Journal Article

PreJuSER-11979

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Polymer dynamics in nanochannels of porous silicon: A neutron spin echo study

Kusmin, A.FZJ* ; Gruener, S. ; Henschel, A. ; de Souza, N. R.FZJ* ; Allgaier, J.FZJ* ; Richter, D.FZJ* ; Huber, P.

2010
Soc. Washington, DC

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Please use a persistent id in citations: doi:10.1021/ma1004925

Abstract: Neutron spin echo spectra of poly(ethylene oxide) (PEO) melts confined in porous silicon (the mean pore diameter: 13 nm) were recorded at Q = 0.05, 0.08, and 0.11 angstrom(-1) and successfully analyzed in terms of a two-state model, where chains adsorbed to the pore walls exhibit much slower internal dynamics than in the bulk and their centers-of-mass do not move, while free chains have hulk like internal dynamics and diffuse within an infinite cylinder in the center of the pore. The radius of this cylinder was found to be 1.4 nm for PE:0 3 kg/mol (3k); this corresponds to the thickness Idle adsorbed layer to be approximately equal to the Flory radius. As opposed to PEO 10k, for which details on the center of mass diffusion could not he discerned, for PEO 3k the diffusion rate along the pore was found to he smaller than that in the radial direction.

Keyword(s): J

Note: A.K. thanks O. Holderer and M. Monken-busch for the help with getting familiar with NSE in general and J-NSE in particular. This work has been supported by the German Research Foundation (DFG) within the priority program SP 1164, Nano- and Microfluidies, Grant No. Hu 850/2.

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Contributing Institute(s):

1. Neutronenstreuung (IFF-5)
2. Streumethoden (IFF-4)
3. JCNS (Jülich Centre for Neutron Science JCNS (JCNS) ; JCNS)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Experiment(s):

1. J-NSE: Neutron spin-echo spectrometer (NL2ao)

Appears in the scientific report 2010

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