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  1. Article ; Online: Heat-Induced Dry Hydrolysis of Sodium Borohydride/Oxalic Acid Dihydrate Composite for Hydrogen Production

    Seunghun Shin / Yunkyeong Kim / Joon-Hyung Jin / Jihoon Jung

    ACS Omega, Vol 7, Iss 1, Pp 979-

    2021  Volume 986

    Keywords Chemistry ; QD1-999
    Language English
    Publishing date 2021-12-01T00:00:00Z
    Publisher American Chemical Society
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Enhanced Stability and Amplified Signal Output of Single-Wall Carbon Nanotube-Based NH 3 -Sensitive Electrode after Dual Plasma Treatment

    Joon Hyub Kim / Joon-Hyung Jin / Nam Ki Min

    Nanomaterials, Vol 10, Iss 1026, p

    2020  Volume 1026

    Abstract: Pristine nanomaterials are normally prepared using finely controlled fabrication processes. Because no imperfect nanostructure remains, they cannot be used directly as electrode substrates of functional devices. This is because perfectly organized ... ...

    Abstract Pristine nanomaterials are normally prepared using finely controlled fabrication processes. Because no imperfect nanostructure remains, they cannot be used directly as electrode substrates of functional devices. This is because perfectly organized nanostructures or nanomaterials commonly require posttreatment to generate intentionally, the kinds of desirable defects inside or on their surfaces that enable effective functionalization. Plasma treatment is an easier, simpler and more widely used way (relative to other methods) to modify a variety of nanomaterials, although plasma-functionalized nano surfaces commonly have a short lifetime. We present herein a dual plasma treatment (DPT) that significantly enhances the degree and lifetime of plasma-induced surface functional groups on single-walled carbon nanotubes (SWCNTs). The DPT process consists of two individually optimized oxygen–plasma treatments. The DPT-modified SWCNT functioned as a sensing material for ammonia gas for more than a month. It also provided more than three times the degree of functionality for amplified signal output than with a single-plasma-treated SWCNT electrode.
    Keywords dual plasma treatment ; oxygen plasma ; self-healing ; single-walled carbon nanotube ; surface functionalization ; Chemistry ; QD1-999
    Language English
    Publishing date 2020-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article: Experimental investigation for reverse heat transfer in structural fire-protective clothing

    Lee, Duck Weon / Eunae Kim / Joon-Hyung Jin / Junghan Lee

    Textile research journal. , v. 88, no. 5

    2018  

    Abstract: Structural fire-protective clothing must be effective at minimizing the thermal effects of fire. However, water remaining on the outer shell might play an important role in conducting heat transfer, which causes skin burns in a firefighter when he douses ...

    Abstract Structural fire-protective clothing must be effective at minimizing the thermal effects of fire. However, water remaining on the outer shell might play an important role in conducting heat transfer, which causes skin burns in a firefighter when he douses a fire with water through a hose. Therefore, this research demonstrated the difference in the heat transfer and humidity created by the remaining water or lack of water on the outer shell under a condition in which the temperature (45 ± 1°C) of the external environment was higher than that of the skin. Two types of multilayered systems, which simulated real fire-protective clothing (outer shell, moisture barrier, thermal liner) were tested by using a human–clothing–environment (HCE) simulator. The experimental results verified that water on the outer shell increased the microclimate temperature in the structural fire-protective clothing. In particular, we assume that air permeability in the outer shell can be an important factor to control heat and mass transfer within the microclimate.
    Keywords air ; clothing ; fabrics ; fire fighters ; heat transfer ; humidity ; mass transfer ; microclimate ; permeability ; temperature ; textile fibers
    Language English
    Dates of publication 2018-03
    Size p. 577-585.
    Publishing place SAGE Publications
    Document type Article
    ZDB-ID 2209596-2
    ISSN 1746-7748 ; 0040-5175
    ISSN (online) 1746-7748
    ISSN 0040-5175
    DOI 10.1177/0040517516685277
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Electrochemical serotonin monitoring of poly(ethylenedioxythiophene):poly(sodium 4-styrenesulfonate)-modified fluorine-doped tin oxide by predeposition of self-assembled 4-pyridylporphyrin

    Song, Min-Jung / Joon-Hyung Jin / Nam Ki Min / Sangsig Kim

    Biosensors & bioelectronics. 2014 Feb. 15, v. 52

    2014  

    Abstract: A 5,10,15,20-tetrakis(4-pyridyl)-21H,23H-porphyrin (TPyP)-modified self-assembled functional layer was prepared on a fluorine-doped tin oxide (FTO) substrate. We employed a bifunctional molecule, 3-iodopropionate (3IP), to covalently bind TPyP to the FTO ...

