TY  - JOUR
AU  - With, Sebastian
AU  - Trebbin, Martin
AU  - Bartz, Christian B. A.
AU  - Neuber, Christian
AU  - Dulle, Martin
AU  - Yu, Shun
AU  - Roth, Stephan
AU  - Schmidt, Hans-Werner
AU  - Foerster, Stephan
TI  - Fast Diffusion-Limited Lyotropic Phase Transitions Studied in Situ Using Continuous Flow Microfluidics/Microfocus-SAXS
JO  - Langmuir
VL  - 30
IS  - 42
SN  - 0743-7463
CY  - Washington, DC
PB  - ACS Publ.
M1  - PUBDB-2015-00195
SP  - 12494 - 12502
PY  - 2014
N1  - (c) American Chemical Society. Post referee full text in progress. Embargo 1 Jahr ab September 12, 2014.
AB  - Fast concentration-induced diffusion-limited lyotropic phase transitions can be studied in situ with millisecond time resolution using continuous flow microfluidics in combination with microfocus small-angle X-ray scattering. The method was applied to follow a classical selfassembly sequence where amphiphiles assemble into micelles, which subsequently assemble into an ordered lattice via a disorder/order transition. As a model system we selected the self-assembly of an amphiphilic block copolymer induced by the addition of a nonsolvent. Using microchannel hydrodynamic flow-focusing, large concentration gradients can be generated, leading to a deep quench from the miscible to the microphase-separated state. Within milliseconds the block copolymers assembly via a spinodal microphase separation into micelles, followed by a disorder/order transition into an FCC liquid-crystalline phase with late-stage domain growth and shear-induced domain orientation into a mesocrystal. A comparison with a slow macroscopic near-equilibrium kinetic experiment shows that the fast structural transitions follow a direct pathway to the equilibrium structure without the trapping of metastable states.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000347744100005
C6  - pmid:25216394
DO  - DOI:10.1021/la502971m
UR  - https://bib-pubdb1.desy.de/record/205635
ER  -