%0 Journal Article
%A With, Sebastian
%A Trebbin, Martin
%A Bartz, Christian B. A.
%A Neuber, Christian
%A Dulle, Martin
%A Yu, Shun
%A Roth, Stephan
%A Schmidt, Hans-Werner
%A Foerster, Stephan
%T Fast Diffusion-Limited Lyotropic Phase Transitions Studied in Situ Using Continuous Flow Microfluidics/Microfocus-SAXS
%J Langmuir
%V 30
%N 42
%@ 0743-7463
%C Washington, DC
%I ACS Publ.
%M PUBDB-2015-00195
%P 12494 - 12502
%D 2014
%Z (c) American Chemical Society. Post referee full text in progress. Embargo 1 Jahr ab September 12, 2014.
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000347744100005
%$ pmid:25216394
%R 10.1021/la502971m
%U https://bib-pubdb1.desy.de/record/205635