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Egorysheva A, Kraev A, Gajtko O, Kusova T, Baranchikov A, Agafonov A, Ivanov V. High electrorheological effect in Bi1.8Fe1.2SbO7 suspensions. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.10.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Xiang L, Zhao X. Wet-Chemical Preparation of TiO₂-Based Composites with Different Morphologies and Photocatalytic Properties. NANOMATERIALS 2017; 7:nano7100310. [PMID: 28991208 PMCID: PMC5666475 DOI: 10.3390/nano7100310] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 09/30/2017] [Accepted: 10/02/2017] [Indexed: 12/25/2022]
Abstract
TiO2-based composites have been paid significant attention in the photocatalysis field. The size, crystallinity and nanomorphology of TiO2 materials have an important effect on the photocatalytic efficiency. The synthesis and photocatalytic activity of TiO2-based materials have been widely investigated in past decades. Based on our group’s research works on TiO2 materials, this review introduces several methods for the fabrication of TiO2, rare-earth-doped TiO2 and noble-metal-decorated TiO2 particles with different morphologies. We focused on the preparation and the formation mechanism of TiO2-based materials with unique structures including spheres, hollow spheres, porous spheres, hollow porous spheres and urchin-like spheres. The photocatalytical activity of urchin-like TiO2, noble metal nanoparticle-decorated 3D (three-dimensional) urchin-like TiO2 and bimetallic core/shell nanoparticle-decorated urchin-like hierarchical TiO2 are briefly discussed.
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Affiliation(s)
- Liqin Xiang
- Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710129, China.
| | - Xiaopeng Zhao
- Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710129, China.
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Agafonov AV, Krayev AS, Davydova OI, Ivanov KV, Shekunova TO, Baranchikov AE, Ivanova OS, Borilo LP, Garshev AV, Kozik VV, Ivanov VK. Nanocrystalline ceria: a novel material for electrorheological fluids. RSC Adv 2016. [DOI: 10.1039/c6ra15095k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nanocrystalline CeO2 shows intriguing electroheological performance.
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Affiliation(s)
- A. V. Agafonov
- Krestov Institute of Solution Chemistry of the Russian Academy of Sciences
- Ivanovo
- Russia
- National Research Tomsk State University
- Tomsk
| | - A. S. Krayev
- Krestov Institute of Solution Chemistry of the Russian Academy of Sciences
- Ivanovo
- Russia
| | - O. I. Davydova
- Krestov Institute of Solution Chemistry of the Russian Academy of Sciences
- Ivanovo
- Russia
| | - K. V. Ivanov
- Krestov Institute of Solution Chemistry of the Russian Academy of Sciences
- Ivanovo
- Russia
| | - T. O. Shekunova
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
- Moscow
- Russia
- Lomonosov Moscow State University
- Moscow
| | - A. E. Baranchikov
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
- Moscow
- Russia
- Lomonosov Moscow State University
- Moscow
| | - O. S. Ivanova
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
- Moscow
- Russia
| | - L. P. Borilo
- National Research Tomsk State University
- Tomsk
- Russia
| | | | - V. V. Kozik
- National Research Tomsk State University
- Tomsk
- Russia
| | - V. K. Ivanov
- National Research Tomsk State University
- Tomsk
- Russia
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
- Moscow
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Akhtar MS, Li ZY, Park DM, Oh DW, Kwak DH, Yang OB. A new carbon nanotubes (CNTs)–poly acrylonitrile (PAN) composite electrolyte for solid state dye sensitized solar cells. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2011.08.082] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Qiao Y, Zhao X, Su Y. Dielectric metamaterial particles with enhanced efficiency of mechanical/electrical energy transformation. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm02002h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Liu F, Xu G, Wu J, Cheng Y, Guo J, Cui P. Synthesis and electrorheological properties of oxalate group-modified amorphous titanium oxide nanoparticles. Colloid Polym Sci 2010. [DOI: 10.1007/s00396-010-2291-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Hao L, Ding C, Zhao X. A novel electric elastomer based on starch/transformer oil drop/silicone rubber hybrid. J Appl Polym Sci 2010. [DOI: 10.1002/app.33038] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Qiao Y, Zhao X. Electrorheological effect of carbonaceous materials with hierarchical porous structures. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2009.02.036] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Hao L, Shi Z, Zhao X. Mechanical behavior of starch/silicone oil/silicone rubber hybrid electric elastomer. REACT FUNCT POLYM 2009. [DOI: 10.1016/j.reactfunctpolym.2008.12.014] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Monodisperse micrometer-ranged poly(methyl methacrylate) hybrid particles coated with a uniform silica layer. Macromol Res 2008. [DOI: 10.1007/bf03218536] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Gao ZW, Zhao XP. Guest-controlling effects on ER behaviors of beta-cyclodextrin polymer. J Colloid Interface Sci 2006; 289:56-62. [PMID: 16009217 DOI: 10.1016/j.jcis.2005.03.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2003] [Revised: 03/11/2005] [Accepted: 03/14/2005] [Indexed: 11/23/2022]
