Howon Lee, PhDAssociate Professor

Department of Mechanical Engineering

Advanced Manufacturing and Smart Materials Laboratory

(3D/4D Printing)

Professor Howon Lee

Associate ProfessorDepartment of Mechanical EngineeringSeoul National University Email: howon.lee@snu.ac.krHompage: http://howon78.wixsite.com/snusitePhone: +82-2-880-7117

Education/Career

- Associate Professor, Seoul National University, 2021 - present

- Assistant Professor, Rutgers University - New Brunswick, 2014-2020

- Postdoctoral Associate, MIT, 2012-2013

- PhD in Mechanical Engineering, University of Illinois at Urbana-Champaign, 2011

- MS in Mechanical Engineering, Seoul National University, 2006

- BS in Mechanical and Aerospace Engineering, Seoul National University, 2004

Novel DesignBio-inspired, architected

materials

Advanced Manufacturing

3D, additive, fast, versatile,

scalable

Advanced Materials

Active, responsive,

reconfigurable

Research Thrusts

Digital micro 3D printing

§ High-resolution (~5𝜇𝑚)§ No support structure§ No post-process

§ Rapid (~1s/layer)§ Wide material sets

available

Process modeling and simulation

Multi-material micro 3D printing

Digital 3D Printing

Rev. Sci. Instr. 83, 125001 (2012); App. Sci., 9(1), 151 (2019); Additive Manufacturing, 27, 606 (2019); U.S. Patent No. 9,492,969

Temperature Responsive Hydrogel Electroactive Hydrogel

Scientific Reports 8, 1963 (2018); ACS Applied Materials & Interfaces 10 (21), 17512-17518 (2018)

E-field responsive swellingThermo-responsive swelling

Underwater locomotion

4D Printing - 3D Printing with Active Materials

Professor Howon Lee

Light Responsive Hydrogel

ACS Applied Materials & Interfaces (2021)

4D Printing - 3D Printing with Active Materials

Piezoelectric Material (PVDF)

Composition: PVDF 35 wt%, PEGDA 250 40 wt%, DEF 25 wt%, PI 2 wt%, PA 0.1 wt%Printing parameters: 2 sec @ 50 µmDimension: 10 x 10 x 11.3 mm

Professor Howon Lee

Ultralight ultra-stiff material Metamaterial with tunable stiffness

Science, 344, 1373 (2014); Scientific Reports 6, 31110 (2016); Materials Horizons 6, 1244 (2019)

Octet-truss microlattice ER ~ ρR

1

tension

Stretch-dominated

1 mmReconfigurable and recoverable lightweight microlattice

Shape memory polymer

~60g

~1.5g

Tunable shock absorption

Mechanical Metamaterials

Professor Howon Lee

Professor Howon Lee

Novel Architected Materials

Tunable and Adaptable Metamaterials Biomedical Micro-devices

Versatile Manufacturing Platform

multi-material

Enhanced adhesion

µ-3D printing

Dimensionality(2D, 3D, 4D)

Materialsets

Heterogeneity Scalability

Throughput

Advanced Manufacturing

Solid Mechanics Fluid Mechanics Dynamics Thermal Science Bioengineering

High Impact, Multi-Disciplinary, Creative

Thank you

http://howon78.wixsite.com/snusite