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Estili M, Matsuda S, Jia L, Sakai N, Ma R, Suzuki TS, Uosaki K. CNT-MXene ultralight membranes: fabrication, surface nano/microstructure, 2D-3D stacking architecture, ion-transport mechanism, and potential application as interlayers for Li-O 2 batteries. Nanoscale 2023; 15:8289-8303. [PMID: 37078832 DOI: 10.1039/d3nr00712j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Multiwalled carbon nanotubes (MWCNTs) have shown effectiveness in improving the suitability of MXenes for energy-related applications. However, the ability of individually dispersed MWCNTs to control the structure of MXene-based macrostructures is unclear. Here, the correlation among composition, surface nano- and microstructure, MXenes' stacking order, structural swelling, and Li-ion transport mechanisms and properties in individually dispersed MWCNT-Ti3C2 films was investigated. The compact surface microstructure of MXene film, characterized by prominent wrinkles, is dramatically changed as MWCNTs occupy MXene/MXene edge interfaces. The 2D stacking order is preserved up to 30 wt% MWCNTs despite a significant swelling of ∼400%. Such alignment is completely disrupted at 40 wt%, and a more pronounced surface opening and internal expansion of ∼770% are realized. Both 30 wt% and 40 wt% membranes show stable cycling performance under a significantly higher current density due to faster transport channels. Notably, for the 3D membrane, the overpotential during repeated Li deposition/dissolution reactions is further reduced by ∼50%. Ion-transport mechanisms in the absence and presence of MWCNTs are discussed. Furthermore, ultralight yet continuous hybrid films comprising up to ∼0.027 mg cm-2 Ti3C2 can be prepared using aqueous colloidal dispersions and vacuum filtration for specific applications. The potential application of such ultralight membranes as interlayers for Li-O2 batteries is briefly examined.
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Affiliation(s)
- Mehdi Estili
- Ceramics Processing Group, Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Japan.
| | - Shoichi Matsuda
- Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Japan.
- NIMS-SoftBank Advanced Technologies Development Center, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Japan
| | - Lulu Jia
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Japan
| | - Nobuyuki Sakai
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Japan
| | - Renzhi Ma
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Japan
| | - Tohru S Suzuki
- Ceramics Processing Group, Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Japan.
| | - Kohei Uosaki
- Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Japan.
- NIMS-SoftBank Advanced Technologies Development Center, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Japan
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2
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Koyasu S, Makino H, Tarutani N, Suzuki TS, Uchikoshi T, Ishigaki T. Preparation of Oriented ZnO Rod Arrays Using Hexagonal Plate-Like Particles as a Seed Layer. Langmuir 2023; 39:487-494. [PMID: 36574623 DOI: 10.1021/acs.langmuir.2c02734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
ZnO rod film is a promising material for electrodes and sensors due to its large surface area and high electrical conductivity. One of the drawbacks of conventional ZnO rod film is the random orientation of rods. In this study, an oriented ZnO seed layer composed of hexagonal plate-like ZnO particles was prepared by dip-coating. An oriented ZnO rod film was then synthesized by growing this seed layer using a hydrothermal synthesis method. We optimized the concentration of the precursor and the hydrothermal treatment time to synthesize homogeneous ZnO rod arrays. The uniformity of the rod arrays was improved by applying a strong magnetic field (12 T) during hydrothermal treatment.
