A5084585751- Polydiacetylene-based materials and applications
- Supramolecular Self-Assembly in Materials
- Block Copolymer Self-Assembly
- Genomics, phytochemicals, and oxidative stress
- Luminescence and Fluorescent Materials
- Antimicrobial Peptides and Activities
- Nanofabrication and Lithography Techniques
- Advanced Polymer Synthesis and Characterization
- ZnO doping and properties
- CO2 Reduction Techniques and Catalysts
- Glutathione Transferases and Polymorphisms
- Gas Sensing Nanomaterials and Sensors
- Microbial metabolism and enzyme function
- Enzyme Catalysis and Immobilization
- 3D Printing in Biomedical Research
- Chemical Reactions and Isotopes
- Silk-based biomaterials and applications
- Nanowire Synthesis and Applications
- Synthesis and Biological Evaluation
- Amino Acid Enzymes and Metabolism
- Advancements in Photolithography Techniques
- Polymer Surface Interaction Studies
- Click Chemistry and Applications
- Photochromic and Fluorescence Chemistry
- Hydrogels: synthesis, properties, applications
Samsung (South Korea)
2008-2024
Konkuk University
2023-2024
Pusan National University
2023-2024
Purdue University West Lafayette
2024
Yeungnam University
2024
Rutgers, The State University of New Jersey
2018-2023
Chosun University
2022
Jeonbuk National University
2019-2021
Chungbuk National University
2021
Kwangwoon University
2014-2016
Abstract Polydiacetylenes (PDAs), a family of highly π‐conjugated polymers, have unique characteristics associated with their ability to self‐assemble. Disruption the extensively delocalized enyne backbones molecularly ordered PDA sidechains induces blue‐to‐red color change, which has been elegantly applied in design chemosensors. Recently, colorimetrically reversible PDAs received significant attention, not only gain better understanding fundamentals chromism, but also develop methodologies...
The directed assembly of block copolymer nanostructures with large periods exceeding 100 nm remains challenging because the translational ordering long-chained is hindered by its very low chain mobility. Using a solvent-vapor annealing process neutral solvent, which was sequentially combined thermal process, we demonstrate rapid evolution perpendicularly oriented lamellar morphology in high molecular weight films on substrate. synergy topographically patterned substrate facilitated...
Novel, stimulus-responsive supramolecular structures in the form of fibers, gels, and spheres, derived from an azobenzene-containing benzenetricarboxamide derivative, are described. Self-assembly tris(4-((E)-phenyldiazenyl)phenyl)benzene-1,3,5-tricarboxamide (Azo-1) aqueous organic solvent systems results dependent generation microfibers (aq DMSO), gels DMF), hollow spheres THF). The a single crystal X-ray diffraction analysis Azo-1 (crystallized mixture DMSO H2O) reveal that it possesses...
We accomplished truly scalable, low cost, arbitrarily large-area block copolymer lithography, synergistically integrating the two principles of graphoepitaxy and epitaxial self-assembly. Graphoepitaxy morphology composed highly aligned lamellar film that self-assembled within a disposable photoresist trench pattern was prepared by conventional I-line lithography utilized as chemical nanopatterning mask for underlying substrate. After layer were removed, same epitaxially assembled on exposed...
We present the photoelectrochemical (PEC) regeneration of nicotinamide cofactors (NADH) coupled with enzymatic synthesis formate from CO<sub>2</sub> towards mimicking natural photosynthesis.
Hierarchical self-assembly of block copolymers has been achieved by two steps sequential ordering processes, consisting self-organized micropatterning from a dewetting polymer solution and thermal annealing. The micropattern induces the spontaneous alignment self-assembled lamellae (see figure), which is successfully applied for lithography-free, ultra-large-scale nanopatterning.
