Hydration and Solvent Exchange Induced Swelling and Deswelling of Homogeneous Poly(N-isopropylacrylamide) Microgel Thin Films

Widmann T, Kreuzer LP, Hohn N, Biessmann L, Wang K, Rinner S, Moulin J-F, Schmid AJ, Hannappel Y, Wrede O, Kuehnhammer M, et al. (2019)
LANGMUIR 35(49): 16341-16352.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Widmann, Tobias; Kreuzer, Lucas P.; Hohn, Nuri; Biessmann, Lorenz; Wang, Kun; Rinner, Stephan; Moulin, Jean-Francois; Schmid, Andreas JosefUniBi; Hannappel, YvonneUniBi; Wrede, OliverUniBi; Kuehnhammer, Matthias; Hellweg, ThomasUniBi
Alle
Abstract / Bemerkung
The investigation of the response kinetics of smart colloidal microgel films is crucial for their optimization to enable advanced applications. We study the classical thermoresponsive microgel model system N-isopropylacrylamide cross-linked with N,N'-methylenebisacrylamide. Without the typically used polyelectrolyte coating of the substrate, thin microgel films are prepared in a single spin-coating step. Atomic force microscopy measurements reveal an extremely dense packing, resulting in a homogeneous compact thin film of microgel particles. The hydration kinetics of these films in H2O and D2O atmospheres as well as the kinetics of the solvent exchange between both water species are investigated with in situ time-of-flight neutron reflectometry (TOF-NR) and in situ Fourier-transform infrared (FTIR) spectroscopy. With accounting for a nonconstant humid atmosphere, the intrinsic diffusion dynamics of water molecules into the thin microgel film are modeled and the specific time constant tau and the effective Flory-Huggins interaction parameter chi(eff) are determined. Comparing the results in H2O and D2O atmospheres, TOF-NR and FTIR spectroscopy results show an increased affinity of the microgel films toward H2O as compared to D2O. From the FTIR spectroscopy data, we further identify different kinetics of intermolecular processes and order them according to their temporal evolution.
Erscheinungsjahr
2019
Zeitschriftentitel
LANGMUIR
Band
35
Ausgabe
49
Seite(n)
16341-16352
ISSN
0743-7463
Page URI
https://pub.uni-bielefeld.de/record/2939936

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Widmann T, Kreuzer LP, Hohn N, et al. Hydration and Solvent Exchange Induced Swelling and Deswelling of Homogeneous Poly(N-isopropylacrylamide) Microgel Thin Films. LANGMUIR. 2019;35(49):16341-16352.
Widmann, T., Kreuzer, L. P., Hohn, N., Biessmann, L., Wang, K., Rinner, S., Moulin, J. - F., et al. (2019). Hydration and Solvent Exchange Induced Swelling and Deswelling of Homogeneous Poly(N-isopropylacrylamide) Microgel Thin Films. LANGMUIR, 35(49), 16341-16352. doi:10.1021/acs.langmuir.9b03104
Widmann, T., Kreuzer, L. P., Hohn, N., Biessmann, L., Wang, K., Rinner, S., Moulin, J. - F., Schmid, A. J., Hannappel, Y., Wrede, O., et al. (2019). Hydration and Solvent Exchange Induced Swelling and Deswelling of Homogeneous Poly(N-isopropylacrylamide) Microgel Thin Films. LANGMUIR 35, 16341-16352.
Widmann, T., et al., 2019. Hydration and Solvent Exchange Induced Swelling and Deswelling of Homogeneous Poly(N-isopropylacrylamide) Microgel Thin Films. LANGMUIR, 35(49), p 16341-16352.
T. Widmann, et al., “Hydration and Solvent Exchange Induced Swelling and Deswelling of Homogeneous Poly(N-isopropylacrylamide) Microgel Thin Films”, LANGMUIR, vol. 35, 2019, pp. 16341-16352.
Widmann, T., Kreuzer, L.P., Hohn, N., Biessmann, L., Wang, K., Rinner, S., Moulin, J.-F., Schmid, A.J., Hannappel, Y., Wrede, O., Kuehnhammer, M., Hellweg, T., von Klitzing, R., Mueller-Buschbaum, P.: Hydration and Solvent Exchange Induced Swelling and Deswelling of Homogeneous Poly(N-isopropylacrylamide) Microgel Thin Films. LANGMUIR. 35, 16341-16352 (2019).
Widmann, Tobias, Kreuzer, Lucas P., Hohn, Nuri, Biessmann, Lorenz, Wang, Kun, Rinner, Stephan, Moulin, Jean-Francois, Schmid, Andreas Josef, Hannappel, Yvonne, Wrede, Oliver, Kuehnhammer, Matthias, Hellweg, Thomas, von Klitzing, Regine, and Mueller-Buschbaum, Peter. “Hydration and Solvent Exchange Induced Swelling and Deswelling of Homogeneous Poly(N-isopropylacrylamide) Microgel Thin Films”. LANGMUIR 35.49 (2019): 16341-16352.

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