TY  - JOUR
AU  - Michels, Rolf
AU  - Goerigk, Günter
AU  - Vainio, Ulla
AU  - Gummel, Jérémie
AU  - Huber, Klaus
TI  - Coaggregation of Two Anionic Azo Dyestuffs: A Combined Static Light Scattering and Small-Angle X-ray Scattering Study
JO  - The journal of physical chemistry  / B
VL  - 118
IS  - 27
SN  - 1520-6106
CY  - Washington, DC
PB  - Soc.
M1  - DESY-2014-03392
SP  - 7618 - 7629
PY  - 2014
AB  - The formation of azo dyestuff aggregates in dilute aqueous solution induced by the addition of Mg2+, Ca2+, Sr2+, or Ba2+ ions is followed by time-resolved static light scattering (SLS) and time-resolved small-angle X-ray scattering (SAXS). Time-dependent molar mass data of the growing aggregates is interpreted by means of a kinetic model introduced by Lomakin et al. ( Proc. Natl. Acad. Sci. U.S.A. 1996, 93, 1125) for the description of β-amyloid aggregation. This interpretation reveals significant trends within the homologous series of alkaline earth cations. The trends refer to the nucleation and the growth rate of the dyestuff fibers. Time-resolved SAXS experiments indicate that these first two stages are followed by a third one during which a network forms by partial lateral alignment of fibers. At high enough dyestuff concentrations, this network formation even leads to a gel-like phase. Anomalous SAXS (ASAXS) on such a gel phase formed upon the addition of Sr2+ revealed the extent of neutralization of the dyestuff molecules within the gel by the specifically interacting alkaline earth cations.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000338981200016
C6  - pmid:24937796
DO  - DOI:10.1021/jp502347b
UR  - https://bib-pubdb1.desy.de/record/171851
ER  -