1
|
Heo NS, Lee SU, Rethinasabapathy M, Lee EZ, Cho HJ, Oh SY, Choe SR, Kim Y, Hong WG, Krishnan G, Hong WH, Jeon TJ, Jun YS, Kim HJ, Huh YS. Visible-light-driven dynamic cancer therapy and imaging using graphitic carbon nitride nanoparticles. Mater Sci Eng C Mater Biol Appl 2018; 90:531-538. [PMID: 29853122 DOI: 10.1016/j.msec.2018.04.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Revised: 03/07/2018] [Accepted: 04/15/2018] [Indexed: 12/27/2022]
Abstract
Organic graphitic carbon nitride nanoparticles (NP-g-CN), less than 30 nm in size, were synthesized and evaluated for photodynamic therapy (PDT) and cell imaging applications. NP-g-CN particles were prepared through an intercalation process using a rod-like melamine-cyanuric acid adduct (MCA) as the molecular precursor and a eutectic mixture of LiCl-KCl (45:55 wt%) as the reaction medium for polycondensation. The nano-dimensional NP-g-CN penetrated the malignant tumor cells with minimal hindrance and effectively generated reactive oxygen species (ROS) under visible light irradiation, which could ablate cancer cells. When excited by visible light irradiation (λ > 420 nm), NP-g-CN introduced to HeLa and cos-7 cells generated a significant amount of ROS and killed the cancerous cells selectively. The cytotoxicity of NP-g-CN was manipulated by altering the light irradiation and the BP-g-CN caused more damage to the cancer cells than normal cells at low concentrations. As a potential non-toxic organic nanomaterial, the synthesized NP-g-CN are biocompatible with less cytotoxicity than toxic inorganic materials. The combined effects of the high efficacy of ROS generation under visible light irradiation, low toxicity, and bio-compatibility highlight the potential of NP-g-CN for PDT and imaging without further modification.
Collapse
Affiliation(s)
- Nam Su Heo
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100, Inha-ro, Incheon 22212, Republic of Korea
| | - Sun Uk Lee
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | - Muruganantham Rethinasabapathy
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100, Inha-ro, Incheon 22212, Republic of Korea
| | - Eun Zoo Lee
- LG Chem Research Park, 104-1 Munji-dong, Youseong-gu, Daejeon 305-380, Republic of Korea
| | - Hye-Jin Cho
- Reliability Assessment Center for Chemical Materials, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 305-600, Republic of Korea
| | - Seo Yeong Oh
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100, Inha-ro, Incheon 22212, Republic of Korea
| | - Sang Rak Choe
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100, Inha-ro, Incheon 22212, Republic of Korea
| | - Yeonho Kim
- Division of Electron Microscopic Research, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - Won G Hong
- Division of Electron Microscopic Research, Korea Basic Science Institute, Daejeon 34133, Republic of Korea
| | - Giribabu Krishnan
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100, Inha-ro, Incheon 22212, Republic of Korea
| | - Won Hi Hong
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | - Tae-Joon Jeon
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100, Inha-ro, Incheon 22212, Republic of Korea
| | - Young-Si Jun
- School of Chemical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea.
| | - Hae Jin Kim
- Division of Electron Microscopic Research, Korea Basic Science Institute, Daejeon 34133, Republic of Korea.
| | - Yun Suk Huh
- Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100, Inha-ro, Incheon 22212, Republic of Korea.
| |
Collapse
|
2
|
Kim GH, Jung TS, Hong WH, Kim JN, Kim JD. Antisolvent Precipitation of Potassium Bicarbonate from KHCO 3 + H 2O + Ethanol/2-Propanol Systems in the CO 2 Capture Process. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b01696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gyo Hee Kim
- Department
of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Guseong-dong 373-1, Yusong-gu, Daejeon, Republic of Korea
| | - Tae-Sung Jung
- High
Efficiency and Clean Energy Research Division, Korea Institute of Energy Research, 71-2 Jang-dong, Yusong-gu, Daejeon, Republic of Korea
| | - Won Hi Hong
- Department
of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Guseong-dong 373-1, Yusong-gu, Daejeon, Republic of Korea
| | - Jong-Nam Kim
- High
Efficiency and Clean Energy Research Division, Korea Institute of Energy Research, 71-2 Jang-dong, Yusong-gu, Daejeon, Republic of Korea
| | - Jong-Duk Kim
- Department
of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Guseong-dong 373-1, Yusong-gu, Daejeon, Republic of Korea
| |
Collapse
|
3
|
Pawelski A, Jeon SJ, Hong WH, Paschedag AR, Kraume M. Interaction of a homogeneous chemical reaction and mass transfer in a single moving droplet. Chem Eng Sci 2013. [DOI: 10.1016/j.ces.2013.08.045] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
4
|
Jun YS, Park J, Lee SU, Thomas A, Hong WH, Stucky GD. Three-Dimensional Macroscopic Assemblies of Low-Dimensional Carbon Nitrides for Enhanced Hydrogen Evolution. Angew Chem Int Ed Engl 2013; 52:11083-7. [DOI: 10.1002/anie.201304034] [Citation(s) in RCA: 243] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Revised: 08/03/2013] [Indexed: 11/08/2022]
|
5
|
Jun YS, Park J, Lee SU, Thomas A, Hong WH, Stucky GD. Three-Dimensional Macroscopic Assemblies of Low-Dimensional Carbon Nitrides for Enhanced Hydrogen Evolution. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304034] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
6
|
Park HS, Choi BG, Hong WH, Jang SY. Controlled assembly of graphene oxide nanosheets within one-dimensional polymer nanostructure. J Colloid Interface Sci 2013; 406:24-9. [PMID: 23810546 DOI: 10.1016/j.jcis.2013.03.072] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Revised: 03/27/2013] [Accepted: 03/29/2013] [Indexed: 10/26/2022]
Abstract
We have demonstrated that the location and distribution of graphene oxide nanosheets (GONs) confined in 1D polymer composites were readily controlled depending on the processing conditions of electrospinning such as the types of polymers and the solvents used for the fabrication. The uniform bead-free poly(vinyl alcohol) (PVA)/GON composite nanofibers (NFs) even at high GON loading were obtained from the homogeneous polymer solutions attributable to the favorable interactions, as elucidated by spectroscopic data, thereby showing significant enhancement of their physical properties. The GONs were localized in the surface regions of the PVA-NFs due to the rapid convective evaporation of the water molecules, with concomitant aggregation into several sheets (<10 layers). In contrast, the co-continuous internal morphology of PVA/GON-NFs was constructed using less-volatile, polar dimethylformamide (DMF) solvents. Furthermore, the GONs were uniformly distributed in the more compatible polymer matrices such as polyacrylonitrile (PAN) and polystyrene (PS). Therefore, the distribution of GONs in 1D nanofibers was governed by the kinetics of solvent evaporation and the interaction with the polymer matrices.
