The force-distance curves of 12-2-12 and 12-4-12 Gemini quaternary ammonium bromide surfactants on mica and silica surfaces obtained by atomic force microscopy (AFM) were correlated with the structure of the adsorption layer. The critical micelle concentration was measured in the presence or absence of electrolyte. The electrolyte effect (the decrease of CMC) is significantly more pronounced fo...

Palygorskite (Pal) is a natural clay mineral with fibrous morphology and high surface area. Depending on the geological origin, it presents impurities, such as quartz carbonates, which can harm some of its properties. Therefore, this work seeks to define viable methodology for purification Brazilian Pal. Two types mixing processes (sonication milling) two dispersing agents (sodium silicate sodi...

Abstract This paper reports new hierarchical cementitious composites developed using microcrystalline cellulose (MCC), sisal fibers and cetyltrimethylammonium bromide (CTAB) as the dispersing agent. MCC was dispersed in water without with CTAB at different concentrations ultrasonication optimum concentration for achieving homogeneous stable suspensions found to be 40%. Hierarchical were fabrica...

This study aims to determine the effect of nanocrystalline cellulose and potassium chloride (KCl) bioplastics from avocado seed starch glycerol as plasticizer. In this study, nanocrystal obtained palm fruit fiber was hydrolyzed using sulfuric acid (H2SO4) at a concentration 50%. The used in extraction process. On producing bioplastic, casting method with addition filler 1%, 2%, 3%, 4% (%w), KCl...

A possibility of getting SERS spectra of insoluble aromatic compounds in colloidal silver solutions is described. The method tested for the organic pigment quinacridone quinone consists of dispersing it in calix[n]arenes. The potentials of such cavitands, both as dispersing and as silver functionalization agents, is reported as a function of the substitution in their lower rim and their cavity ...

Biofilm-associated infections pose a complex problem to the medical community, in that residence within the protection of a biofilm affords pathogens greatly increased tolerances to antibiotics and antimicrobials, as well as protection from the host immune response. This results in highly recalcitrant, chronic infections and high rates of morbidity and mortality. Since as much as 80% of human b...

agent technology is an emerging and promising research area in software technology, which increasingly contributes to the development of value-added information systems for large healthcare organizations due to its capability to automatically modify themselves in response to changes in their operating environment. multi agent system (mas) approach is the construction of a complex system as a se...