Dr. Ji Ha, Lee
Presentation day
Wednesday 7:50 PM
TITLE
Supramolecular gels with high strength by tuning of calix[4]arene-derived networks
Abstract
Supramolecular gels comprised of low-molecular-weight gelators are generally regarded as mechanically weak and unable to support formation of free-standing structures, hence, their practical use with applied loads has been limited. Here, we reveal a technique for in situ generation of high tensile strength supramolecular hydrogels derived from low-molecularweight gelators. By controlling the concentration of hydrochloric acid during hydrazone formation between calix-[4]arene-based gelator precursors, we tune the mechanical and ductile properties of the resulting gel. Organogels formed without hydrochloric acid exhibit impressive tensile strengths, higher than 40MPa, which is the strongest among self-assembled gels. Hydrogels, prepared by solvent exchange of organogels in water, show 7,000- to 10,000-fold enhanced mechanical properties because of further hydrazone formation. This method of molding also allows the gels to retain shape after processing, and furthermore, we find organogels when prepared as gel electrolytes for lithium battery applications to have good ionic conductivity.
CV
2015.10- present JSPS Postdoctoral Fellow, Department of Chemistry and Biochemistry, The University of Kitakyushu, Fukuoka, Japan, Advisor: Prof. Kazuo Sakurai.
2015.03 - 2015.09 KRF Postdoctoral Fellow, Gyeongsang National University, Jinju, South Korea, Advisor: Prof. Jong Hwa Jung
2010.03. – 2015.02 Ph. D. in Inorganic Chemistry, Gyeongsang National University, Jinju, South Korea, Advisor: Prof. Jong Hwa Jung
2006 .03 - 2010.02 B. S. in Chemistry, Gyeongsang National University, Jinju, South Korea
Literatures
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Ji Ha Lee, Jaehyeon Park, Jin- Woo Park, Hyo- Jun Ahn, Justyn Jaworski and Jong Hwa Jung, Supramolecular Gels with High Strength by Tuning of Calix[4]arene-Derived Networks, Nature Communications, 2015, 6, 6650. (March, 2015).
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Ji Ha Lee, Chaelin Kim and Jong Hwa Jung, Control of the Rheological Properties of Clay Nanosheet Hydrogels with a Guanidinium-attached Calix[4]arene Binder, Chemical Communication, 2015, 51, 15184—15187. (September, 2015)
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3. Ji Ha Lee, Sunwoo Kang, Jin Yong Lee, Justyn Jaworski, and Jong Hwa Jung, Instant Visual Detection of Picogram Levels of Trinitrotoluene by Using Luminescent Metal–Organic Framework Gel-Coated Filter Paper, Chemistry - A European Journal, 2013, 19, 16665-16671. (November, 2013)
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4. Ji Ha Lee, Junho Ahn, Mitsutoshi Masuda, Justyn Jaworski, and Jong Hwa Jung, Reinforcement of a Sugar-Based Bolaamphiphile/ Functionalized Graphene Oxide Composite Gel: Rheological and Electrochemical Properties, Langmuir, 2013, 29, 13535-13541. (October, 2013)
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5. Ji Ha Lee, Justyn Jaworski and Jong Hwa Jung, Luminescent Metal-Organic Framework-Functionalized Graphene Oxide Nanocomposites and Reversible Detection of High Explosives, Nanoscale, 2013, 5, 8533-8540. (June, 2013)
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6. Jong Hwa Jung, Ji Ha Lee, Julian R. Silverman and George John, Coordination Polymer Gels with Important Environmental and Biological Applications, Chemical Society Reviews, 2013, 42, 924-926. (February, 2013) .
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7. Ji Ha Lee, Sunwoo Kang, Justyn Jaworski, Ki-Young Kwon, Moo Lyong Seo, Jin Yong Lee, and Jong Hwa Jung, Fluorescent Metal-Organic Framework/Functionalized Graphene Oxide Composite Hydrogel, Chemistry - A European Journal,2012, 18, 765-769. (January, 2012)
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8. Ji Ha Lee, Sunwoo Kang, Jin Yong Lee and Jong Hwa Jung, A Tetrazole-Based Metallogel Induced with Ag+ Ion and Its Silver Nanoparticle in Catalysis, Soft Matter, 2012, 8, 2557-2563. (May, 2012)
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9. Ji Ha Lee, Hyejin Lee, Sungmin Seo, Justyn Jaworski, Moo Lyong Seo, Sunwoo Kang, Jin Yong Lee and Jong Hwa Jung, Fluorescence Enhancement of a Tetrazole-Based Pyridine Coordination Polymer Hydrogel, New Journal of Chemistry, 2011, 35, 1054-1059. (March, 2011)
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10. Jong Hwa Jung, Ji Ha Lee and Seiji Shinkai, Functionalized Magnetic Nanoparticles as Chemosensors and Adsorbents for Toxic Metal Ions in Environmental and Biological Fields, Chemical Society Reviews, 2011, 40, 4464-4876. (September, 2011)