Scattering study of mixed micelles of hexaethylene glycol mono-n-dodecyl ether and sodium dodecylsulfonate in D[sub 2]O

Journal Article · Thu Mar 31 23:00:00 EST 1994 · Langmuir; (United States)

DOI:https://doi.org/10.1021/la00016a020· OSTI ID:7267406

Douglas, C B; Kaler, E W ^[1]

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1. Univ. of Delaware, Newark, DE (United States)

Small angle neutron scattering and light scattering measurements have been used to probe interactions between mixed micelles composed primarily of hexaethylene glycol mono-n-dodecyl ether, C[sub 12]E[sub 6], with small amounts of added sodium dodecylsulfonate, C[sub 12]SO[sub 3]Na, in D[sub 2]O. The phase behavior of these two surfactants in D[sub 2]O varies little from their phase behavior in H[sub 2]O. As the ratio of anionic to nonionic surfactant increases at fixed nonionic surfactant concentration, static light scattering spectra from micellar solutions show growing evidence of an interaction peak that correlates with expected increases in electrostatic repulsions. Dynamic light scattering results are also consistent with an increase in the repulsive interactions between micelles as the amount of added C[sub 12]SO[sub 3]Na increases. Small angle neutron scattering spectra are used to test models of micelle interactions. A model incorporating an electrostatic perturbation to the sticky hard sphere model provides excellent fits to spectra from mixed micellar solutions. The size of the micelle remains constant with added anionic surfactant, and the charge per micelle increases steadily. Thus, the effect of adding anionic surfactant to aqueous micellar solutions of C[sub 12]E[sub 6] can be understood simply in terms of a strengthening repulsive electrostatic component of the micelle-micelle interaction potential that counteracts an attractive potential between C[sub 12]E[sub 6] micelles. 49 refs., 7 figs., 2 tabs.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7267406
• Journal Information: Langmuir; (United States), Journal Name: Langmuir; (United States) Vol. 10:4; ISSN LANGD5; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
COMPILED DATA
DATA
ELECTROSTATICS
ETHERS
HEAVY WATER
HYDROGEN COMPOUNDS
INFORMATION
LIGHT SCATTERING
MATHEMATICAL MODELS
MICELLAR SYSTEMS
NEUTRON PROBES
NEUTRON SPECTRA
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PHASE STUDIES
PROBES
SCATTERING
SPECTRA
SULFONATES
SURFACTANTS
WATER