Materials Literature
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Abstract Difunctional acrylates and methacrylate monomers have been made which are high order smectic liquid crystal (or crystalline) at room temperature. This report discusses materials with the following structure: F–S–M–S–F, where F is a functional group, acrylate or methacrylate (A or M); S is a spacer (CH 2 ) n (…
Nematic droplets are intimately connected with disclinations, because in nematic droplets, point and line-shaped defects, as well as surface defects, are not generated at random, but inevitably by topological constraints. Thus, droplets provide a good means for investigating nematic defects. There is a growing interes…
The corrosion behaviour of aluminium in 1.0 mol l–1 solutions of HCl, H2SO4, HNO3 and HClO4 has been investigated in the presence and absence of added Cl– ions. The rate of corrosion of the metal in HCl and in acid solutions containing Cl–, was significantly higher than in the other solutions studied and is attributed…
The impedance of a poly(vinylferrocene)-modified electrode fits a transmission line model that has two resistances R1 and R2 and a capacitance CΣ. The low-frequency resistance, R1, passes through a minimum as the coat is oxidised. This is explained in terms of bimolecular electron-exchange reactions between redox cent…
The defect structure and amorphization of 4.0 fJ (25 keV) D+ and He+ irradiated highly-oriented pyrolytic graphite have been systematically investigated in terms of irradiation dose and temperature. The graphite irradiated by either D+ or He+ is amorphized at a different critical dose, but the calculated critical dpa…
It is shown that all the universal properties of glasses can be explained in the framework of the Soft Potential Model (SPM). At low temperatures (below a few kelvin) this model is equivalent to the well-known model of two-level systems of Anderson, Halperin, Varma and Phillips, which explains quite well the universal…
The effect of the initial orientation of each grain on the recrystallization behavior at 973 K after 70% cold-rolling of solidified columnar crystals in a 19% Cr ferritic stainless steel have been investigated. It was demonstrated that the recrystallization kinetics, the recrystallizaztion microstructure and the orien…
The glass state properties and characterization crystallo-chemistry and physical chemistry of germanium oxides the structure and properties of glass-forming GeO2 the structure and properties of binary germanate glasses the physical and chemical origins of the germanium anomaly the structure and properties of ternary g…
The densities and thermal expansivities of F-bearing haplogranitic glasses and liquidshave been investigated using a combination of scanning calorimetry and dilatometry.F2O-1 reduces the density of haplogranitic liquids (at 750 °C) from 2.295 + 0.006 g/cm3to 2.261 + 0.005 g/cm3 with the addition of 4.55 wt% F (0.33% p…
The role of fat crystals in the stabilisation of air bubbles in cake batters was studied with aqueous phase aerations prepared by the "all in one" method using shortening containing emulsifier. During mixing, fat crystals become coated with an interfacial layer of ad sorbed protein (crystal -water interface). They ads…
Article Chemical Properties of Element 105 in Aqueous Solution: Back Extraction from Triisooctyl Amine into 0.5 M HCl was published on January 1, 1993 in the journal Radiochimica Acta (volume 60, issue 1).
The electron-transfer salt 4[Cr(C5Me5)2]+[TCNE]˙–(TCNE = tetracyanoethylene) has been prepared and structurally characterized by single-crystal X-ray diffraction. It possesses a solid-state motif of parallel 1D chains of alternating radical rations and anions similar to, but not isostructural to, the ferromagnet [Fe(C…
The identification of desmutagens and bioantimutagens in plants has prompted the search for additional plant extracts capable of modifying adverse cellular effects of environmental toxicants. The protective action of crude extracts of Phyllanthus emblica fruits (PFE) against lead (Pb) and aluminium (Al)-induced sister…
Silica gel with a specific surface area, SBET, of 322 m2 g–1, and an average pore diameter of 6 nm, has been chemically modified with NbV oxide by a grafting reaction. The quantity of attached atoms was 8.9 × 10–2 mol g–1 with a surface density of 1.7 atoms nm–2. The XPS technique showed that the atomic Nb/Si ratio of…
The formation of a mesophase in α‐sexithienyl is reported which cannot be identified as either a nematic or smectic phase. On heating, it is also shown that, through careful control of the reaction conditions, crystalline polythiophene comparable in quality with that prepared by electrosynthesis or other synthetic met…
The kinetics of dissolution of differently prepared amorphous aluminosilicate precursors having various Si : Al molar ratios have been studied by measuring the change in the aluminium and silicon concentrations in the liquid phase as well as the change in the degree of Si polycondensation in the liquid phase during th…
Three new low-molar-mass liquid crystals are reported, each of which shows remarkable phase behaviour. One of the materials exhibits a temperature-dependent unwinding of the helix in the cholesteric (chiral nematic) and chiral smectic C phases. This is the first example of a single, pure material to show both of these…
Partial table of contents: Formulation Development (E. Wickson). Solution Vinyl Resins (K. Szoc & R. Burns). PVC Latexes (J. Goots & M. Moore). Monomeric Plasticizers (L. Krauskopf). Epoxy Plasticizers (J. Lutz). Lead Stabilizers (B. Engelbart). Lubricants (R. Grossman). Carbonate Fillers (T. Ferrigno & E. Wickson). C…
A molecular bowl has been prepared by constructing a metalloporphyrin on one face of a tetrameric cyclocholate; the bowl selectively binds morphine by a combination of nitrogen–metal ligation and hydrogen bonding.
A non-formaldehyde crease-resistant finishing method for silk has been developed by using citric acid as a crosslinking agent. Both the dry and wet resiliency of finished silk were remarkably increased. The finished silk had a dry wrinkle recovery degree (WRD) of more than 280° compared to 265° and 217°, respectively,…