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Affiliation(s)
- Satoshi Koyasu
- Department of Chemical Science and Technology, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo184-8584, Japan
| | - Hiroki Makino
- Department of Chemical Science and Technology, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo184-8584, Japan
| | - Naoki Tarutani
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima739-8527, Japan
- Research Center for Micro-Nano Technology, Hosei University, 3-11-15 Midori-cho, Koganei,Tokyo184-0003, Japan
| | - Tohru S Suzuki
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki305-0047, Japan
| | - Tetsuo Uchikoshi
- Research Center for Micro-Nano Technology, Hosei University, 3-11-15 Midori-cho, Koganei,Tokyo184-0003, Japan
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki305-0047, Japan
| | - Takamasa Ishigaki
- Department of Chemical Science and Technology, Hosei University, 3-7-2 Kajino-cho, Koganei, Tokyo184-8584, Japan
- Research Center for Micro-Nano Technology, Hosei University, 3-11-15 Midori-cho, Koganei,Tokyo184-0003, Japan
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Furuse H, Kato D, Morita K, Suzuki TS, Kim BN. Characterization of Transparent Fluorapatite Ceramics Fabricated by Spark Plasma Sintering. Materials (Basel) 2022; 15:8157. [PMID: 36431642 PMCID: PMC9698385 DOI: 10.3390/ma15228157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 10/28/2022] [Accepted: 11/11/2022] [Indexed: 06/16/2023]
Abstract
Highly optically transparent polycrystalline fluorapatite ceramics with hexagonal crystal structures were fabricated via a liquid-phase synthesis of fluorapatite powder, followed by spark plasma sintering (SPS). The effect of sintering temperature, as observed using a thermopile, on the optical transmittance and microstructure of the ceramics was investigated in order to determine suitable sintering conditions. As a result, high optical transmittance was obtained in the SPS temperature range of 950-1100 °C. The highest optical transmittance was obtained for the ceramic sample sintered at 1000 °C, and its average grain size was evaluated at only 134 nm. The grain size dramatically increased with temperature, and the ceramics became translucent at SPS temperatures above 1200 °C. The mechanical and thermal properties of the ceramics were measured to evaluate the thermal shock parameter, which was found to be comparable to or slightly smaller than that of single-crystal fluorapatite. This transparent polycrystalline fluorapatite ceramic material should prove useful in a wide range of applications, for example as a biomaterial or optical/laser material, in the future. Furthermore, the knowledge obtained in this study should help to promote the application of this ceramic material.
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Affiliation(s)
- Hiroaki Furuse
- Kitami Institute of Technology, 165 Koen-cho, Kitami 090-8507, Hokkaido, Japan
| | - Daichi Kato
- Kitami Institute of Technology, 165 Koen-cho, Kitami 090-8507, Hokkaido, Japan
| | - Koji Morita
- National Institute for Materials Science, 1-2-1, Sengen, Tsukuba 305-0047, Ibaraki, Japan
| | - Tohru S. Suzuki
- National Institute for Materials Science, 1-2-1, Sengen, Tsukuba 305-0047, Ibaraki, Japan
| | - Byung-Nam Kim
- National Institute for Materials Science, 1-2-1, Sengen, Tsukuba 305-0047, Ibaraki, Japan
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4
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Liu R, Tane M, Kimizuka H, Shirakami Y, Ikeda KI, Miura S, Morita K, Suzuki TS, Sakka Y, Zhang L, Sekino T. Elastic isotropy originating from heterogeneous interlayer elastic deformation in a Ti3SiC2 MAX phase with a nanolayered crystal structure. Ann Ital Chir 2021. [DOI: 10.1016/j.jeurceramsoc.2020.11.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Liu L, Morita K, Suzuki TS, Kim BN. Effect of volume ratio on optical and mechanical properties of Y2O3-MgO composites fabricated by spark-plasma-sintering process. Ann Ital Chir 2021. [DOI: 10.1016/j.jeurceramsoc.2020.10.074] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ito M, Kanazawa HK, Kaneko SK, Kanemaru YK, Kiyama TK, Arima YA, Takashio ST, Yamamoto EY, Kaikita KK, Fujisue KF, Sueta DS, Usuku HU, Suzuki TS, Sakamoto KS, Tsujita KT. P1864Primary predictor of esophageal injury after catheter ablation of atrial fibrillation. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
It has been demonstrated that the short distance between the esophagus and the posterior left atrium (LA) is closely associated with the occurrence of esophageal injury (EI) after catheter ablation of atrial fibrillation (AF). Meanwhile, it has not been fully elucidated whether esophageal temperature monitoring sufficiently prevent EI.
Objectives
The purpose of this study was to examine the usefulness of esophageal temperature monitoring for avoiding EI. Further we analyzed the relation between the incidence of EI and the distance between the esophagus and the posterior LA measured on the contrast computed tomography (CT).