Collapse
Affiliation(s)
- Ho Seok Park
- Department of Chemical Engineering, College of Engineering, Kyung Hee University, Giheung-gu, Youngin-si, Gyeonggi-do, Republic of Korea
| | | | | | | |
Collapse
|
7
|
Choi BG, Huh YS, Hong WH, Erickson D, Park HS. Electroactive nanoparticle directed assembly of functionalized graphene nanosheets into hierarchical structures with hybrid compositions for flexible supercapacitors. Nanoscale 2013; 5:3976-3981. [PMID: 23545560 DOI: 10.1039/c3nr33674c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Hierarchical structures of hybrid materials with the controlled compositions have been shown to offer a breakthrough for energy storage and conversion. Here, we report the integrative assembly of chemically modified graphene (CMG) building blocks into hierarchical complex structures with the hybrid composition for high performance flexible pseudocapacitors. The formation mechanism of hierarchical CMG/Nafion/RuO2 (CMGNR) microspheres, which is triggered by the cooperative interplay during the in situ synthesis of RuO2 nanoparticles (NPs), was extensively investigated. In particular, the hierarchical CMGNR microspheres consisting of the aggregates of CMG/Nafion (CMGN) nanosheets and RuO2 NPs provided large surface area and facile ion accessibility to storage sites, while the interconnected nanosheets offered continuous electron pathways and mechanical integrity. The synergistic effect of CMGNR hybrids on the supercapacitor (SC) performance was derived from the hybrid composition of pseudocapacitive RuO2 NPs with the conductive CMGNs as well as from structural features. Consequently, the CMGNR-SCs showed a specific capacitance as high as 160 F g(-1), three-fold higher than that of conventional graphene SCs, and a capacitance retention of >95% of the maximum value even after severe bending and 1000 charge-discharge tests due to the structural and compositional features.
Collapse
Affiliation(s)
- Bong Gill Choi
- Department of Chem. & Biomolecular Eng. (BK 21), Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
| | | | | | | | | |
Collapse
|
8
|
Jeon S, Hong WH. Unsteady Mass Transfer Around Single Droplet Accompanied by Interfacial Extraction Reaction of Succinic Acid. Korean Chemical Engineering Research 2012. [DOI: 10.9713/kcer.2012.50.6.1021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
9
|
Park WM, Choi BG, Huh YS, Hong WH, Lee SY, Park TJ. Facile Functionalization of Colloidal Gold Nanorods by the Specific Binding of an Engineered Protein that Is Preferred over CTAB Bilayers. Chempluschem 2012. [DOI: 10.1002/cplu.201200239] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
10
|
Choi BG, Huh YS, Hong WH, Kim HJ, Park HS. Electrochemical assembly of MnO₂ on ionic liquid-graphene films into a hierarchical structure for high rate capability and long cycle stability of pseudocapacitors. Nanoscale 2012; 4:5394-5400. [PMID: 22821068 DOI: 10.1039/c2nr31215h] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Hierarchical nanostructures are of prime importance due to their large surface area, easy accessibility to reaction sites, fast ion and electron transport, and mechanical integrity. Herein, we demonstrate the synthesis of hierarchically structured MnO₂/ionic liquid-reduced graphene oxide (IL-RGO) nanocomposites through the electrochemical self-assembly. The structures of MnO₂/IL-RGO nanocomposites and their formation mechanism are investigated by spectroscopic methods and as a consequence, correlated with the electrochemical behaviours. The specific capacitance (511 F g⁻¹) of conformally MnO₂-deposited IL-RGO composites is significantly higher than 159 F g⁻¹ of pure MnO₂ film. High rate capability (61% retention at 30 A g⁻¹) of the MnO₂/IL-RGO composite is attributed to the facilitated ion diffusion and electron transport, whereas its long cycle life (95% retention after 2000 cycles) is related to the mechanical robustness. These results provide a new insight into the rational design of hierarchical and complex heterostructures consisting of carbon nanomaterials and metal oxides for applications in energy conversion and storage.
