Sauradip Chaudhuri - Impact of Nearly Water-insoluble Additives on the Properties of Vesicular Suspensions

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      Publication Details (including relevant citation   information):

         Department     of Chemical Engineering, University of Rhode Island, Kingston,     Rhode Island 02881, United     States 
         Department     of Chemistry, University of     Rhode Island, Kingston, Rhode Island     02881, United States 
        § School     of Engineering, Brown     University, Providence, Rhode Island     02906, United States 
         Research     and Development, Procter &     Gamble, Cincinnati, Ohio 45202, United States 
    Ind. Eng. Chem. Res.201756 (4),   pp 899–906
      DOI: 10.1021/acs.iecr.6b03821
      Publication Date (Web): January 5, 2017


        Nearly water-insoluble additives are commonly used in   surfactant-based consumer products to enhance their appeal or   performance. We used viscosity measurements, time-resolved   cryogenic transmission electron microscopy, and NMR spectroscopy   to investigate the effect of several additives, linalyl acetate   (LA), cyclohexanol, phenol, catechol, guaiacol, and eugenol, that   have extremely low water solubility, on the evolution of   microstructures in an aqueous multilamellar vesicle suspension of   diethylester dimethylammonium chloride (DEEDMAC), a major   ingredient in fabric softeners. LA and eugenol are used as   fragrances in some detergent-related consumer products. The other   additives were chosen to have degrees of aromaticity that are   intermediate between LA and eugenol. The viscosity of the DEEDMAC   suspension increased only marginally upon addition of LA, while   it rose significantly upon addition of eugenol. Cryo-TEM revealed   no observable changes to the multilamellar structures in the   DEEDMAC suspension when LA was added. The addition of eugenol   triggers a transition from multilamellar vesicles to   predominantly unilamellar vesicles and bilayer fragments through   exfoliation and breakage. By examining NMR results from all the   additives, we propose that π electrons in aromatic rings interact   strongly with the cationic DEEDMAC head groups. Such interactions   are strong in eugenol but not present in LA.

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