Materials Literature
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Nine organotin fluorocarboxylates RnSnO2CRf (n = 3, R = Bu, Rf = CF3, C2F5, C3F7, C7F15; R = Et, Rf = CF3, C2F5; R = Me, Rf = C2F5; n = 2, R = Me, Rf = CF3) have been synthesized; key examples have been used to deposit fluorine-doped SnO2 thin films by atmospheric pressure chemical vapour deposition. Et3SnO2CC2F5, in…
rently investigated for making controlled drug delivery devices. In spite of the large number of investigations dealing with LA/GA polymers which have been reported in the literature, only little is known about the degradation mechanism of these polyesters in solid state. In this study poly(L,D-lactide-co-glycolide) 5…
A novel organic tubular structure with the walls consisting of aromatic rings was constructed by the self-assembly of a two-dimensional sheet-like molecule in the solid state.
Several synthetic techniques for metal-free phthalocyanines (Pc) and d- and f-metal phthalocyaninates (“PcM”) starting from different precursors (phthalonitrile, urea and phthalic anhydride, phthalimide, phthalic acid, etc.) are reviewed. Conventional methods are presented, as well as some less well-known techniques s…
n-Type GaP was anodized in bromide-ion-containing solutions. In these solutions pores can be grown into the GaP substrate with morphologies that depend strongly on the electrochemical parameters. Under specific potentiostatic conditions highly defined rectangular pores can grow perpendicular to the (100) surface formi…
Consolidated nanocomposite foams containing a large quantity of carbon nanotubes (CNTs) within millimetre-sized pores are prepared for the first time. A commercial ceramic foam is impregnated by a 60 g L−1 slurry of a (Mg(1−x)(Co0.75Mo0.25)xO solid solution (x = 0.01, 0.05, 0.1 and 0.2) powder in ethanol. Three succes…
The effect of part per billion (ppb) levels of on the atmospheric corrosion on Al (99.999%) was investigated in the laboratory at 22°C. Exposure time was 20 and 672 h. The effect of concentration (46-1300 ppb), relative humidity (70-99% RH), and the amount of NaCl applied prior to exposure was studied. In addition, th…
Combining both nano-replication and nano-imprinting techniques using dual silica templates provides a simple way to synthesize ordered mesoporous carbons with bimodal pore size distributions ( approximately 1.5 nm and approximately 3.5 nm).
Semiconductor quantum dots are finding numerous applications in biological systems; in this paper, we report the simple in situ preparation of nucleotide capped cadmium sulfide (CdS) nanoparticles and investigate the interaction of the capping agent with the nanoparticle surface.
The photochemistry of the dinucleoside monophosphate thymidylyl-(3'-5')-5-methyl-2'-deoxycytidine (Tpm5dC) has been studied in aqueous solution using both 254 nm and UV-B radiation. A variety of dinucleotide photoproducts containing 5-methylcytosine (m5C) have been isolated and characterized. These include two cyclobu…
Growth of Escherichia coli K-12 in a modified Davis minimal medium was inhibited under high osmolarity, but it recovered remarkably with the addition of 1 mM proline. The co-existence of K+ with proline enhanced the recovery of growth under high osmolarity more than that in the presence of proline alone. The same was…
Catalytic oxidation of N,N'-dimethylthiourea and thiourea by dioxygen in water using a new cobalt(II) complex of octasulfophenyltetrapyrazinoporphyrazine was performed under mild conditions. The reaction is shown to include the formation of an intermediate anionic five-coordinate complex followed by an unusual two-ele…
The treatment of stainless steel surfaces with responsive polymers was investigated using X-ray photoelectron spectroscopy and scanning electron microscopy. Poly(N-isopropylacrylamide) (PNIPAAM) is a temperature-sensitive polymer which is soluble in water below 32°C (Lower Critical Solubility Temperature (LCST)) but c…
We have demonstrated the direct formation of prolate Ag nanoparticles with a quasi parallel major axis on a template layer of SiO 2 having a strongly anisotropic surface morphology. The peculiar nanomorphology of the nanoparticles and template is physically self-organized owing to self-shadowing during oblique vacuum…
Chains of crystalline-Si nanospheres (Si nanochains), in which Si nanocrystallites are connected by amorphous Si oxide periodically in nearly equal spacing forming a chain-like one-dimensional structure, have been fabricated via a self-organized formation process. In this paper, we review our recent studies and extend…
The adherence and activation of primary human monocytes was investigated on a polyelectrolyte multilayer film containing hyaluronic acid (HA) and poly-L-lysine (PLL). The sequential layer-by-layer deposition of the multilayer film was characterized by surface plasmon resonance. Eight alternating bilayers displayed an…
Induced by systematic variation of the initial polymer concentration in toluene, various morphologies of aggregates including vesicles, spheres, onion-like structures, and worm-like fibers from a rod-coil-rod triblock copolymer, oligo(p-phenyleneethynylene)-polystyrene-oligo(p-phenyleneethynylene), were observed by tr…
High aspect ratio diamond nanocone arrays are formed on freestanding diamond film by means of focused ion beam (FIB) milling technology and hot-filament chemical vapor deposition (HFCVD) method. The structure and phase purity of an individual diamond nanocone are characterized by scanning electron microscopy (SEM) and…
Time-resolved spectra of the luminescence in oxygen-deficient α-Al2O3 crystals were studied using synchrotron radiation. The UV luminescence with hν = 3.26 eV and τ = 1.6 ns was detected in addition to the known slowly relaxing component (hν = 3 eV, τ = 34 ms) of the emission transition of the F-center under excitatio…
Nanostructured hydrous ruthenium-tin oxides [denoted as ( Ru Sn ) O x ⋅ n H 2 O ] with variable Sn contents were fabricated by a modified sol-gel process. The mean particle size of pristine ( Ru Sn ) O x ⋅ n H 2 O , smaller than 3 nm, was monotonously decreased with increasing the mole fraction of Sn in precursor…