Collapse
Affiliation(s)
- Bong Gill Choi
- Department of Chem. & Biomolecular Eng. BK 21, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
| | | | | | | | | |
Collapse
|
11
|
Choi BG, Chang SJ, Kang HW, Park CP, Kim HJ, Hong WH, Lee S, Huh YS. High performance of a solid-state flexible asymmetric supercapacitor based on graphene films. Nanoscale 2012; 4:4983-8. [PMID: 22751863 DOI: 10.1039/c2nr30991b] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Solid-state flexible energy storage devices hold the key to realizing portable and flexible electronic devices. Achieving fully flexible energy storage devices requires that all of the essential components (i.e., electrodes, separator, and electrolyte) with specific electrochemical and interfacial properties are integrated into a single solid-state and mechanically flexible unit. In this study, we describe the fabrication of solid-state flexible asymmetric supercapacitors based on an ionic liquid functionalized-chemically modified graphene (IL-CMG) film (as the negative electrode) and a hydrous RuO(2)-IL-CMG composite film (as the positive electrode), separated with polyvinyl alcohol-H(2)SO(4) electrolyte. The highly ordered macroscopic layer structures of these films arising through direct flow self-assembly make them simultaneously excellent electrical conductors and mechanical supports, allowing them to serve as flexible electrodes and current collectors in supercapacitor devices. Our asymmetric supercapacitors have been optimized with a maximum cell voltage up to 1.8 V and deliver a high energy density (19.7 W h kg(-1)) and power density (6.8 kW g(-1)), higher than those of symmetric supercapacitors based on IL-CMG films. They can operate even under an extremely high rate of 10 A g(-1) with 79.4% retention of specific capacitance. Their superior flexibility and cycling stability are evident in their good performance stability over 2000 cycles under harsh mechanical conditions including twisted and bent states. These solid-state flexible asymmetric supercapacitors with their simple cell configuration could offer new design and fabrication opportunities for flexible energy storage devices that can combine high energy and power densities, high rate capability, and long-term cycling stability.
Collapse
Affiliation(s)
- Bong Gill Choi
- Division of Materials Science, Korea Basic Science Institute, Daejeon, 305-333, Republic of Korea
| | | | | | | | | | | | | | | |
Collapse
|
12
|
Huh YS, Choi BG, Hong WH. Fabrication of Nano-filter Device for High Efficient Separation and Concentration of Biomolecules. Korean Chemical Engineering Research 2012. [DOI: 10.9713/kcer.2012.50.4.738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
13
|
Choi BG, Huh YS, Hong WH. Electrochemical Characterization of Porous Graphene Film for Supercapacitor Electrode. Korean Chemical Engineering Research 2012. [DOI: 10.9713/kcer.2012.50.4.754] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
14
|
|
15
|
Choi BG, Yang M, Hong WH, Choi JW, Huh YS. 3D macroporous graphene frameworks for supercapacitors with high energy and power densities. ACS Nano 2012; 6:4020-8. [PMID: 22524516 DOI: 10.1021/nn3003345] [Citation(s) in RCA: 529] [Impact Index Per Article: 44.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
In order to develop energy storage devices with high power and energy densities, electrodes should hold well-defined pathways for efficient ionic and electronic transport. Herein, we demonstrate high-performance supercapacitors by building a three-dimensional (3D) macroporous structure that consists of chemically modified graphene (CMG). These 3D macroporous electrodes, namely, embossed-CMG (e-CMG) films, were fabricated by using polystyrene colloidal particles as a sacrificial template. Furthermore, for further capacitance boost, a thin layer of MnO(2) was additionally deposited onto e-CMG. The porous graphene structure with a large surface area facilitates fast ionic transport within the electrode while preserving decent electronic conductivity and thus endows MnO(2)/e-CMG composite electrodes with excellent electrochemical properties such as a specific capacitance of 389 F/g at 1 A/g and 97.7% capacitance retention upon a current increase to 35 A/g. Moreover, when the MnO(2)/e-CMG composite electrode was asymmetrically assembled with an e-CMG electrode, the assembled full cell shows remarkable cell performance: energy density of 44 Wh/kg, power density of 25 kW/kg, and excellent cycle life.
Collapse
Affiliation(s)
- Bong Gill Choi
- Division of Materials Science, Korea Basic Science Institute, Daejeon, 305-333, Republic of Korea
| | | | | | | | | |
Collapse
|
16
|
Choi BG, Park HS, Kim GH, Jung YM, Yi KB, Kim JN, Hong WH. Analysis of CO2–NH3 reaction dynamics in an aqueous phase by PCA and 2D IR COS. J IND ENG CHEM 2012. [DOI: 10.1016/j.jiec.2011.11.087] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
|
17
|
Lee EZ, Lee SU, Heo NS, Stucky GD, Jun YS, Hong WH. A fluorescent sensor for selective detection of cyanide using mesoporous graphitic carbon(iv) nitride. Chem Commun (Camb) 2012; 48:3942-4. [DOI: 10.1039/c2cc17909a] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
18
|
Abstract
The realization of highly flexible and all-solid-state energy-storage devices strongly depends on both the electrical properties and mechanical integrity of the constitutive materials and the controlled assembly of electrode and solid electrolyte. Herein we report the preparation of all-solid-state flexible supercapacitors (SCs) through the easy assembly of functionalized reduced graphene oxide (f-RGO) thin films (as electrode) and solvent-cast Nafion electrolyte membranes (as electrolyte and separator). In particular, the f-RGO-based SCs (f-RGO-SCs) showed a 2-fold higher specific capacitance (118.5 F/g at 1 A/g) and rate capability (90% retention at 30 A/g) compared to those of all-solid-state graphene SCs (62.3 F/g at 1A/g and 48% retention at 30 A/g). As proven by the 4-fold faster relaxation of the f-RGO-SCs than that of the RGO-SCs and more capacitive behavior of the former at the low-frequency region, these results were attributed to the facilitated ionic transport at the electrical double layer by means of the interfacial engineering of RGO by Nafion. Moreover, the superiority of all-solid-state flexible f-RGO-SCs was demonstrated by the good performance durability under the 1000 cycles of charging and discharging due to the mechanical integrity as a consequence of the interconnected networking structures. Therefore, this research provides new insight into the rational design and fabrication of all-solid-state flexible energy-storage devices as well as the fundamental understanding of ion and charge transport at the interface.
