Jong-Man Kim

Hanyang University, Sŏul, Seoul, South Korea

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Publications (144)666.22 Total impact


  • No preview · Article · Feb 2016 · Macromolecules
  • Songa Chae · Jong Pil Lee · Jong-Man Kim
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    ABSTRACT: Recently, the development of directly writable techniques for depositing functional materials on solid substrates has received great attention. These pen-on-paper approaches enable generation of diverse patterned images on solid substrates in a flexible, easy handling, and inexpensive manner. Herein, the development of a directly writable conjugated polymer is described. Mechanically, drawable colorimetric polydiacetylene (PDA)–wax composites are readily fabricated by using a simple mixing-molding method. Images are mechanically drawn on a paper substrate using the PDA–wax composites, display thermochromism, and mechanothermochromism. The thermochromic transition temperature is dependent on the melting point of the wax and, as a result, can be precisely controlled by the type of wax used. Optical microscopic analysis shows that formation of the DA–wax composite involves movement of wax molecules into a single diacetylene (DA) crystal. This process results in growth of the crystal. Importantly, the PDA crystal, obtained after UV light irradiation, undergoes significant shrinkage upon heating because of the release of monomers and the embedded wax molecules from the crystal. The release of these molecules creates void in the PDA supramolecules, allowing the PDA chains to undergo C–C bond rotation and hence the blue-to-red color transition.
    No preview · Article · Feb 2016 · Advanced Functional Materials
  • Seongho Jeon · Sumin Park · Jihye Nam · Youngjong Kang · Jong-Man Kim
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    ABSTRACT: Fabrication of patterned conjugated polymer images on solid substrate has gained significant attention. Office inkjet printers afford flexible design and fabrication of functional materials on a large-scale and in an inexpensive manner. Although patterning of conjugated polymers on paper using common office inkjet printers have been reported, it has been limited to few examples such as polyaniline (PANI) and poly(3,4-ethylenedioxythiophene) (PEDOT) since only water compatible inks are allowed. Herein, we report fabrication of poly(phenylene vinylene) (PPV) patterns on paper by employing a reactive inkjet printing (RIP) method. Inkjet printing of a hydrophilic terephthaldehyde, bis(triphenyl phosphonium salt) and potassium t-butoxide using a common office inkjet printer allowed efficient fabrication of PPV patterns via in-situ Wittig reaction. In addition, microarrayed PPV patterns were also readily achieved on solid substrates such as glass and PDMS substrates when a piezoelectric dispenser system was employed. The in-situ prepared PPV was found to be insoluble in water and chloroform, thus it allowed efficient removal of unreacted excess reagents and by-products.
    No preview · Article · Jan 2016 · ACS Applied Materials & Interfaces
  • Kyungchan Uh · Bora Yoon · Chan Woo Lee · Jong-Man Kim
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    ABSTRACT: Electroactive materials that change shape in response to electrical stimulation can serve as actuators. Electroactive actuators of this type have great utility in a variety of technologies including biomimetic artificial muscles, robotics and sensors. Electroactive actuators developed to date often suffer from problems associated with the need to use electrolytes, slow response times, high driving voltages and short cycle lifetimes. Herein, we report an electrolyte-free, single component, polymer electroactive actuator, which has a fast response time, high durability and requires a low driving voltage (<5 V). The process employed for production of this material involves wet-spinning of a pre-organized camphorsulfonic acid (CSA) doped polyaniline (PANI) gel, which generates long, flexible and conductive (ca. 270 S/cm) microfibers. Reversible bending motions take place upon application of an alternating current (AC) to the PANI polymer. This motion, promoted by a significantly low driving voltage (<0.5 V) in the presence of an external magnetic field, has a very rapid swinging speed (9000 swings/minute) that lies in the range of those of flies and bees (1000-15000 swings/min), and it is fatigue-resistant (> one million cycles).
    No preview · Article · Dec 2015 · ACS Applied Materials & Interfaces
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    ABSTRACT: Hydrochromic materials have a wide range of applications, including humidity sensing and measurement of water content in organic solvents, as well as as substrates for rewritable paper and sweat pore mapping. On page 498, B. J. Park, J.-M. Kim and co-workers report an printable monomer that can be transformed to a hydrochromic conjugated polymer on conventional paper. The printed image undergoes a fluorescence ‘turn on’ feature upon exposure to water.
    No preview · Article · Dec 2015 · Advanced Functional Materials
  • Soobum Lee · Joosub Lee · Dong Wook Lee · Jong-Man Kim · Haiwon Lee
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    ABSTRACT: A three order sensitivity enhancement over a 2D system was achieved with a polydiacetylene-immobilized 3D networked sensor matrix.
    No preview · Article · Nov 2015 · Chemical Communications
  • 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.
    No preview · Article · May 2015 · Chemical Communications
  • 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.
    No preview · Article · Apr 2015 · Macromolecular Rapid Communications
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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.
    No preview · Article · Mar 2015 · ACS Applied Materials & Interfaces
  • Source
    Junho Lee · Seunghwan Oh · Jaeyeon Pyo · Jong-Man Kim · Jung Ho Je
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    ABSTRACT: A single photomechanical supramolecular nanowire actuator with an azobenzene-containing 1,3,5-tricarboxamide derivative is developed by employing a direct writing method. Single nanowires display photoinduced reversible bending and the bending behavior follows first-order kinetics associated with azobenzene photoisomerization. A wireless photomechanical nanowire tweezers that remotely manipulates a single micro-particle is also demonstrated.
    Preview · Article · Mar 2015 · Nanoscale
  • 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.
    No preview · Article · Feb 2015
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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.
    Preview · Article · Jan 2015 · Chemical Communications
  • Jung Lee · Jong-Man Kim

    No preview · Article · Nov 2014 · Bulletin- Korean Chemical Society
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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.
    No preview · Article · Nov 2014 · Sensors and Actuators B Chemical
  • 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.
    No preview · Article · Oct 2014 · Journal of Nanoscience and Nanotechnology
  • 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.
    No preview · Article · Aug 2014 · Colloids and surfaces B: Biointerfaces

  • No preview · Article · Aug 2014 · Bulletin- Korean Chemical Society
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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.
    No preview · Article · Aug 2014 · Advanced Materials
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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.
    No preview · Article · Jul 2014 · ACS Applied Materials & Interfaces
  • Source
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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.
    Full-text · Article · Apr 2014 · Nature Communications

Publication Stats

3k Citations
666.22 Total Impact Points

Institutions

  • 2001-2016
    • 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
  • 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