KSEA events Aligned carbon nanotube architectures for biomimetic metasurfaces (190807 KSEA Berkeley Chapter Seminar)
2019.08.08 01:53
TITLE: Aligned carbon nanotube architectures for biomimetic metasurfaces
SPEAKER: Sei Jin Park, Bioscience and
Biotechnology Division, Physical and Life Sciences Directorate, Lawrence
Livermore National Laboratory
ABSTRACT: Carbon
nanotubes (CNTs) possess exceptional mechanical properties and are atomically
smooth on their surfaces. Aligned growth of CNTs creates ensembles of the
graphitic cylinders that can be exquisitely used to create complex
architectures. Catalyst stacks can be engineered to control the CNT diameter,
growth rate and number density, which enables tailoring of the CNT properties
for desired functionality. Local modulation of the growth using titanium
nitride underlayer leads to curved microstructures, and subtle addition of
molybdenum to iron catalyst results in small-diameter and high-density CNT
growth. Via catalyst stack engineering, superhydrophobic surfaces with
anisotropic droplet adhesion and breathable membranes that are stimuli
responsive are developed, showcasing the potential of precisely architected
aligned CNT structures.
BIO: Dr.
Sei Jin Park is a postdoctoral researcher working for Dr. Francesco Fornasiero
in Physical and Life Sciences Directorate at Lawrence Livermore National
Laboratory (LLNL). He received his B.S.E., M.S.E., and Ph.D. in Mechanical
Engineering at University of Michigan. He was a postdoc at MIT, then served as
a technical research personnel at Seoul National University, prior to joining
LLNL.
