Jong-Man Kim

Hanyang University, Sŏul, Seoul, South Korea

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Publications (137)607.59 Total impact

  • Joosub Lee · Ki-Seung Seo · Chan Woo Lee · Jong-Man Kim
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    ABSTRACT: Owing to the relative ease of preparation, facile surface modification, and good magnetic property, magnetite-based functional nanoparticles have been extensively investigated in the context of applications to the areas of sensing, imaging, separation and purification. Conventional magnetite pattering methods either require tedious steps and/or suffer from poor resolution. We have developed a very straightforward method for the preparation of patterned magnetite nanoparticles (MNPs). The polymerizable supramolecular approach afforded finely patterned MNPs on a solid substrate after a sequential UV-irradiation-wet etching-calcination process with a MNP-embedded diacetylene film. The patterning process can be readily monitored by the naked eye since each step yields a distinct color corresponding to the polydiacetylene (PDA) (blue and red) and MNP (yellow-brown). The thickness of the MNP film can be also readily manipulated by controlling the amount of NMP employed. The methodology described in the manuscript should be applicable to other metallic nanoparticles.
    Chemical Communications 05/2015; 51(53). DOI:10.1039/C5CC02873F · 6.83 Impact Factor
  • Imsung Yoo · Simon Song · Kyungchan Uh · Chan Woo Lee · Jong-Man Kim
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    ABSTRACT: Owing to the relatively high conductivity and unique redox behavior, polyaniline (PANI) has been one of the most technologically promising conducting polymers. Although various methodologies have been developed, fabrication of PANI microfibers has been a challenging task owing to the poor solubility in most organic solvents. By taking advantage of a microfluidic technology and organic soluble acid labile t-Boc-protected PANI (t-Boc-PANI) as the conducting polymer precursor, fabrication of PANI microfibers in a size-controlled manner is possible. Introduction of a THF solution containing t-Boc-PANI, and dodecylbenzenesulfonic acid (DBSA) as a core flow, and water as a sheath flow into a microfluidic channel with a 3D hydrodynamic focusing effect results in crystallization of the polymer fiber. By changing the flow rate, linear PANI microfibers that range from 16.2 to 39.4 μm in diameter are readily obtained. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Macromolecular Rapid Communications 04/2015; 36(13). DOI:10.1002/marc.201500068 · 4.94 Impact Factor
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    ABSTRACT: Rational design of a hydrocarbon sensor that enables visual differentiation of saturated aliphatic hydrocarbons (SAHCs) is very difficult owing to the lack of useful functional groups that can interact with the sensor system. Here, we report a microbead embedded with polydiacetylene that undergoes faster swelling and faster blue-to-red color change in response to the hydrocarbons of shorter alkyl chains. Accordingly, visual differentiation among n-pentane, n-heptane, n-nonane and n-undecane was readily achieved. By taking advantage of the collective effect, construction of a sensor system with amplified response was possible. Combination of microfluidic technology (for bead preparation), PDMS (swellable polymeric matrix) and polydiacetylene (colorimetric material) were key to enable this unique hydrocarbon sensor.
    ACS Applied Materials & Interfaces 03/2015; 7(15). DOI:10.1021/acsami.5b02341 · 6.72 Impact Factor
  • Seongho Jeon · Jong Pil Lee · Jong-Man Kim
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    ABSTRACT: Preparation of solid-state luminescent organic materials based on a reactive inkjet printing method is described. Although the reactive inkjet printing technique has been applied to the preparation of functional organic materials, in-situ synthesis of conjugated organic compounds by employing condensation reaction has never been explored. We have demonstrated that a vapor and heat responsive fluorescent cyano-stilbene derivative can be readily prepared by this method. Furthermore, a luminescent conjugated polymer was straightforwardly synthesized on glass substrate and flexible PDMS films by taking advantage of the reactive inkjet printing method.
    02/2015; 3(12). DOI:10.1039/C5TC00334B
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    ABSTRACT: Fingerprint analysis serves as one of the most reliable methods for personal authentification. The vast majority of fingerprint analyses are based on ridge structures on fingertips. Herein, we present the results of studies leading to development of a widely applicable sweat pore mapping system that also can be used for personal authentification. The new system utilizes a small molecule-polymer composite film and fluorescein as a water-sensitive probe molecule that fluoresces in the presense of tiny amounts of sweat. The hydrophilic polymer matrix, polyvinylpyrrolidone (PVP), is employed to effectively capture the aqueous components in sweat. The fluorescein-PVP composite film enables excellent fluorescence mapping of sweat pores on a fingertip. Matching of the sweat pore map obtained in this manner with latent fingermarks enables an accurate identification of individuals.
