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Dynamic perspective on the function of thermoresponsive nanopores from in situ AFM and ATR-IR investigations

This article describes the morphological and chemical characterization of stimuli-responsive functionalized silicon surfaces provided in parallel by atomic force spectroscopy (AFM) and Fourier transform infrared spectroscopy (FT-IR) enhanced by the single-beam sample reference attenuated total refle...

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Bibliographic Details
Main Authors: Popa, Ana Maria (Author) , Angeloni, Silvia (Author) , Bürgi, Thomas (Author) , Hubbell, Jeffrey A. (Author) , Heinzelmann, Harry (Author) , Pugin, Raphaël (Author)
Format: Article (Journal)
Language:English
Published: 7 September 2010
In: Langmuir
Year: 2010, Volume: 26, Issue: 19, Pages: 15356-15365
ISSN:1520-5827
DOI:10.1021/la102611k
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/la102611k
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Author Notes:Ana Maria Popa, Silvia Angeloni, Thomas Bürgi, Jeffrey A. Hubbell, Harry Heinzelmann, and Raphaël Pugin
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Summary:This article describes the morphological and chemical characterization of stimuli-responsive functionalized silicon surfaces provided in parallel by atomic force spectroscopy (AFM) and Fourier transform infrared spectroscopy (FT-IR) enhanced by the single-beam sample reference attenuated total reflection method (SBSR-ATR). The stimuli-responsive behavior of the surfaces was obtained by grafting-to in melt carboxyl-terminated poly-N-isopropylacryl amides (PNIPAAM) with different degree of polymerization (DP) on epoxide-functionalized silicon substrates. The unprecedented real time and in situ physicochemical insight into the temperature-triggered response of the densely packed superficial brushes allowed for the selection of a PNIPAAM with a specific DP as a suitable polymer for the fabrication of silicon membranes exhibiting switchable nanopores. The fabrication process combines the manufacture of nanoporous silicon surfaces and their subsequent chemical functionalization by the grafting-to in melt of the selected polymer. Then, relevant information was obtained in what concerns the chemical modifications behind the topographical changes that drive the functioning of PNIPAAM-based hybrid nanovalves as well as the timescale on which the opening and closing of the nanopores occur.
Item Description:Gesehen am 05.05.2023
Physical Description:Online Resource
ISSN:1520-5827
DOI:10.1021/la102611k

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