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  1. Article ; Online: Electrospun Poly L-Lactic Acid Nanofiber Webs Presenting Enhanced Piezoelectric Properties.

    Hong, Seung Kwan / Lee, Jae-Jin / Kim, Kap Jin / Choi, Suk-Won

    Polymers

    2024  Volume 16, Issue 3

    Abstract: There has been extensive research on electrospun ferroelectric nanoparticle-doped poly L-lactic acid (PLA) nanofiber web piezoelectric devices. In this study, ... ...

    Abstract There has been extensive research on electrospun ferroelectric nanoparticle-doped poly L-lactic acid (PLA) nanofiber web piezoelectric devices. In this study, BaTiO
    Language English
    Publishing date 2024-01-28
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527146-5
    ISSN 2073-4360 ; 2073-4360
    ISSN (online) 2073-4360
    ISSN 2073-4360
    DOI 10.3390/polym16030347
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Publisher Correction: Electrospun PVDF/aromatic HBP of 4th gen based flexible and self‑powered TENG for wearable energy harvesting and health monitoring.

    Gunasekhar, Ramadasu / Reza, Mohammad Shamim / Kim, Kap Jin / Prabu, Arun Anand / Kim, Hongdoo

    Scientific reports

    2024  Volume 14, Issue 1, Page(s) 1683

    Language English
    Publishing date 2024-01-19
    Publishing country England
    Document type Published Erratum
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-024-52371-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Electrospun Rubber Nanofiber Web-Based Dry Electrodes for Biopotential Monitoring.

    Reza, Mohammad Shamim / Jin, Lu / Jeong, You Jeong / Oh, Tong In / Kim, Hongdoo / Kim, Kap Jin

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 17

    Abstract: This study aims to find base materials for dry electrode fabrication with high accuracy and without reducing electrode performance for long-term bioelectric potential monitoring after electroless silver plating. Most applications of dry electrodes that ... ...

    Abstract This study aims to find base materials for dry electrode fabrication with high accuracy and without reducing electrode performance for long-term bioelectric potential monitoring after electroless silver plating. Most applications of dry electrodes that have been developed in the past few decades are restricted by low accuracy compared to commercial Ag/AgCl gel electrodes, as in our previous study of PVDF-based dry electrodes. In a recent study, however, nanoweb-based chlorinated polyisoprene (CPI) and poly(styrene-
    Language English
    Publishing date 2023-08-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23177377
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Electrospun PVDF/aromatic HBP of 4th gen based flexible and self-powered TENG for wearable energy harvesting and health monitoring.

    Gunasekhar, Ramadasu / Reza, Mohammad Shamim / Kim, Kap Jin / Prabu, Arun Anand / Kim, Hongdoo

    Scientific reports

    2023  Volume 13, Issue 1, Page(s) 22645

    Abstract: In recent times, high-performance wearable electronic devices that can transform mechanical force into electrical energy for biomedical monitoring applications are receiving an increasing amount of attention. In the present study, we focused on a ... ...

    Abstract In recent times, high-performance wearable electronic devices that can transform mechanical force into electrical energy for biomedical monitoring applications are receiving an increasing amount of attention. In the present study, we focused on a flexible, self-powered and wearable triboelectric nanogenerator (TENG) based on electrospun polyvinylidene fluoride (PVDF)/aromatic hyperbranched polyester of 4th generation (Ar.HBP-G4, 0-40 wt.-% w.r.t. PVDF content) blend nanoweb as tribo-negative layer and melt-blown thermoplastic polyurethane (TPU) as tribo-positive layer for energy harvesting and human health monitoring applications. Among the varying Ar.HBP-G4 content used, incorporation of Ar.HBP-G4 (10 wt.-%) in PVDF (P-Ar.HBP-G4-10) showed higher increase in the triboelectric output voltage when compared to pristine PVDF and other Ar.HBP-G4 weight ratios. The optimized P-Ar.HBP-G4-10/TPU based TENG exhibited a peak-to-peak voltage (V
    Language English
    Publishing date 2023-12-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-023-50231-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Performance of TPC based ranging signal for more than 2 services multiplexing

    Kim Seung Tae / Kim Kap-Jin / Song Ki-Won / Ahn Jae Min

    E3S Web of Conferences, Vol 94, p

    2019  Volume 03007

    Abstract: This paper presents signal structure and power efficiency performance for simultaneous transmission of Global Navigation Satellite System (GNSS) service signals based on Tiered Polyphase Code (TPC). For the simultaneous transmission of three or more ... ...