    Chemical Communications 01/2015; 51(15). DOI:10.1039/C4CC09085C · 6.83 Impact Factor
  • Jung Lee · Jong-Man Kim
    Bulletin- Korean Chemical Society 11/2014; 35(11):3381-3384. DOI:10.5012/bkcs.2014.35.11.3381 · 0.80 Impact Factor
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    ABSTRACT: Low temperature reactive plasmas have been widely used in various nanofabrication processes. We have developed a large area wafer-type colorimetric plasma diagnostic system based on a polymerizable supramolecular sensor (PSS). The supramolecular diacetylene based PSS allows efficient mapping of the ion density distribution. The colour change of the thin PSS film was found to be very sensitive to plasma and afforded a real time colorimetric and fluorometric monitoring of spatial ion density distribution. This PSS method, which does not require electrical circuits and batteries, will find great utility in the field of plasma diagnostics.
    Sensors and Actuators B Chemical 11/2014; 203:130–134. DOI:10.1016/j.snb.2014.06.098 · 4.10 Impact Factor
  • Sumi Lee · In Sung Park · Young-Sik Jung · Jong-Man Kim
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    ABSTRACT: A biphenyl derivative containing two D-Ala-D-Ala moieties was found to form fluorescent nano/microfibers when subjected to self-assembly conditions in aqueous EtOH. Incubation of the nano/microfibers with vancomycin results in the disappearance of the fibers along with a significant decrease in the fluorescence intensity. The detection limit of vancomycin determined by the fluorescence quenching strategy was calculated to be ca. 57 μM. Regeneration of the original fiber structures were obtained in the presence of Ac-Lys(Ac)-D-Ala-D-Ala, a substance known to bind tightly to vancomycin. Other proteins including bovine serum albumin (BSA), casein, elastase, and chymotrypsin were found to cause no morphological and fluorescence changes in the supramolecules. The unique vancomycin-induced phase transition and fluorescence change were not observed with a biphenyl derivative having L-Ala-L-Ala moiety.
    Journal of Nanoscience and Nanotechnology 10/2014; 14(10). DOI:10.1166/jnn.2014.9413 · 1.56 Impact Factor
  • Suji Ahn · Seongho Jeon · Eun-A Kwak · Jong-Man Kim · Justyn Jaworski
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    ABSTRACT: An essential requirement for continued technological advancement in many areas of biology, physics, chemistry, and materials science is the growing need to generate custom patterned materials. Building from recent achievements in the site-specific modification of virus for covalent surface tethering, we show in this work that stable 2D virus patterns can be generated in custom geometries over large area glass surfaces to yield templates of biological, biochemical, and inorganic materials in high density. As a nanomaterial building block, filamentous viruses have been extensively used in recent years to produce materials with interesting properties, owing to their ease of genetic and chemical modification. By utilizing un-natural amino acids generated at specific locations on the filamentous fd bacteriophage protein coat, surface immobilization is carried out on APTES patterned glass resulting in precise geometries of covalently linked virus material. This technique facilitated the surface display of a high density of virus that were labeled with biomolecules, fluorescent probes, and gold nanoparticles, thereby opening the possibility of integrating virus as functional components for surface engineering.
    Colloids and surfaces B: Biointerfaces 08/2014; 122. DOI:10.1016/j.colsurfb.2014.08.019 · 4.15 Impact Factor
  • Bulletin- Korean Chemical Society 08/2014; 35(8):2563-2566. DOI:10.5012/bkcs.2014.35.8.2563 · 0.80 Impact Factor
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    ABSTRACT: Fabrication of 3D biological structures reveals dynamic response to external stimuli. A liquid-crystalline bridge extrusion technique is used to generate 3D structures allowing the capture of Rayleigh-like instabilities, facilitating customization of smooth, helical, or undulating periodic surface textures. By integrating intrinsic biochemical functionality and synthetic components into controlled structures, this strategy offers a new form of adaptable materials.
    Advanced Materials 08/2014; 26(30). DOI:10.1002/adma.201401768 · 17.49 Impact Factor
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    ABSTRACT: A challenge in developing photovoltaic devices is to minimize the loss of electrons, which can seriously deteriorate energy conversion efficiency. In particular, minimizing this negative process in dye-sensitized solar cells (DSCs) is imperative. Herein, we use three different kinds of siloxanes, which are adsorbable to titania surfaces and polymerizable in forming a surface passivation layer, to reduce the electron loss. The siloxanes used are tetraethyl orthosilicate (TEOS or compound A), 1-(3-(1H-imidazol-1-yl)propyl)-3-(3-triethoxysilyl) propyl) urea (compound B), and N-(3-triethoxysilylpropyl)-N'[3-(3-methyl-1H-imidazol-3-ium) propyl] urea iodide (compound C). Titania surface passivation by either compound B or C was comparatively more effective in increasing the electron lifetime than TEOS. In the case of small-sized TEOS combined with either large-sized compound B or C, a thinner and denser passivation layer was presumably developed, thus increasing electron lifetime further. Intriguingly, device AB shows the longest electron lifetime, whereas device AC has the highest energy-conversion efficiency among these experimental conditions. These results suggest that, in this special case, the electron lifetime may not be a dominant parameter in determining the energy conversion efficiency.
