Materials Literature
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The effects of particlesize and heating temperature of magnesium oxide (MgO), calcium oxide (CaO), and zinc oxide (ZnO) powders on the antibacterial activities of their slurries were studied by the conductance method. An increase in particle size of the powders reduced their antibacterial activity. The variation of ac…
The complex trans-[RuVI(tmp)(O)2] 1 (tmp = dianion of 5,10,15,20-tetramesitylporphyrin) catalytically dehydrogenates primary and secondary amines in the presence of air; possible reaction steps involve a disproportionation reaction that generates a RuII intermediate, as evidenced by the isolated bis(benzylamine) compl…
The nitrogen and carbon activities are the cardinal parameters for process control of nitriding, nitrocarburising, carburising, and carbonitriding. The essential elements of the thermodynamic background for the definition of the so called nitrogen and carbon activities in nitrided and carburised surface layers of iron…
Narrowing the size distribution of polydisperse CdS nanocrystals whose average diameter was 42 Å and standard deviation was 19 Å was achieved utilizing size selective photocorrosion with sequential irradiation with monochromatic light whose wavelength was changed step by step from 490 to 430 nm in air-saturated sodium…
Three cyclic initiators were prepared from dibutyltin oxide and 1,2-ethanediol, 2-mercaptoethanol, and 1,2-dimercaptoethane. Mass spectra demonstrated in agreement with literature data that the tin compounds obtained from 1,2-ethanediol and 2-mercaptoethanol form dimeric 10-membered rings. Polymerizations of l -lactid…
By codoping Dy3+ into the SrAl2O4:Eu2+ phosphor, long persistent phosphorescence was observed and its afterglow characteristics were investigated. The excitation wavelength suitable for long persistent phosphorescence was 200-250nm, much shorter than the wavelength of 4f7-4f65d absorption of the Eu2+ ions, suggesting…
Tin(II) tungstophosphate and tungstosilicate derivatives [Sn II 3 (α-PW 9 O 34 ) 2 ] 12- ( 1 ), [Sn II 3 (α-SiW 9 O 34 ) 2 ] 14- ( 2 ), and [Sn II 3 (β-SiW 9 O 34 ) 2 ] 14- ( 3 ) have been prepared by reaction of tin(II) sulfate with Na 8 H[A,β-PW 9 O 34 ]·24H 2 O, Na 10 [α-SiW 9 O 34 ]· x H 2 O, and Na 10 [β-SiW 9 O…
Survey of short fibre-polymer composites Short fibre filled thermoplastics Thermosetting short fibre-reinforced composites Short fibre-thermoplastic elastomer composites Composites of polychloroprene rubber with short fibres of polyethylene terephthalate and nylon Properties and processing of short metal fibre filled…
Chitosan/lactic acid films were cast upon pectin films with either glycerol or lactic acid as plasticizer to give clear laminated films with dynamic mechanical properties similar to those for pectin films alone. To prevent fungal growth, lactic acid was used to replace glycerol in the pectin film without significant c…
The compound [Fe(abpt) 2 (TCNQ) 2 ], where TCNQ is the radical anion 7,7‘,8,8‘-tetracyanoquinodimethane and abpt = 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole, is an Fe(II) complex containing coordinated radical anions which undergoes a thermally induced spin-crossover with T c = 280 K. Variable-temperature magnetic…
The third order nonlinear optical susceptibilities χ(3) of Sb2O3-B2O3 binary glasses have been measured by the third harmonic generation (THG) method. The IR and Raman spectroscopic study reconfirmed that the structure of Sb2O3 glass is similar not to senarmontite but to valentinite which consists of double-chains of…
Commercial purity (CP) titanium is used primarily in applications requiring exceptional corrosion resistance. The CP titanium alloys contain small amounts of oxygen. The mechanical properties of titanium, such as tensile and fatigue strengths, can be enhanced with oxygen additions, but care must be taken not to compro…
This paper reports the first example of the direct intercalation of an organic polymer into the interlamellar spaces of kaolinite. Poly(ethylene glycols) (PEG 3400 and PEG 1000) were intercalated into kaolinite by displacing dimethyl sulfoxide (DMSO) from the DMSO−kaolinite intercalate (Kao−DMSO). This was done direct…
When the oxidative polymerization of aniline proceeds in the presence of poly(vinyl alcohol) or poly( N -vinylpyrrolidone), sterically-stabilized polyaniline dispersions are obtained. The particles have an average diameter of about 300−600 nm as determined by dynamic light scattering. The yield of polyaniline in dispe…
Results from structure refinement using neutron powder diffraction data for boron carbide samples with 10, 13, 16, and 20 at. % carbon are reviewed. Those obtained for ceramic powder samples show an apparent large vacancy concentration (as high as 25%) at the central atom position of the linear three-membered chains.…
We investigate the dispersion of polymer-grafted particles suspended in a polymer matrix by viscoelastic measurements and electron microscopy. We find that, when the graft density is low, the particle dispersion improves with an increase of the graft density, while the particle dispersion becomes worse when the graft…
Thin films of ZnO:Al have been deposited on glass substrates by a pulsed laser deposition technique employing an ArF laser ( λ=193 nm). For all experiments, a repetition rate of 10 Hz, an energy density of 1 J/cm 2 , and an irradiation time of 20–30 min (12000–18000 shots) were assumed. Optical transmittance of around…
X-ray photoelectron spectroscopy (XPS) has been used to investigate the surface characteristics of various novel fluorinated acrylate homopolymers [1,1-dihydroperfluorooctyl acrylate (PFOA), 1,1-dihydroperfluorooctyl methacrylate (PFOMA), 1,1,2,2-tetrahydroperfluorooctyl acrylate (PTAN)] as well as diblock copolymers…
Measurements of the complex impedance of the interface between mild steel and deaerated 1 M HCl solutions without and with the addition of different inhibitors, derivatives of benzimidazole, have been made in the frequency range of (0.1−9.5) × 10 4 Hz. Adequate structure models of the interfaces as well as some data o…
Kinetic studies of the hydrolysis and condensation of tetraethylorthosilicate (TEOS) during the formation of uniform silica particles were performed through determining concentrations of TEOS and silicic acid by means of gas chromatography and a conductometer, respectively. It was shown that both hydrolysis of TEOS an…