ISSN:
1435-1536
Keywords:
Adsorption of mixed surfactants
;
mixed adsorbed layer
;
spectroscopic probes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The adsorption of hexadecyl trimethylammonium bromide (HDTAB) and nonylphenyl polyglycol ether (NP20) from mixed aqueous solutions on silica has been investigated. The adsorption from mixed solutions is enhanced at low concentration, but is decreased at high concentration compared with those of the single surfactants. Further, measurements of fluorescence spectra of pyrene-3-carboxaldehyde and of ESR spectra of 2,2,6,6-tetramethylpiperidinyl-1-oxy in the surfactant adsorbed layer indicate that the micropolarity of the adsorbed layer is affected by feed mole fraction of HDTAB, in particular over the range of 0.3–0.7, while the microviscosity of the adsorbed layer is almost constant in the same range at a high feed concentration. This suggests that over the same range, the ratio of HDTAB/NP20 at the second layer is almost the same.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00652536
