Quenching of lamellar ordering in an n-alkane embedded in nanopores

Details Quenching of lamellar ordering in an n-alkane embedded in nanopores Quenching of lamellar ordering in an n-alkane embedded in nanopores

2004-02-05

arxiv.org/abs/cond-mat/0402156v1

Europhysics Letters 65 (3), pp. 351-357 (2004)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 3 figures

Scientific paper

10.1209/epl/i2003-10088-0

We present an X-ray diffraction study of the normale alkane nonadecane C_{19}H_{40} embedded in nanoporous Vycor glass. The confined molecular crystal accomplishes a close-packed structure by alignment of the rod-like molecules parallel to the pore axis while sacrificing one basic principle known from the bulk state, i.e. the lamellar ordering of the molecules. Despite this disorder, the phase transitions observed in the confined solid mimic the phase behavior of the 3D unconfined crystal, though enriched by the appearance of a true rotator phase known only from longer alkane chains.

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