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

Journal Article · Thu Apr 03 00:00:00 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), Vol. 84:7
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
MICELLAR SYSTEMS
PARTICLES
SODIUM SULFATES
AGGLOMERATION
AQUEOUS SOLUTIONS
CYLINDRICAL CONFIGURATION
DISPLACEMENT FLUIDS
LIGHT SCATTERING
QUANTITY RATIO
SHAPE
SIZE
SODIUM CHLORIDES
SPHERICAL CONFIGURATION
TEMPERATURE DEPENDENCE
ALKALI METAL COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
CONFIGURATION
DISPERSIONS
FLUIDS
HALIDES
HALOGEN COMPOUNDS
MIXTURES
OXYGEN COMPOUNDS
SCATTERING
SODIUM COMPOUNDS
SOLUTIONS
SULFATES
SULFUR COMPOUNDS
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