Materials Literature
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Chitosan-like materials were extracted from five different fungal cells with NaOH and acetic acid, with the yields varying from 1.2 to 10.4% of the dry fungal cell weight. The degree of N-acetylation of the extracts measured by the colloidal titration method varied considerably depending on the individual species. By…
Crystal geometry and symmetry Diffraction geometry and its practical realization Preparation and examination of specimens Determination of lattice parameters Interpretation of diffracted intensities Measurement of intensities Refinement of structural parameters Basic structural features Precautions against radiation i…
In response to severe quality requirements resulting from remarkable progress in rolling techniques, composite type high performance roll was developed. With the adoption of this method, tough core metal, fine structure and high alloy at shell metal can be obtained with ease. Rolls with shell metal of high speed tool…
Abstract Sandy Coastal Plain soils have relatively low reserves of K and may not be able to supply adequate K for intensive corn ( Zea mays L.) production. Field experiments were conducted on Dothan loamy sand (fine‐loamy, siliceous, thermic Plinthic Paleudult) for 3 y to determine K fertilizer rate and placement effe…
Net-collected Ethmodiscus spp. were examined and found to be capable of positive buoyancy with ascent rates averaging 1.4 m h−1 on individually measured cells, and 0.3 m h−1 using a homogeneous settling technique. These data, together with published reports of positive buoyancy in Rhizosolenia, indicate that upward mo…
The purpose of this paper is to review the multiscattering models for spherical particles, quasistatic mixture laws, effective medium theories, percolation equations, and finally the general effective medium equation (GEM), which are all used for modeling the dielectric properties of complex mixture materials. These a…
A large glass forming region, which includes both homogeneous and phase separated glasses, has been found for the yttrium aluminosilicate system. Both the density (2.9 to 3.7 g/cm 3 ) and refractive index (1.54 to 1.72) of these glasses increase dramatically with increasing yttria content, but only slightly with incre…
Reaction of silica, montmorillonite and polystyrene bearing amino functions with several polyhalogenated metalloporphyrins gave an easy one-step access to new supported catalysts, owing to a selective nucleophilic substitution of the para-halogen atoms of the porphyrin meso-aryl groups by the polymer amine function; t…
The barium titanates BaTiO3, Ba2TiO4, BaTi2O5 and BaTi4O9 can be synthesized by a sol–gel method at low temperatures. The reaction between barium acetate solutions and titanium(IV) isopropoxide leads to the formation of barium titanate gels. The gels can be converted to the barium titanates by drying and calcination.…
A new, better method of producing cotton covered/polyester staple-core yarn on a modified ring spinning frame is described. The method uses the concept of twisting a “sandwich” formed by two drafted strands of cotton (rovings) on the outside and a drafted strand of polyester on the inside, thus using a total of three…
The shapes of 112 Co(II)O 6 polyhedra in 72 crystal structures of inorganic compounds were analyzed in this study. Most of these polyhedra are significantly distorted from the ideal octahedral symmetry m 3 m , observed point symmetries of the Co(II) sites are: 1(34%); [unk](29%); 2(14%); m (7%); 2/ m , 3(4%); [unk] m…
Rhodesite from Zeilberg, Unterfranken, Germany ( Z ), from Trinity County, California, USA ( TC ), and from San Venanzo, Rieti, Italy ( SV ), is orthorhombic with space group Pmam . Crystallographic data, given in the order ( Z ), ( TC ), ( SV ), are: a 0 = 23.416(5)/23.444(5)/23.428(20) Å, b 0 = 6.555(1)/6.553(1)/6.5…
The adsorption of No2 on anatase and deuteroxylated TiO2 is investigated by IR spectroscopy. It is established that NO2 reacts with the surface hydroxyl (deuteroxyl) groups of anatase to give nitrates and water molecules (H2O, HOD and D2O) weakly bonded to the nitrates, while on the surface Lewis acidic–basic pairs of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectra and gas chemisorption of Langmuir-Blodgett layers of lutetium and ytterbium diphthalocyaninesR. E. Clavijo, D. Battisti, R. Aroca, G. J. Kovacs, and C. A. JenningsCite this: Langmuir 1992, 8, 1, 113–117Publication Date (Print):January 1, 1992Pu…
The evolution of a Spanish montmorillonite with acid treatment has been studied. With a high concentration of acid, 8 mol dm–3 HCl, there is a break in the normal tendency of the observed behaviour. The silica created at the beginning of the reaction protects the clay structure and impedes subsequent attack. This pass…
The first edition of this highly successful text aimed, 'to deal with the basic principles of materials science in a simply yet meaningful manner'. The second edition broadened the scope to incorporat
This book is split into two sections; the first covers the characterisation of polymer molecules with respect to chemical composition, configuration and molecular mass, while the second and larger section is a thorough discussion of polymer morphology and the techniques used in its investigation.Each chapter of the bo…
Treatment of fluorinated ethylene propylene (FEP) and polytetrafluoroethylene (PTFE) by plasmas established in water vapour or ammonia gas enabled the rapid and facile modification of their surface chemistries. Under comparable plasma conditions, ammonia plasma exposures produced considerably lower air/water contact a…
A simple method to determine the fluorescence quantum yield (ϕF) of dyes adsorbed on microcrystalline cellulose is presented. The method is based on corrected fluorescence emission spectra and can easily be applied provided the energy profile of excitation is accurately determined. The quantitative determination of ϕF…
Crystals of 1,4,8,11,15,18,22,25-octahexylphthalocyanine are composed of tilted stacks of molecules with an unexpectedly large separation between the aromatic cores.