The effect of medium chain length alcohols on the micellar properties of sodium dodecyl sulfate in sodium chloride solutions

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Journal of Colloid and Interface Science; (United States)

DOI:https://doi.org/10.1006/jcis.1994.1154· OSTI ID:7207400

Foerland, G M; Hoeiland, H ^[1]; Samseth, J ^[2]; Mortensen, K ^[3]

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1. Bergen Univ. (Norway). Dept. of Chemistry
2. Institute for Energy Technology, Kjeller (Norway)
3. Risoe National Lab., Roskilde (Denmark)

The effect of medium chain length alcohols on the micellar size and shape of sodium dodecyl sulfate in electrolyte solutions has been investigated by means of small angle neutron scattering (SANS), dynamic light scattering (DLS), and viscosity measurements. The surfactant content was kept constant throughout, at 0.04 m, and the alcohols used were 1-butanol, 1-pentanol, and 1-hexanol. The data from the various techniques are qualitatively in agreement. The SANS data generally fit a model for prolate ellipsoids with varying ratios of the major to minor axis. Addition of butanol first leads to a decrease in micellar size, the major to minor axis ratio decreases from about 6 to less than 2. However, as the butanol concentration exceeds 0.5 m, the micelles starts to grow again. The same can be seen from the diffusion coefficient as measured by DLS. Addition of pentanol or hexanol do not bring about this minimum in micellar size. The minor axis decreases and the major axis increases as these alcohols are added. Thus these alcohols make the prolate ellipsoidal micelles grow continuously towards large rod-like structures. The viscosity data are less detailed, but confirm the general trend upon alcohol addition.

• OSTI ID: 7207400
• Journal Information: Journal of Colloid and Interface Science; (United States), Journal Name: Journal of Colloid and Interface Science; (United States) Vol. 164:1; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
ALKALI METAL COMPOUNDS
BUTANOLS
CATALYTIC EFFECTS
CONCENTRATION RATIO
HEXANOLS
HYDROXY COMPOUNDS
MICELLAR SYSTEMS
MORPHOLOGY
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PARTICLE SIZE
PENTANOLS
SIZE
SODIUM COMPOUNDS
SODIUM SULFATES
SOLUBILITY
SULFATES
SULFUR COMPOUNDS