Change search
ReferencesLink to record
Permanent link

Direct link
Fast Diffusion-Limited Lyotropic Phase Transitions Studied in-situ Using Continuous Flow Microfluidics / Microfocus-SAXS
Show others and affiliations
2014 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 30, no 42, 12494-12502 p.Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014. Vol. 30, no 42, 12494-12502 p.
Keyword [en]
X-RAY-SCATTERING, BLOCK-COPOLYMERS, POLYMERS, STATE, CHIP
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-180263DOI: 10.1021/la502971mISI: 000347744100005ScopusID: 2-s2.0-84908343194OAI: oai:DiVA.org:kth-180263DiVA: diva2:891991
Funder
Knut and Alice Wallenberg Foundation
Note

QC 2016-01-18

Available from: 2016-01-08 Created: 2016-01-08 Last updated: 2016-01-18Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Yu, Shun
In the same journal
Langmuir
Physical Chemistry

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 10 hits
ReferencesLink to record
Permanent link

Direct link