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    Emulsification, solubilization, and detergency behaviors of homogeneous polyoxypropylene-polyoxyethylene alkyl ether type nonionic surfactants

    Year: 2019

    Journal: Colloid Surf. A-Physicochem. Eng. Asp., Volume 564, MAR 5, page 51–58

    Authors: Yada, Shiho; Matsuoka, Keisuke; Kanasaki, Yu Nagai; Gotoh, Keiko; Yoshimura, Tomokazu

    Organizations: JSPS KAKENHIMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of ScienceGrants-in-Aid for Scientific Research (KAKENHI) [26410194, C12EO8]

    Keywords: Nonionic surfactant; Homogeneous polyoxypropylene-polyoxyethylene chain; Emulsification; Solubilization; Detergency

    The emulsification and solubilization properties and detergency behaviors were investigated using homogeneous polyoxypropylene-polyoxyethylene (PO-EO) alkyl ether type nonionic surfactants (C12EOxPO3, where x represents EO chain lengths of 6 and 8, and C-12 and PO3 indicate the dodecyl chain and single trioxypropylene chain, respectively) and polyoxyethylene (EO) alkyl ether type nonionic surfactants (C12EOx x = 6 and 8). These nonionic surfactants possess single EO and PO chain lengths without a distribution. An oil-in-water (O/W) type emulsion prepared using mixtures of nonionic surfactant C12EOxPO3 or C12EOx solutions and squalane was shown to be stable in the order of C12EO6PO3 < < C12EO6 < C12EO8PO3 < C12EO8. The introduction of a PO chain to the terminal hydroxy group of the EO chain lowers the emulsion stability owing to the difficult orientation of a complex structure such as the hydrophobic alkyl chain-hydrophilic EO chain-hydrophobic PO chain at the water/oil interface. The solubilization of these nonionic surfactants was shown to be higher for stearic acid than for naphthalene as a solubilizate. The molar solubilization ratio (MSR) for naphthalene and stearic acid was the highest for C12EO6PO3 and C12EO8PO3, respectively. The removal of stearic acid from a gold substrate evaluated using a quartz crystal microbalance (detergency) was the highest for C12EO6PO3 among the four surfactants applied. Thus, no significant correlation was found among the emulsification, solubilization, and detergency behaviors ; however, a high performance for each objective was obtained by controlling both the EO chain length and the introduction of a PO chain.
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