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Fast Diffusion-Limited Lyotropic Phase Transitions Studied in-situ Using Continuous Flow Microfluidics / Microfocus-SAXS
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2014 (Engelska)Ingår i: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 30, nr 42, s. 12494-12502Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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 self-assembly 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.

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2014. Vol. 30, nr 42, s. 12494-12502
Nyckelord [en]
X-RAY-SCATTERING, BLOCK-COPOLYMERS, POLYMERS, STATE, CHIP
Nationell ämneskategori
Fysikalisk kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-180263DOI: 10.1021/la502971mISI: 000347744100005Scopus ID: 2-s2.0-84908343194OAI: oai:DiVA.org:kth-180263DiVA, id: diva2:891991
Forskningsfinansiär
Knut och Alice Wallenbergs Stiftelse
Anmärkning

QC 2016-01-18

Tillgänglig från: 2016-01-08 Skapad: 2016-01-08 Senast uppdaterad: 2017-12-01Bibliografiskt granskad

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Yu, Shun

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