Education

Research Description

Dr. Ryu actively conducts research on 1) Large area manufacturing of metamaterials and integration with electronics; 2) Design and fabrication of actively tunable metacomposite materials; and 3) Multimaterial additive manufacturing.

Publications

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Grants

Collaborative Research: Template-free roll coatings for scalable manufacturing of regular microstructures by controlling ribbing instabilities

National Science Foundation (NSF)(9/01/20 - 8/31/23)

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Collaborative Research: Template-free roll coatings for scalable manufacturing of regular microstructures by controlling ribbing instabilities

Sponsor: National Science Foundation (NSF)

Start Date: 9/01/20

End Date: 8/31/23

Abstract

The long-term goal of the research is to develop an economical manufacturing method producing large-area superhydrophobic (SHPo) surfaces for hydrodynamic drag reduction (DR) by utilizing spontaneous 3-dimensional (3D) structure generation in roll coating of viscoelastic composite polymer. SHPo surfaces featured by 3D topographical structures are studied as a superior DR technology. While there is a spray-type product that coats a layer of random 3D geometry, it was found that the periodic linear grating structures provide superior DR performance stability. However, the high cost of producing large-area SHPo surfaces with periodic grating structure by the lithography-based micro-fabrication is still an obstacle to practical implementation. To address this challenge, we propose to utilize an inexpensive and scalable roll coating method producing the linear grates by the ribbing instability, which are spontaneously generated on the polymer surface due to the shear stress applied by the rollers. The specific objectives for the long-term goal are (1) to test the hypothesis that linear ribbing can be obtained near the instability onset condition predicted by a theoretical model and observed for the different manufacturing processes for polymer composites, and (2) to establish the fundamental knowledge of the relationship between the roll coating process conditions, the micro-grating structure geometry, and the DR efficiency.

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