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

Diffusiophoresis in ionic surfactants: effect of micelle formation

Soft Matter ◽  
2019 ◽  
Vol 15 (2) ◽  
pp. 278-288 ◽  
Author(s):  
Patrick B. Warren ◽  
Sangwoo Shin ◽  
Howard A. Stone
Keyword(s):  
Self Assembly ◽  
Surfactant Concentration ◽  
Colloidal Particles ◽  
Micelle Formation ◽  
Ionic Surfactants ◽  
Ionic Surfactant ◽  
Association Model ◽  
Concentration Gradients ◽  
Chemical Association

We explore the consequences of micelle formation for diffusiophoresis of charged colloidal particles in ionic surfactant concentration gradients, using a quasi-chemical association model for surfactant self assembly.

The Effect of Halide Counter Ions and Methanol on the Foaming Behavior of Cationic Surfactants and a Mechanism Study

2021 ◽  
Vol 58 (4) ◽  
pp. 278-286
Author(s):  
Yun Bai ◽  
Jie Zhang ◽  
Sanbao Dong ◽  
Shidong Zhu ◽  
Manxue Wang ◽  
...  
Keyword(s):  
Surface Activity ◽  
Cationic Surfactants ◽  
Foam Stability ◽  
Micelle Formation ◽  
Methanol Concentration ◽  
Effect Of Temperature ◽  
Ammonium Bromide ◽  
Foam Formation ◽  
Mechanism Study ◽  
Cetyltrimethyl Ammonium

Abstract In this work, four quaternary ammonium cationic surfactants including cetyltrimethyl ammonium fluoride (CTAF), cetyltrimethyl ammonium chloride (CTAC), cetyltrimethyl ammonium bromide (CTAB) and cetyltrimethyl ammonium iodide (CTAI) were investigated to study the effect of halide anions on the surface activity and foaming performance. The result showed that CTAF had superior surface activity, which could reduce the surface tension of water to 33.15 mN/m at a low CMC (critical micelle formation concentration) of 1.65 mmol/L. Based on the calculation of Amin (the minimum occupied area per surfactant molecule), we assumed that this higher surface activity was related to the small ionic radius of the fluorine ion (F–). The foamability and foam stability of CTAF has great advantages over other surfactants studied. On this basis, the factors affecting the formation and stabilization of the CTAF foam were investigated. The results showed that foam formation benefited from high temperatures and low methanol concentration, while high salinity was beneficial for foam stability. When CTAF at a concentration of 0.2% was used as a foaming agent, foaming was excellent at a methanol concentration of 10%, a salinity of 22 ⨯ 104 mg/L, and a temperature of 90°C. With this study, uncertainties that existed in the literature regarding the effect of anion on surface activity and foam performance were explained and the effect of temperature, methanol and salinity on foam generation and stabilization was understood.

Comparative Study of Organoclays with Ionic Surfactant

2014 ◽  
Vol 798-799 ◽  
pp. 9-14 ◽  
Author(s):  
B.M.A. de Brito ◽  
Juliana Melo Cartaxo ◽  
Julliana Marques Rocha Costa ◽  
Heber Carlos Ferreira ◽  
Gelmires Araújo Neves
Keyword(s):  
Comparative Study ◽  
Organic Compounds ◽  
Cation Exchange Capacity ◽  
Clay Fraction ◽  
Exchange Capacity ◽  
Ionic Surfactants ◽  
Ionic Surfactant ◽  
Organophilic Clays ◽  
Swelling Capacity ◽  
High Cation Exchange Capacity

The clays of the smectite group, mainly montmorillonite, are widely used in the production of organoclays due to the small dimensions of the crystals, high cation exchange capacity (CEC), and swelling capacity in water, which lead to a rapid and efficient intercalation of organic compounds used in the synthesis. In this context, this research was intended to make a comparative study of clays organofilized with ionic surfactants through their respective CEC. We selected four samples of bentonites, namely Chocolate (Boa Vista, PB), Brasgel (industrial), Dark Bentonite (Pedra Lavrada, PB) and M400 Bentonite (industrial). The natural samples were characterized through XRD, EDX, TA and GA, and the organofilized ones through XRD. The characterization tests showed that the samples are composed of clay minerals of the smectite group, the CEC values ​​were insignificant changes when comparing the values ​​of natural and activated clays with sodium carbonate. And the levels indicated by the CEC for the ionic surfactant Praepagem HY proved insufficient to transform the organophilic clays, as the nominees for the ionic surfactant Praepagem WB led to adequate results regarding the incorporation of the surfactant in the clay fraction of the studied samples.

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