Materials Literature
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A novel photochromic molecule having a bis(2,3'-benzothienyl) unit has been synthesized. The derivative underwent a thermally irreversible photochromic reaction upon alternate irradiation with UV and visible light.
The preparation of ethylene propylene diene terpolymer (EPDM)/organoclay nanocomposites was studied by melt blending method. The maleic anhydride modified EPDM oligomer (EPDM-MA) was used as a compatibilizer. The effect of organoclay on structure of nanocomposites was evaluated by X-ray diffraction (XRD). The absence…
Abstract Aufgrund des zunehmenden Einsatzes von Magnesiumlegierungen als Strukturwerkstoff in Leichtbauanwendungen erlangen deren Korrosionseigenschaften erhöhte Beachtung. In dieser Arbeit werden wichtige Parameter, die zur Korrosion der Magnesiumlegierungen führen, untersucht und diskutiert. Es wird gezeigt, dass de…
The X-band perpendicular-mode EPR spectra of manganese(III) porphyrins were detected for the first time.
Segmented-in-series solid oxide fuel cell (SOFC) arrays typically feature cell widths ⩾1 cm. We consider here the advantages and disadvantages of decreasing the cell width to 1–2 mm. The calculation results indicate that electrode resistance losses can be minimized via reduced widths, even for relatively thin electrod…
Phosphorylcholine (PC) groups were grafted onto ammonia plasma-treated biaxially-oriented polypropylene (BOPP) surfaces, via (a) reductive amination of phosphorylcholine glyceraldehyde and (b) a two-step procedure involving the chemical amplification of surface amine groups with tris(2-aminoethyl amine) and subsequent…
We investigate the ionic strength and temperature dependence of metastability with respect to crystallization in lysozyme solution. The supersaturation limit c* shows a simple scaling relation with salt concentration and, together with the equilibrium solubility csat, approximately factorizes into two terms, respectiv…
An attempt has been done to apply silk sericin for finishing there on synthetic fabrics such as poly(ethylene terephthalate) (PET) and polypropylene (PP). N-Vinylformamide was grafted onto the PET fabric swollen by benzyl alcohol and unswollen PP fabrics, using the so-called “film seal method” of electron-beam irradia…
Thermophysical properties of liquid and supercooled nickel were measured using electrostatic levitation. Over the 1420-1850 K temperature range, the density can be expressed as ρ(T )=7.89×103−0.65(T −Tm) (kg · m-3) with melting temperature Tm=1728 K. The isobaric heat capacity was estimated as Cp(T )=36.2+1.9×10-3(T −…
Transient isotopic experiments reveal that the mechanism of N2O formation in the high-temperature NH3 oxidation over Pt-Rh gauze involves the reaction of adsorbed ammonia intermediate species (NHx) and NO.
Polypyrrole(PPy)nanotubes and nanowires were synthesized through electrochemical polymerization method in nanoporous anodisc aluminum oxide(Al2O3)template. The electrolyte consisted of pyrrole monomer, solvent, and ionic liquid dopant such as BMIMBF4(1-butyl-3-methyl imidazolium tetrafluoroborate)or BMIMPF6(1-butyl-3-…
Monazite(LaPO4)-coated alumina-fiber/alumina-matrix composites were fabricated by hot-pressing, and effects of sintering temperature, sintering time, applied load and fiber volume fraction on mechanical properties of composites were examined. Better fiber debonding of coated fiber than that of non-coated fiber in the…
Alkaline-earth substituted lanthanum manganites La1 − xAxMnO3 (A = Ca, Sr; x = 0, 0.4) were synthesized in air by self-propagating high-temperature synthesis (SHS): a combustion process involving the reaction of lanthanum(III) oxide, calcium oxide (or carbonate), strontium peroxide, manganese metal powder and sodium p…
Purification, chemistry and application are three very important aspects of current research on carbon nanotubes (CNTs). In the dissertation, the purification of nitric acid treated single-walled carbon nanotubes (SWNTs), the dissolution and dichlorocarbene addition of SWNTs, and the effects of chemically functionaliz…
This paper concentrates on CAD/CAM for a special yet useful type of 3D cellular woven structure. Mathematical algorithms have been developed for the creation of weave diagrams and lifting plans for the design and manufacture of this type of 3D woven structure. The algorithms are implemented in a newly created CAD/CAM…
Novel liquid crystal compounds having a difluoromethyleneoxy group as a linkage group have been prepared by the new synthetic method using dibromodifluoromethane in good yield. From the results of physical property measurements; i.e., transition temperature, dielectric anisotropy (Δ˜), birefringence (Δn) and viscosity…
The synthesis and the crystal structures of two platinum bis-ethynyl-phenyl-nitronyl-nitroxide complexes are reported and solution EPR investigations evidenced the intramolecular exchange interaction through a diamagnetic transition metal based spacer.
Reactions of [Tp*Rh(coe)(MeCN)](; Tp*= HB(3,5-dimethylpyrazol-1-yl)(3); coe = cyclooctene) with one equiv. of the organic disulfides, PhSSPh, TolSSTol (Tol = 4-MeC(6)H(4)), PySSPy (Py = 2-pyridyl), and tetraethylthiuram disulfide in THF at room temperature afforded the mononuclear Rh(III) complexes [Tp*Rh(SPh)(2)(MeCN…
Molecular dynamics simulations of thermal conduction in nanoporous thin films are performed. Thermal conductivity displays an inverse temperature dependence for films with small pores and a much less pronounced dependence for larger pores. Increasing porosity reduces thermal conductivity, while pore shape has little e…
Abstract In this paper we present a way of modeling crystallization in polymers within the confines of a new general framework that has been developed to describe materials undergoing dissipative processes. Crystallization in polymers is in general an irreversible process, and a characteristic of all such processes is…