Ghasemi, Hadi2019-11-172019-11-17December 22016-12December 2Portions of this document appear in: Irajizad, Peyman, Nazanin Farokhnia, and Hadi Ghasemi. "Dispensing nano-pico droplets of ferrofluids." Applied Physics Letters 107, no. 19 (2015): 191601.https://hdl.handle.net/10657/5443Dispensing miniature volumes of a ferrofluid is of fundamental and practical importance for diverse applications ranging from biomedical devices, optics, and self-assembly of materials. Current dispensing systems are based on microfluidics flow-focusing approaches or acoustic actuation requiring complicated structures. A simple method is presented to continuously dispense the miniature droplets from a ferrofluid reservoir. Once a jet of the ferrofluid is subjected to a constrained flux through a membrane and an inhomogeneous magnetic field, the jet experiences a curvature-driven instability and transforms to a droplet. Ferrofluid droplets in the range of 0.1–1000 nl are dispensed with tunable dispensing frequencies. A model was developed, which predicts the dispensed volume of the ferrofluid droplets with an excellent agreement with the measurements.application/pdfengThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).DispensingFerrofluids2019-11-17Thesisborn digital