structural angles: the Mn-…
We determine the structure, energetics, and emerging magnetic propertiesof Au n clusters using first-principles plane-wave density functional theory. We compare and contrast the findings obtained with and without spin−orbit interaction in the gold clusters of sizes down to 0.5−1 nm. The shapes are chosen to be represe…