2026-09-20T02:08:41Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/97459 2023-07-11 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

en Copyright 2017 Jun Kyu Park Droplet manipulation Shape memory polymer Kim, Seok Park, Jun Kyu 2017-08-10T19:16:01Z 2017-08-10T19:16:01Z 2017-04-28 2017-05 While methods for dynamic tuning of surface wettability to manipulate water droplets have been widely explored for many applications including digital microfluidics, those based on dynamically changeable surface morphology have remained challenging to achieve. In this work, we present a structured shape memory polymer (SMP) surface which shows dynamically tunable surface wettability through changeable surface morphology in order to manipulate water droplets. The structured SMP surface involves a SMP pillar array consisting of nanotextured small and large pillars which can change its morphology between permanent and temporary shapes upon thermomechanical loading. Specifically, the structured SMP surface dynamically creates a surface morphological gradient and changes its surface wettability during thermally induced shape recovery of the SMP pillar array. Different wetting characteristics of the structured SMP surface between permanent and temporary shapes are theoretically predicted and experimentally verified. Based on these measured wetting characteristics, the structured SMP surface is designed to demonstrate that the morphological difference between two shapes under a water droplet overcomes contact angle hysteresis, resulting in driving a water droplet, when combined with the thermal Marangoni effect. Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-08-10 without embargo terms The student, Jun Kyu Park, accepted the attached license on 2017-04-27 at 16:47. The student, Jun Kyu Park, submitted this Thesis for approval on 2017-04-27 at 16:52. This Thesis was approved for publication on 2017-04-28 at 13:26. DSpace SAF Submission Ingestion Package generated from Vireo submission #11019 on 2017-08-10 at 13:45:43 Made available in DSpace on 2017-08-10T19:16:01Z (GMT). No. of bitstreams: 2 PARK-THESIS-2017.pdf: 11043624 bytes, checksum: 8290b43eb2a0707d522107225e524867 (MD5) LICENSE.txt: 4209 bytes, checksum: 65472c10eef222ef9bf538539e5a857e (MD5) Previous issue date: 2017-04-28 application/pdf http://hdl.handle.net/2142/97459 Superhydrophobic Droplet manipulation on structured shape memory polymer surface text text Mechanical Sci & Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Thesis M.S.