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Structural transformations of even-numbered n-alkanes confined in mesopores
Publikationstyp
Journal Article
Date Issued
2006-09-27
Sprache
English
Author(s)
Volume
74
Issue
3
Article Number
031610
Citation
Phys. Rev. E 74 (3): 031610 (2006-10-02)
Publisher DOI
ArXiv ID
Publisher
American Physical Society
The n-alkanes C12H26, C14H30, and C16H34 have been imbibed and solidified in mesoporous Vycor glass with a mean pore diameter of 10nm. The samples have been investigated by x-ray diffractometry and calorimetric measurements. The structures and phase sequences have been determined. Apart from a reduction and the hysteresis of the melting/freezing transition, pore confined C12 reproduces the liquid-triclinic phase sequence of the bulk material, but for C16 an orthorhombic rotator mesophase appears that in the bulk state is absent for C16 but well known from odd numbered alkanes of similar length. In pore confined C14 this phase shows up on cooling but not on heating.
Subjects
Soft Condensed Matter
Materials Science
DDC Class
530: Physik