科研之友
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摘要
In this paper, half-tubes, micro-wires and ribbons were constructed in a simple cholesterol-based organogel by varying polar gelation solvents such as acetonitrile, isopropanol, and ethanol. All of them showed hydrophobic surfaces with water contact angles more than 140 degrees. Moreover, the interlaced micro-wires obtained from isopropanol were of 500 mu m in length, which could hold a water droplet even at an 80 degrees incline. The formation and the characterization of the half-tube were followed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). X-Ray diffraction (XRD) and UV-vis spectra revealed that the aggregates were constructed by dimers of the molecules with H aggregates in the layer structure. It was proposed that hydrogen bonding, hydrophobic interactions, pi-pi stacking as well as solvent molecules played an important role in the assembly.
