Synthesis of spherical particulate polysiloxane resins as catalyst supports
Spherical particulate polysiloxanes are synthesised for the first time, chemically derivatised and employed as a support in molybdenum(VI) catalysed alkene epoxidation.
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Adhesively bonded assemblies with identical nondeformable adherends: modeling of the induced thermal stresses in the adhesive layer
A thermoelastic problem for adhesively bonded assemblies with identical nondeformable adherends is considered. The objective of the analysis is to develop a simple stress model for the evaluation of thermally induced stresses and strains in the adhesive material due to its thermal expansion (contraction) mismatch with…
Anodization and Speciation of Magnesium in Chloride‐Rich Room Temperature Ionic Liquids
Magnesium anodization was examined in room temperature :EMIC and :DMPIC ionic liquids, where EMIC = 1‐ethyl‐3‐methylimidazolium chloride and DMPIC = 1,2‐dimethyl‐3‐propylimidazolium chloride. For all melts, the :organic chloride mole ratio was <1, yielding chloride‐rich ( i.e. , basic) compositions. The rate of magnes…
High-temperature adsorption of carbon monoxide and hydrocarbon gases over nickel and platinum catalysts
The high-temperature (573 K) adsorption of ethene, propene, propyne, carbon monoxide, and the high temperature co-adsorption of propyne–carbon monoxide have been studied over Pt/alumina and Ni/silica catalysts. The Pt catalyst was found to retain hydrogen from the reduction process, this hydrogen being released by eth…
Mass Transfer between Gases and High Viscosity Liquids on Rotating Cylinder with Surface Renewal Action.
In many polymer manufacturing processes, mass transfer operations between a high viscosity liquid and gases are applied, but mass transfer rates have been explained only using kLa. We measured kL for molten polystyrene and corn syrups by using a rotating cylinder with surface renewal action in which surface area was k…
Formation of separated versus contact ion triples in heavy alkaline-earth thiolates
The synthesis and structural characterization of the alkaline-earth thiolates [Sr(18-crown-6)(hmpa)2][SMes*]2 and [Ba(18-crown-6)(hmpa)(SMes*)][SMes*], displaying rare ion association modes with only one or no cation–thiolate linkages are presented.
The Influence of Phonon Scattering on HREM Images
The influence of thermal atomic vibrations in high-resolution electron microscopy is modeled by combining time-resolved molecular dynamics simulations with the multislice algorithm of HREM image simulation. The material studied is stoichiometric NiAl-B2 at room temperature and at 900 K. The difference between the new…
Surface and Interface-New Functions of Biorelated Polymers I. Synthesis and Properties of Chitin Phosphate.
イカ由来β-キチンのN, N-ジメチルホルムアミド (DMF) -尿素溶媒中オルトリン酸との反応により, 高収率でリン酸化キチンを合成できた. 本反応はキチンの低分子量化を伴わず, リン酸基の導入率は反応溶媒DMFと尿素の比率で制御可能であった. 生成物のリン酸基置換度は0.25～1.4のものが得られ, 置換度0.25以上の誘導体は水溶性であった. 水溶性リン酸化キチンはカルシウムイオンを吸着して, 不溶性のアモルファス, ゲル状キチン誘導体が得られた. また牛血漿を用いた血液凝固試験でリン酸化キチンは凝固の促進作用を有することが示された.
