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Trapping macromolecules in nanopits finds multifarious applications inpolymer separation, filtering biomolecules etc. However, tuning the locomotionof polymers in channels of nanoscopic dimensions is greatly restricted by thecomparative advective and diffusive components of velocities. Using the polymeraffinity toward the solvent and the wall, and the polymer structure, amechanism is proposed to induce selective trapping of polymers. Similar tofractional distillation of hydrocarbons based on molecular weight, a techniqueof fractional segregation, depending on the channel wettability of polymericchains at different depths in a pit that is located perpendicular to the flowis suggested. Depending on the properties of the polymeric chains and thesurface chemistry, the segregation of the polymer at a particular level in thepit can be predicted. This behaviour stems from the difference in polymerstructure leading to a competition between wettability based trapping andentropic trapping. The results of this study suggest a novel way of separatingbiopolymers based on their structure without relying on the channel geometry.

Fractional Separation of Polymers in Nanochannels: Combined Influence of Wettability and Structure