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A 3D networked polydiacetylene sensor for enhanced sensitivity
Lee, Soobum,Lee, Joosub,Lee, Dong Wook,Kim, Jong-Man,Lee, Haiwon The Royal Society of Chemistry 2016 Chemical communications Vol.52 No.5
<P>A three order sensitivity enhancement over a 2D system was achieved with a polydiacetylene-immobilized 3D networked sensor matrix.</P>
Stimulus-Responsive Azobenzene Supramolecules: Fibers, Gels, and Hollow Spheres
Lee, Sumi,Oh, Seungwhan,Lee, Joosub,Malpani, Yashwardhan,Jung, Young-Sik,Kang, Baotao,Lee, Jin Yong,Ozasa, Kazunari,Isoshima, Takashi,Lee, Sang Yun,Hara, Masahiko,Hashizume, Daisuke,Kim, Jong-Man American Chemical Society 2013 Langmuir Vol.29 No.19
<P>Novel, stimulus-responsive supramolecular structures in the form of fibers, gels, and spheres, derived from an azobenzene-containing benzenetricarboxamide derivative, are described. Self-assembly of tris(4-((<I>E</I>)-phenyldiazenyl)phenyl)benzene-1,3,5-tricarboxamide (<B>Azo-1</B>) in aqueous organic solvent systems results in solvent dependent generation of microfibers (aq DMSO), gels (aq DMF), and hollow spheres (aq THF). The results of a single crystal X-ray diffraction analysis of <B>Azo-1</B> (crystallized from a mixture of DMSO and H<SUB>2</SUB>O) reveal that it possesses supramolecular columnar packing along the <I>b</I> axis. Data obtained from FTIR analysis and density functional theory (DFT) calculation suggest that multiple hydrogen bonding modes exist in the <B>Azo-1</B> fibers. UV irradiation of the microfibers, formed in aq DMSO, causes complete melting while regeneration of new fibers occurs upon visible light irradiation. In addition to this photoinduced and reversible phase transition, the <B>Azo-1</B> supramolecules display a reversible, fiber-to-sphere morphological transition upon exposure to pure DMSO or aq THF. The role played by amide hydrogen bonds in the morphological changes occurring in <B>Azo-1</B> is demonstrated by the behavior of the analogous, ester-containing tris(4-((<I>E</I>)-phenyldiazenyl)phenyl)benzene-1,3,5-tricarboxylate (<B>Azo-2</B>) and by the hydrogen abstraction in the presence of fluoride anions.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2013/langd5.2013.29.issue-19/la400159m/production/images/medium/la-2013-00159m_0013.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la400159m'>ACS Electronic Supporting Info</A></P>
A Magnetically Responsive Polydiacetylene Precursor for Latent Fingerprint Analysis
Lee, Joosub,Lee, Chan Woo,Kim, Jong-Man American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.9
<P>A magnetically responsive diacetylene (DA) powder was developed for the visualization of latent fingerprints. A mixture of the DA and magnetite nanoparticles, applied to a surface containing latent fingermarks, becomes immobilized along the ridge patterns of the fingerprints when a magnetic field is applied. Alignment along the ridge structures is a consequence of favorable hydrophobic interactions occurring between the long alkyl chains in the DAs and the lipid-rich, sebaceous latent fingermarks. UV irradiation of the DA magnetite composite immobilized on the latent fingerprint results in the generation of blue colored PDAs. Heat treatment of the blue-colored image promotes a blue-to-red transition as well as fluorescence turn-on. A combination of the aligned pale brown colored monomeric state, UV irradiation generated blue-colored PDA state, as well as the heat treatment generated red-colored and fluorescent PDA state enables efficient visual imaging of a latent fingerprint, which is deposited on various colored solid surfaces.</P>
Magnetically Responsive Inorganic/Polydiacetylene Nanohybrids
Lee, Joosub,Yoon, Bora,Ham, Dae‐,Young,Yarimaga, Oktay,Lee, Chan Woo,Jaworski, Justyn,Kim, Jong‐,Man WILEY‐VCH Verlag 2012 Macromolecular chemistry and physics Vol.213 No.9