Homologous recombination (HR) is critical for error-free repair of DNA double-strand breaks. Chromatin loading RAD51, a key protein that mediates the recombination, crucial step in execution HR repair. Here, we present evidence SUMOylation RAD51 recruitment to chromatin and We found topoisomerase 1-binding arginine/serine-rich (TOPORS) induces at lysine residues 57 70 response damaging agents. The was facilitated by an ATM-induced phosphorylation TOPORS threonine 515 upon damage. Knockdown...
Abstract Here, spontaneous lamellar alignment in a thickness‐modulated block copolymer film is presented as facile, scalable, and general approach for creating highly aligned morphology. Thickness‐modulated films are prepared on neutral surfaces by various methods, such solution dropping, dewetting‐induced self‐organized patterning, thermal imprinting. Regardless of the preparation method, self‐assembled domains become spontaneously along thickness gradient after sufficient annealing....
A silicon-based photoelectrochemical cell is developed to convert CO<sub>2</sub> formate with water as an electron donor by using dehydrogenase from <italic>Thiobacillus</italic> sp.
Rheumatoid arthritis is a rheumatic disease for which healing treatment does not presently exist. Silk fibroin has been extensively studied use in drug delivery systems due to its uniqueness, versatility and strong clinical track record medicine. However, general, natural polymeric materials are mechanically stable enough, have high rates of biodegradation. Thus, synthetic such as gellan gum can be used produce composite structures with biological signals promote tissue-specific interactions...
Herein, an injectable thermosensitive hydrogel was developed for a drug and cellular delivery system. The composite prepared by facile physical mixing of pluronic F-127 (PF) silk fibroin (SF) in aqueous solution. chemical structure, transparency, viscosity, injectability, degradation kinetic, cumulative release dexamethasone (Dex), type corticosteroid drug, size distribution the fabricated hydrogels were characterized. Cytotoxicity also studied to verify biocompatibility hydrogels. addition...
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication the EditorNEXTα-Cyclodextrin: A Molecule for Testing Colorimetric Reversibility of Polydiacetylene SupramoleculesSumi Lee and Jong-Man KimView Author Information Department Chemical Engineering, Hanyang University, Seoul 133-791, Korea Cite this: Macromolecules 2007, 40, 26, 9201–9204Publication Date (Web):December 1, 2007Publication History Received9 November 2007Published online1 December inissue 1...
Abstract It is shown that due to the inherent irreversible non‐fluorescence fluorescence transition feature of polydiacetylene (PDA) supramolecules occurs in response thermal perturbations, PDA vesicles embedded a host polymer matrix function as nano/microscale temperature indicators. As result, they are used monitor gradients on an integrated circuit chip and uncover submicrometer size filamentary defects resistance random access memory (RRAM) device structure. This new methodology should...
The cellular transplantation approach to treat damaged or diseased retina is limited because of poor survival, distribution, and integration cells after implantation the sub-retinal space. To overcome this, it important develop a cell delivery system. In this study, ternary hydrogel gelatin (Ge)/gellan gum (GG)/glycol chitosan (CS) suggested as carrier for retinal tissue engineering (TE). Physicochemical properties such porosity, swelling, sol fraction, weight loss were measured. mechanical...
A new class of nonpolymeric thermosensitive materials based on the benzene-1,3,5-tricarboxamide (BTC) structural platform are described. We observed that benzocrown ether-substituted BTC derivatives undergo an unusual temperature-dependent reversible solubility change in aqueous solution. Thus, a clear nonfluorescent solution becomes turbid and generates fluorescent aggregates above LCST temperature. The disappear, is reformed when cooled to 20 °C. It believed behavior results from removal...
Abstract Balancing the interfacial interactions between a polymer and substrate is one of most commonly employed methods to ensure vertical orientation nanodomains in block copolymer lithography. Although number technologies have been developed meet this challenge, there remains need for universal solution surface neutralization that combines simple synthesis, fast processing times, generality toward substrate, low density film defects, good adhesion. The chemistry ketenes, which highly...