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Journal of Chemistry
Volume 2013, Article ID 476236, 7 pages
Research Article

Phase Behavior of Undecane-Dodecane Mixtures Confined in SBA-15

1College of Chemistry and Materials Science, Shandong Agricultural University, Shandong, Taian 271018, China
2Binzhou Medical College, Shandong, Yantai 264003, China

Received 23 June 2012; Revised 20 July 2012; Accepted 30 July 2012

Academic Editor: Nianjun Yang

Copyright © 2013 Xiao Yan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Phase behavior of undecane-dodecane mixtures (n-C11H24-C12H26, C11-C12) in bulk and confined in SBA-15 (pore diameters 3.8, 7.8, and 17.2 nm) has been studied by differential scanning calorimetry. Phase diagram of the confined C11-C12 system shows dependence on pore size, indicating simple behavior compared with the bulk. In the three systems, melting points of the confined C11, C12 and the mixtures (𝑥C12 = 0.1–0.9) present a linear relation with the pore diameter from 3.8 to 17.2 nm. Melting behavior of the confined C11-C12 mixtures is closely as the confined C11, C12. Melting temperatures of the three systems have been fitted as a function of mole fraction 𝑥C12.