Snapshots of final configurations after 700 ps at T = 100K for 10% (top, left to right) propane, pentane, heptane, (bottom, left to right) nonane, and undecane impurities in a hexane monolayer on graphite. Hexane molecules are colored red and blue, and impurity molecules yellow and blue.

Atomic height as a function of impurity chain length at T = 110K for 3%, 5%, 10%, and 15% impurity compositions. The plot for each impurity type and composition corresponds to primarily 3 peaks, the first peak and corresponding shoulder (from the left) corresponds to the monolayer height of the molecules when they are flat (first peak) and rolled normal to the substrate (first peak and shoulder). The third peak corresponds to the molecules that have been promoted to the bilayer. Notice that in all cases, there is no layer promotion for C5 (pentane), indicating that over all compositions studied at T = 110K, monolayers with C5 impurities exhibit a solid phase.

Cary Pint, University of Northern Iowa