Materials Literature
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Optimizations performed with two geometrical, molecular mechanical and density functional models show that the configuration of single-wall carbon nanotubes is slightly twisted with respect to that predicted by conventional techniques. Geometrical models are used to explain the effect by breaking of local symmetry of…
The stability and reactivity of metal nanoclusters are critically dependent on the valence electronic configuration of the cluster. Many “magic” electronic configurations are inaccessible for pure trivalent metal clusters. However, doping is one method by which the electronic configuration and properties of a cluster…
The evolution of deformation structures in individual grains embedded in polycrystalline copper specimens during strain path changes is observed in situ by high-resolution reciprocal space mapping with high-energy synchrotron radiation. A large number of individual subgrains is resolved; their behavior during the stra…
Using atomic layer deposition technique, epitaxial titania polymorph TiO2 II was grown on α-Al2O3(0 0 1) (c-sapphire) substrates. TiCl4 and H2O served as precursors. The growth temperature ranged from 350 to 680 °C. Raman scattering and high-resolution x-ray diffraction and reflection measurements were applied to char…
The anticorrosive performance of zinc phosphate coatings developed by galvanic coupling technique on mild steel substrates using the cathode materials such as titanium (Ti), copper (Cu), brass (BR), nickel (Ni), and stainless steel (SS) is elucidated in this study. Thermal and chemical stability tests, immersion test…
A unique approach to detect chemical speciation and distribution on nanometer-scale nuclear materials has been achieved by the combination of neutron reflectometry and shell-isolated surface-enhanced Raman spectroscopy. Both surface and underlying layers of the uranium oxide materials were determined with angstrom-lev…
In this research, the effect of the drawing process on the physical and thermal properties of commercially available polypropylene fiber containing selective peroxide was studied. Attempts have also been made to compare this drawn fiber sample with conventional polypropylene fibers produced from reactor and with contr…
The engineering of surfaces to control cell adhesion represents an active area of biomaterials research. Herein, we demonstrate that it is possible to tune the adhesion and proliferation of a human osteoblastic cell line (Saos-2) by tailoring the nanopore size of an oxide film coating.
Cu- and Mn-bearing tourmalines from Brazil and Mozambique were characterised chemically (EMPA and LA-ICP-MS) and by X-ray single-crystal structure refinement. All these samples are rich in Al, Li and F (fluor-elbaite) and contain significant amounts of CuO (up to ~1.8 wt%) and MnO (up to ~3.5 wt%). Structurally invest…
The quaternary hydride Mg 2 [FeH 6 ] 0.5 [CoH 5 ] 0.5 is a disordered material with a random distribution of the complex ions. In the present contribution, we use a combination of inelastic neutron scattering (INS) spectroscopy and periodic density functional theory (periodic-DFT) to further characterize this novel ma…
Density and ultrasonic velocity have been measured for sodium nitroprusside in aqueous solutions of CH 3 OH, ethylene glycol, DMSO, and n‐propanol solvents at 308.15 K. A quantitative relationship has been established among the acoustical properties like ultrasonic velocity ( U ), adiabatic compressibility ( β ), inte…
Reaction of 5,10,15,20‐ meso ‐tetra(p‐chlorophenyl)porphyrin[H 2 (p‐Cl)pp] with zinc(II)acetate(Zn(OAc) 2 ) and phenols results in the formation of corresponding axially ligated zinc(II)‐ meso ‐tetra(p‐chlorophenyl)porphyrin (X‐Zn‐t(p‐Cl)PP) (X = phenolates and pyridinates). The four‐coordinated zinc porphyrin accepts…
We explore the Bi(Zn 1/2 Ti 1/2 )O 3 –La(Zn 1/2 Ti 1/2 )O 3 –PbTiO 3 pseudoternary phase diagram using density functional theory and a solid solution model. We find a region of stability against phase segregation that contains a morphotropic phase boundary. On the basis of the results, we identify a ferroelectrically…
Hierarchical Co3O4 mesoporous nanostructures have been synthesized by a hydrothermal method combined with subsequent calcination. These hierarchical nanostructures were characterized by X-ray diffraction, field emission scanning electron microscopy, and transmission electron microscopy. According to varying the reacti…
Nonspherical semiconductor nanocrystals (NCs) may exhibit strongly anisotropic photoluminescence due to the intraband transitions, whose matrix elements depend critically on the envelope wave functions of the confined electrons and holes. We demonstrate that this anisotropy may be used as the basis for a new type of p…
Combining formulation of particle-stabilized water-in-oil-in-water emulsion and in situ sol-gel chemistry, original monodisperse thermo-responsive capsules able to encapsulate at once hydrophilic and hydrophobic drugs are synthesized. Due to the presence of a stiff shell, the release is provoked by increasing the temp…
Berbamine loaded chitosan-agarose microspheres were prepared using a water-in-oil emulsion technique. Optimum preparing parameters were determined by orthogonal experiments as follows: ratio of berbamine to chitosan (w/w) is 1:10; percentage of emulsifier (span 80, v/v) is 6%; volume of glutaraldehyde is 2 mL; and rea…
We explore the effects of increased protein mobility inside the aqueous channels of ordered lyotropic liquid crystals (LLC) of cubic Pn3m symmetry on the process of in meso crystallization of lysozyme proteins. The protein confinement within the channels is released by swelling the aqueous domains by doping the mesoph…
Reactions of M(OAc)2·4H2O (M = Ni, Co) with 3-[benzyl(2-hydroxyethyl)amino]-1-propanol (H2L) in the presence of pyridine or triethylamine afforded novel homometallic icosanuclear wheel-shaped complexes [M20L4(HL)4(OAc)28] (M = Ni (1), Co (2)), which consist of a central M(II)12 single-stranded, nearly planar loop with…
Deep-UV lithography using high-efficiency phase mask has been developed to print 100 nm period grating on sol-gel based thin layer. High efficiency phase mask has been designed to produce a high-contrast interferogram (periodic fringes) under water immersion conditions for 244 nm laser. The demonstration has been appl…