    Abstract This paper presents signal structure and power efficiency performance for simultaneous transmission of Global Navigation Satellite System (GNSS) service signals based on Tiered Polyphase Code (TPC). For the simultaneous transmission of three or more service signals, the intermodulation terms addition and modification of the power allocations for the signal multiplexing are applied first to the spreading signal with the binary pseudorandom noise (PRN) code and a constant envelope signal is generated. Then, Zadoff-Chu sequence is applied as a secondary code to generate a multiplexed satellite navigation signal having a constant envelope characteristic. Simulation results show that power efficiency performance of more than 80% can be achieved in three service signal multiplexing.
    Keywords Environmental sciences ; GE1-350
    Language English
    Publishing date 2019-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: A New Method to Improve the Detection of Co-Seismic Ionospheric Disturbances using Sequential Measurement Combination.

    Kang, Seonho / Song, Junesol / Han, Deokhwa / Kim, Bugyeom / So, Hyoungmin / Kim, Kap-Jin / Kee, Changdon

    Sensors (Basel, Switzerland)

    2019  Volume 19, Issue 13

    Abstract: Earthquakes generate energy that propagates into the ionosphere and incurs co-seismic ionospheric disturbances (CIDs), which can be observed in ionospheric delay measurements. In most cases, the CID has a weak signal strength, because the energy in the ... ...

    Abstract Earthquakes generate energy that propagates into the ionosphere and incurs co-seismic ionospheric disturbances (CIDs), which can be observed in ionospheric delay measurements. In most cases, the CID has a weak signal strength, because the energy in the atmosphere transferred from the earthquake dissipates as it travels toward the ionosphere. It is particularly hard to observe at reference stations that are located far from the epicenter. As the number of Global Navigation Satellite System stations and their positions are restricted, it is important to employ weak CID data in the analysis by improving the detection performance of CIDs. In this study, we suggest a new method of detecting CIDs, which mainly uses a sequential measurement combination of the carrier phase-based ionospheric delay data, with a 1-second interval. The proposed method's performance was compared with conventional methods, including band-pass filters and a representative time-derivative method, using data from the 2011 Tohoku earthquake. As a result, the maximum CID-to-noise ratio can be increased by a maximum of 13% when the proposed method is used, and consequently, the detection performance of the CID can be improved.
    Language English
    Publishing date 2019-07-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s19132948
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Simple Synthesis of Palladium Nanoparticles, β-Phase Formation, and the Control of Chain and Dipole Orientations in Palladium-Doped Poly(vinylidene fluoride) Thin Films

    Mandal, Dipankar / Kim Kap Jin / Lee Jong Soon

    Langmuir. 2012 July 17, v. 28, no. 28

    2012  

    Abstract: Palladium nanoparticles (Pd-NP's) are prepared by a simple one-step procedure when poly(vinylidene fluoride) (PVDF) is used as a polymer stabilizer. High-quality Pd-NP-doped PVDF thin films are fabricated where the heat-controlled spin-coating technique ... ...

    Abstract Palladium nanoparticles (Pd-NP's) are prepared by a simple one-step procedure when poly(vinylidene fluoride) (PVDF) is used as a polymer stabilizer. High-quality Pd-NP-doped PVDF thin films are fabricated where the heat-controlled spin-coating technique is adopted. The effect of Pd-NP's on the crystal modifications and lamellae orientation in PVDF films is investigated using Fourier transform infrared-grazing incidence reflection absorption spectroscopy. The electroactive β phase and edge-on crystalline lamellae are found to be formed preferentially in Pd-NP-doped PVDF films. As a result, Pd-NP-doped PVDF ultrathin films gave a very good discernible contrast between the written and erased data bits, which suggests that they can be used as a scanning-probe-microscopy-based ferroelectric memory device or a ferroelectric gate field-effect transistor memory device in the future.
    Keywords fluorides ; nanoparticles ; palladium ; polymers ; spectroscopy ; stabilizers ; transistors
    Language English
    Dates of publication 2012-0717
    Size p. 10310-10317.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021%2Fla300983x
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Simple synthesis of palladium nanoparticles, β-phase formation, and the control of chain and dipole orientations in palladium-doped poly(vinylidene fluoride) thin films.

    Mandal, Dipankar / Kim, Kap Jin / Lee, Jong Soon

    Langmuir : the ACS journal of surfaces and colloids

    2012  Volume 28, Issue 28, Page(s) 10310–10317

    Abstract: Palladium nanoparticles (Pd-NP's) are prepared by a simple one-step procedure when poly(vinylidene fluoride) (PVDF) is used as a polymer stabilizer. High-quality Pd-NP-doped PVDF thin films are fabricated where the heat-controlled spin-coating technique ... ...

