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Otgonbayar Z, Kim J, Jekal S, Kim CG, Noh J, Oh WC, Yoon CM. Designing a highly near infrared-reflective black nanoparticles for autonomous driving based on the refractive index and principle. J Colloid Interface Sci 2024; 667:663-678. [PMID: 38670010 DOI: 10.1016/j.jcis.2024.04.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 03/30/2024] [Accepted: 04/19/2024] [Indexed: 04/28/2024]
Abstract
HYPOTHESIS The development of highly NIR reflective black single-shell hollow nanoparticles (BSS-HNPs) can overcome the Light Detection and Ranging (LiDAR) sensor limitations of dark-tone materials. The crystalline phase of TiO2 and the refractive index can be controlled by calcination temperature. The formation of hollow structure and the refractive index is expected to simultaneously increase the light reflection and LiDAR detectability. EXPERIMENTS The BSS-HNPs are synthesized using the sol-gel method, calcination, NaBH4 reduction, and etching to form a hollow structure with true blackness. The computational bandgap calculation is conducted to determine the bandgap energy (Eg) of the white and black TiO2 with different crystalline structures. The blackness of the as-synthesized materials is determined by the Commission on Illumination (CIE) L*a*b* color system. FINDINGS The hydrophilic nature of BSS-HNPs enables the formulation of hydrophilic paints, allowing the mono-layer coating. With the synergistic effects of hollow structure and the refractive index, BSS-HNPs manifested superb NIR reflectance at LiDAR detection wavelengths. The high detectability, blackness, and hollow structure of BSS-HNPs can expand the variety of LiDAR-detectable dark-tone materials.
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Affiliation(s)
- Zambaga Otgonbayar
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea
| | - Jiwon Kim
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea
| | - Suk Jekal
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea
| | - Chan-Gyo Kim
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea
| | - Jungchul Noh
- McKetta Department of Chemical Engineering and Texas Material Institute, The University of Texas at Austin, Austin, TX 78712, USA
| | - Won-Chun Oh
- Department of Advanced Materials Science & Engineering, Hanseo University, 46 Hanseo 1-ro, Seosan-si, Chungnam 356-706, Korea
| | - Chang-Min Yoon
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea.
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Myasoedova TN, Nedoedkova OV, Kalusulingam R, Popov YV, Mikheykin AS, Konstantinov AS, Zhengyou L, Mikhailova TS, Shmatko VA, Yalovega GE. Fabrication of Ni-Polyaniline/Graphene Oxide Composite Electrode with High Capacitance and Water Splitting Activity. Chemphyschem 2024; 25:e202300795. [PMID: 38695276 DOI: 10.1002/cphc.202300795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 04/18/2024] [Indexed: 07/03/2024]
Abstract
The Ni-PANI@GO composite electrode was fabricated via cost effective electrodeposition technique. According to the XRD, FTIR, Raman, SEM, and XPS analyses revealed that the nickel doped PANI@GO composite has been fabricated on the surface of the nickel foam. Addition of nickel significantly enhanced interaction between graphene with PANI leading to higher degree of polyaniline doping though imine groups. Electrochemical investigation revelated the significant performance of the Ni-PANI@GO composite electrode, boosting an impressive capacitance of 4480 F/g at 40 A/g, surpassing previous Ni-foam-based binder-free electrodes. Notably, Ni-PANI@GO electrode displayed excellent catalytic activity in both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), generating a considerable volume of the gas bubbles at relatively modest overpotentials of 279 mV and 244 mV respectively. This event allows for the achievement of 20 mA cm-2 current density. Furthermore, in the laboratory-scale water electrolyzer, a low cell voltage of 1.72 V was achieved, facilitating a water-splitting current density of 20 mA cm-2. This study underscores the premising potential for the real-world device's application of the versatile Ni-PANI@GO composite electrode.
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Affiliation(s)
- Tatiana N Myasoedova
- Institute of Nanotechnologies, Electronics and Electronic Equipment Engineering, Southern Federal University, Taganrog, 347900, Russia
| | - Olga V Nedoedkova
- Faculty of Physics, Southern Federal University, Rostov-on-Don, 344090, Russia
| | - Rajathsing Kalusulingam
- Institute of Nanotechnologies, Electronics and Electronic Equipment Engineering, Southern Federal University, Taganrog, 347900, Russia
| | - Yury V Popov
- Institute of Earth Sciences, Southern Federal University, Rostov-on-Don, 344090, Russia
| | - Alexey S Mikheykin
- Faculty of Physics, Southern Federal University, Rostov-on-Don, 344090, Russia
| | | | - Li Zhengyou
- Faculty of Physics, Southern Federal University, Rostov-on-Don, 344090, Russia
| | - Tatiana S Mikhailova
- Institute of Nanotechnologies, Electronics and Electronic Equipment Engineering, Southern Federal University, Taganrog, 347900, Russia
| | - Valentina A Shmatko
- Faculty of Physics, Southern Federal University, Rostov-on-Don, 344090, Russia
| | - Galina E Yalovega
- Faculty of Physics, Southern Federal University, Rostov-on-Don, 344090, Russia
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Noh J, Jekal S, Kim J, Kim HY, Chu YR, Kim CG, Oh WC, Song S, Sub Sim H, Yoon CM. Vivid-Colored Electrorheological fluids with simultaneous enhancements in color clarity and Electro-Responsivity. J Colloid Interface Sci 2024; 657:373-383. [PMID: 38043239 DOI: 10.1016/j.jcis.2023.11.183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 11/16/2023] [Accepted: 11/28/2023] [Indexed: 12/05/2023]
Abstract
HYPOTHESIS Surface modification of dielectric materials changes the dipole-dipole interactions under electric fields, thereby controlling the electrorheological (ER) response. The introduction of metal oxides onto mica templates and further coating of dyes is expected to simultaneously improve the color clarity and ER performance. EXPERIMENTS Dye-coated TiO2 platelets on mica are synthesized for high-performance colorful ER fluids. A sol-gel method is utilized to grow TiO2 on mica to prepare precursor light-colored mica/TiO2 materials, which are coated with appropriate dyes to enhance the vividness as determined by the Commission Internationale de clairage L*a*b* color system. The color expression and color clarity improvement are explained via the light interference effect and the presence of chromophores. FINDINGS The uniform TiO2 layers can be obtained under low pH conditions with controlled nucleation kinetics. The addition of dyes to TiO2 increases the surface area and porosity of ER materials and introduces heteroatoms that act as positive factors. In practical ER applications, dye-coated TiO2-based ER fluids exhibit higher ER performances compared with the corresponding light-colored TiO2-based ER fluids. The vivid-colored ER fluids could provide an easy selection for a wide range of rheological systems requiring a specific magnitude of stress by confirming the color.
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Affiliation(s)
- Jungchul Noh
- McKetta Department of Chemical Engineering and Texas Material Institute, The University of Texas at Austin, Austin, TX 78712, USA.
| | - Suk Jekal
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejon 34158, Korea.
| | - Jiwon Kim
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejon 34158, Korea.
| | - Ha-Yeong Kim
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejon 34158, Korea.
| | - Yeon-Ryong Chu
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejon 34158, Korea.
| | - Chan-Gyo Kim
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejon 34158, Korea.
| | - Won-Chun Oh
- Department of Advanced Materials Science & Engineering, Hanseo University, 46 Hanseo 1-ro, Seosan-si, Chungnam 356-706, Korea.
| | - Seulki Song
- Department of Chemical Engineering and Applied Chemistry, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea.
| | - Hyung Sub Sim
- Department of Aerospace Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea.
| | - Chang-Min Yoon
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejon 34158, Korea.
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