Dynamics of Confined Short-Chain <i>alkanol</i> in <i>MCM-41</i> by Dielectric Spectroscopy: Effects of <i>matrix</i> and <i>system</i> Treatments and Filling Factor
oleh: Josef Bartoš, Silvia Arrese-Igor, Helena Švajdlenková, Angela Kleinová, Angel Alegría
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2020-03-01 |
Deskripsi
The dynamics of <i>n-propanol</i> confined in regular <i>MCM-41</i> <i>matrix</i> with the pore size <i>D</i><sub>pore</sub> = 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 <i>air</i> or <i>N<sub>2</sub></i> influence the BDS spectra of the empty <i>MCM-41</i> and the confined <i>n-PrOH/MCM-41 systems</i>, but have a little effect on the maximum relaxation time of the main process. Finally, various filling factors of <i>n-PrOH</i> <i>medium</i> in the optimally treated <i>MCM-41</i> <i>system</i> lead to unimodal or bimodal spectra interpreted in terms of the two <i>distinct</i> dynamic phases in the confined states.