Collapse
Affiliation(s)
- Bong Gill Choi
- Department of Chemical & Biomolecular Engineering (BK21 program), KAIST, Daejeon 305-701, Republic of Korea
| | | | | | | | | |
Collapse
|
19
|
Choi BG, Yang MH, Park TJ, Huh YS, Lee SY, Hong WH, Park H. Programmable peptide-directed two dimensional arrays of various nanoparticles on graphene sheets. Nanoscale 2011; 3:3208-3213. [PMID: 21698323 DOI: 10.1039/c1nr10276a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this research, we report an innovative, chemical strategy for the in situ synthesis and direct two-dimensional (2D) arraying of various nanoparticles (NPs) on graphenes using both programmed-peptides as directing agents and graphenes as pre-formed 2D templates. The peptides were designed for manipulating the enthalpic (coupled interactions) constraint of the global system. Along with the functionalization of graphene for the stable dispersion, peptides directed the growth and array of NPs in a controllable manner. In particular, the sequences of peptides were encoded by the combination of glutamic acid (E), glycine (G), and phenylalanine (F) amino acids as follows: (E-G-F)(3)-G, with E for the interaction with NPs and F and G for the interaction with graphenes. For the entropic (restricted geometry) constraint, graphene was used as a 2D scaffold to tune the size, density, and position of NPs, while maintaining the intrinsic properties for electrochemical applications. The excellent quality of the resultant hybrids was demonstrated by their high electrocatalytic activity in the electrooxidation of methanol. This synergistic combination of peptides and graphenes allowed for a uniform 2D array and spontaneous organization of various NPs (i.e., Pt, Au, Pd, and Ru), which would greatly expand the utility and versatility of this approach for the synthesis and array of the advanced nanomaterials.
Collapse
Affiliation(s)
- Bong Gill Choi
- Department of Chem. & Biomolecular Eng. (BK 21), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Republic of Korea
| | | | | | | | | | | | | |
Collapse
|
20
|
Im HS, Kim SK, Lim S, Peck DH, Jung D, Hong WH. Study on the water flooding in the cathode of direct methanol fuel cells. J Nanosci Nanotechnol 2011; 11:5788-5794. [PMID: 22121608 DOI: 10.1166/jnn.2011.4504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Water flooding phenomena in the cathode of direct methanol fuel cells were analyzed by using electrochemical impedance spectroscopy. Two kinds of commercial gas diffusion layers with different PTFE contents of 5 wt% (GDL A5) and 20 wt% (GDL B20) were used to investigate the water flooding under various operating conditions. Water flooding was divided into two types: catalyst flooding and backing flooding. The cathode impedance spectra of each gas diffusion layer was obtained and compared under the same conditions. The diameter of the capacitive semicircle became larger with increasing current density for both, and this increase was greater for GDL B20 than GDL A5. Catalyst flooding is dominant and backing flooding is negligible when the air flow rate is high and current density is low. An equivalent model was suggested and fitted to the experimental data. Parameters for catalyst flooding and backing flooding were individually obtained. The capacitance of the catalyst layer decreases as the air flow rate decreases when the catalyst flooding is dominant.
Collapse
Affiliation(s)
- Hun Suk Im
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, Republic of Korea
| | | | | | | | | | | |
Collapse
|
21
|
Yang M, Choi BG, Park TJ, Heo NS, Hong WH, Lee SY. Site-specific immobilization of gold binding polypeptide on gold nanoparticle-coated graphene sheet for biosensor application. Nanoscale 2011; 3:2950-6. [PMID: 21643572 DOI: 10.1039/c1nr10197h] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The effective and strong immobilization of enzymes on solid surfaces is required for current biological applications, such as microchips, biofuel cells, and biosensors. Gold-binding polypeptide (GBP), a genetically designed peptide, possesses unique and specific interactions with a gold surface, resulting in improved enzyme stability and activity. Herein we demonstrated an immobilization method for biosensor applications through site-specific interactions between GBP-fused organophosphorus hydrolase (GBP-OPH) and gold nanoparticle-coated chemically modified graphene (Au-CMG), showing enhanced sensing capability. A flow injection biosensor was fabricated by using GBP-OPH/Au-CMG to detect paraoxons, a model pesticide, showing higher sensitivity, lower detection limit and better operating stability compared that of OPH/Au-CMG. This strategy, which integrates biotic and abiotic moieties through site-specific interactions, has a great potential for use in biosensing and bioconversion process.
Collapse
Affiliation(s)
- MinHo Yang
- Department of Chemical & Biomolecular Engineering, BK21 program, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | | | | | | | | | | |
Collapse
|
22
|
Choi BG, Hong J, Park YC, Jung DH, Hong WH, Hammond PT, Park H. Innovative polymer nanocomposite electrolytes: nanoscale manipulation of ion channels by functionalized graphenes. ACS Nano 2011; 5:5167-5174. [PMID: 21534602 DOI: 10.1021/nn2013113] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The chemistry and structure of ion channels within the polymer electrolytes are of prime importance for studying the transport properties of electrolytes as well as for developing high-performance electrochemical devices. Despite intensive efforts on the synthesis of polymer electrolytes, few studies have demonstrated enhanced target ion conduction while suppressing unfavorable ion or mass transport because the undesirable transport occurs through an identical pathway. Herein, we report an innovative, chemical strategy for the synthesis of polymer electrolytes whose ion-conducting channels are physically and chemically modulated by the ionic (not electronic) conductive, functionalized graphenes and for a fundamental understanding of ion and mass transport occurring in nanoscale ionic clusters. The functionalized graphenes controlled the state of water by means of nanoscale manipulation of the physical geometry and chemical functionality of ionic channels. Furthermore, the confinement of bound water within the reorganized nanochannels of composite membranes was confirmed by the enhanced proton conductivity at high temperature and the low activation energy for ionic conduction through a Grotthus-type mechanism. The selectively facilitated transport behavior of composite membranes such as high proton conductivity and low methanol crossover was attributed to the confined bound water, resulting in high-performance fuel cells.
