Christina Geiger, Julija Reitenbach, Cristiane Henschel, Lucas Kreuzer, Tobias Widmann, Peixi Wang, Gaetano Mangiapia, Jean-François Moulin, Christine M. Papadakis, André Laschewsky, Peter Müller-Buschbaum
- To systematically add functionality to nanoscale polymer switches, an understanding of their responsive behavior is crucial. Herein, solvent vapor stimuli are applied to thin films of a diblock copolymer consisting of a short poly(methyl methacrylate) (PMMA) block and a long poly(N-isopropylmethacrylamide) (PNIPMAM) block for realizing ternary nanoswitches. Three significantly distinct film states are successfully implemented by the combination of amphiphilicity and co-nonsolvency effect. The exposure of the thin films to nitrogen, pure water vapor, and mixed water/acetone (90 vol%/10 vol%) vapor switches the films from a dried to a hydrated (solvated and swollen) and a water/acetone-exchanged (solvated and contracted) equilibrium state. These three states have distinctly different film thicknesses and solvent contents, which act as switch positions "off," "on," and "standby." For understanding the switching process, time-of-flight neutron reflectometry (ToF-NR) and spectral reflectance (SR) studies of the swelling and dehydrationTo systematically add functionality to nanoscale polymer switches, an understanding of their responsive behavior is crucial. Herein, solvent vapor stimuli are applied to thin films of a diblock copolymer consisting of a short poly(methyl methacrylate) (PMMA) block and a long poly(N-isopropylmethacrylamide) (PNIPMAM) block for realizing ternary nanoswitches. Three significantly distinct film states are successfully implemented by the combination of amphiphilicity and co-nonsolvency effect. The exposure of the thin films to nitrogen, pure water vapor, and mixed water/acetone (90 vol%/10 vol%) vapor switches the films from a dried to a hydrated (solvated and swollen) and a water/acetone-exchanged (solvated and contracted) equilibrium state. These three states have distinctly different film thicknesses and solvent contents, which act as switch positions "off," "on," and "standby." For understanding the switching process, time-of-flight neutron reflectometry (ToF-NR) and spectral reflectance (SR) studies of the swelling and dehydration process are complemented by information on the local solvation of functional groups probed with Fourier-transform infrared (FTIR) spectroscopy. An accelerated responsive behavior beyond a minimum hydration/solvation level is attributed to the fast build-up and depletion of the hydration shell of PNIPMAM, caused by its hydrophobic moieties promoting a cooperative hydration character.…
MetadatenAuthor details: | Christina GeigerORCiDGND, Julija ReitenbachORCiDGND, Cristiane HenschelORCiDGND, Lucas KreuzerORCiDGND, Tobias WidmannORCiDGND, Peixi Wang, Gaetano Mangiapia, Jean-François Moulin, Christine M. PapadakisORCiDGND, André LaschewskyORCiDGND, Peter Müller-BuschbaumORCiDGND |
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DOI: | https://doi.org/10.1002/adem.202100191 |
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ISSN: | 1438-1656 |
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ISSN: | 1527-2648 |
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Title of parent work (English): | Advanced engineering materials |
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Publisher: | Wiley-VCH |
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Place of publishing: | Weinheim |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2021/05/05 |
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Publication year: | 2021 |
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Release date: | 2024/05/13 |
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Tag: | co-nonsolvency; diblock copolymers; nanoswitches; neutron reflectometry; thin films |
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Volume: | 23 |
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Issue: | 11 |
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Article number: | 2100191 |
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Number of pages: | 12 |
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Funding institution: | Deutsche Forschungsgemeinschaft (DFG)German Research Foundation (DFG) [LA 611/16-1, MU 1487/29-1, PA 771/20-1]; German Ministry for Education and Research (BMBF) project "FlexiProb"Federal Ministry of Education & Research (BMBF) [05 K2016] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften |
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| 6 Technik, Medizin, angewandte Wissenschaften / 66 Chemische Verfahrenstechnik / 660 Chemische Verfahrenstechnik |
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Peer review: | Referiert |
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Publishing method: | Open Access / Hybrid Open-Access |
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License (German): | CC-BY-NC - Namensnennung, nicht kommerziell 4.0 International |
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