Methods
Among 403 patients who underwent catheter ablation of AF, upper gastrointestinal tract endoscopy was performed the next day after ablation to examine for EI. The incidence of EI was compared between 95 patients who used esophageal temperature probe (ETP) (ETP Group) and 308 patients who did not used ETP (Non-ETP Group) during ablation. The shortest distance between esophagus and posterior LA measured on contrast CT (SD-CT) was also compared between the ETP and Non-ETP Groups.
Results
In all patients, EI was found in 35 patients (8.6%). The SD-CT in patients with EI was significantly lower than that in patients without EI (2.3±0.6 vs 4.1±0.8 mm, p<0.001).
No differences were observed between the two groups in terms of age, body mass index, LA diameter, esophageal course, total number of radiofrequency (RF) energy applications, total amount of RF energy applications, or the location of SD-CT. Also, EI occurred at nealy the same frequency between the ETP Group and Non-ETP Group (8/95 patients; 8.4% vs 27/308 patients; 8.8%, p=0.553). The severity diagnosed as moderate (erosion) in 3 patients and mild (erythema) in 5 patients of ETP Group, and as severe (ulcer) in 23 patients and mild (erythema) in 4 patients of Non-ETP Group. There was no significant difference in the SD-CT between the ETP Group and Non-ETP Group (3.96±0.98 vs 4.19±1.01 mm, p=0.54). However, the SD-CT in patients with EI was significantly shorter than the SD-CT in patients without EI, both in the ETP Group (2.3±0.6 vs 4.1±0.9 mm, p<0.001) and in the Non-ETP Group (2.5±0.2 vs 4.2±0.9 mm, p=0.017), respectively. Multiple regression analysis revealed that only SD-CT significantly correlated with EI. The area under a receiver operating characteristic curve using ST-CT as a predictive marker in EI patients was 0.971 (p<0.001). When the cut-off value of EI was set at 2.9mm, the sensitivity and specificity for EI diagnosis were 96.6% and 87.5%.
Conclusions
The incidence of EI was significantly correlated with SD-CT. Esophageal temperature monitoring did not reduce EI, however, the use of monitoring alleviated the severity of EI, especially in patients with short SD-CT.
Acknowledgement/Funding
None
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Affiliation(s)
- M Ito
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - H K Kanazawa
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - S K Kaneko
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - Y K Kanemaru
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - T K Kiyama
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - Y A Arima
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - S T Takashio
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - E Y Yamamoto
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - K K Kaikita
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - K F Fujisue
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - D S Sueta
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - H U Usuku
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - T S Suzuki
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - K S Sakamoto
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
| | - K T Tsujita
- Kumamoto University Hospital, Department of Cardiovascular Medicine, Kumamoto University Graduate School of Medical Science, Kumamoto, Japan
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Takasaki M, Suzuki TS, Oaki Y, Imai H. Biomimetic macroscopic mesocrystalline films produced by oriented assembly of nanorods under magnetic field. Nanoscale 2018; 10:22161-22165. [PMID: 30474681 DOI: 10.1039/c8nr07853j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Millimeter-scale mesocrystals and cross-lamellae mimicking the nanostructure of seashells were produced on a substrate through the three-dimensionally oriented assembly of c-axis-elongated calcite nanorods ∼50 nm wide and ∼500-1000 nm long by combining arrangement with evaporation-driven capillary force and alignment under an intense magnetic field.