<P><B>Abstract</B></P><P>A direct method for the generation of magnetically responsive conjugated polymer supramolecules is described. By immobilizing magnetite nanoparticles (MNP) on the surface of polydiacetylene (PDA) supramolecules, an inorganic/conjugated polymer hybrid system results that enables the incorporation of an important property (magnetism) to an attractive class of colorimetric PDA sensors. Benefits of this new system include: (1) ease of preparation, (2) variability in diacetylene labeling of MNPs, (3) diversity in conjugated PDA morphologies, (4) facile isolation process, and (5) immobilization of the PDA without altering the colorimetric (sensory) properties. It is demonstrated that PDA/MNP systems offer advantages in applications including film formation, separation, and sensing.</P>
A polymerizable supramolecular approach for the fabrication of patterned magnetic nanoparticles
Lee, Joosub,Seo, Ki-Seung,Lee, Chan Woo,Kim, Jong-Man The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.53
<P>A simple and highly effective method for the fabrication of patterned magnetic nanoparticles was developed. The procedure utilizes a UV irradiation-wet etching-calcination sequence starting with a magnetic nanoparticle embedded polymerizable diacetylene film.</P> <P>Graphic Abstract</P><P>A straightforward method for the preparation of patterned magnetite nanoparticles (MNPs) was developed. The polymerizable supramolecular approach afforded finely patterned MNPs on a solid substrate after a sequential UV-irradiation-wet etching-calcination process with an MNP-embedded diacetylene film. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cc02873f'> </P>
ATSC 지상파 DTV 방송신호의 방송프로그램 ID 삽입 및 추출
김주섭(Joosub Kim),추현곤(Hyon-Gon Choo),김병선(ByungSun Kim),이상규(Sang-Gyou Lee),김성환(Sunghwan Kim),송주호(Joo Ho Song),남제호(Jeho Nam) 한국방송·미디어공학회 2008 한국방송공학회 학술발표대회 논문집 Vol.2008 No.-
본 논문에서는 ATSC 기반 국내 지상파 DTV 방송신호를 대상으로 ATSC A/65c(Program and System Information Protocol; PSIP) 및 A/57b(Content Identification and Labeling for ATSC Transport) 표준규격 기반의 방송프로그램ID 규격을 제안한다. 특히, 현재 방송사 내부적으로 운영되고 있는 콘텐츠 식별관리 방식의 독자성을 유지하고, 지상파방송 서비스 환경의 특수성을 반영한 지상파 방송프로그램 식별정보인 방송프로그램ID 구조를 제시한다. 또한 방송프로그램ID 삽입/추출기의 구현 및 실험과정을 통하여, 국내 지상파 DTV 방송 송수신규격과의 정합 및 방송프로그램ID의 기능 검증을 수행한다.
Harjanto, Dewi,Lee, Joosub,Kim, Jong-Man,Jaworski, Justyn American Chemical Society 2013 Langmuir Vol.29 No.25
<P>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.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2013/langd5.2013.29.issue-25/la4005714/production/images/medium/la-2013-005714_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la4005714'>ACS Electronic Supporting Info</A></P>
Sweat pore mapping using a fluorescein–polymer composite film for fingerprint analysis
Pyo, Minkyeong,Lee, Joosub,Baek, Woohyun,Lee, Chan Woo,Park, Bum Jun,Kim, Jong-Man The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.15
<P>A simple but efficient sweat pore mapping method based on a fluorescein–PVP composite film was developed for fingerprint analysis. The composite film displays a fluorometric turn-on response upon contact with a small quantity of water secreted from human sweat pores, allowing precise mapping of sweat pores on a fingertip.</P> <P>Graphic Abstract</P><P>A simple but efficient sweat pore mapping method based on a fluorescein–PVP composite film was developed for fingerprint analysis. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc09085c'> </P>
Sweat Pore Mapping Using Hydrophilic Polymer Films
Pyo, Minkyeong,Lee, Joosub,Baek, Woohyun,Lee, Chan Woo,Park, Bum Jun,Kim, Jong-Man American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.12
<P>In this study, we present a simple method for mapping sweat pores using a water-soluble polymer matrix film. Local adsorption of sub-nanoliter water secreted from sweat pores on human fingertips creates discrete microdimples on the hydrophilic polymer film. These microdimples can be readily visualized by a conventional optical microscope. This new method offers a promising route to enable mass production of sweat pore detection films by inexpensive means. Ultimately, this method has the potential feasibility of use in various personal identification applications and biomedical applications for clinical diagnosis of malfunctioning sweat pores.</P>