DescriptionIn this dissertation, capillary-induced interactions and self-assembly behavior of amphiphilic hollow Janus cylinders at an air-water interface is numerically investigated. First, preferred orientation of a single hollow Janus cylinder is determined as a function of amphiphilicity and aspect ratio. When the cylinder is horizontal (long axis parallel to the interface), the shape of the deformed interface and the resulting capillary-induced interactions between a pair of cylinders is examined. In addition, preferred tip-to-tip or side-by-side assembly behavior of a pair of cylinders is determined by minimizing the total interfacial energy of the system. The preferred assembly behavior of a pair of hollow Janus cylinders is side-by-side for higher amphiphilicities, but as the amphiphilicity is reduced, tip-to-tip orientation becomes similarly preferable. The case of hollow Janus cylinders is also compared with their homogeneous counterparts as well as with solid homogeneous and solid Janus cylinders. The significant difference between Janus and homogeneous hollow cylinders is that the preferred orientation of a homogeneous hollow cylinder is horizontal with respect to the interface for given contact angles and at large aspect ratios. Meanwhile hollow Janus cylinders with large aspect ratios and amphiphilicities (beta≥ 20) prefer a vertical orientation (piercing the interface). The preferred orientation of a single solid Janus cylinder behaves similarly to its hollow counterpart except it prefers a vertical orientation at higher amphiphilicities. In comparison, single hollow and solid homogeneous cylinders have almost similar preferred orientation. The outcome of this study may provide insight on self-assembly behavior of model hollow particles, such as carbon nanotubes, at liquid interfaces for fabrication of functional monolayers or for use as interface stabilizers in foam and emulsions.