2013, XVIII, 153 p. 96 illus., 25 illus. in color.
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Nominated as an outstanding Ph.D. thesis by the Max Planck Institute for Dynamics and Self Organization (MPIDS), Göttingen, Germany
Comprehensive coverage through illustrations and gradual development of the topic
Gives a clear view of the interdisciplinary possibilities offered by Topological Microfluidics
Explores a variety of experimental cases of potential interest to numerical/theoretical physicists
Author's comments/inputs on the practical aspects of the work will be especially useful to experimental physicists
This work represents one of the first comprehensive attempts to seamlessly integrate two highly active interdisciplinary domains in soft matter science – microfluidics and liquid crystals (LCs). Motivated by the lack of fundamental experiments, Dr. Sengupta initiated systematic investigation of LC flows at micro scales, gaining new insights that are also suggestive of novel applications. By tailoring the surface anchoring of the LC molecules and the channel dimensions, different topological constraints were controllably introduced within the microfluidic devices. These topological constraints were further manipulated using a flow field, paving the way for Topological Microfluidics. Harnessing topology on a microfluidic platform, as described in this thesis, opens up capabilities beyond the conventional viscous-dominated microfluidics, promising potential applications in targeted delivery and sorting systems, self-assembled motifs, and novel metamaterial fabrications.