Monitoring structural changes of liquids frozen in nanopores

C. Choi, M. M. Pintar, J. Peternelj, A. Krainer

Research output: Contribution to journalArticle

Abstract

Less dense packing of molecules in frozen liquids confined to cylindrical glass pores was observed to depend on pore size. This conclusion was derived by monitoring the rotational tunneling of methyl protons, which reside on studied molecules, with nuclear magnetic resonance. For example, the tunneling frequency of dimethyl sulfide and propionic acid at 10 K was observed to be larger in pores than in bulk. This is interpreted as being due to a decrease in the hindering potential. In another type of tunneling spectrum which is due to methyl-methyl interaction, observed in acetyl acetone at 10 K, the splitting decreases as the pores become smaller. It is demonstrated that in both types of materials the shifts of the methyl tunneling splittings in pores are the result of the reduced intermolecular interaction in the pore core region. This in turn indicates that the unit cell size of liquids frozen in nanopores is slightly increased. The increase is largest in smallest pores.

Original languageEnglish (US)
Article number5
Pages (from-to)11227-11231
Number of pages5
JournalJournal of Chemical Physics
Volume121
Issue number22
DOIs
StatePublished - Dec 8 2004

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Nanopores
porosity
Molecules
Monitoring
Liquids
liquids
Acetone
Pore size
Protons
Nuclear magnetic resonance
Glass
propionic acid
acetone
sulfides
molecules
interactions
nuclear magnetic resonance
acids
protons
glass

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Monitoring structural changes of liquids frozen in nanopores. / Choi, C.; Pintar, M. M.; Peternelj, J.; Krainer, A.

In: Journal of Chemical Physics, Vol. 121, No. 22, 5, 08.12.2004, p. 11227-11231.

Research output: Contribution to journalArticle

Choi, C, Pintar, MM, Peternelj, J & Krainer, A 2004, 'Monitoring structural changes of liquids frozen in nanopores', Journal of Chemical Physics, vol. 121, no. 22, 5, pp. 11227-11231. https://doi.org/10.1063/1.1817944
Choi, C. ; Pintar, M. M. ; Peternelj, J. ; Krainer, A. / Monitoring structural changes of liquids frozen in nanopores. In: Journal of Chemical Physics. 2004 ; Vol. 121, No. 22. pp. 11227-11231.
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