Collapse
Affiliation(s)
- Bong Gill Choi
- Department of Chemical & Biomolecular Engineering (BK21 program), KAIST, Daejeon 305-701, Republic of Korea
| | | | | | | | | | | | | |
Collapse
|
23
|
|
24
|
Chen SC, Sun TH, Hong WH. The effect of thickness on the texture and magnetic properties of single-layered FePt films by rapid thermal annealing. J Nanosci Nanotechnol 2011; 11:2623-2627. [PMID: 21449440 DOI: 10.1166/jnn.2011.2715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The single-layered FePt films with thickness in the range of 5 to 50 nm are deposited directly on Si(100) substrate without underlayer, then post annealed at 700 degrees C by rapid thermal annealing (RTA) technique. As the film thickness of FePt is over 20 nm, the L1(0) FePt(111) preferred orientation is presented and tended to in-plane magnetic anisotropy. However, the L1(0) FePt(001) texture is obtained and exhibited perpendicular magnetic anisotropy as the film thickness is decreased to 10 nm. Its perpendicular coercivity (Hc(perpendicular)), saturation magnetization (Ms) and perpendicular squareness (S(perpendicular)) are 14.8 kOe, 795 emu/cm3 and 0.79, respectively. On the other hand, both the grain size and domain size of FePt film decrease with decreasing the film thickness of FePt. The grain size for 10-nm FePt film is as small as 9.7 nm with domain size of 123 nm, which reveal its significant potential as perpendicular magnetic recording media for ultra high-density recording.
Collapse
Affiliation(s)
- S C Chen
- Department of Materials Engineering, Ming Chi University of Technology, Taipei 243, Taiwan
| | | | | |
Collapse
|
25
|
Huh YS, Jeon SJ, Lee EZ, Park HS, Hong WH. Microfluidic extraction using two phase laminar flow for chemical and biological applications. KOREAN J CHEM ENG 2011. [DOI: 10.1007/s11814-010-0533-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
26
|
Ho Yang M, Choi BG, Park H, Park TJ, Hong WH, Lee SY. Directed Self-Assembly of Gold Nanoparticles on Graphene-Ionic Liquid Hybrid for Enhancing Electrocatalytic Activity. ELECTROANAL 2011. [DOI: 10.1002/elan.201000645] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
27
|
Choi BG, Hong WH, Jung YM, Park H. Charge transfer interactions between conjugated block copolymers and reduced graphene oxides. Chem Commun (Camb) 2011; 47:10293-5. [DOI: 10.1039/c1cc13465e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
28
|
Choi BG, Park H, Yang MH, Jung YM, Lee SY, Hong WH, Park TJ. Microwave-assisted synthesis of highly water-soluble graphene towards electrical DNA sensor. Nanoscale 2010; 2:2692-2697. [PMID: 20976351 DOI: 10.1039/c0nr00562b] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Graphene sheets have the potential for practical applications in electrochemical devices, but their development has been impeded by critical problems with aggregation of graphene sheets. Here, we demonstrated a facile and bottom-up approach for fabrication of DNA sensor device using water-soluble sulfonated reduced graphene oxide (SRGO) sheets via microwave-assisted sulfonation (MAS), showing enhanced sensitivity, reliability, and low detection limit. Key to achieving these performances is the fabrication of the SRGOs, where the MAS method enabled SRGOs to be highly dispersed in water (10 mg mL(-1)) due to the acidic sulfonated groups generated within 3 min of the functionalization reaction. The water-soluble SRGO-DNA (SRGOD) hybrids prepared by electrostatic interactions between a flat single layer of graphene sheets and DNAs are suitable for fabrication of electrical DNA sensor devices because of the unique electrical characteristics of SRGODs. The high sensing performance of SRGOD sensors was demonstrated with detection of DNA hybridization using complementary DNAs, single base mismatched DNAs, and noncomplementary DNAs, with results showing higher sensitivity and lower detection limit than those of reduced graphene oxide-based DNA sensors. Simple and easy fabrication of DNA sensor devices using SRGODs is expected to provide an effective way for electrical detection of DNA hybridization using miniature sensors without the labor-intensive labeling of the sensor and complex measurement equipment.
