Materials Literature
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Reduction of AgNO 3 by sodium borohydride in the presence of quaternary ammnoium disulfide gave a stable aqueous dispersion of silver nanoballs. The obtained Ag nanoballs showed a strong plasmon absorption peak, indicating that they consisted of metal Ag, although the counteranion of the stabilizer was Br - . They are…
We demonstrate that it is possible to predict the semiconductor material properties, like lattice constant and band gap energy, from their chemical stoichiometries and fundamental element properties of the constituents. We use a correlation technique to show that band gap energy is strongly correlated to electronegati…
The point-by-point mapping of the surface-enhanced resonance Raman scattering (SERRS) and surface-enhanced Raman scattering (SERS) spectra obtained from Langmuir−Blodgett (LB) monolayers of bis( n -butylimido)perylene (BuPTCD) on silver island films are reported. Wide field global images of the SERRS signal are also d…
Cure characteristics and mechanical properties of natural rubber/reclaimed rubber blends were studied. The minimum torque values of the blends were lower than that of the gum compound. The (maximum–minimum torque) and scorch time decreased with increasing reclaim content. The cure rate of the blends were lower than th…
Thermal properties of natural rubber (NR)/styrene butadiene rubber (SBR) latex blends made from latex blending have been investigated using thermogravimetric analysis. It was found that the initial degradation temperature of NR is lower than SBR, and on addition of SBR, the degradation temperature is increased, indica…
On the basis of the structure refinements of neutron powder diffraction data, the Raman bands of A 2 La 2 Ti 3 O 10 (A = Na, K, and Rb) were successfully assigned. The existence of a linear A−O−Ti linkage along the c axis in this structure resulted in the strong dependence of their Raman bands on the nature of the A a…
The effect of time–temperature treatment on the mechanical properties and morphology of polyethylene–polypropylene (PE–PP) blends was studied to establish a relationship among the thermal treatment, morphology, and mechanical properties. The experimental techniques used were polarized optical microscopy with hot-stage…
A simple method to create large areas of in-plane oriented molecular mono- and multilayers is presented. The method is based on layer-by-layer adsorption of polyions and a lyotropic chromonic (nonamphiphilic) liquid crystal, which allows one to orient the molecules uniformly in the plane of deposition. The long-range…
This work is devoted to the study of atomic oxygen recombination on a glass surface, mainly in connection with atomic sources development. In this paper we present a non-stationary model for atomic oxygen recombination on a fused silica surface. Kinetics equations for oxygen atoms, taking into account heterogeneous re…
The use of sponge gourd (Luffa cylindrica) as reinforcement in resin matrix composite materials is evaluated. The morphology of the fibrous vascular system of Luffa's fruit is presented and the advantages of using this natural mat material are highlighted. The use of untreated Luffa does not increase the mechanical pr…
X-ray crystallography of a mandelate complex of a D 2 -symmetric saddle-shaped porphyrin such as 2,3,7,8,12,13,17,18-octamethyl-5,15-bis(2‘,6‘-dimethoxyphenyl)-10,20-diphenylporphyrin ( 2 ) showed that two mandelate anions are hydrogen bonded to the pyrrole NH moieties in a monodentate fashion, where the absolute stru…
Poly(epsilon-caprolactone) (PCL) is known to biodegrade under composting or water sewage plant conditions. However, as compared with poly(alpha-hydroxy acids) derived from lactic and glycolic acids, PCL is much more resistant to chemical hydrolysis and is achiral, a feature that limits very much the possibility of pro…
Organically modified magadiite has been prepared by grafting γ-methacryloxypropylsilyl (γ-MPS) groups to the interlayer surface. γ-Methacryloxypropyltrimethoxysilane as silylating reagent was reacted with dodecyltrimethylammonium-exchanged magadiite. Formation of the organic derivatives of magadiite was confirmed by X…
Coir fiber native to the Brazilian northeast coast has been characterized by mechanical, thermal, and microscopy techniques. The tensile strength, initial modulus, and elongation at break were evaluated for untreated and alkaline-treated fibers. The results showed an enhancement of mechanical properties after 48-h soa…
This work describes the detailed structural investigation of mesophase-templated mesoporous silica films by 1D and 2D X-ray scattering techniques and transmission electron microscopy. The films are prepared by sol−gel dip coating with 2D hexagonal templating mesophases, yielding 2D mesoporous structures consisting of…
The present review outlines, on the basis of specific examples taken from our laboratory, the most important steps in (i) preparing supported nanoassembled model catalysts and (ii) investigating their size-dependent catalytic properties. We describe the cluster generation and present evidence for softlanding of the cl…
The blending of thermoplastic starch (TPS) with other biodegradable polyesters such as polyesteramide could be an interesting way to produce new biodegradable starch-based materials. Different mixes of wheat starch and polyesteramide (BAK) were melt blended by extrusion. After pelletization, granules were injection mo…
Starting from the basic Landau model for the incommensurate-commensurate materials of the class II, we derive the spectrum of collective modes for all (meta)stable states from the corresponding phase diagram. It is shown that all incommensurate states posses Goldstone modes with acoustic dispersions. The representatio…
The effect of fiber surface pretreatment on the interfacial strength and mechanical properties of wood fiber/polypropylene (WF/PP) composites are investigated. The results demonstrate that fiber surface conditions significantly influence the fiber–matrix interfacial bond, which, in turn, determines the mechanical prop…
The real-time real-space higher-order finite-difference method is applied to the calculation of dielectric functions of diamond crystallites. The calculation is performed for cubic grains of various sizes, the largest of which is of 4-nm linear dimension and contains 13 460 carbon atoms. The surface dangling bonds are…