Journal Article

PUBDB-2015-00195

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fast Diffusion-Limited Lyotropic Phase Transitions Studied in Situ Using Continuous Flow Microfluidics/Microfocus-SAXS

With, S.>Extern* ; Trebbin, M.DESY* ; Bartz, C. B. A. ; Neuber, C. ; Dulle, M. ; Yu, S.>Extern* ; Roth, S.DESY* ; Schmidt, H.-W. ; Foerster, S. (Corresponding Author)>Extern*

2014
ACS Publ. Washington, DC

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Please use a persistent id in citations: doi:10.1021/la502971m

Abstract: 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.

Note: (c) American Chemical Society. Post referee full text in progress. Embargo 1 Jahr ab September 12, 2014.

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Contributing Institute(s):

1. DOOR-User (DOOR)

Research Program(s):

1. PETRA Beamline P03 (POF2-54G14) (POF2-54G14)
2. STREAM - Structural evolution at the nano- and mesoscale (291211) (291211)

Experiment(s):

1. PETRA Beamline P03 (PETRA III)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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