Collapse
Affiliation(s)
- Bong Gill Choi
- Department of Chemical & Biomolecular Engineering (BK21), KAIST, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | | | | | | | | | | | | |
Collapse
|
29
|
Lee EZ, Jun YS, Hong WH, Thomas A, Jin MM. Cubic Mesoporous Graphitic Carbon(IV) Nitride: An All-in-One Chemosensor for Selective Optical Sensing of Metal Ions. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201004975] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
30
|
Lee EZ, Jun YS, Hong WH, Thomas A, Jin MM. Cubic Mesoporous Graphitic Carbon(IV) Nitride: An All-in-One Chemosensor for Selective Optical Sensing of Metal Ions. Angew Chem Int Ed Engl 2010; 49:9706-10. [DOI: 10.1002/anie.201004975] [Citation(s) in RCA: 254] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
31
|
Park H, Park TJ, Huh YS, Choi BG, Ko S, Lee SY, Hong WH. Immobilization of genetically engineered fusion proteins on gold-decorated carbon nanotube hybrid films for the fabrication of biosensor platforms. J Colloid Interface Sci 2010; 350:453-8. [DOI: 10.1016/j.jcis.2010.06.058] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2010] [Revised: 06/23/2010] [Accepted: 06/23/2010] [Indexed: 10/19/2022]
|
32
|
Choi BG, Park H, Park TJ, Yang MH, Kim JS, Jang SY, Heo NS, Lee SY, Kong J, Hong WH. Solution chemistry of self-assembled graphene nanohybrids for high-performance flexible biosensors. ACS Nano 2010; 4:2910-2918. [PMID: 20377244 DOI: 10.1021/nn100145x] [Citation(s) in RCA: 169] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report the preparation of free-standing flexible conductive reduced graphene oxide/Nafion (RGON) hybrid films by a solution chemistry that utilizes self-assembly and directional convective-assembly. The hydrophobic backbone of Nafion provided well-defined integrated structures, on micro- and macroscales, for the construction of hybrid materials through self-assembly, while the hydrophilic sulfonate groups enabled highly stable dispersibility ( approximately 0.5 mg/mL) and long-term stability (2 months) for graphene. The geometrically interlocked morphology of RGON produced a high degree of mechanical integrity in the hybrid films, while the interpenetrating network constructed favorable conduction pathways for charge transport. Importantly, the synergistic electrochemical characteristics of RGON were attributed to high conductivity (1176 S/m), facilitated electron transfer (ET), and low interfacial resistance. Consequently, RGON films obtained the excellent figure of merit as electrochemical biosensing platforms for organophosphate (OP) detection, that is, a sensitivity of 10.7 nA/microM, detection limit of 1.37 x 10(-7) M, and response time of <3 s. In addition, the reliability of RGON biosensors was confirmed by a fatigue test of 100 bending cycles. The strategy described here provides insight into the fabrication of graphene and hybrid nanomaterials from a material perspective, as well as the design of biosensor platforms for practical device applications.
Collapse
Affiliation(s)
- Bong Gill Choi
- Department of Chemical & Biomolecular Engineering, KAIST, Daejeon 305-701, Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Park H, Jung YM, Yang SH, Shin W, Kang JK, Kim HS, Lee HJ, Hong WH. Spectroscopic and Computational Insight into the Intermolecular Interactions between Zwitter-Type Ionic Liquids and Water Molecules. Chemphyschem 2010; 11:1711-7. [DOI: 10.1002/cphc.200900925] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
34
|
Huh YS, Jeong CM, Chang HN, Lee SY, Hong WH, Park TJ. Rapid separation of bacteriorhodopsin using a laminar-flow extraction system in a microfluidic device. Biomicrofluidics 2010; 4:14103. [PMID: 20644672 PMCID: PMC2905269 DOI: 10.1063/1.3298608] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2009] [Accepted: 01/04/2010] [Indexed: 05/16/2023]
Abstract
A protein separation technology using the microfluidic device was developed for the more rapid and effective analysis of target protein. This microfluidic separation system was carried out using the aqueous two-phase system (ATPS) and the ionic liquid two-phase system (ILTPS) for purification method of the protein sample, and the three-flow desalting system was used for the removal of salts from the sucrose-rich sample. Partitioning of the protein sample was observed in ATPS or ILTPS with the various pHs. The microdialysis system was applied to remove small molecules, such as sucrose and salts in the microfluidic channel with the different flow rates of buffer phase. A complex purification method, which combines microdialysis and ATPS or ILTPS, was carried out for the effective purification of bacteriorhodopsin (BR) from the purple membrane of Halobacterium salinarium, which was then analyzed by sodium dodecyl sulfatepolyacrylamide gel electrophoresis and matrix-assisted laser desorptionionization time-of-flight. Furthermore, we were able to make a stable three-phase flow controlling the flow rate in the microfluidic channel. Our complex purification methods were successful in purifying and recovering the BR to its required value.
Collapse
|
35
|
Park H, Lee YC, Choi BG, Choi YS, Yang JW, Hong WH. Energy transfer in ionic-liquid-functionalized inorganic nanorods for highly efficient photocatalytic applications. Small 2010; 6:290-295. [PMID: 19924743 DOI: 10.1002/smll.200901592] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Energy transfer in self-assembled ionic liquids (ILs) and iron oxyhydroxide nanocrystals and the controlled surface chemistry of functionalized nanomaterials for photocatalytic applications are reported. Self-assembled ILs play the role of multifunctional materials in terms of constructing a well-designed nanostructure, controlling the surface chemistry, and triggering the energy transfer of functionalized materials. IL-functionalized beta-FeOOH nanorods show approximately 10-fold higher performances than those of commercial materials due to the synergistic effect of well-defined nanomaterials in diffusion-controlled reactions, specific interactions with target pollutants, and energy transfers in hybrid materials. In particular, the energy transfer in C(4)MimCl-functionalized beta-FeOOH nanorods enhances photocatalytic activity due to the generation of Fe(2+). The strategy described herein provides new insight into the rational design of functionalized inorganic nanomaterials for applications in emerging technologies.
Collapse
Affiliation(s)
- HoSeok Park
- Department of Chem. & Biomolecular Eng. (BK 21), KAIST, Daejeon, Republic of Korea
| | | | | | | | | | | |
Collapse
|
36
|
Park HS, Choi BG, Yang SH, Shin WH, Kang JK, Jung D, Hong WH. Ionic-liquid-assisted sonochemical synthesis of carbon-nanotube-based nanohybrids: control in the structures and interfacial characteristics. Small 2009; 5:1754-1760. [PMID: 19367600 DOI: 10.1002/smll.200900128] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A versatile, facile, and rapid synthetic method of advanced carbon nanotube (CNT)-based nanohybrid fabrication, or the so-called ionic-liquid-assisted sonochemical method (ILASM), which combines the supramolecular chemistry between ionic liquids (ILs) and CNTs with sonochemistry for the control in the size and amount of uniformly decorated nanoparticles (NPs) and interfacial engineering, is reported. The excellence in electrocatalysis of hybrid materials with well-designed nanostructures and favorable interfaces is demonstrated by applying them to electrochemical catalysis. The synthetic method discussed in this report has an important and immediate impact not only on the design and synthesis of functional hybrid nanomaterials by supramolecular chemistry and sonochemistry but also on applications of the same into electrochemical devices such as sensors, fuel cells, solar cells, actuators, batteries, and capacitors.
