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@ARTICLE{Schmutzler:859465,
author = {Schmutzler, Tilo and Schindler, Torben and Schmiele, Martin
and Appavou, Marie-Sousai and Lages, Sebastian and Kriele,
Armin and Gilles, Ralph and Unruh, Tobias},
title = {{T}he influence of n- hexanol on the morphology and
composition of {CTAB} micelles},
journal = {Colloids and surfaces / A Physicochemical and engineering
aspects A},
volume = {543},
issn = {0927-7757},
address = {Amsterdam [u.a.]},
publisher = {Elsevier Science},
reportid = {FZJ-2019-00321},
pages = {56 - 63},
year = {2018},
abstract = {The effect of the addition of n-hexanol as co-surfactant on
the structure of cetyltrimethylammonium bromide (CTAB)
micelles has been studied using small-angle X-ray and
neutron scattering (SAXS, SANS). Contrast variation neutron
scattering experiments were performed to determine the
structure of both pure CTAB and n-hexanol modified CTAB
micelles. The incorporation of n-hexanol leads to an
elongation of the ellipsoidal CTAB micelles. The scattering
length density of the micellar shell linearly depends on the
degree of deuteration of the dispersion medium water and
revealed the existence of substantial amounts of water in
the micellar shell. The water content in the shell increased
from $20 vol-\%$ observed for pure CTAB micelles to
$44 vol-\%$ found for n-hexanol modified CTAB micelles.
The amount of n-hexanol in the micellar shell was determined
by varying the amount of fully deuterated and protonated
n-hexanol. These experiments revealed a volume fraction of
$26 vol-\%$ of n-hexanol molecules in the micellar core
which equals a molar fraction of $50 \%$ n-hexanol within
the CTAB micelles. The total composition of micellar core
and shell was estimated. The packing density of headgroups,
water molecules and bromide ions turned out to drastically
increase in n-hexanol modified CTAB micelles. These findings
contribute to a fundamental understanding of the
stabilization mechanism of micelles by alcoholic
co-surfactants and the resulting alteration of the
morphology and interface composition. These results will
facilitate the optimization of processes where CTAB and
other comparable surfactants are used as phase transfer
catalysts, structure directing agents or stabilizers in
colloidal dispersions or emulsions.},
cin = {JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6G15 - FRM II / MLZ (POF3-6G15)},
pid = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
experiment = {EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000426428500007},
doi = {10.1016/j.colsurfa.2017.12.039},
url = {https://juser.fz-juelich.de/record/859465},
}