Micelle formation by ionic surfactants. III. Model of Stern layer, ion distribution, and potential fluctuations

1975 ◽  
Vol 79 (10) ◽  
pp. 1008-1014 ◽  
Author(s):  
Dirk Stigter
Keyword(s):  
Micelle Formation ◽  
Ionic Surfactants ◽  
Ion Distribution ◽  
Stern Layer ◽  
Potential Fluctuations

IMPACT OF LIPASE ON MICELLE FORMATION AND SOLUBILIZATION ABILITIES OF NON-IONIC SURFACTANTS

2018 ◽  
Vol 61 (6) ◽  
pp. 54
Author(s):  
Regina A. Smith ◽  
Elena Yu. Demyantseva ◽  
Ol’ga S. Andranovich
Keyword(s):  
Surface Activity ◽  
Micelle Formation ◽  
Enzyme Concentration ◽  
Ionic Surfactants ◽  
Ionic Surfactant ◽  
Paper Mills ◽  
Mixed Aggregates ◽  
Experimental Surface ◽  
Solubilizing Capacity ◽  
Hydrophobic Areas

Biotechnology is one of the fastest growing sector of scientific and applied activities of the humans, which needs to be successfully integrated into existing technologies. Such upcoming trend is the combination of conventional pulp treatment by surfactants and enzymatic processing in order to prevent pitch troubles in the pulp and paper mills. This article presents the research results of the abilities of non-ionic surfactants (sintamid-5, sintanol DS-10), enzyme (lipase) and their syner-gistic combinations to the micelle formation and solubilization. We chose the optimal synergistic compositions and investigated their colloid-chemical characteristics. There is no effect to the micelle formation ability of surfactants when addition of lipase is up to 30%. The largest deviation from the additive values of surface activity was observed for the mixture of individual non-ionic surfactant and lipase at the ratio of 70:30. However, in the all mixtures of both surfactants and lipase the ratio of experimental surface activity to the theoretically calculated is less than one. It looks, that hydrophilic areas of mixed aggregates block hydrophobic areas of lipase thereby preventing adsorption of lipase at the interface. A predominance of the surfactant in the composition will reduce its cost. The maximum of solubilizing capacity has sintanol DS-10 due to its highest HLB and the lowest CMC that leads to more micelles amount in solution and higher total hydrocarbon volume. The pitch solubilization in lipase solutions does not depend on enzyme concentration. The high pitch dissolving in synergistic mixture of sintanol DS-10 and lipase is observed. It is predetermines the usage of such systems for cellulose deresination.For citation:Smith R.A., Demyantseva E.Yu. Andranovich, O.S. Impact of lipase on micelle formation and solubilization abilities of non-ionic surfactants. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 6. P. 54-60

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