Collapse
Affiliation(s)
- Ho Seok Park
- Department of Chemsitry and Biomolecular Engineering (BK 21), Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon, 305-701, Republic of Korea
| | | | | | | | | | | | | |
Collapse
|
37
|
Park SM, Jung DH, Kim SK, Lim S, Peck D, Hong WH. The effect of vapor-grown carbon fiber as an additive to the catalyst layer on the performance of a direct methanol fuel cell. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2008.11.066] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
38
|
Choi BG, Park H, Park TJ, Kim DH, Lee SY, Hong WH. Development of the electrochemical biosensor for organophosphate chemicals using CNT/ionic liquid bucky gel electrode. Electrochem commun 2009. [DOI: 10.1016/j.elecom.2009.01.006] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
39
|
Park H, Lee YC, Gill Choi B, Suk Choi Y, Yang JW, Hi Hong W. Green one-pot assembly of iron-based nanomaterials for the rational design of structure. Chem Commun (Camb) 2009:4058-60. [DOI: 10.1039/b906464h] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
40
|
Park H, Kwon SR, Jung YM, Kim HS, Lee HJ, Hong WH. Tracking the transition behavior and dynamics of ionic transport in crystalline ionic gel electrolytes. Chem Commun (Camb) 2009:6388-90. [DOI: 10.1039/b910600f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
41
|
Choi BG, Park H, Im HS, Kim YJ, Hong WH. Influence of oxidation state of polyaniline on physicochemical and transport properties of Nafion/polyaniline composite membrane for DMFC. J Memb Sci 2008. [DOI: 10.1016/j.memsci.2008.06.061] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
42
|
Abstract
An active micromixer system utilizing the magnetic force was developed and examined for its ability to facilitate the mixing of more than two fluid flows. The mixing performance of the active micromixer was evaluated in aqueous-aqueous systems including dyes for visual observation. A complete analytical microfluidic system was developed by integrating various functional modules into a single chip, thus allowing cell lysis, sample preparation, purification of intracellular molecules, and subsequent analysis. Upon loading the cell samples and lysis solution into the mixing chamber, the integrated microfluidic device allows efficient cell disruption by rotation of a micromagnetic disk and control of mixing time using the Teflon-coated hydrophobic film as a microvalve. This inflow is followed by separating the cell debris and contaminated proteins from the cell lysate sample using the acrylamide (AAm)-functionalized SPE. The inflow of partially purified cell lysate sample containing the gold binding polypeptide (GBP)-fusion protein was bound onto the gold micropatterns by means of its metal binding affinity. The GBP-fusion method allows immobilization of proteins in bioactive forms onto the gold surface without surface modification suitable for studying antigen-antibody interaction. It was used for the detection of severe acute respiratory syndrome (SARS), an infectious viral disease, as an example case.
Collapse
Affiliation(s)
- Yun Suk Huh
- Department of Chemical and Biomolecular Engineering (BK21 program), KAIST, Yuseong-gu, Daejeon, Korea
| | | | | | | | | |
Collapse
|
43
|
Huh YS, Park TJ, Yang K, Lee EZ, Hong YK, Lee SY, Kim DH, Hong WH. Advanced cleanup process of the free-flow microfluidic device for protein analysis. Ultramicroscopy 2008; 108:1365-70. [DOI: 10.1016/j.ultramic.2008.04.085] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
44
|
Huh YS, Choi JH, Park TJ, Hong YK, Hong WH, Lee SY. Microfluidic cell disruption system employing a magnetically actuated diaphragm. Electrophoresis 2008. [DOI: 10.1002/elps.200890057] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
45
|
Park H, Jung YM, You JK, Hong WH, Kim JN. Analysis of the CO2 and NH3 Reaction in an Aqueous Solution by 2D IR COS: Formation of Bicarbonate and Carbamate. J Phys Chem A 2008; 112:6558-62. [DOI: 10.1021/jp800991d] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- HoSeok Park
- Department of Chemical and Biomolecular Engineering (BK21 Program), KAIST, 373-1 Guseong-dong, Yusong-gu, Daejeon, Republic of Korea, Department of Chemistry, Kangwon National University, Chunchon 200-701, Republic of Korea, and Chemical Research Center, KIER, 71-2 Jang-dong, Yusong-gu, Daejeon, Republic of Korea
| | - Young Mee Jung
- Department of Chemical and Biomolecular Engineering (BK21 Program), KAIST, 373-1 Guseong-dong, Yusong-gu, Daejeon, Republic of Korea, Department of Chemistry, Kangwon National University, Chunchon 200-701, Republic of Korea, and Chemical Research Center, KIER, 71-2 Jang-dong, Yusong-gu, Daejeon, Republic of Korea
| | - Jong Kyun You
- Department of Chemical and Biomolecular Engineering (BK21 Program), KAIST, 373-1 Guseong-dong, Yusong-gu, Daejeon, Republic of Korea, Department of Chemistry, Kangwon National University, Chunchon 200-701, Republic of Korea, and Chemical Research Center, KIER, 71-2 Jang-dong, Yusong-gu, Daejeon, Republic of Korea
| | - Won Hi Hong
- Department of Chemical and Biomolecular Engineering (BK21 Program), KAIST, 373-1 Guseong-dong, Yusong-gu, Daejeon, Republic of Korea, Department of Chemistry, Kangwon National University, Chunchon 200-701, Republic of Korea, and Chemical Research Center, KIER, 71-2 Jang-dong, Yusong-gu, Daejeon, Republic of Korea
| | - Jong-Nam Kim
- Department of Chemical and Biomolecular Engineering (BK21 Program), KAIST, 373-1 Guseong-dong, Yusong-gu, Daejeon, Republic of Korea, Department of Chemistry, Kangwon National University, Chunchon 200-701, Republic of Korea, and Chemical Research Center, KIER, 71-2 Jang-dong, Yusong-gu, Daejeon, Republic of Korea
