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Portrait of Jonas Tegenfeldt. Photo: Kennet Ruona

Jonas Tegenfeldt

Professor, Coordinator Nanobiology & Neuronanoscience

Portrait of Jonas Tegenfeldt. Photo: Kennet Ruona

Preparation of colloidal molecules with temperature-tunable interactions from oppositely charged microgel spheres

Author

  • Linda K. Månsson
  • Tym De Wild
  • Feifei Peng
  • Stefan H. Holm
  • Jonas O. Tegenfeldt
  • Peter Schurtenberger

Summary, in English

The self-assembly of small colloidal clusters, so-called colloidal molecules, into crystalline materials has proven extremely challenging, the outcome often being glassy, amorphous states where positions and orientations are locked. In this paper, a new type of colloidal molecule is therefore prepared, assembled from poly(N-isopropylacrylamide) (PNIPAM)-based microgels that due to their well documented softness and temperature-response allow for greater defect tolerance compared to hard spheres and for convenient in situ tuning of size, volume fraction and inter-particle interactions with temperature. The microgels (B) are assembled by electrostatic adsorption onto oppositely charged, smaller-sized microgels (A), where the relative size of the two determines the valency (n) of the resulting core-satellite ABn-type colloidal molecules. Following assembly, a microfluidic deterministic lateral displacement (DLD) device is used to effectively isolate AB4-type colloidal molecules of tetrahedral geometry that possess a repulsive-to-attractive transition on crossing the microgels' volume phase transition temperature (VPTT). These soft, temperature-responsive colloidal molecules constitute highly promising building blocks for the preparation of new materials with emergent properties, and their optical wavelength-size makes them especially interesting for optical applications.

Department/s

  • NanoLund
  • Physical Chemistry
  • Solid State Physics
  • LINXS - Lund Institute of advanced Neutron and X-ray Science

Publishing year

2019-11

Language

English

Pages

8512-8524

Publication/Series

Soft Matter

Volume

15

Issue

42

Document type

Journal article

Publisher

Royal Society of Chemistry

Topic

  • Condensed Matter Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1744-683X