Abstract
An effective and novel approach to obtaining electrorheological particles with high performance through the formation of host-guest complexes has been achieved. The significant preponderance of the host-guest complex formation is that the host structure can be controlled easily by adding different guests. Based on this point, six supramolecular complexes of beta-cyclodextrin cross-linking polymer with salicylic acid (beta-CDP-1), 5-chlorosalicylic acid (beta-CDP-2), 3,5-dichlorosalicylic acid (beta-CDP-3), 5-nitrosalicylic acid (beta-CDP-4), 3,5-dinitrosalicylic acid (beta-CDP-5), or 3-hydroxy-2-naphthoic acid (beta-CDP-6) particles were synthesized. The electrorheological yield stresses of the suspensions of these particles in silicone oil have been investigated under DC electric fields. It was found that the yield stress of the typical beta-CDP-1 ER fluid was 5.6 kPa in 4 kV/mm, which is much higher than that of pure beta-cyclodextrin polymer (beta-CDP), that of pure salicylic acid as well as that of the mixture of the host with the guest. It is clearly indicated that the formation of supramolecular complexes between beta-CDP and salicylic acid can enhance the ER properties of the host. The similar results for other supramolecular complexes with different guests have also been obtained under the same DC electric fields. The yield stress of supramolecular complexes is strongly affected by the structure of guests. Among the six investigated guests, 3-hydroxy-2-naphthoic acid gave the highest ER property having a yield stress of 9.8 kPa under 4 kV/mm DC while cross-linked with beta-CDP to form beta-CDP-6. The yield stress of beta-CDP-6 was significantly increased by 72% in comparison with that of the pure beta-CDP. However, the yield stress of beta-CDP-1-5 slightly increased by 34-41% as compared with that of the pure beta-CDP. The achieved results indicate that the ER effect of host-guest complexes can be greatly affected by the changes of the tremendous guest structure, whereas the slight guest structural transposition, such as altering different groups of a guest, can only obtain the adjacent electrorheological behavior. The dielectric properties of these host-guest complexes also proved that the ER effect can be affected by the properties of guest.
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Affiliation(s)
- Zi-Wei Gao
- Institute of Electrorheological Technology 141#, Department of Applied Physics, Northwestern Polytechnical University, Xi'an, People's Republic of
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Yin JB, Zhao XP. Enhanced Electrorheological Activity of Mesoporous Cr-Doped TiO2 from Activated Pore Wall and High Surface Area. J Phys Chem B 2006; 110:12916-25. [PMID: 16805592 DOI: 10.1021/jp0554588] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
To enhance electrorheological (ER) activity by improving interfacial polarization, we prepared a new mesoporous Cr-doped TiO2 ER material by a copolymer-templated sol-gel method. The material was characterized by differential scanning calorimeter and thermogravimetric (DSC-TG) analysis, Fourier transform infrared (FT-IR), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption, and X-ray photoelectron spectroscopy (XPS) techniques. The ER activity was studied by the rheological curve and yield stress under an electric field. The results showed that the mesoporous Cr-doped TiO2 ER material possessed a high surface area over 200 m2/g and a crystalline anatase pore wall doped by different valent Cr ions. The ER activity of mesoporous Cr-doped TiO2 was higher than that of nonporous Cr-doped TiO2. The yield stress and ER efficiency of the mesoporous Cr-doped TiO2 ER suspension was 3 times as high as that of the nonporous Cr-doped TiO2 ER suspension, 7 times as high as that of the mesoporous undoped TiO2 ER suspension, and 20 times as high as that of the nonporous pure TiO2 ER suspension. Furthermore, the ER activity of mesoporous Cr-doped TiO2 showed a dependence on surface area, and the high porosity or surface area samples showed higher ER activity. The dielectric spectra analysis showed that the mesoporous Cr-doped TiO2 ER suspension possessed a significantly larger interfacial polarizability compared with the nonporous Cr-doped TiO2 ER suspension, and the regular change of polarizability with surface area or porosity was in accordance with the change of ER activity with surface area or porosity. The improvement of dielectric properties or polarization could well explain the enhancement of the ER activity of mesoporous Cr-doped TiO2.
