sphere-like shaped cobalt oxide nanoparticles (co3o4) were synthesized by a simple wet chemical method using cobalt chloride as precursor and cetyl trimethylammonium bromide (ctab) as surfactant. their structural and surface morphologial properties were characterized by high resolution transmission electron microscopy (hrtem), field emission scanning electron microscopy (fesem) and x-ray diffra...

Quaternary pyridinium salts with chains ranging from C8 to C20 belong in the large group of cationic surfactants. In this paper, the preparation of such cationic surface active agents based on the pyridinium moiety and differing in the length of the N-alkyl chain is described. Additionally, HPLC technique was established to distinguish each prepared pyridinium analogue. This study represents un...

Despite numerous attempts to develop and evalute specsc methods for the histochemical demonstration of mucopolysaccharides, definitive information is not readily available. Thls is in spite of the notable contributions of Hale ('46); Steedman ('50); Gomori ('50); Kramer and Windrum ('54); Mowry ('56, '58); Spicer ('60); Belanger and Migicovsky ('61) and Goldstein ('62) to mention only a few. Wi...

Wormlike micellar surfactant solutions are encountered in a wide variety of important applications, including enhanced oil recovery and ink-jet printing, in which the fluids are subjected to high extensional strain rates. In this contribution we present an experimental investigation of the flow of a model wormlike micellar solution (cetyl pyridinium chloride and sodium salicylate in deionised w...

Pretreatment of dentin using colloidal platinum nanoparticles (CPtN) can enhance the bond strength of dentin adhesives. However, the combination of CPtN, which is negatively charged, with cationic monomer-containing adhesive may reduce the antibacterial activity of the original material. Thus, the purpose of this study was to assess the effect of CPtN on the bactericidal activity of two cationi...

The Cosmetic Ingredient Review (CIR) Expert Panel (Panel) assessed the safety of 16 alkyl ethylhexanoates for use in cosmetics, concluding that these ingredients are safe in cosmetic formulations in the present practices of use and concentrations when formulated to be nonirritating. The alkyl ethylhexanoates primarily function as skin-conditioning agents in cosmetics. The highest concentration ...

The effect of temperature on the sulfate adsorption capacity adsorbents prepared from corn stalks (Zea mays) was evaluated. Two bioadsorbents were biomass: a biochar modified with H2SO4 mass: volume ratio 1:1 (B 1:1), and cellulose cetyl trimethyl ammonium chloride (CTAC). There also determined thermodynamic parameters (?G°, ?S° ?H°) it studied kinetics isotherm. At 25 °C obtained highest 16.4 ...

the kinetics of iodination of the phenol and substituted phenols using pyridiniumiodochloride in methanol has been studied under varying conditions. the rates show first orderkinetics each in pyridinium iodochloride and phenols. the rates of reactions are measured atdifferent temperature and activation parameters for all phenols computed. hammett plot is foundto be valid and the corrletion betw...