    Abstract Palladium nanoparticles (Pd-NP's) are prepared by a simple one-step procedure when poly(vinylidene fluoride) (PVDF) is used as a polymer stabilizer. High-quality Pd-NP-doped PVDF thin films are fabricated where the heat-controlled spin-coating technique is adopted. The effect of Pd-NP's on the crystal modifications and lamellae orientation in PVDF films is investigated using Fourier transform infrared-grazing incidence reflection absorption spectroscopy. The electroactive β phase and edge-on crystalline lamellae are found to be formed preferentially in Pd-NP-doped PVDF films. As a result, Pd-NP-doped PVDF ultrathin films gave a very good discernible contrast between the written and erased data bits, which suggests that they can be used as a scanning-probe-microscopy-based ferroelectric memory device or a ferroelectric gate field-effect transistor memory device in the future.
    MeSH term(s) Metal Nanoparticles/chemistry ; Organometallic Compounds/chemical synthesis ; Organometallic Compounds/chemistry ; Palladium/chemistry ; Particle Size ; Polyvinyls/chemistry ; Surface Properties
    Chemical Substances Organometallic Compounds ; Polyvinyls ; polyvinylidene fluoride (24937-79-9) ; Palladium (5TWQ1V240M)
    Language English
    Publishing date 2012-07-17
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/la300983x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Origin of piezoelectricity in an electrospun poly(vinylidene fluoride-trifluoroethylene) nanofiber web-based nanogenerator and nano-pressure sensor.

    Mandal, Dipankar / Yoon, Sun / Kim, Kap Jin

    Macromolecular rapid communications

    2011  Volume 32, Issue 11, Page(s) 831–837

    Abstract: A single stage electrospinning process can give rise to preferentially oriented induced dipoles in poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] nanofibers. The piezoelectricity of as-electrospun P(VDF-TrFE) nanofiber webs opens up new ... ...

    Abstract A single stage electrospinning process can give rise to preferentially oriented induced dipoles in poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] nanofibers. The piezoelectricity of as-electrospun P(VDF-TrFE) nanofiber webs opens up new possibilities for their use as a flexible nanogenerators and nano-pressure sensors. In this work, the origin of the piezoelectricity has been spotlighted by randomization of the induced dipoles at the Curie temperature and analyzed by polarized FT-IR spectroscopic techniques as well as by detecting the piezoelectric signal from a nano-pressure sensor.
    MeSH term(s) Hydrocarbons, Fluorinated/chemistry ; Nanofibers/chemistry ; Polymers/chemistry ; Pressure ; Rotation ; Spectroscopy, Fourier Transform Infrared ; Static Electricity ; Transition Temperature ; Vibration ; Vinyl Compounds/chemistry
    Chemical Substances Hydrocarbons, Fluorinated ; Polymers ; Vinyl Compounds ; poly(vinylidenefluoride-trifluoroethylene)
    Language English
    Publishing date 2011-06-01
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1475027-2
    ISSN 1521-3927 ; 1022-1336
    ISSN (online) 1521-3927
    ISSN 1022-1336
    DOI 10.1002/marc.201100040
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Transition from Nanorod to Nanotube of Poly(vinylidene trifluoroethylene) Ferroelectric Nanofiber

    Choi, Kiwoon / Kim Kap Jin / Lee Han Sup / Lee Se Cheol / Liang Yongri

    Macromolecules. 2013 Apr. 23, v. 46, no. 8

    2013  

    Abstract: The nanorod-to-nanotube transition of a piezoelectric poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF-TrFE)) nanofiber inside cylindrical nanopores (CNP) with various pore diameters was precisely determined. After infiltrating the polymer into the ... ...

    Abstract The nanorod-to-nanotube transition of a piezoelectric poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF-TrFE)) nanofiber inside cylindrical nanopores (CNP) with various pore diameters was precisely determined. After infiltrating the polymer into the CNP, a solid nanorod or hollow nanotube was obtained depending on the relative magnitude of the CNP diameter used compared to the critical pore diameter. The thickness of the lamellae formed inside the solid nanorod was found to be linearly dependent on the diameter of the nanocylinder. In addition, the wall thickness of the polymer nanotube increased with increasing nanocylinder diameter. The dependence of ferroelectric properties of the P(VDF–TrFE) nanofiber on the morphological transition were evaluated by measuring the piezoelectric polarization hysteresis loops. Compared to the hollow nanotube, the solid P(VDF–TrFE) nanorod showed significantly enhanced maximum polarization behavior, which is desirable for ferroelectric applications. These results show that the morphological transition from solid nanorod to hollow nanotube can play an important key role in the ferroelectric device fabrication of P(VDF–TrFE).
    Keywords hysteresis ; nanofibers ; nanopores ; nanorods ; nanotubes ; polymers
    Language English
    Dates of publication 2013-0423
    Size p. 3067-3073.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 1491942-4
    ISSN 1520-5835 ; 0024-9297
    ISSN (online) 1520-5835
    ISSN 0024-9297
    DOI 10.1021%2Fma302679g
    Database NAL-Catalogue (AGRICOLA)

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