| Summary: | The real time video monitoring revealed that the surfactant plays a dominating role to
determine the wetting angle of the colloidal suspension in a sessile drop once the
suspension was added with surfactant. Meanwhile, surfactant also had great influence on
the detailed assembly process and the final lattice structure. Generally, colloidal
suspension without surfactant would prefer to form clusters before the particles assemble
to the edge. Suspension with anionic surfactant SDS prefer to form close packed HCP
structure, while suspension with cationic surfactant DTAB prefer to form amorphous
structure. It was also found that, for suspension without addition of surfactant and
suspension with nonionic surfactant CO720, square lattice was capable to be formed.
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