    ACS Applied Materials & Interfaces 07/2014; 6(15). DOI:10.1021/am502327w · 6.72 Impact Factor
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    ABSTRACT: Hydrochromic materials have been actively investigated in the context of humidity sensing and measuring water contents in organic solvents. Here we report a sensor system that undergoes a brilliant blue-to-red colour transition as well as 'Turn-On' fluorescence upon exposure to water. Introduction of a hygroscopic element into a supramolecularly assembled polydiacetylene results in a hydrochromic conjugated polymer that is rapidly responsive (<20 μs), spin-coatable and inkjet-compatible. Importantly, the hydrochromic sensor is found to be suitable for mapping human sweat pores. The exceedingly small quantities (sub-nanolitre) of water secreted from sweat pores are sufficient to promote an instantaneous colorimetric transition of the polymer. As a result, the sensor can be used to construct a precise map of active sweat pores on fingertips. The sensor technology, developed in this study, has the potential of serving as new method for fingerprint analysis and for the clinical diagnosis of malfunctioning sweat pores.
    Nature Communications 04/2014; 5:3736. DOI:10.1038/ncomms4736 · 11.47 Impact Factor
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    ABSTRACT: A highly sensitive, tunable, flexible and microfluidic compatible gas sensor was developed based on a photochromic spiropyran-embedded PDMS composite.
    Chemical Communications 03/2014; 50(32). DOI:10.1039/c4cc00567h · 6.83 Impact Factor
  • Hyora Shin · Bora Yoon · In Sung Park · Jong-Man Kim
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    ABSTRACT: An electrothermochromic paper display composed of colorimetrically reversible polydiacetylenes (PDAs), utilizing screen printing on photopaper and patterning of electrically conductive wires on the reverse side, was developed. Heat generated by passing a current through the wires on the back of the photopaper induced a blue-to-red color transition of the PDA on the front at regions corresponding to the wires. This resulted in the generation of red-colored images, which disappeared when the supplied electric current was removed. The voltage at which the PDAs changed color could be controlled by using structured diacetylene (DA) monomers. A PDA-based seven-segment display has also been developed. By applying voltages, red-colored numeric digits from 0 to 9 can be displayed on the surface of the PDA layer.
    Nanotechnology 02/2014; 25(9):094011. DOI:10.1088/0957-4484/25/9/094011 · 3.82 Impact Factor
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    ABSTRACT: Tetraethyl orthosilicate (TEOS) is employed as an equilibrium shifting agent for the esterification reaction between the carboxylic acid of the amphiphilic Z907 dye and Ti-OH on the mesoscopic TiO2 surface in dye-sensitized solar cells (DSCs). We demonstrate that TEOS treatment of the Z907-dyed TiO2 film increases the amount of strongly anchored dyes, and also improves the electron diffusion length (Ln). Consequently, the cell provides a remarkable short-circuit current density (Jsc) enhanced by 22% (9.0 → 11.0 mA cm−2) and the total power conversion efficiency increased by 14% (4.9 → 5.6%) under 1 sun (AM 1.5, 100 mW cm−2), even with less than half the amount of adsorbed dye as compared to the reference. Therefore, TEOS treatment seems to be effective in increasing the power conversion efficiency along with increasing the concentration of the strongly anchored dye, specifically when using an amphiphilic dye such as Z907.
    01/2014; 2(7). DOI:10.1039/C3TA13152A
  • Chiho Song · John A. Rogers · Jong-Man Kim · Heejoon Ahn
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    ABSTRACT: Electrohydrodynamic (EHD) jet printing is a direct-writing technique which ejects ink through a fine nozzle using an electric field, which has the advantages of high-resolution, rapid printing speed and a wide range of ink selectivity. In this article, the EHD jet printing system is utilized to print patterns of polystyrene (PS) nanofibers. The effect of parameters such as ink concentration, working distance, applied voltage, and stage speed on the diameter of the printed nanofibers was investigated. The EHD jet printing technology is further utilized to print various patterns of polydiacetylene (PDA)-embedded PS nanofibers. The EHD jet printing based nanofiber printing is advantageous over conventional electrospining based approaches in terms of patterned PDA images. In addition, an advanced EHD jet printing system which is adopted for aligned nanofiber printing will expand the application of nanofibers from bio and chemical sensors to tissue engineering and electronics.
