Stretchable Electronics: Materials, Fabrication, and Applications Ja Hoon Koo1 1Department of Semiconductor Systems Engineering, Sejong University, Seoul 08826, Republic of Korea. Stretchable devices based on high-performance inorganic materials require the use of stretchable device designs such as wavy interconnects and kirigami structures, which sacrifices the device density to...
Water-Accelerated Synergistic Organocatalysis to Access Alkylsulfonyl Fluorides as Efficient SuFEx Hubs Han Yong Bae Department of Chemistry, Sungkyunkwan University, Suwon, 16419, Korea E-mail: hybae@skku.edu Along with the significant demand for sustainable homogeneous catalysis, the importance of efficient synthesis and simple purification of complex organic compounds is attracting attention.1 In this presentation, a series of water-accelerated chemical transformations will be discussed. Firstly, unprecedented N-heterocyclic carbene (NHC)-catalyzed aza-Michael addition reaction is shown to access β-aminosulfonyl fluorides, which are key hubs of the sulfur(VI) fluoride exchange (SuFEx) reaction.2 In addition, new methods based on high-turnover catalytic Michael and thia-Michael addition reactions via significant hydrophobic amplification are displayed.3–5 Finally, the synergistic action of a hydrophobic Brønsted acid in combination with a hydrogen-bonding donor activator enabled the formation of the three-component Petasis-type allylation reaction.6 The developed exceptionally mild but potent catalytic systems facilitated a broad substrate scope, and enabled efficient multi-gram scalabilities. As a crucial reaction medium in all cases, water considerably augmented the reaction rate with excellent chemo- and site-selectivity (up to >99:1) compared to conventional organic solvents....
Active magnetic bearings are a mechatronic device which utilizes magnetic forces to levitate rotating shaft without mechanical contact. They enable higher speeds because of reduced losses. Also, the dynamics of the system can be adjusted by modifying the control law of magnetic bearings. In this...
Adhesive Platform Biomaterials for Tissue Regenerative and Drug Delivery Therapeutics Hyung Joon Cha Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 37673, Korea E-mail: hjcha@postech.ac.kr Marine mussel adhesion is known to be mediated by adhesive proteins, which are secreted through the mussel byssus and have great potential as biologically and environmentally friendly adhesive biomaterials due to their biocompatibility and biodegradability. In addition, mussel adhesive proteins have strong adhesion ability even on wet and underwater surfaces due to their unique amino acid arrangements and composition. However, researches using the natural amino acid composition have been limited due to extreme difficulties in obtaining sufficient quantities of mussel adhesive proteins for practical applications and commercialization. Previously, we successfully produced redesigned mussel adhesive protein using a bacterial expression system and this bioengineered mussel adhesive protein showed significant adhesion ability and biocompatibility. In this talk, I will present our research team’s efforts on development and evaluation of mussel adhesive protein as an innovative adhesive biomaterial in diverse regenerative medicine and localized drug delivery....
Dynamic assembly of conducting nanomaterials in polymer Jiheong Kang (강지형 교수) 1 Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea *E-mail : jiheongkang@kaist.ac.kr In this presentation, I will first show my approaches to designing mechanically tough yet dynamic polymer networks...
Geometrically Designed 3D Nanostructure for High Performance MEMS Devices Min-Ho Seo School of Biomedical Convergence Engineering, Pusan National University, Republic of Korea Recently, MEMS (micro-electromechanical systems), appropriate to demonstrate high performance sensors and actuators, has gain great interests in academia and industry, because it can be a key technology...
Quantum Dots for Mechanoluminescent and Optoelectronic Applications Hyosung Choi Mechanoluminescence (ML), a novel process that converts mechanical momentum to light emission, has shown potential for sustainable future technologies. However, the lights emitted from classical ML materials have shown broad emission spectra and a limitation in the choice of colors so far, constraining the full-color implementation of ML. Herein, a quantum dot (QD)-in-mechanoluminescent matrix (QMM) architecture is introduced by simply incorporating QDs with the classical ML-active matrices, designed to utilize the sharp emission spectra of the QDs. The QMMs demonstrate dis-tinctive green and red lights identical to the emissions from the QDs through mechanical stimuli, achieving the purest ML reported to date. Furthermore, the deployments of the QDs allow the full-color implementation of ML covering a wide color gamut, as well as the demonstration of the purest white reported to date. Systematic investigations reveal that the ML operation in the QMM is governed according to the ML-stimulated photoluminescence (PL) mechanism, preventing energy or charge transfer processes. Moreover, the QMMs exhibit excellent stabilities upon environmental stresses and the patterned system is readily prepared, guaranteeing both robustness and easy processability of the system. This simple QMM strategy suggests practical insights for the development of powerless ML display and lighting systems. ...
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