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Affiliation(s)
- Jian B Yin
- Institute of Electrorheological Technology, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
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Universal yield stress function for biocompatible chitosan based-electrorheological fluid: Effect of particle concentration. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.10.133] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Lu J, Zhao X. A new approach of enhancing the shear stress of electrorheological fluids of montmorillonite nanocomposite by emulsion intercalation of poly-N-methaniline. J Colloid Interface Sci 2005; 273:651-7. [PMID: 15082406 DOI: 10.1016/j.jcis.2004.02.066] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2003] [Accepted: 02/25/2004] [Indexed: 10/26/2022]
Abstract
Poly-N-methaniline/montmorillonite (PNMA-MMT) nanocomposite particles with high dielectric constant as well as suitable conductivity were synthesized by an emulsion intercalation method and characterized by FT-IR, XRD, and TEM spectrometry, respectively. The electrorheological (ER) properties of the suspensions of PNMA-MMT particles in silicone oil (20 wt%) were investigated under DC electric fields. It was found that the shear stress of poly-N-methaniline/montmorillonite electrorheological fluid (ERF) is 6.0 kPa in 3 kV/mm (74.5 s(-1)), which is 3.6 times that of electrorheological fluid at zero field, and also much higher than that of pure poly-N-methaniline (PNMA) and montmorillonite (MMT). In the range of 10-90 degrees C, the shear stress changes slightly with the temperature. The sedimentation ratio of PNMA-MMT ERF was about 97% after 60 days. Furthermore, the dielectric constant of PNMA-MMT nanocomposite was increased 3.74 times that of PNMA and 1.99 times that of MMT at 1000 Hz, the dielectric loss tangent also increased about 1.58 times that of PNMA. It is apparent that the notable ER effect of PNMA-MMT ER fluid was attributed to the prominent dielectric property of the poly-N-methaniline/montmorillonite nanocomposite particles.
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Affiliation(s)
- Jun Lu
- Institute of Electrorheological Technology, Department of Applied Physics 141, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
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Preparation and electrorheological characteristic of Y-doped BaTiO3 suspension under dc electric field. J SOLID STATE CHEM 2004. [DOI: 10.1016/j.jssc.2004.06.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Gao L, Zhao X. Electrorheological behaviors of barium titanate/gelatin composite hydrogel elastomers. J Appl Polym Sci 2004. [DOI: 10.1002/app.21212] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Gao Z, Zhao X. Preparation and electrorheological characteristics of ?-cyclodextrin-epichlorohydrin-starch polymer suspensions. J Appl Polym Sci 2004. [DOI: 10.1002/app.20598] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Gao Z, Zhao X. Enhancing electrorheological behaviors with formation of β-cyclodextrin supramolecular complex. POLYMER 2003. [DOI: 10.1016/s0032-3861(03)00416-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Yin JB, Zhao XP. Electrorheological fluids based on glycerol-activated titania gel particles and silicone oil with high yield strength. J Colloid Interface Sci 2003; 257:228-36. [PMID: 16256474 DOI: 10.1016/s0021-9797(02)00041-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2002] [Accepted: 10/22/2002] [Indexed: 11/28/2022]
Abstract
This article describes an electrorheological (ER) fluid based on glycerol-activated titania organic-inorganic hybrid gel particles and silicone oil with high yield strength. Based on a physical picture of a water-activated ER system, glycerol that has a high dielectric constant and boiling point is in situ prepared in the amorphous titania gel during the sol-gel processing. A small amount of ionic surfactant hexadecyltrimethylammonium bromide (CTAB) is employed to enhance charge carriers in particles. FTIR and XRD techniques are used to determine the nature and structure of the hybrid gel. Rheology test results show that a large static yield stress greater than 12.6 kPa is obtained when 3 kV/mm dc electric field is applied. This value is close to the value predicted by H. Conrad (MRS Bull. 8 (1998) 35) in theory. Furthermore, dynamic shear stress as a function of shear rate and temperature is also investigated. This ER fluid exhibits strong temperature dependence and a wide working temperature range from 0 to 120 degrees C, while its leaking current density is still low. More interesting is that the glycerol content is demonstrated to have an influence on ER effect and temperature dependence. Measurement of the dielectric properties of ER fluids shows enhancement of the dielectric constant and dielectric loss due to addition of glycerol and a regular dependence of them on temperature, which well explains the strong ER effect.
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Affiliation(s)
- Jian Bo Yin
- Institute of Electrorheological Technology, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, PR China
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Wang BX, Zhao XP. Electrorheological effect coordinated by kaolinite–carboxymethyl starch hybrid materials. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b207566k] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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