    Macromolecular Research 01/2014; 23(1):118-123. DOI:10.1007/s13233-015-3024-2 · 1.60 Impact Factor
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    Jung Lee · Hyun Taek Chang · Hyosung An · Sora Ahn · Jina Shim · Jong-Man Kim
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    ABSTRACT: As they have been designed to undergo colorimetric changes that are dependent on the polarity of solvents, the majority of conventional solvatochromic molecule based sensor systems inevitably display broad overlaps in their absorption and emission bands. As a result, colorimetric differentiation of solvents of similar polarity has been extremely difficult. Here we present a tailor-made colorimetric and fluorescence turn-on type solvatochromic sensor that enables facile identification of a specific solvent. The sensor system displays a colorimetric transition only when a thin protective layer, which protects the solvatochromic materials, is destroyed or disrupted by a specific solvent. The versatility of the strategy is demonstrated by designing a sensor that differentiates chloroform and dichloromethane colorimetrically and one that performs sequence selective colorimetric sensing. In addition, the approach is employed to construct a solvatochromic molecular AND logic gate. The new strategy could open new avenues for the development of novel solvatochromic sensors.
    Nature Communications 09/2013; 4:2461. DOI:10.1038/ncomms3461 · 11.47 Impact Factor
  • In Sung Park · Hye Jin Park · Jong-Man Kim
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    ABSTRACT: The majority of polydiacetylenes (PDAs) described to date display thermochromic transitions above room temperature. By following a strategy that employs headgroups that do not participate in strong interactions, we have designed and prepared a liquid diacetylene (DA) monomer that solidifies at a temperature near 0 °C. The isocyanate-containing DA monomer, DA-NCO, having this property does not undergo polymerization in its liquid state at room temperature. However, UV irradiation of frozen DA-NCO at 0 °C causes the instantaneous formation of a blue PDA (PDA-NCO). Interestingly, PDA-NCO was found to display a sharp blue-to-red color transition at a temperature near 11 °C. By taking advantage of its room temperature liquid-phase property, we were able to readily transfer the DA monomer to solid substrates by using common stamping and writing methods used for creating patterned PDA images. In addition, PDA-NCO dissolves in chloroform, giving a yellow solution that becomes red and simultaneously generates polymer aggregates when hexane is added. Finally, the isocyanate moieties present in PDA-NCO have been utilized to differentiate 1° from 2° and 3° amines owing to the fact that a chloroform solution of PDA-NCO undergoes a rapid yellow-to-red color change associated with an insoluble urea-forming reaction with primary amines.
    ACS Applied Materials & Interfaces 08/2013; 5(17). DOI:10.1021/am402701n · 6.72 Impact Factor
  • Dewi Harjanto · Joosub Lee · Jong-Man Kim · Justyn Jaworski
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    ABSTRACT: Biological systems provide us with a diverse source of peptide-based ligands for cellular adhesion. Controlling and assessing the ligand surface density as well as tailoring the surface chemistry to have specific cellular adhesion properties are important in biomaterials design. In the following work, we provide a means for displaying peptide-based ligands on magnetic liposomes in which the surface density and chemistry may be controlled. Simultaneously, the conjugated vesicles provide a fluorescent signal for examining steric hindrance among surface ligands. In addition, the inherent magnetic and fluorescence features of this system revealed potential for magnet-based cell isolation and fluorescent labeling of adhered cells, respectively. Adhered cells were found to remain viable and proliferative, thereby allowing them to be used for subsequent evaluation. In a specific demonstration, we control the density of fibronectin-mimetic ligands on the polydiacetylene liposome surfaces. We find that steric limitation occurring at over 20% surface density result in decreased cell adhesion, in accord with related techniques. The magnetic-liposome system offers the means for not only separating cells adhered to the biomaterial but also providing the ability to control and assess the biomaterial surface. This may prove particularly useful for examining combinations of peptide-based ligands or for evaluating the molecular-level ligand accessibility and its effect on cell attachment to a biomaterial surface.
    Langmuir 05/2013; 29(25). DOI:10.1021/la4005714 · 4.46 Impact Factor

Publication Stats

2k Citations
607.59 Total Impact Points


  • 2001–2015
    • Hanyang University
      • • Division of Chemical Engineering and Bioengineering
      • • College of Engineering
      Sŏul, Seoul, South Korea
    • Heinrich-Heine-Universität Düsseldorf
      • Institut für Organische Chemie und Makromolekulare Chemie
      Düsseldorf, North Rhine-Westphalia, Germany
  • 2011
    • Korea Advanced Institute of Science and Technology
      • Department of Electrical Engineering
      Seoul, Seoul, South Korea
  • 2006–2007
    • Kyungpook National University
      • School of Computer Science and Engineering
      Daikyū, Daegu, South Korea
  • 1998–2007
    • Korea Institute of Science and Technology
      • Center for Biomaterials
      Sŏul, Seoul, South Korea
  • 2000
    • Sungkyunkwan University
      • Department of Polymer Science and Engineering
      Sŏul, Seoul, South Korea