Role of Interface Structure on Mechanical Properties of Fluorine-Doped Si<sub>3</sub>N<sub>4</sub>-SiC Ceramics
Changes in interface chemistry and, accordingly, in interface structure of a Si3N4-SiC ceramic, due to the presence of fluorine, was found to markedly affect the mechanical response of the material. Owing to a lowered cohesive interface strength, as a consequence of fluorine segregation at grain and phase boundaries,…
Synthesis of Chromium Borides by Solid-State Reaction between Chromium Oxide (III) and Amorphous Boron Powders
In the solid-state reaction between ultrafine chromia powder, which was produced by the decomposition of chromium formate, and amorphous boron powder, Cr5B3, CrB, Cr3B4, Cr2B3 and CrB2 were obtained at the mole ratios of 1.5 to 7.0 at 1600°C in vacuum for 2h. A single phase of CrB was formed at the mole ratio of 3.0 a…
Machinability of High-Strength Porous Silicon Nitride Ceramics
A machinability of porous Si3N4 ceramics composed of columnar β-Si3N4 grains was evaluated by turning and milling with cemented carbide cutting tools to investigate a possibility of application of the porous Si3N4 to machinable ceramic use. The porosity and the flexural strength of specimens were about 43% and 270MPa,…
Theory and preliminary measurements of the Rayleigh-like collapse of a conical bubble
Key to the dynamics of the type of bubble collapse which is associated with such phenomena as sonoluminesence, and the emission of strong rebound pressures into the liquid, is the role of the liquid inertia. Following the initial formulation of the collapse of an empty spherical cavity, such collapses have been termed…
Overview of Flame Retardants Including Magnesium Hydroxide
There are many classes of compounds which are useful as flame retardants. Inorganic minerals, organo-phosphates, and halogenated compounds are all commonly used for their ability to inhibit combustion and smoke generation in plastics and other materials. In 1993, United States industries consumed 810 million pounds of…
Electron Microscopic Study of the Illite-Smectite Transformation in the Bentonites from Cerro Del Aguila (Toledo, Spain)
A mineralogical and microstructural study of bentonites from ‘Cerro del Aguila’ located in the Tagus Basin (Toledo, Spain) was carried out using XRD, SEM and TEM observations and chemical data obtained by TEM-EDX. The bentonites are mainly composed of trioctahedral smectite with a unit-cell formula (Si3.76Al0.24)(Al0.…
A simple and quick technique for establishing axenic cultures of the centric diatom Coscinodiscus wailesii Gran
We devised a simple and quick technique for establishing axenic cultures of the centric diatom Coscinodiscus wailesii Gran by washing the cells with a sieve and soaking them in antibiotic media.
Tetranuclear iron(III) complexes with amino acids involving a planar (μ-oxo)(μ-hydroxo)bis(μ-alkoxo)bis(μ-carboxylato)tetrairon core †
Reactions of FeIII(NO3)3·9H2O with 0.5 equivalent of 2-hydroxypropane-1,3-diamine-N,N,N′,N′-tetraacetic acid (H5dhpta) and an excess of amino acid [glycine (Gly) or L-alanine (L-Ala)] in water with the pH adjusted to ca. 5 by a solution of NaOH gave pale green crystals formulated as Na[Fe4(dhpta)2(µ-O)(µ-OH)(O2CCHRNH3…
Synthesis, crystal structures and dynamic NMR studies of novel trinuclear copper(I) halide complexes with 2,5-bis[(diphenylphosphino)methyl]thiophene
Novel trinuclear copper(I) halide complexes with 2,5-bis[(diphenylphosphino)methyl]thiophene (dpmt), [Cu3(µ3-X)(µ-X)2(µ-dpmt)2] (X = I 1, Br 2 or Cl 3), have been synthesized and structurally characterised. They have unusual three-runged ladder structures with one triple-bridging and two double-bridging halide atoms.…
Fouling and Cleaning of Stainless Steel Surface: Adsorption and Desorption Behavior of Bovine Serum Albumin and Gelatin.
Adsorption and desorption behavior of bovine serum albumin (BSA) and gelatin on the surface of stainless steel particles are studied. The amount of BSA adsorbed increases significantly with temperature above 60°C whereas that of gelatin decreases slightly with increasing temperature. Results of adsorption experiments…
Crystal structure, thermal and magnetic properties of La4Co3O9 . Phase relations for La4Co3O10−δ (0.00≤δ≤1.00) at 673 K
Phase relations and reoxidation behaviour is reported for samples with nominal composition La4Co3O10–δ(0.00≤delta;≤1.00) synthesized by isothermal reduction at 673 K. The crystal structure of La4Co3O9 has been determined on the basis of high-resolution powder X-ray diffraction and neutron diffraction data. The space g…
Electrical conductivity of short carbon fiber filled HDPE/PMMA blends: effect of molding temperature and time
The effect of molding temperature and time on the electrical conductivity of Vapor Grown Carbon Fiber (VGCF) filled High Density Polyethylene (HDPE)/Poly(methylmethacrylate) (PMMA) blends has been investigated. The dispersion state of short carbon fibers in polymeric matrix is affected not only by the volume fraction…