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@ARTICLE{Kutz:808417,
author = {Kutz, Anne and Mariani, Giacomo and Gröhn, Franziska},
title = {{I}onic dye–surfactant nanoassemblies: interplay of
electrostatics, hydrophobic effect, and π–π stacking},
journal = {Colloid $\&$ polymer science},
volume = {294},
number = {3},
issn = {1435-1536},
address = {Berlin},
publisher = {Springer},
reportid = {FZJ-2016-02240},
pages = {591 - 606},
year = {2016},
abstract = {The interplay of several non-covalent interaction forces is
used as key to supramolecular structures. Combining cationic
alkyltrimethylammonium bromide surfactants and the divalent
anionic azo dye Acid Red 26 (Ar26) as small building blocks
in aqueous solution, electrostatic interactions of the
oppositely charged building blocks in combination with
hydrophobic effect and π–π interactions play a major
role in aggregate formation. Static and dynamic light
scattering and small-angle neutron scattering (SANS)
revealed different sizes of aggregates in the range of 2
nm ≤ R H ≤ 420 nm depending on surfactant
length, concentration and of dye to surfactant loading
ratio. A strong relationship of assembly size with
surfactant concentration has been found, where initial
surfactant monomers and micelles influence the aggregate
formation differently. The stability of dye–surfactant
aggregates which also shows a dependency on surfactant tail
length has been related to ζ-potential measurements.
Small-angle neutron scattering elucidated that
dye–surfactant aggregates possess cylindrical shapes with
different aspect ratios. UV/Vis spectroscopy gave
information on the dye–dye π–π stacking geometry and
extent, while the thermodynamic parameters for micellization
and dye–surfactant binding ΔH, ΔG, and ΔS as well as
stoichiometry and binding constant obtained by isothermal
titration calorimetry revealed insight into the interplay of
interactions.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218},
pnm = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
Neutron Research (JCNS) (POF3-623)},
pid = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
experiment = {EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000372259300012},
doi = {10.1007/s00396-015-3814-2},
url = {https://juser.fz-juelich.de/record/808417},
}