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Affiliation(s)
- Mihiro Takasaki
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
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8
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Nakano H, Furuya S, Yuasa M, Suzuki TS, Ohsato H. Fabrication and anisotropic electronic property for oriented Li1+−Nb1−−3Ti+4O3 solid solution by slip casting in a high magnetic field. ADV POWDER TECHNOL 2017. [DOI: 10.1016/j.apt.2017.06.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Kobayashi E, Ueno S, Nakashima K, Kumada N, Suzuki TS, Uchikoshi T, Sakka Y, Fujii I, Wada S. Fabrication of (111)-oriented Tetragonal BaTiO 3 Ceramics by an Electrophoretic Deposition in a High Magnetic Field. ACTA ACUST UNITED AC 2015. [DOI: 10.14723/tmrsj.40.223] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Wu WW, Sakka Y, Estili M, Suzuki TS, Nishimura T, Zhang GJ. Microstructure and high-temperature strength of textured and non-textured ZrB 2 ceramics. Sci Technol Adv Mater 2014; 15:014202. [PMID: 27877629 PMCID: PMC5090590 DOI: 10.1088/1468-6996/15/1/014202] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 12/03/2013] [Accepted: 11/04/2013] [Indexed: 05/23/2023]
Abstract
Zirconium diboride (ZrB2) ceramic possesses a unique combination of nice mechanical performance, high melting point (> 3000 °C) and great high-temperature oxidation resistance (up to 1600 °C), which makes it a promising material system for ever-increasing ultra-high temperature (UHT) applications. However, ZrB2 suffers from poor mechanical performance at UHTs, which could strongly limit its applications at UHT. Here, we successfully demonstrate that texturing is an effective strategy to greatly enhance the flexural strength of monolithic ZrB2, reaching a high value of 810 ± 60 MPa at 1600 °C when loaded in c-axis direction. We thoroughly discuss the strengthening mechanism by in-depth microstructural observations and analysis. Our discovery has technological and scientific implications for other UHT ceramic systems, especially those using ZrB2 as a matrix.
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Affiliation(s)
- Wen-Wen Wu
- Advanced Ceramics Group, National Institute for Materials Science (NIMS), 1-2-1 Tsukuba, Ibaraki, 305-0047, Japan
| | - Yoshio Sakka
- Advanced Ceramics Group, National Institute for Materials Science (NIMS), 1-2-1 Tsukuba, Ibaraki, 305-0047, Japan
| | - Mehdi Estili
- International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, 305-0047, Japan
| | - Tohru S Suzuki
- Advanced Ceramics Group, National Institute for Materials Science (NIMS), 1-2-1 Tsukuba, Ibaraki, 305-0047, Japan
| | - Toshiyuki Nishimura
- Sialon Group, Sialon Unit, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, 305-0044, Japan
| | - Guo-Jun Zhang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Shanghai, 200050, People's Republic of China
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Uda M, Okuyama H, Suzuki TS, Sakka Y. Hydrogen generation from water using Mg nanopowder produced by arc plasma method. Sci Technol Adv Mater 2012; 13:025009. [PMID: 27877487 PMCID: PMC5090637 DOI: 10.1088/1468-6996/13/2/025009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Revised: 04/20/2012] [Accepted: 03/05/2012] [Indexed: 06/06/2023]
Abstract
We report that hydrogen gas can be easily produced from water at room temperature using a Mg nanopowder (30-1000 nm particles, average diameter 265 nm). The Mg nanopowder was produced by dc arc melting of a Mg ingot in a chamber with mixed-gas atmosphere (20% N2-80% Ar) at 0.1 MPa using custom-built nanopowder production equipment. The Mg nanopowder was passivated with a gas mixture of 1% O2 in Ar for 12 h in the final step of the synthesis, after which the nanopowder could be safely handled in ambient air. The nanopowder vigorously reacted with water at room temperature, producing 110 ml of hydrogen gas per 1 g of powder in 600 s. This amount corresponds to 11% of the hydrogen that could be generated by the stoichiometric reaction between Mg and water. Mg(OH)2 flakes formed on the surface of the Mg particles as a result of this reaction. They easily peeled off, and the generation of hydrogen continued until all the Mg was consumed.
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Keskinbora K, Suzuki TS, Ozgur Ozer I, Sakka Y, Suvaci E. Hybrid processing and anisotropic sintering shrinkage in textured ZnO ceramics. Sci Technol Adv Mater 2010; 11:065006. [PMID: 27877373 PMCID: PMC5090455 DOI: 10.1088/1468-6996/11/6/065006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Revised: 01/11/2011] [Accepted: 11/25/2010] [Indexed: 06/06/2023]
Abstract
We have studied the combined effects of the templated grain growth and magnetic alignment processes on sintering, anisotropic sintering shrinkage, microstructure development and texture in ZnO ceramics. Suspensions of 0-10 vol % ZnO template particles were slip cast in a 12 T rotating magnetic field. Sintering and texture characteristics were investigated via thermomechanical analysis and electron backscatter diffraction, respectively. Sintering as well as texture characteristics depend on template concentration. For the studied ZnO system, there is a critical template concentration (2 vol % in this study) above which densification is limited by the templates owing to constrained sintering. Below this limit, the densification is enhanced and the anisotropic shrinkage is reduced, which is attributed to densifying characteristics of the templates.
