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Shim Jimin,Tawfik Salah M.,Thangadurai Daniel T.,Lee Yong‐Ill 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.7
The ability to detect pathogenic microbes in water and food samples is of prominent interest, but it remains a great challenge. Herein, we report a simple fluorescence sensor based on amphiphilic conjugated polythiophene (ACPT) for the detection of gram-negative pathogenic bacteria, Escherichia coli, in pH 7.0. The ACPT sensor was synthesized by the oxidative polymerization of water-soluble thiophene monomers in an aqueous solution. The ACPT sensor undergoes the fluorescence “turn on” response at 432 nm upon the addition of E. coli. The ionic complex, which is generated by electrostatic interaction during the short incubation time of 15 min, resulting in the enhancement of the fluorescence intensity of ACPT. The application of ACPT enables the detection of E. coli pathogens in tap water and milk samples with good recoveries of 96.94–100.83% and 93.27–116.75%, respectively, and excellent reproducibility (n = 3, relative standard deviation [RSD] = 1.78%). The current findings pave the way for the promising application of a novel ACPT system that could be used in food safety and environmental monitoring.
Shim, Jimin,Bae, Ki Yoon,Kim, Hee Joong,Lee, Jin Hong,Kim, Dong-Gyun,Yoon, Woo Young,Lee, Jong-Chan Wiley (John WileySons) 2015 ChemSusChem Vol.8 No.24
<P>Solid polymer electrolytes (SPEs) for all-solid-state lithium-ion batteries are prepared by simple one-pot polymerization induced by ultraviolet (UV) light using poly(ethylene glycol) methyl ether methacrylate (PEGMA) as an ion-conducting monomeric unit and tannic acid (TA)-based crosslinking agent and plasticizer. The crosslinking agent and plasticizer based on natural resources are obtained from the reaction of TA with glycidyl methacrylate and glycidyl poly(ethylene glycol), respectively. Dimensionally stable free-standing SPE having a large ionic conductivity of 5.6 x 10(-4) S cm(-1) at room temperature can be obtained by the polymerization of PEGMA into P(PEGMA) with a very small amount (0.1 wt%) of the crosslinking agent and 2.0 wt% of the plasticizer. The ionic conductivity value of SPE with a crosslinked structure is one order of magnitude larger than that of linear P(PEGMA) in the waxy state.</P>
Shim, Jimin,Kim, Dong-Gyun,Kim, Hee Joong,Lee, Jin Hong,Lee, Jong-Chan American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.14
<P>Core–shell silica particles with ion-conducting poly(ethylene glycol) and anion-trapping boron moiety in the shell layer were prepared to be used as fillers for polymer composite electrolytes based on organic/inorganic hybrid branched copolymer as polymer matrix for all-solid-state lithium-ion battery applications. The core–shell silica particles were found to improve mechanical strength and thermal stability of the polymer matrix and poly(ethylene glycol) and boron moiety in the shell layer increase compatibility between filler and polymer matrix. Furthermore, boron moiety in the shell layer increases both ionic conductivity and lithium transference number of the polymer matrix because lithium salt can be more easily dissociated by the anion-trapping boron. Interfacial compatibility with lithium metal anode is also improved because well-dispersed silica particles serve as protective layer against interfacial side reactions. As a result, all-solid-state battery performance was found to be enhanced when the copolymer having core–shell silica particles with the boron moiety was used as solid polymer electrolyte.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-14/acsami.5b00618/production/images/medium/am-2015-00618z_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b00618'>ACS Electronic Supporting Info</A></P>
Shim, Jimin,Lee, Jae Won,Bae, Ki Yoon,Kim, Hee Joong,Yoon, Woo Young,Lee, Jong-Chan Wiley (John WileySons) 2017 ChemSusChem Vol.10 No.10
