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Kim B, Song J, Kim JY, Hwang J, Park D. The control of particle size distribution for fabricated alumina nanoparticles using a thermophoretic separator. ADV POWDER TECHNOL 2019. [DOI: 10.1016/j.apt.2019.06.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kim B, Song J, Kim JY, Hwang J, Park D. Study on nanoparticle production process characteristics in transferred arc plasma system using heat and mass balance. ADV POWDER TECHNOL 2018. [DOI: 10.1016/j.apt.2018.08.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Park CS, Kim DH, Shin BJ, Tae HS. Synthesis and Characterization of Nanofibrous Polyaniline Thin Film Prepared by Novel Atmospheric Pressure Plasma Polymerization Technique. MATERIALS 2016; 9:ma9010039. [PMID: 28787838 PMCID: PMC5456571 DOI: 10.3390/ma9010039] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 01/05/2016] [Accepted: 01/07/2016] [Indexed: 11/26/2022]
Abstract
This work presents a study on the preparation of plasma-polymerized aniline (pPANI) nanofibers and nanoparticles by an intense plasma cloud type atmospheric pressure plasma jets (iPC-APPJ) device with a single bundle of three glass tubes. The nano size polymer was obtained at a sinusoidal wave with a peak value of 8 kV and a frequency of 26 kHz under ambient air. Discharge currents, photo-sensor amplifier, and optical emission spectrometer (OES) techniques were used to analyze the plasma produced from the iPC-APPJ device. Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), gas chromatography-mass spectrometry (GC-MS), and gel permeation chromatography (GPC) techniques were used to analyze the pPANI. FE-SEM and TEM results show that pPANI has nanofibers, nanoparticles morphology, and polycrystalline characteristics. The FT-IR and GC-MS analysis show the characteristic polyaniline peaks with evidence that some quinone and benzene rings are broken by the discharge energy. GPC results show that pPANI has high molecular weight (Mw), about 533 kDa with 1.9 polydispersity index (PDI). This study contributes to a better understanding on the novel growth process and synthesis of uniform polyaniline nanofibers and nanoparticles with high molecular weights using the simple atmospheric pressure plasma polymerization technique.
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Affiliation(s)
- Choon-Sang Park
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 702-701, Korea.
| | - Dong Ha Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 702-701, Korea.
| | - Bhum Jae Shin
- Department of Electronics Engineering, Sejong University, Seoul 143-747, Korea.
| | - Heung-Sik Tae
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 702-701, Korea.
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Microwave Plasma Synthesis of Materials—From Physics and Chemistry to Nanoparticles: A Materials Scientist’s Viewpoint. INORGANICS 2014. [DOI: 10.3390/inorganics2030468] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Mupparapu R, Vynck K, Malfanti I, Vignolini S, Burresi M, Scudo P, Fusco R, Wiersma DS. Enhanced downconversion of UV light by resonant scattering of aluminum nanoparticles. OPTICS LETTERS 2012; 37:368-370. [PMID: 22297355 DOI: 10.1364/ol.37.000368] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Metallic nanoparticles are known to enhance nonlinear optical processes due to a local enhancement of the optical field. This strategy has been proposed to enhance downconversion in thin film solar cells, but has various disadvantages, among which is the fact that the enhancement occurs only in a tiny volume close to the particles. We report on a very different physical mechanism that can lead to significant downconversion enhancement, namely, that of resonant light scattering, and which is a large volume effect. We show that only a tiny amount of resonantly scattering metallic (aluminum) nanoparticles is enough to create a significant enhancement of the fluorescence of dye molecules in the visible wavelength range. The strategy can be applied in general to increase the emission of UV-absorbing constituents, and is of particular use for solar energy.
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Affiliation(s)
- Rajeshkumar Mupparapu
- European Laboratory for Non-linear Spectroscopy (LENS), University of Florence, Sesto Fiorentino, Italy
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Jung DS, Park SB, Kang YC. Design of particles by spray pyrolysis and recent progress in its application. KOREAN J CHEM ENG 2010. [DOI: 10.1007/s11814-010-0402-5] [Citation(s) in RCA: 110] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bunker CE, Smith MJ, Fernando KAS, Harruff BA, Lewis WK, Gord JR, Guliants EA, Phelps DK. Spontaneous hydrogen generation from organic-capped Al nanoparticles and water. ACS APPLIED MATERIALS & INTERFACES 2010; 2:11-14. [PMID: 20356213 DOI: 10.1021/am900757r] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The development of technologies that would lead toward the adoption of a hydrogen economy requires readily available, safe, and environmentally friendly access to hydrogen. This can be achieved using the aluminum-water reaction; however, the protective nature and stability of aluminum oxide is a clear detriment to its application. Here, we demonstrate the spontaneous generation of hydrogen gas from ordinary room-temperature tap water when combined with aluminum-oleic acid core-shell nanoparticles obtained via sonochemistry. The reaction is found to be near-complete (>95% yield hydrogen) with a tunable rate from 6.4x10(-4) to 0.01 g of H2/s/g of Al and to yield an environmentally benign byproduct. The potential of these nanoparticles as a source of hydrogen gas for power generation is demonstrated using a simple fuel cell with an applied load.
