Molecular Dynamics of Tert-butyl Chloride Confined to CPG (7.4, 15.6 nm)

• Authors: L. Szutkowska , B. Peplińska , S. Jurga
• Languages of publication: EN

Abstracts

EN

The paper complements our earlier NMR investigation of molecular dynamics of tert-butyl chloride restricted by geometries of the type MCM-41 and CPG by the new sizes of CPG and by differential scanning calorimetry method. We report proton and deuteron NMR lineshapes and the spin-lattice relaxation results of tert-butyl chloride in CPG of the 15.6 nm and 7.4 nm pore diameter in the temperature range 70 K≤ T≤ 292 K. The bulk-like component of the confined tert-butyl chloride, in temperatures corresponding to phase III, is interpreted as a composition of two dynamically different subphases. The parameters of motions of both subphases are derived. The tert-butyl group motion in both subphases is more restricted than in the bulk tert-butyl chloride, although the activation energies are lower. Differential scanning calorimetry was used to determine temperatures of the phase transitions (140 K≤T≤292 K). The results show that the depression of the phase transition temperature is pore size dependent and that the confinement has less influence on transition to the plastic phase than on the freezing and on the solid II - solid III transition.

Keywords

EN

76.60.Es; 81.05.Rm; 33.15.Vb; 33.20.Bx; 68.35.Rh

Discipline

• 33.15.Vb: Correlation times in molecular dynamics
• 81.05.Rm: Porous materials; granular materials(for granular superconductors, see 74.81.Bd)
• 76.60.Es: Relaxation effects
• 68.35.Rh: Phase transitions and critical phenomena
• 33.20.Bx: Radio-frequency and microwave spectra

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 2
• Pages: 357-370

Dates

published

2005-08

received

2005-04-24

Contributors

author

L. Szutkowska

• Department of Macromolecular Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

B. Peplińska

• Department of Macromolecular Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

S. Jurga

• Department of Macromolecular Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

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Identifiers

DOI

10.12693/APhysPolA.108.357