    Abstract A 5,10,15,20-tetrakis(4-pyridyl)-21H,23H-porphyrin (TPyP)-modified self-assembled functional layer was prepared on a fluorine-doped tin oxide (FTO) substrate. We employed a bifunctional molecule, 3-iodopropionate (3IP), to covalently bind TPyP to the FTO substrate. The 3IP-monolayered FTO and the TPyP–3IP-bilayered FTO electrodes were characterized by cyclic voltammetry, electrochemical impedance spectroscopy, and Fourier transform-infrared spectroscopy. Compared to conventional electropolymerized poly(ethylenedioxythiophene):poly(sodium 4-styrenesulfonate) (PEDOT:PSS) film on bare FTO, the PEDOT:PSS film on the TPyP–3IP-bilayered FTO showed better sensitivity and selectivity in monitoring serotonin in the presence of high concentrations of interfering agents such as ascorbic acid, urea, d-(+)-glucose, epinephrine, and l-3,4-dihydroxyphenylalanine. Both PEDOT:PSS films on the bare FTO and the TPyP–3IP-bilayered FTO showed electrocatalytic effects in serotonin detection, and only the TPyP–3IP-based PEDOT:PSS film acted as a pH resistant buffer layer in the selective detection of serotonin.
    Keywords ascorbic acid ; biosensors ; dielectric spectroscopy ; electrochemistry ; electrodes ; epinephrine ; Fourier transform infrared spectroscopy ; L-dopa ; monitoring ; oxides ; pH ; serotonin ; urea
    Language English
    Dates of publication 2014-0215
    Size p. 411-416.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1011023-9
    ISSN 1873-4235 ; 0956-5663
    ISSN (online) 1873-4235
    ISSN 0956-5663
    DOI 10.1016/j.bios.2013.08.040
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: A Comprehensive Review of Glucose Biosensors Based on Nanostructured Metal-Oxides

    Md. Mahbubur Rahman / A. J. Saleh Ahammad / Joon-Hyung Jin / Sang Jung Ahn / Jae-Joon Lee

    Sensors, Vol 10, Iss 5, Pp 4855-

    2010  Volume 4886

    Abstract: Nanotechnology has opened new and exhilarating opportunities for exploring glucose biosensing applications of the newly prepared nanostructured materials. Nanostructured metal-oxides have been extensively explored to develop biosensors with high ... ...

    Abstract Nanotechnology has opened new and exhilarating opportunities for exploring glucose biosensing applications of the newly prepared nanostructured materials. Nanostructured metal-oxides have been extensively explored to develop biosensors with high sensitivity, fast response times, and stability for the determination of glucose by electrochemical oxidation. This article concentrates mainly on the development of different nanostructured metal-oxide [such as ZnO, Cu(I)/(II) oxides, MnO2, TiO2, CeO2, SiO2, ZrO2, and other metal-oxides] based glucose biosensors. Additionally, we devote our attention to the operating principles (i.e., potentiometric, amperometric, impedimetric and conductometric) of these nanostructured metal-oxide based glucose sensors. Finally, this review concludes with a personal prospective and some challenges of these nanoscaled sensors.
    Keywords nanostructured metal-oxides ; glucose biosensor ; electrochemical principles ; enzymatic sensor ; nonenzymatic sensor ; Technology (General) ; T1-995 ; Technology ; T ; DOAJ:Technology (General) ; DOAJ:Technology and Engineering ; Analytical chemistry ; QD71-142 ; Chemistry ; QD1-999 ; Science ; Q ; DOAJ:Analytical Chemistry ; DOAJ:Chemistry
    Language English
    Publishing date 2010-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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