PMID- 28481461
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20190121
LR  - 20190121
IS  - 1521-3773 (Electronic)
IS  - 1433-7851 (Linking)
VI  - 56
IP  - 24
DP  - 2017 Jun 6
TI  - Monitoring the Discontinuous Dodecamer-Icosamer Transition of a 
      Calix[4]arene-Derived Surfactant by Time-Resolved Small-Angle X-ray Scattering.
PG  - 6734-6738
LID - 10.1002/anie.201702260 [doi]
AB  - Calix[4]arene-derived surfactants form monodisperse micelles with a well-defined 
      aggregation number (N(agg) ) of 4, 6, 8, 12, or 20, corresponding to the Platonic 
      solids. This feature is in strong contrast to conventional micelles. In this 
      study, a transition from a dodecamer (N(agg) =12) to an icosamer (N(agg) =20) was 
      induced by a rapid increase in the NaCl concentration (C(NaCl) ) using a 
      stopped-flow device and directly observed by time-resolved small-angle X-ray 
      scattering. The N(agg) remained unchanged during the first 60 s after the 
      increase in C(NaCl)  , and then abruptly increased to 20. This feature resembles 
      phase transitions in supersaturated or supercooled states, or highly cooperative 
      phenomena. We surmise that this finding may be due to the fact that only a few 
      N(agg) values are thermodynamically allowed when N(agg) is sufficiently small. 
      This is the first observation of such an induction time in micellar aggregation.
CI  - (c) 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
FAU - Takahashi, Rintaro
AU  - Takahashi R
AUID- ORCID: 0000-0003-2168-9436
AD  - ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38043, Grenoble, France.
AD  - Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, 
      Wakamatsu-ku, Kitakyushu, Fukuoka, 808-0135, Japan.
FAU - Matsumoto, Sakiko
AU  - Matsumoto S
AD  - Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, 
      Wakamatsu-ku, Kitakyushu, Fukuoka, 808-0135, Japan.
FAU - Fujii, Shota
AU  - Fujii S
AD  - Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, 
      Wakamatsu-ku, Kitakyushu, Fukuoka, 808-0135, Japan.
FAU - Narayanan, Theyencheri
AU  - Narayanan T
AD  - ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38043, Grenoble, France.
FAU - Sakurai, Kazuo
AU  - Sakurai K
AD  - Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, 
      Wakamatsu-ku, Kitakyushu, Fukuoka, 808-0135, Japan.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20170508
PL  - Germany
TA  - Angew Chem Int Ed Engl
JT  - Angewandte Chemie (International ed. in English)
JID - 0370543
OTO - NOTNLM
OT  - aggregation
OT  - calixarenes
OT  - kinetics
OT  - micelles
OT  - nonequilibrium processes
EDAT- 2017/05/10 06:00
MHDA- 2017/05/10 06:01
CRDT- 2017/05/09 06:00
PHST- 2017/03/02 00:00 [received]
PHST- 2017/05/10 06:00 [pubmed]
PHST- 2017/05/10 06:01 [medline]
PHST- 2017/05/09 06:00 [entrez]
AID - 10.1002/anie.201702260 [doi]
PST - ppublish
SO  - Angew Chem Int Ed Engl. 2017 Jun 6;56(24):6734-6738. doi: 10.1002/anie.201702260. 
      Epub 2017 May 8.