Transition metal complexes of porphins, corrins and related compounds
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Enthalpy of formation of aluminium chloride
The standard enthalpy of formation of aluminium chloride has been measured by reacting aluminium with chlorine gas in the presence of an excess of liquid chlorine in a glass combustion vessel inside a calorimeter at 298 K. Complete reaction was achieved. The heat of evaporating part of the chlorine into the previously…
Phytofabrication of silver nanoparticles by using aquatic plant Hydrilla verticillata
Abstract. Sable N, Gaikwad S, Bonde S, Gade A, Rai M. 2012. Phytofabrication of silver nanoparticles by using aquatic plant Hydrilla verticillata. Nusantara Bioscience 4: 45-49. In the context of current drive to developed new green technology in nanomaterials, synthesis of nanoparticles is of considerable importance.…
The separation of proteins with heteropolyacids
Abstract The precipitation of proteins with heteropolyacids has been studied for the purpose of large scale primary purification. A precipitate will form if the pH of the reaction between purified ovalbumin, hemoglobin, trypsin, pepsin, bovine serum albumin, ovomucoid, gelatin or ribonuclease and tungstrophosphoric, t…
Inhibition of the second limit of the hydrogen + oxygen reaction by hydrogen bromide
The inhibition of the thermal reaction between hydrogen and oxygen by hydrogen bromide has been studied over a wide range of mixture composition and vessel diameter at 500°C using vessels coated with boric acid. Under these conditions, surface reactions are unimportant and the inhibition arises through the sequence of…
Studies on the Tanning with Glutaraldehyde as an Alternative to Traditional Chrome Tanning System for the Production of Chrome Free Leather
Chrome tanning is a versatile tanning system, but the pollution problems of chromium due to inadequacy of treatment systems and possible formation of Cr(VI), a carcinogen, have led to search for an ecofriendly and viable alternative tanning system. The present investigation focuses on the development of a novel, high…
The crystal structure of triploidite and its relation to the structures of other minerals of the triplite-triploidite group
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Studies on the formation of O/W nano-emulsions, by low-energy emulsification method, suitable for cosmeceutical applications.
The formation of oil/water (O/W) nano-emulsions suitable for cosmeceutical application was studied. Nano-emulsions were prepared by using phase inversion composition (PIC) method, one of the low-energy emulsification methods. The process consist of stepwise water addition to oil/surfactant mixture, at T = 25°C. Capryl…
Surface modification of polycarbonate (bisphenol A) by low pressure rf plasma
Effects of low pressure radio frequency (rf) plasma treatment on the surface properties of polycarbonate are presented in this paper. Results obtained from the surface energy measurement after different conditions of treatment are compared. After treatment the surface free energy increased from the original value of 3…
Electrical and optical properties of transition-metal oxides
Transition-metal oxides can be insulators, semiconductors, metals, or undergo semiconductor-metal transitions. The nonmetallic materials are characterized by a primarily localized optical spectrum but a band-like electrical conductivity. However, a pure band approach predicts metallic rather than nonmetallic behavior,…
Phonon-assisted current in organic molecular crystals
It is shown that in organic molecular crystals the fluctuations of the intermolecular electron jump frequencies resulting from the lattice vibrations may produce a considerable increase of the total electric current. An expression for the current density operator, which takes into account the electron-phonon interacti…
Nanotechnology in Brain Targeting
Nanotechnology offers a vision for a ‘smart’ drug approach involving the design, synthesis, and characterization of materials and devices that have a functional association in nanometer scale. One area in which nanotechnology may have a significant clinical impact in neuroscience is the selective transport and deliver…
Effects of sintering temperature on microstructure and magnetic properties of NiFe<sub>2</sub>O<sub>4</sub> prepared from nano size powder of NiO and Fe<sub>2</sub>O<sub>3</sub>
Polycrystalline NiFe2O4 was prepared by solid state reaction from nano size powder of NiO and Fe2O3 which were synthesized by wet chemical method. The inverse spinel single phase of the sample has been confirmed by the X-ray diffraction patterns. SEM micrographs of the samples revealed that the grain size increases an…
Tracer study of the kinetics of dissolution of barium sulphate
The dissolution into water of barium sulphate labelled with 35S has been studied from 10.5 to 35°C. The kinetics proved to be second order to at least 85 % saturation, the activation energy being 24.7 ± 0.8kJ mol–1. Diffusion control of the dissolution process was not observed.
Wetting Kinetics and the Strength of Adhesive Joints
The work of adhesion, depending solely on the contact angle and surface tension, is unreliable as a guide to the strength of a joint. The kinetics of joint formation, exemplified by the rate of wetting, is also important and can be measured by rate of change of contact angle, a process for which an empirical equation…
Two-Magnon Bound States in the Heisenberg Ferromagnet with Anisotropic Exchange and Uniaxial Anisotropy Energies
An exact theory for the two-magnon bound state problem in the Heisenberg ferromagnet with arbitary spin S and arbitrary dimensionality is developed at absolute zero temperature. The Hamiltonian which describes the system is assumed to include a nearest neighboring anisotropic exchange interaction and a one-ion type an…
Effects of Titanium in Alnico 8-Type Magnet Alloys
Alnico 8-type magnet alloys containing more than 5% Ti have been well-known to have very high coercive forces, particularly when the isothermal field treatment is applied. As a primary approach in this research to explore its cause, the transformations, microstructures and magnet characteristics were investigated in a…
The structure of the organic mammillary cores in some weak egg shells
Synopsis The microscopic structure of the outermost layer of the outer shell membrane containing decalcified mammillary cores of some of the egg shells laid by a large flock of Shaver 288 Starcross hybrids from November 1967 to September 1968 has been examined. It has been found that a high percentage of the weak and…
Preparation of some sulphur-containing polypyrrolic macrocycles. Sulphur extrusion from a meso-thiaphlorin
The preparation of a meso-thiaphlorin, meso-thiaporphin, and a porphin analogue containing two thiophen rings is described together with several examples of extrusion of sulphur from polypyrrole macrocycles.
Performance of Sudanese activated bentonite in bleaching cottonseed oil
Bentonite clay collected from Jabal Umm Ali area NE of Khartoum (Sudan) was characterized by X-ray diffraction (XRD). It was then purified by treatment with distilled water and activated with sulfuric acid at 90 ºC for 3.5 hrs. XRD indicated modification of activated bentonite with enhanced surface area. Several catio…