Materials Literature
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We report experimental results for the thermal conductivities of 4-n-pentyl-4'-cyanobiphenyl (5CB) for 19 \ifmmode^\circ\else\textdegree\fi{}CT48 \ifmmode^\circ\else\textdegree\fi{}C. For T${\mathit{T}}_{\mathit{N}\mathit{I}}$=35.17 \ifmmode^\circ\else\textdegree\fi{}C this substance is a nematic liquid crystal, where…
An X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption (TPD) and reduction (TPR) study of LaNiO3 and La2NiO4+δ perovskites has been carried out. The existence of at least two different forms of oxygen in these compounds is shown by both oxygen reactivity (TPD and TPR) and XPS characterisation. XP…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of calcium titanate powders by the sol-gel processGerhard PfaffCite this: Chem. Mater. 1994, 6, 1, 58–62Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://doi.org/10.1021/cm00037a013Request…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRigid-rod polyesters with flexible side chains. 4. Thermotropic behavior and phase structures in polyesters based on 1,4-dialkyl esters of pyromellitic acid and 4,4'-biphenolJunji Watanabe, Brian R. Harkness, Masato Sone, and Hideo IchimuraCite this: Macromolecules 1994, 27,…
The results of dynamic mechanical measurements in tension, made by using two commercial dynamic mechanical instruments, a DMTA (Polymer Laboratories) and a DMA (Perkin Elmer), are compared and discussed. Differences in Tg values of approximately 10°C for an unfilled and a carbon-black-filled natural rubber (NR) were o…
The systematic variation of magnetic permeability and dielectric constant and their relationship with microwave absorbing properties are investigated in sintered Ni-Zn ferrite. Toroidal compacts of (Ni/sub 1-x/Zn/sub x/O)(Fe/sub 2/O/sub 3/)spinels were prepared by conventional ceramic processing technique. The large c…
Thin films of ZnO have been grown by low-pressure MOCVD using methylzinc isopropoxide, MeZn(OPri), and methylzinc tert-butoxide, MeZn(OBut), in the absence of an added oxygen source. The films were grown on to glass substrates in the temperature range 250–400 °C with growth rates of between 0.2 and 4.4 µm h–1.
R. C. Mehrotra, A. Singh and S. Sogani, Chem. Soc. Rev., 1994, 23, 215 DOI: 10.1039/CS9942300215
Description A review of the state-of-the-art of microbiology influenced corrosion (MIC) testing in the early 1990s. Many industrial needs in the area of MIC testing are identified in these papers along with the latest laboratory and field testing techniques. Strategies to monitor and control corrosion and biofouling i…
Colloid chemistry of silica - an overview, Horacio E. Bergna. Part 1 Preparation of sols: silica nucleation, polymerization and growth - preparation of monodispersed sols, Akitoshi Yoshida the formation and interfacial structure of silica sols, John D.F. Ramsay et al synthesis and characterization of colloidal model p…
A number of liquid-crystalline siloxane derivatives based on the 4-(ω-alkenyloxy)-4′-cyanobiphenyl mesogenic unit have been prepared and their phase-transitional properties characterised. The compounds were synthesized by the addition of the 4-(ω-alkenyloxy)-4′-cyanobiphenyl moiety to pentamethyldisiloxane catalysed b…
The red luminescence of bismuth-doped alkaline-earth-metal sulfates is ascribed to the presence of divalent bismuth The optical transitions are due to transitions within the 6p shell.
Five new trisiloxane quaternary ammonium compounds were synthesized from hydrotrisiloxane with allyl glycidyl ether to yield the epoxy function. Various amines were then reacted to yield trisiloxane amines which were further reacted to methyl substitute or oxidize the beta-carbons in order to provide thermal stability…
Colony groups that form large amounts of slime externally were obtained from activated sludge among phthalate-assimilating microbes. That slime, which R-3 mixed microbes produced externally, had a high level of flocculation activity. R-3 mixed strains, one of such colony groups, efficiently produced a bioflocculant (A…
The magnetoelectric effect of Cr2O3 single crystals has been studied in magnetic fields up to 20 T in the range of liquid helium to room temperature In the antiferromagnetic phase for low magnetic fields the well known results for the magnetoelectric effect below the Néel temperature were reproduced. In the spin-flop…
This paper considers the major design factors which constrain the maximum acceleration capability of surface-mounted neodymium-iron-boron permanent magnet motors as used in servo drives. Expressions are derived for typical achievable values of the air-gap flux density and the linear current density around the stator p…
The effect of a two-component dry bonding system consisting of resorcinol and hexamethylene tetramine on the mechanical and viscoelastic properties of short sisal fiber reinforced natural rubber composites has been studied. The studies were conducted with chemically treated and untreated short sisal fibers. Treated fi…
Abstract The dielectric constant of ferroelectric ceramics shows strong Debye‐like relaxation at GHz frequencies. This relaxation is caused by sound generation inside the crystallites. The ferroelastic domain walls which vibrate in the electric ac field are very effective shear wave transducers. The shear wave emissio…
Multilamellar liposomes consisting of dipalmitoyl phosphatidylcholine (DPPC) and dicetyl phosphate (DCP) in a molar ratio of 8:2 (DPPC:DCP = 8:2) were coated with three different types of polymers: chitosan, polyvinyl alcohol having a long alkyl chain, and poly(acrylic acid) bearing cholesterols. The existence of poly…
Sommaire : 1.Fibrous reinforcements for composite materials. 2.Matrices. 3.Fabrication of polymer composites. 4.Mechanical properties of composites - micromechanics. 5.Mechanical properties - macromechanics. 6.Environmental aspects