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| 1 | Position-resolved Surface Characterization and Nanofabrication Using an Optical Microscope Combined with a Nanopipette/Quartz Tuning Fork Atomic Force Microscope显示文摘In this work, we introduce position-resolved surface characterization and nanofabrication using an optical microscope(OM) combined with a nanopipette-based quartz tuning fork atomic force microscope(nanopipette/QTF-AFM) system. This system is used to accurately determine substrate position and nanoscale phenomena under ambient conditions. Solutions consisting of 5 nm Au nanoparticles, nanowires, and polydimethylsiloxane(PDMS) are deposited onto the substrate through the nano/microaperture of a pulled pipette. Nano/microscale patterning is performed using a nanopipette/QTF-AFM, while position is resolved by monitoring the substrate with a custom OM. With this tool, one can perform surface characterization(force spectroscopy/microscopy) using the quartz tuning fork(QTF) sensor. Nanofabrication is achieved by accurately positioning target materials on the surface, and on-demand delivery and patterning of various solutions for molecular architecture. | Sangmin An Baekman Sung Haneol Noh Corey Stambaugh Soyoung Kwon Kunyoung Lee Bongsu Kim Qhwan Kim Wonho Jhe | 2014 | Nano-Micro Letters2014，6，1： | 2 |
| 2 | 3D-printed gelatin methacrylate (GelMA)/ silanated silica scaffold assisted by two-stage cooling system for hard tissue regeneration显示文摘Among many biomaterials,gelatin methacrylate(GelMA),a photocurable protein,has been widely used in 3D bioprinting process owing to its excellent cellular responses,biocompatibility and biodegradability.However,GelMA still shows a low processability due to the severe temperature dependence of viscosity.To overcome this obstacle,we propose a two-stage temperature control system to effectively control the viscosity of GelMA.To optimize the process conditions,we evaluated the temperature of the cooling system(jacket and stage).Using the established system,three GelMA scaffolds were fabricated in which different concentrations(0,3 and 10 wt%)of silanated silica particles were embedded.To evaluate the performances of the prepared scaffolds suitable for hard tissue regeneration,we analyzed the physical(viscoelasticity,surface roughness,compressive modulus and wettability)and biological(human mesenchymal stem cells growth,western blotting and osteogenic differentiation)properties.Consequently,the composite scaffold with greater silica contents(10 wt%)showed enhanced physical and biological performances including mechanical strength,cell initial attachment,cell proliferation and osteogenic differentiation compared with those of the controls.Our results indicate that the GelMA/silanated silica composite scaffold can be potentially used for hard tissue regeneration. | Eunjeong Choi Dongyun Kim Donggu Kang Gi Hoon Yang Bongsu Jung MyungGu Yeo Min-Jeong Park SangHyun An KyoungHo Lee Jun Sik Kim Jong Chul Kim Woonhyeok Jeong Hye Hyun Yoo Hojun Jeon | 2021 | Regenerative Biomaterials2021，8，2： | 2 |
| 3 | Functional maturation of pro-teolipid protein139-151-specific Th1 cells in the central nervous system in experimental autoimmune encephalomyelitis 显示文摘 | Mani M Bongsu K Byung S | 2004 | J Neuroimmunol2004，155，12： | 1 |
| 4 | Magnetorheological finishing pro-cess for hard materials using sintered iron-CNT compoundabrasives 显示文摘 | BONGSU J KYUNG I J | 2009 | International Journal of Machine Toolsand Manufacture2009，45，5： | 1 |
| 5 | Effect of pH Conditions on Actual and Apparent Fluoride Adsorption by Biochar in Aqueous Phase显示文摘 | Taek-Keun Oh Bongsu Choi Yoshiyuki Shinogi Jiro Chikushi | 2012 | Water Air & Soil Pollution2012，，7： | 1 |
| 6 | Utilization of biochar impregnated with anaerobically digested slurry as slow‐release fertilizer显示文摘 | Taek‐Keun Oh Yoshiyuki Shinogi Seung‐Joo Lee Bongsu Choi | 2014 | Z. Pflanzenern?hr. Bodenk2014，，1： | 1 |
| 7 | Effect of pHconditions on actual and apparent fluoride adsorption by biochar inaqueous phase 显示文摘 | TAEK-KEUN 0 BONGSU C YOSHIYUKI S | 2012 | Water Air Soil Pollution2012，223，7： | 1 |
| 8 | Biodistribution of encapsulated indocyanine green in healthy mice 显示文摘 | Mohammad A Y Jie Yu Bongsu J | 2009 | Molecular Pharmaceutics2009，6，5： | 1 |
| 9 | An Integrated Micro HTS System for Energy Storage and Attitude Control for Three - Axis Stabilized NanosateUites0 显示文摘 | Bongsu Kim Junseok Ko | 2005 | IEEE Transactions On Applied Uperconductivity June 2005 152005，，： | 1 |
| 10 | Capillary grip-induced stick-slip motion显示文摘We present capillary grip-induced stick-slip motion,a nanoscale tribological effect,where the role of a nanoscale confined water meniscus formed between a buckled sharp tip and a glass or mica surface is addressed by shear dynamic force measurement.We obtained the effective elasticity,viscosity,conservative(elastic)and non-conservative(viscous)forces,energy dissipation,and lateral force using small oscillation,amplitude-modulation,and shear-mode quartz tuning fork-atomic force microscopy(QTFAFM).We distinguished the conservative and non-conservative forces by investigating the dependence of normal load and relative humidity,slip length,and stick-slip frequency.We found that the confined nanoscale water enhances the lateral forces via capillary grip-induced stick-slip on a rough surface,resulting in an increase of static lateral force(3-fold for both substrates)and kinetic lateral force(6-fold for glass,3-fold for mica).This work provides quantitative and systematic understanding of nanoscale tribology properties in humid ambient conditions and is thus useful for control of friction as well as characterization of tribology in nanomaterials and nanodevices. | Sangmin An Manhee Lee Bongsu Kim Wonho Jhe | 2022 | Nano Research2022，15，8： | 0 |
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