This title appears in the Scientific Report :
2022
Please use the identifier:
http://dx.doi.org/10.1039/D2SM01021F in citations.
Please use the identifier: http://hdl.handle.net/2128/33114 in citations.
Structure formation of PNIPAM microgels in foams and foam films
Structure formation of PNIPAM microgels in foams and foam films
Responsive aqueous foams are very interesting from a fundamental point of view and for various applications like foam flooding or foam flotation. In this study thermoresponsive microgels (MGs) made from poly(N-isopropyl-acrylamide) (PNIPAM) with varying cross-linker content, are used as foam stabili...
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Personal Name(s): | Kühnhammer, Matthias (Corresponding author) |
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Gräff, Kevin / Loran, Edwin / Soltwedel, Olaf / Löhmann, Oliver / Frielinghaus, Henrich / von Klitzing, Regine | |
Contributing Institute: |
Heinz Maier-Leibnitz Zentrum; MLZ JCNS-4; JCNS-4 Neutronenstreuung; JCNS-1 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Soft matter, 18 (2022) 48, S. 9249-9262 |
Imprint: |
London
Royal Soc. of Chemistry
2022
|
DOI: |
10.1039/D2SM01021F |
Document Type: |
Journal Article |
Research Program: |
Materials – Quantum, Complex and Functional Materials Jülich Centre for Neutron Research (JCNS) (FZJ) |
Subject (ZB): | |
Link: |
Get full text Published on 2022-10-19. Available in OpenAccess from 2023-10-19. Published on 2022-10-19. Available in OpenAccess from 2023-10-19. |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/33114 in citations.
Responsive aqueous foams are very interesting from a fundamental point of view and for various applications like foam flooding or foam flotation. In this study thermoresponsive microgels (MGs) made from poly(N-isopropyl-acrylamide) (PNIPAM) with varying cross-linker content, are used as foam stabilisers. The foams obtained are thermoresponsive and can be destabilised by increasing the temperature. The structuring of MGs inside the foam films is investigated with small-angle neutron scattering and in a thin film pressure balance. The foam films are inhomogeneous and form a network-like structure, in which thin and MG depleted zones with a thickness of ca. 30nm are interspersed in a continuous network of thick MG containing areas with a thickness of several 100nm. The thickness of this continuous network is related to the elastic modulus of the individual MGs, which was determined by atomic force microscopy indentation experiments. Both, the elastic moduli and foam film thicknesses, indicate a correlation to the network elasticity of the MGs predicted by the affine network model. |