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Li KJ, Huang SP, Tu WX, Zhu JQ, Liu H. Melting Behaviour of Shell-symmetric Aluminum Nanoparticles: Molecular Dynamics Simulation. CHINESE J CHEM PHYS 2009. [DOI: 10.1088/1674-0068/22/03/215-222] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Lee YC, Jeng FT, Chen CC. Technique for aerosol generation with controllable micrometer size distribution. CHEMOSPHERE 2008; 73:760-767. [PMID: 18682310 DOI: 10.1016/j.chemosphere.2008.06.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2008] [Revised: 06/09/2008] [Accepted: 06/10/2008] [Indexed: 05/26/2023]
Abstract
The purpose of this study is to develop an aerosol generating system that can produce particles of micrometer size in a convenient and efficient way. This system is comprised of an ultrasonic atomizer, potassium sodium tartrate tetrahydrate (PST) as solute and a program-controlled solute feeding unit with different PST concentrations. Both the aerosol concentration and size distribution pattern can be easily controlled and reproduced in the developed system. While the initial size of droplets generated from atomizer may remain unchanged, the size of residual dry aerosols was controlled by the solute concentration adjusted by the mixing ratio of solute and water. In addition, PST concentration could be alternatively adjusted in any cyclic way to provide particles with relatively mono-disperse, bimodal, varying size as well as skew distribution to meet requirements for various applications. The main advantage of the generating system is to generate particles of specific size distribution in order to simulate aerosols in ambient air or working places.
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Affiliation(s)
- Yao-Chuan Lee
- Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 10617, Taiwan.
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Dato A, Radmilovic V, Lee Z, Phillips J, Frenklach M. Substrate-free gas-phase synthesis of graphene sheets. NANO LETTERS 2008; 8:2012-6. [PMID: 18529034 DOI: 10.1021/nl8011566] [Citation(s) in RCA: 204] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
We present a novel method for synthesizing graphene sheets in the gas phase using a substrate-free, atmospheric-pressure microwave plasma reactor. Graphene sheets were synthesized by passing liquid ethanol droplets into an argon plasma. The graphene sheets were characterized by transmission electron microscopy, electron energy loss spectroscopy, Raman spectroscopy, and electron diffraction. We prove that graphene can be created without three-dimensional materials or substrates and demonstrate a possible avenue to the large-scale synthesis of graphene.
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Affiliation(s)
- Albert Dato
- Applied Science and Technology Graduate Group, University of California, Berkeley, California 94720, USA.
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Luhrs C, Phillips J, Fanson PT. Production of complex cerium-aluminum oxides using an atmospheric pressure plasma torch. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:7055-64. [PMID: 17500574 DOI: 10.1021/la063108m] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Ceria-alumina particles of a wide variety of structures, from micrometer-sized hollow spheres to nanoparticles, were produced from aerosols of different natures, but all derived from nitrate salts passed through a low power (<1000 W) atmospheric pressure plasma torch. The amount of water present with the nitrate salts was found to significantly affect the morphology of the resulting material. A model was proposed that explains the mechanism in which water acts as a blowing agent to create hollow metal oxide spheres that then shatter to form metal oxide nanoparticles. Further examination of the nanoparticles revealed that they display a core/shell morphology in which the core material is crystalline CeO2 and the shell material is amorphous Al2O3. These unique core/shell materials are interesting candidates for catalyst support materials with high thermal durability. In addition, experiments have shown that the nanoparticles can be readily converted into CeAlO3 perovskite.
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Affiliation(s)
- Claudia Luhrs
- Department of Mechanical Engineering, University of New Mexico, Albuquerque, NM 87131, USA
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Song Y, Doomes EE, Prindle J, Tittsworth R, Hormes J, Kumar CSSR. Investigations into Sulfobetaine-Stabilized Cu Nanoparticle Formation: Toward Development of a Microfluidic Synthesis. J Phys Chem B 2005; 109:9330-8. [PMID: 16852117 DOI: 10.1021/jp044777g] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The mechanistic aspects of the formation of sulfobetaine-stabilized copper nanoparticles were investigated by using in situ XANES (X-ray absorption near edge structure), UV-vis spectroscopy, and reaction calorimetry. The tetracoordinated sulfobetaine-Cu(II) complex was reduced to a stable sulfobetaine-Cu(I) complex prior to the formation of sulfobetaine-stabilized copper nanoparticles. The stability of the Cu(I) complex was found to be sensitive to the concentration of the sulfobetaine stabilizer and the addition rate of the reducing agent. It appears to exist primarily as a linear complex. A tetracoordinated Cu(I) complex as an intermediate has also been postulated. Based on the understanding from these investigations, a microfluidic process for copper nanoparticle synthesis was designed by using sulfobetaine-Cu(I) complex as the starting material. When compared with the copper nanoparticles synthesized by a conventional batch process, the microfluidic reactor process provided particles with a smaller size and narrower size distribution. The copper nanoparticles from the microreactor process could also be more easily purified and the particles were relatively stable in air. Both XRD and SAED indicated that the Cu nanoparticles synthesized have fcc structure.
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Affiliation(s)
- Yujun Song
- Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, Louisiana 70806, USA
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