Browsing by Author "Mestre, Javier Nieto"
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Item Stability of inverse microemulsions of acrylamide-based anionic flocculants: Evidence about the need of unsaturated surfactants(2008-02-20) Ochoa G, José R.; Marta Muñoz, H.; Reinoso, Diego; Sasia, Pedro M.; Escudero, Francisco J.; Río, Francisca; Mestre, Javier Nieto; Torrecilla, Jesús; ECONOMÍA CIRCULAR; VALORIZACIÓN DE RESIDUOS; SGInfluence of surfactant structural characteristics on stability of inverse microemulsions of acrylamide-based anionic flocculants (40% (w/w) sodium acrylate and 60% (w/w) acrylamide, based on total amount of comonomers) has been studied by using 17 surfactant blends consisting of two non ionic surfactants with different length of hydrophobic chains, different number of hydrophobic chains per molecule, and with and without double bonds on their hydrophobic chains. Experimental evidence shows that unsaturated emulsifiers are needed for obtaining stable inverse microemulsions of acrylamide-based anionic flocculants and that presence of double bonds on the hydrophobic tails of a surfactant is its major structural characteristic to stabilize this kind of polymeric inverse microemulsions (PIM).Item Synthesis of cationic flocculants based on acrylamide and [2-(acryloyloxy)ethyl]trimethylammonium chloride co polymers by semicontinuous inverse microemulsion co polymerization. Part I: Criteria for selection of comonomer formulation(2006-06-01) Ochoa, G. José R.; Río, Francisca; Sasia, Pedro M.; Katime, Issa A.; Escudero, Francisco Javier; Díaz De Apodaca, Elena; Mestre, Javier Nieto; ECONOMÍA CIRCULAR; Alimentación Sostenible; VALORIZACIÓN DE RESIDUOSThe influence of surfactant blend composition, organic solvent (oil) structure and cationic charge density (CCD) on stability of comonomer inverse microemulsions of acrylamide and [2-(acryloyloxy)ethyl]trimethylammonium chloride has been studied in order to obtain criteria for selecting comonomer inverse microemulsions before copolymerization resulting in copolymer inverse microemulsion useful as flocculants. Results show that optimum HLB can be explained by cohesive energy ratio theory and it increases with CCD; the higher the hydrophobic chain length of surfactants in surfactant blend, the lower the minimum surfactant blend concentrations (SBCm) needed to obtain stable inverse microemulsions; and linear organic solvents allow a decrease of the SBCm required for stabilizing comonomer inverse microemulsions.