A viscometric study of tuning micellar morphology by organic additives |
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Authors: | Kabir-ud-Din Ziya Ahmad Khan Sanjeev Kumar Tanweer Ahmad |
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Institution: | (1) Department of Chemistry, Aligarh Muslim University, Aligarh, 202002, India;(2) Department of Chemistry, The M. S. University of Baroda, Vadodara, 390002, India |
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Abstract: | The micellar morphology in aqueous 0.2 M sodium dodecyl sulfate (SDS) solutions has been studied in the simultaneous presence
of organic salts (anilinium hydrochloride, AHC; ortho-toluidine hydrochloride, oTHC; para-toluidine hydrochloride, pTHC) and aliphatic alcohols (n-butanol, C4OH; n-pentanol, C5OH; n-hexanol, C6OH; n-heptanol, C7OH), aliphatic amines (n-butylamine, C4NH2; n-pentylamine, C5NH2; n-hexylamine, C6NH2; n-heptylamine, C7NH2), or hydrocarbons (n-hexane, C6H; n-heptane, C7H) by viscosity measurements under Newtonian flow conditions at 30 °C. Addition of alcohols and amines causes micellar growth
which is found to be dependent upon chain length of the additive and nature of organic salt counterion. It is observed that
amines are more effective in increasing the viscosity of the system if added in pure 0.2 M SDS solution, while SDS + pTHC system was found versatile when alcohols were added to this system. The increased viscosity or the micellar growth is
explained in terms of the site of solubilization of the respective additive and the interaction of the additive with micellar
surface and salt counterion present in the head group region. Hydrocarbons are nearly ineffective in inducing micellar growth
and can be used as ‘micellar destroyer’ for the grown micelles. The additives used are found effective in tuning the environment
of the micelle which is reflected in viscosity behavior. This work may find use in micellar ultrafiltration as well as in
mimicking the natural cell, which has several aspects common with the micelle. |
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Keywords: | Sodium dodecyl sulfate Micellar morphology Organic salts Viscosity |
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