| |
Collapse
|
46
|
Huh YS, Choi JH, Park TJ, Hong YK, Hong WH, Lee SY. Microfluidic cell disruption system employing a magnetically actuated diaphragm. Electrophoresis 2008. [DOI: 10.1002/elps.200890038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
47
|
Huh YS, Choi JH, Huh KAK, Kim KA, Park TJ, Hong YK, Kim DH, Hong WH, Lee SY. Microfluidic cell disruption system employing a magnetically actuated diaphragm. Electrophoresis 2008; 28:4748-57. [PMID: 18008309 DOI: 10.1002/elps.200700366] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A microfluidic cell lysis chip equipped with a micromixer and SPE unit was developed and used for quantitative analysis of intracellular proteins. This miniaturized sample preparation system can be employed for any purpose where cell disruption is needed to obtain intracellular constituents for the subsequent analysis. This system comprises a magnetically actuated micromixer to disrupt cells, a hydrophobic valve to manipulate the cell lysate, and a packed porous polymerized monolith chamber for SPE and filtering debris from the cell lysate. Using recombinant Escherichia coli expressing intracellular enhanced green fluorescent protein (EGFP) and lipase as model bacteria, we optimized the cell disruption condition with respect to the lysis buffer composition, mixing time, and the frequency of the diaphragm in the micromixer, which was magnetically actuated by an external magnetic stirrer in the micromixer chamber. The lysed sample prepared under the optimal condition was purified by the packed SPE in the microfluidic chip. At a frequency of 1.96 Hz, the final cell lysis efficiency and relative fluorescence intensity of EGFP after the cell disruption process were greater than 90 and 94%, respectively. Thus, this microfluidic cell disruption chip can be used for the efficient lysis of cells for further analysis of intracellular contents in many applications.
Collapse
Affiliation(s)
- Yun Suk Huh
- Separation Process Laboratory, Department of Chemical and Biomolecular Engineering (BK21 program), Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
48
|
You JK, Park H, Yang SH, Hong WH, Shin W, Kang JK, Yi KB, Kim JN. Influence of Additives Including Amine and Hydroxyl Groups on Aqueous Ammonia Absorbent for CO2 Capture. J Phys Chem B 2008; 112:4323-8. [DOI: 10.1021/jp711113q] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jong Kyun You
- Department of Chemical and Biomolecular Engineering (BK21 Program) and Department of Materials Science and Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea, and Chemical Process Research Center, KIER 71-2 Jang-dong, Yuseong-gu, Daejeon, Republic of Korea
| | - HoSeok Park
- Department of Chemical and Biomolecular Engineering (BK21 Program) and Department of Materials Science and Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea, and Chemical Process Research Center, KIER 71-2 Jang-dong, Yuseong-gu, Daejeon, Republic of Korea
| | - Seong Ho Yang
- Department of Chemical and Biomolecular Engineering (BK21 Program) and Department of Materials Science and Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea, and Chemical Process Research Center, KIER 71-2 Jang-dong, Yuseong-gu, Daejeon, Republic of Korea
| | - Won Hi Hong
- Department of Chemical and Biomolecular Engineering (BK21 Program) and Department of Materials Science and Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea, and Chemical Process Research Center, KIER 71-2 Jang-dong, Yuseong-gu, Daejeon, Republic of Korea
| | - Weonho Shin
- Department of Chemical and Biomolecular Engineering (BK21 Program) and Department of Materials Science and Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea, and Chemical Process Research Center, KIER 71-2 Jang-dong, Yuseong-gu, Daejeon, Republic of Korea
| | - Jeung Ku Kang
- Department of Chemical and Biomolecular Engineering (BK21 Program) and Department of Materials Science and Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea, and Chemical Process Research Center, KIER 71-2 Jang-dong, Yuseong-gu, Daejeon, Republic of Korea
| | - Kwang Bok Yi
- Department of Chemical and Biomolecular Engineering (BK21 Program) and Department of Materials Science and Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea, and Chemical Process Research Center, KIER 71-2 Jang-dong, Yuseong-gu, Daejeon, Republic of Korea
| | - Jong-Nam Kim
- Department of Chemical and Biomolecular Engineering (BK21 Program) and Department of Materials Science and Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea, and Chemical Process Research Center, KIER 71-2 Jang-dong, Yuseong-gu, Daejeon, Republic of Korea
| |
Collapse
|
49
|
|
50
|
Park J, Park SB, Yang SM, Hong WH, Choi CR, Kim JH. Rheological Characterization of Suspension and Gel Prepared from Colloidal Silica for Sealed Lead-Acid Batteries by Small Amplitude Dynamic Oscillation Measurement. J Chem Eng Japan / JCEJ 2008. [DOI: 10.1252/jcej.04e137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jin Park
- Department of Chemical and Biomolecular Engineering, and Center for Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology
| | - Seung Bin Park
- Department of Chemical and Biomolecular Engineering, and Center for Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology
| | - Seung-Man Yang
- Department of Chemical and Biomolecular Engineering, and Center for Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology
| | - Won Hi Hong
- Department of Chemical and Biomolecular Engineering, and Center for Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology
| | | | | |
Collapse
|