Micelle size and shape of sodium dodecyl sulfate in concentrated NaCl solutions

Journal Article · Thu Apr 03 04:00:00 EST 1980 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100444a011· OSTI ID:6170756

Hayashi, S; Ikeda, S

Light scattering from aqueous solutions of sodium dodecyl sulfate has been measured in the presence of NaCl of different concentrations at different temperatures. In NaCl solutions more concentrated than 0.45 M, surfactant micelles formed at the critical micelle concentration further associate into large micelles with increasing surfactant concentration. In 0.60 and 0.80 m NaCl at 25 C, light scattering exhibits anomalous dissymmetry attributable to the formation of trace amounts of microgel particles. In 0.80 M NaCl at 35 C, light scattering is normal and gives the micelle aggregation number as high as 1410 at 1.10 x 10/sup -2/ g cm/sup -3/. The angular dependence indicates formation of a rodlike micelle having a length of 597 angstroms. It is concluded that sodium dodecyl sulfate forms spherical micelles at low NaCl concentrations (< 0.45 M), but it associates into rodlike micelles at high NaCl concentrations when its micelle concentration is high. 41 references.

• OSTI ID: 6170756
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 84:7; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling &amp; Production
AGGLOMERATION
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
CHLORIDES
CHLORINE COMPOUNDS
CONFIGURATION
CYLINDRICAL CONFIGURATION
DISPERSIONS
DISPLACEMENT FLUIDS
FLUIDS
HALIDES
HALOGEN COMPOUNDS
LIGHT SCATTERING
MICELLAR SYSTEMS
MIXTURES
OXYGEN COMPOUNDS
PARTICLES
QUANTITY RATIO
SCATTERING
SHAPE
SIZE
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM SULFATES
SOLUTIONS
SPHERICAL CONFIGURATION
SULFATES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE