title: Effect of dl-homocysteic acid on W/O microemulsions of potassium naphthenate/1-octanol-n-heptane.
abstract: The effect of DL-homocysteic acid (DL-2-amino-4-sulfonobutyric acid) on W/O microemulsion of potassium naphthenate (80%) and naphthenic acid (20%) in mixed solvent (1-octanol and n-heptane) has been found in four phases: (1) Interaction between the amino acid molecules and the polar head groups of the surfactant through hydrogen bonding enhances solubilization in the aqueous cores. (2) The interaction results in the growth of the microemulsion droplets and the homogenization of the particle size distribution. (3) The microstructure of the solubilized water remains unchanged, except that the polarity of the interface is affected. (4) The transition point is reduced to lower water content. A possible mechanism is proposed.
authors.affiliation: The State Key Laboratory of Rare Earth Materials Chemistry and Applications, Department of Chemical Biology, College of Chemistry, Peking University, Beijing 100871, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Zhang
authors.forename: Nai Fu
authors.initials: NF
authors.lastname: Zhou
authors.forename: Yunlan
authors.initials: Y
authors.lastname: Su
authors.forename: Jinguang
authors.initials: J
authors.lastname: Wu
mesh_terms: D000596:Amino Acids / Q000737:chemistry; D004655:Emulsions; D006536:Heptanes / Q000737:chemistry*; D006710:Homocysteine / Q000031:analogs & derivatives* / Q000737:chemistry; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D008823:Micelles; D008956:Models, Chemical; D009280:Naphthaleneacetic Acids / Q000737:chemistry*; D000442:Octanols / Q000737:chemistry*; D017785:Photons; D012995:Solubility; D012997:Solvents; D013053:Spectrophotometry; D017550:Spectroscopy, Fourier Transform Infrared; D013501:Surface-Active Agents; D014867:Water / Q000737:chemistry
chemical_list: D000596:Amino Acids; D004655:Emulsions; D006536:Heptanes; D008823:Micelles; D009280:Naphthaleneacetic Acids; D000442:Octanols; D012997:Solvents; D013501:Surface-Active Agents; D014867:Water; D006710:Homocysteine; C007956:homocysteic acid; C034182:1-naphthaleneacetic acid