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Affiliation(s)
- Kahraman Keskinbora
- Department of Materials Science and Engineering, Anadolu University, Iki Eylul Campus, 26480 Eskisehir, Turkey
| | - Tohru S Suzuki
- Fine Particle Processing Group, National Institute for Materals Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - I Ozgur Ozer
- Department of Materials Science and Engineering, Anadolu University, Iki Eylul Campus, 26480 Eskisehir, Turkey
| | - Yoshio Sakka
- Fine Particle Processing Group, National Institute for Materals Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Ender Suvaci
- Department of Materials Science and Engineering, Anadolu University, Iki Eylul Campus, 26480 Eskisehir, Turkey
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15
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Suárez G, Sakka Y, Suzuki TS, Uchikoshi T, Zhu X, Aglietti EF. Effect of starting powders on the sintering of nanostructured ZrO 2 ceramics by colloidal processing. Sci Technol Adv Mater 2009; 10:025004. [PMID: 27877291 PMCID: PMC5090448 DOI: 10.1088/1468-6996/10/2/025004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2009] [Revised: 07/10/2009] [Accepted: 05/26/2009] [Indexed: 06/06/2023]
Abstract
The effect of starting powders on the sintering of nanostructured tetragonal zirconia was evaluated. Suspensions were prepared with a concentration of 10 vol.% by mixing a bicomponent mixture of commercial powders (97 mol.% monoclinic zirconia with 3 mol.% yttria) and by dispersing commercially available tetragonal zirconia (3YTZ, Tosoh). The preparation of the slurry by bead-milling was optimized. Colloidal processing using 50 μm zirconia beads at 4000 rpm generated a fully deagglomerated suspension leading to the formation of high-density consolidated compacts (62% of the theoretical density (TD) for the bicomponent suspension). Optimum colloidal processing of the bicomponent suspension followed by the sintering of yttria and zirconia allowed us to obtain nanostructured tetragonal zirconia. Three different sintering techniques were investigated: normal sintering, two-step sintering and spark plasma sintering. The inhibition of grain growth in the bicomponent mixed powders in comparison with 3YTZ was demonstrated. The inhibition of the grain growth may have been caused by inter-diffusion of cations during the sintering.
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Affiliation(s)
- Gustavo Suárez
- Fine Particle Processing Group, Nano Ceramics Center, National Institute for Materials Science (NIMS), 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
- Technological Center of Mineral Resources and Ceramics, CETMIC, Camino Centenario y 506, Gonnet, Argentina
| | - Yoshio Sakka
- Fine Particle Processing Group, Nano Ceramics Center, National Institute for Materials Science (NIMS), 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
- WPI-MANA World Premier International Research Center Initiative, Center for Materials Nanoarchitectonics, NIMS, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Tohru S Suzuki
- Fine Particle Processing Group, Nano Ceramics Center, National Institute for Materials Science (NIMS), 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Tetsuo Uchikoshi
- Fine Particle Processing Group, Nano Ceramics Center, National Institute for Materials Science (NIMS), 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Xinwen Zhu
- Graduate School of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
| | - Esteban F Aglietti
- Technological Center of Mineral Resources and Ceramics, CETMIC, Camino Centenario y 506, Gonnet, Argentina
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Horii S, Ishihara A, Fukushima T, Uchikoshi T, Ogino H, Suzuki TS, Sakka Y, Shimoyama JI, Kishio K. Magnetic orientation and magnetic anisotropy in paramagnetic layered oxides containing rare-earth ions. Sci Technol Adv Mater 2009; 10:014604. [PMID: 27877255 PMCID: PMC5109596 DOI: 10.1088/1468-6996/10/1/014604] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2008] [Revised: 05/22/2009] [Accepted: 10/27/2008] [Indexed: 06/06/2023]
Abstract