<P>Lithium-metal anode has fundamental problems concerning formation and growth of lithium dendrites, which prevents practical applications of next generation of high-capacity lithium-metal batteries. The synergistic combination of solid polymer electrolyte (SPE) crosslinked with naturally occurring terpenes and lithium-powder anode is promising solution to resolve the dendrite issues by substituting conventional liquid electrolyte/separator and lithium-foil anode system. A series of SPEs based on polysiloxane crosslinked with natural terpenes are prepared by facile thiol-ene click reaction under mild condition and the structural effect of terpene crosslinkers on electrochemical properties is studied. Lithium powder with large surface area is prepared by droplet emulsion technique (DET) and used as anode material. The effect of the physical state of electrolyte (solid/liquid) and morphology of lithium-metal anode (powder/foil) on dendrite growth behavior is systematically studied. The synergistic combination of SPE and lithium-powder anode suggests an effective solution to suppress the dendrite growth owing to the formation of a stable solid-electrolyte interface (SEI) layer and delocalized current density.</P>
Correlation method for high speed size determination of nanoparticles using ICP-MS
Jimin Shim,Y. H. Park,H. B. Lim(임흥빈) 한국분석과학회 2021 학술대회논문집 Vol.2021 No.11
ICP-MS has a lot of potential to detect nanoparticles owing to its outstanding capability for reliable quantification, size distribution and particle concentration. Recently developed single particle ICP-MS (sp-ICP-MS) has been demonstrated remarkable performance to various fields with limited applications. The limitations are clear in the viewpoints of analytical figures-of-merits, i.e., lack of reliable information such as reproducible size distribution, particularly, for the sizes near quantification limit and low particle concentration, and requirement of many parameters to be experimentally determined or assumed. And those eventually make practical application difficult. In this concept, the size estimation model was recently developed in our lab and showed excellent demonstration for the nanoparticles of NIST standard Au, and SiO₂. The model established the correlation of the integrated area of the peak to the cubic of particle radius through the data treatment based on Window Peak Selection and Gauss Fitting. Since the model greatly relies on the trueness of the correlation curve, sample preparation, peak selection, and the fittings are carefully controlled throughout the data handling process. Finally, iron oxide (Fe₂O₃) nanoparticle was studied for further proof and practical application to semiconductor process. In summary, the developed method showed reliable performance for high speed analysis of nanoparticles which enable to do on-line monitoring of nanoparticles in the various manufacturing processes.
Shim, Jimin,Kim, Hee Joong,Kim, Byoung Gak,Kim, Yong Seok,Kim, Dong-Gyun,Lee, Jong-Chan The Royal Society of Chemistry 2017 ENERGY AND ENVIRONMENTAL SCIENCE Vol.10 No.9
<P>The multifunctional properties of 2D boron nitride nanoflakes (BNNFs) in gel polymer electrolytes (GPEs) are presented. A small addition (0.5 wt%) of BNNFs into the GPE substantially improves all the advantageous properties of the GPE including ionic conductivity, Li<SUP>+</SUP> transference number, mechanical modulus, and dendrite-suppressing capability, thereby enabling high performance lithium metal batteries.</P>
Shim, Jimin,Lee, Ji Su,Lee, Jin Hong,Kim, Hee Joong,Lee, Jong-Chan American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.41
<P>Gel polymer electrolytes (GPEs) based on semi-interpenetrating polymer network (IPN) structure for lithium-ion batteries were prepared by mixing boron-containing cross-linker (BC) composed of ethylene oxide (EO) chains, cross-linkable methacrylate group, and anion-trapping boron moiety with poly(vinylidene fluoride) (PVDF) followed by ultraviolet light-induced curing process. Various physical and electrochemical properties of the GPEs were systematically investigated by varying the EO chain length and boron content. Dimensional stability at high temperature without thermal shrinkage, if any, was observed due to the presence of thermally stable PVDF in the GPEs. GPE having 80 wt % of BC and 20 wt % of PVDF exhibited an ionic conductivity of 4.2 mS cm(-1) at 30 degrees C which is 1 order of magnitude larger than that of the liquid electrolyte system containing the commercial Celgard separator (0.4 mS cm(-1)) owing to the facile electrolyte uptake ability of EO chain and anion-trapping ability of the boron moiety. As a result, the lithium-ion battery cell prepared using the GPE with BC showed an excellent cycle performance at 1.0 C maintaining 87% of capacity during 100 cycles.</P>