Dynamics of Confined Short-Chain alkanol in MCM-41 by Dielectric Spectroscopy: Effects of matrix and system Treatments and Filling Factor

Polymers
Josef BartošAngel Alegría

Abstract

The dynamics of n-propanol confined in regular MCM-41matrix with the pore size Dpore = 40 Å, under various matrix conditioning and sample confining conditions, using broadband dielectric spectroscopy (BDS), is reported. First, various drying procedures with the capacitor filling under air or N2 influence the BDS spectra of the empty MCM-41 and the confined n-PrOH/MCM-41 systems, but have a little effect on the maximum relaxation time of the main process. Finally, various filling factors of n-PrOHmedium in the optimally treated MCM-41system lead to unimodal or bimodal spectra interpreted in terms of the two distinct dynamic phases in the confined states.

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Methods Mentioned

BETA
nuclear magnetic resonance
X-ray
neutron diffraction
thermal treatments

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