The magnetic anisotropies and easy axes of magnetization at room temperature were determined, and the effects of rare-earth (RE) ions were clarified for RE-based cuprates, RE-doped bismuth-based cuprates and RE-doped Bi-based cobaltite regarding the grain orientation by magnetic field. The easy axis, determined from the powder orientation in a static field of 10 T, depended qualitatively on the type of RE ion for all three systems. On the other hand, the magnetization measurement of the c-axis oriented powders, aligned in static or rotating fields, revealed that the type of RE ion strongly affected not only the directions of the easy axis but also the absolute value of magnetic anisotropy, and an appropriate choice of RE ion is required to minimize the magnetic field used for grain orientation. We also studied the possibility of triaxial grain orientation in high-critical-temperature superconductors by a modulated oval magnetic field. In particular, triaxial orientation was attempted in a high-oxygen-pressure phase of orthorhombic RE-based cuprates Y2Ba4Cu7O y . Although the experiment was performed in epoxy resin, which is not practical, in-plane alignment within 3° was achieved.
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Affiliation(s)
- Shigeru Horii
- Department of Applied Chemistry, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Atsushi Ishihara
- Department of Applied Chemistry, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Takayuki Fukushima
- Department of Applied Chemistry, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tetsuo Uchikoshi
- Nano Ceramics Center, National Institute for Materials Science, Tsukuba, Ibaraki 277-8561, Japan
| | - Hiraku Ogino
- Department of Applied Chemistry, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tohru S Suzuki
- Nano Ceramics Center, National Institute for Materials Science, Tsukuba, Ibaraki 277-8561, Japan
| | - Yoshio Sakka
- Nano Ceramics Center, National Institute for Materials Science, Tsukuba, Ibaraki 277-8561, Japan
| | - Jun-ichi Shimoyama
- Department of Applied Chemistry, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kohji Kishio
- Department of Applied Chemistry, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Furumi S, Uchikoshi T, Shirahata N, Suzuki TS, Sakka Y. Aqueous dispersions of carbon nanotubes stabilized by zirconium acetate. J Nanosci Nanotechnol 2009; 9:662-665. [PMID: 19441366 DOI: 10.1166/jnn.2009.j004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This report describes a simple strategy for preparing dispersion of multi-walled carbon nanotubes (MWCNTs) in water. Zirconium acetate (ZrAc3) was used as a dispersant for the MWCNTs in water. Interestingly, an aqueous dispersion of MWCNTs was stabilized by adding an extremely small amount of ZrAc3, followed by ultrasonic agitation. The resultant MWCNT dispersion was durably retained even after storing at room temperature over 6 months. The dispersion state of MWCNTs on a substrate was observed by means of reflection optical and scanning electron microscopes. Furthermore, we demonstrated the effect of external high magnetic field on the orientation of MWCNTs on the substrate surface from the aqueous dispersion.
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Affiliation(s)
- Seiichi Furumi
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
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Suzuki TS, Sakka Y, Nakano K, Hiraga K. Effect of Ultrasonication on Colloidal Dispersion of Al 2O 3 and ZrO 2 Powders in pH Controlled Suspension. ACTA ACUST UNITED AC 1998. [DOI: 10.2320/matertrans1989.39.689] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Suzuki TS, Miura Y, Mizoguchi H, Takaku F. Effect of erythropoietin on the spleen of the polycythemic mouse in vitro. V. Localization of erythropoietin-responsive cells in the spleen. Exp Cell Res 1973; 82:27-30. [PMID: 4751982 DOI: 10.1016/0014-4827(73)90240-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Suzuki TS, Fukushi Y, Suzuki T. Effect of "substance R" on the membrane potential of smooth muscle cell of guinea-pig taenia coli. TOHOKU J EXP MED 1973; 110:407-8. [PMID: 4764147 DOI: 10.1620/tjem.110.407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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