The invention provides a redispersible powder and aq. dispersions comprising nanoparticles of water insol. org. compds. The invention further provides methods for prepg. the redispersible powder and the aq. dispersion, wherein the methods comprise prepn. of an oil-in-water microemulsion and solvent removal. Thus, an oil-in-water microemulsion was prepd. contg. sodium dodecyl sulfate (SDS) 8 %, Bu acetate 3.5 %, 2-propanol 3.5 %, water 82 % and Pr paraben 3 %. [on SciFinder(R)]

The invention provides a redispersible powder and aq. dispersions comprising nanoparticles of water insol. org. pesticides. The invention further provides methods for prepg. the redispersible powder and the aq. dispersion, wherein the methods comprise prepn. of an oil-in-water nanoemulsion or microemulsion and solvent removal. The invention also provides pesticidal compns. comprising the redispersible powder and/or aq. dispersions. [on SciFinder(R)]

The binding mechanism of poly(diallyldimethylammonium chloride), PDAC, and sodium dodecyl sulfate, SDS, has been comprehensively studied by combining binding isotherms data with microcalorimetry, zeta potential, and cond. measurements, as well as ab initio quantum mech. calcns. The obtained results demonstrate that surfactant-polymer interaction is governed by both electrostatic and hydrophobic interactions, and is cooperative in the presence of salt. This binding results in the formation of nanoparticles, which are pos. or neg. charged depending on the molar ratio of surfactant to PDAC monomeric units. From microcalorimetry data it was concluded that the exothermic character of the interaction diminishes with the increase in the surfactant/polymer ratio as well as with an increase in electrolyte concn. [on SciFinder(R)]

Alginate-gelatin beads with dispersed droplets of a model pheromone, dodecyl acetate, were prepd. as a vehicle for slow release of pheromones into the atm. over a prolonged period of time. The beads are prepd. in two steps, the first being prepn. of an oil-in-water emulsion composed of dodecyl acetate as the oil phase and gelatin as the emulsifier, which provides steric stabilization. After mixing with alginate soln., this emulsion is embedded within beads by simple electrostatic crosslinking. Bead porosity at micrometric and nanometric scales plays an important role in controlling the release of dodecyl acetate. [on SciFinder(R)]