Mechanistic studies using antihydrophobic agents
Abstract
Materials Literature
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Mesomorphic properties and monolayer behaviour of novel liquid crystalline exo-calix[4]arene derivatives
Novel calix[4]arene derivatives are synthesized. These are pyrogallol-derived exo-calix[4]arenes with twelve 3-oxaalkanoyloxy chains and exo-calix[4]arenes in which eight or twelve rod-like units (phenylthiadiazole and phenylpyrimidine units) are fixed via spacers with the calix [4] arene central core. The liquid crys…
Adsorption of multiblock copolymers at interfaces between selective solvents: Single-chain properties
We consider the configuration properties of a periodic multiblock copolymer made of a regular alternating succession of two monomer species A and B near interfaces betwen two weakly selective solvents \ensuremath{\alpha} and \ensuremath{\beta}. Both solvents are assumed to be good, but their quality is slightly differ…
Aqueous tungstovanadate equilibria
A combined equilibrium study of tungstovanadates involving potentiometry and 51V, 183W and 17O NMR spectroscopy has been able to identify 11 main species, giving their formation constants and pKa values where relevant. Tentative identification was also made of two other non-equilibrium species at lower pH values, in a…
SANS Investigations of Topological Constraints in Networks Made from Triblock Copolymers
A theoretical and experimental investigation of the SANS structure factor of labeled triblock HDH copolymer chains, randomly cross-linked into a network, is presented. We combine the RPA method for the consideration of the strong interchain correlations and the tube model with a harmonic deformation dependent constrai…
Contact Angle and Vapor Adsorption
It is shown that the original Good−Girifalco derivation of an equation for cos θ (where θ is the contact angle of a liquid on a solid) based on intermolecular force (IMF) theory contains an inconsistency which leads to dependence of cos θ on the term −π e /γ L (where π e is the reduction in free energy on equilibraton…
A non-cyanide brass plating bath
Brass electrodeposits are used for decorative applications and for promotion of adhesion of rubber to steel and other metals. Brass coatings, because of their lubricity, are applied on rods and wires which are further subjected to drawing into thinner gauge. Brass deposits are generally obtained from cyanide electroly…
Structural and Magnetic Properties of Fe₂O₅-P₂O₅Na₂O Glasses. Part 1: Oxygen Heat Treatment
The partial crystallisation and magnetic behaviour of 43.3Fe 2 O 3 -52.7P 2 O 5 -4.ONa 2 O wt% glass made into frit, fibres and beads have been investigated before and after heat treatment. The Mossbauer spectra indicated that 90% of the iron was present as iron (III) in the glass frit and fibres while the glass beads…
Fluorine‐Doped Tin Dioxide Thin Films Prepared by Radio‐Frequency Magnetron Sputtering
Tin dioxide thin films doped with fluorine were prepared by using a radio‐frequency (RF) magnetron sputtering method. The target was SnO 2 powder mixed with either SnF 2 or SnF 4 powder. The deposition conditions for obtaining films of low resistivity and their physical characteristics were systematically studied. The…
Heat Treatment Response of Sintered M3/2 High Speed Steel Composites Containing Additions of Manganese Sulphide, Niobium Carbide, and Titanium Carbide
Metal matrix composites based on a sintered M3/2 high speed steel (HSS) and containing either single additions of TiC, NbC, or MnS particles or combined additions of MnS + TiC or MnS + NbC were sintered to full density and subjected to a conventional hardening heat treatment cycle of austenitisation, quenching, and do…
Stereocopolyamides Derived from 2,3-Di-O-methyl-d- and -l-tartaric Acids and Hexamethylenediamine. 1. Synthesis, Characterization, and Compared Properties
Poly(hexamethylene-2,3-di- O -methyl- d, l -tartaramide)s [P6DM(D,L)T], with enantiomeric d / l ratios ranging from 1:9 to 1:1 and weight average molecular weights up to ∼80 000, were obtained by the active ester polycondensation method. The microstructure of these stereocopolyamides was investigated by 1 H and 13 C N…
Raman Longitudinal Acoustic Mode Studies of a Poly(ethylene oxide) Fraction during Isothermal Crystallization from the Melt
Raman longitudinal acoustic mode (LAM) spectra have been obtained during isothermal crystallization from the melt at various temperatures of a poly(ethylene oxide) (PEO) fraction of molecular weight about 3000. At all temperatures, we find an initial single well-defined LAM band corresponding to a helical chain length…
Mechanochemical Degradation of Ethylene−Propylene Copolymers: Characterization of Olefin Chain Ends
We have examined chain ends in ethylene−propylene (EP) copolymers following high-temperature shearing in an extruder. New chemical structures, not present prior to shearing, corresponding to vinyl, vinylidene, and vinylene chain ends were observed via 1 H and 13 C NMR and FTIR spectroscopy. A compilation of the variou…
Influence of the pH‐Value on the Growth and Dissolution Rate of Potassium Chloride
Abstract A fluidized bed crystallizer is employed to investigate the effect of pH of the solution on the growth and dissolution rates of potassium chloride crystals. The growth rate shows a minimum value at the pH range between 7 and 10, whereas the dissolution rate shows a minimum at the range between 7 and 9. It is…
Orientation and Growth of Grains in Copper‐Activated Hot‐Pressed Hexagonal Boron Nitride
Hexagonal boron nitride powder was hot pressed in an environment of metallic copper. When compared with a copper‐free system, the sintered body exposed to the copper was composed of substantially thicker grains having an unusual arrangement, consisting of preferred alignment of (0001) basal planes parallel to the pres…
Does Diisooxocyan (OCN−NCO) Exist?
In a combined experimental and theoretical ab initio study, the reaction of AgOCN with Br2 was investigated. The formation of diisooxocyan, OCN−NCO (2), as a likely intermediate is discussed on the basis of experimentally observed decomposition products and on the grounds of energetic considerations. No evidence for t…
High Nitrogen Steels. In-situ Observation of Dynamic Reacting Species at Pit Precursors of Nitrogen-bearing Austenitic Stainless Steels.
Anodic steady state polarization and potentiodynamic polarization studies were carried out for nitrogen-bearing austenitic stainless steels in 0.6 kmol·m–3 NaCl solution at room temperature. The pitting potential measurement indicated that the pitting resistance increased with increase in nitrogen addition. In-situ di…
Dehydration–rehydration in magnesium vermiculite: conversion from two–one and one–two water layer hydration states through the formation of interstratified phases
The dehydration-rehydration of Mg-vermiculite, as large flakes (7 × 5 × 0.1 mm3) and powder (⩽ 80 µm), has been studied. Samples were treated in a sealed bomb at 140 and 100 °C for several days. After dehydration, they were rehydrated at room temperature. The samples were examined by X-ray diffraction, and the results…
Synthesis of lanthanide(III) complexes of a 20-membered hexaaza macrocycle
Lanthanide(III) and yttrium(III) complexes of the 20-membered hexaaza Schiff-base macrocycle 6,20-dimethyl-2,10,16,24,29,31-hexaazapentacyclo[23.3.1.14,8.111,15.118,22]dotriaconta-1(29),2,4,6,8(30),9,11,13,15(31),16,18,20,22(32),23,25,27-hexadecaene-30,32-diol (H2L3) have been synthesised by metal-template condensatio…
Formation of Methanol by Microwave-Plasma Reduction of CO2 with H2O
Abstract Reduction of CO2 with H2O was carried out by microwave plasma for the formation of methanol. The results of steam chromatography and mass spectrometry showed that the plasma products contained methanol. The methanol formation was also found in H2O-plasma-cleaning process, in which materials which had been dep…