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Chen X, Hosseini SN, van Huis MA. Heating-Induced Transformation of Anatase TiO 2 Nanorods into Rock-Salt TiO Nanoparticles: Implications for Photocatalytic and Gas-Sensing Applications. ACS APPLIED NANO MATERIALS 2022; 5:1600-1606. [PMID: 35128341 PMCID: PMC8805116 DOI: 10.1021/acsanm.1c04346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 12/27/2021] [Indexed: 06/14/2023]
Abstract
Anatase TiO2 nanocrystals (NCs) play a vital role in photocatalytic applications due to their high catalytic activity and in gas-sensing applications due to their high chemical sensitivity. Here, we report the transformation at elevated temperature of anatase nanorods (NRs) with a length of 25 nm into rock-salt TiO nanoparticles with an average size of 9.2 ± 2.1 nm investigated by means of in situ heating in the transmission electron microscope. The NRs were completely transformed to titanium monoxide NCs after heating to a temperature of 1200 °C. We also identified an intermediate stage in the temperature range of 950-1200 °C, during which not only the anatase and rock-salt phases were found but also the brookite phase. Understanding of the phase and morphology evolution at high temperatures is of essence to the functionality of the NRs in various applications, as discussed in this work. Moreover, the high-temperature transformation to titanium monoxide is of interest as rock-salt TiO (γ-TiO) is known to exhibit superconducting properties. We propose the heating-induced transformation as a physical route to synthesize TiO NCs of very small size.
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2
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Meng X, Li X, Zhang Q, Zheng R, Wu L, Cao F. Interfacial Adsorption and Electron Properties of Water Molecule/Cluster on Anatase TiO 2(101) Surface: Raman and DFT Investigation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:1057-1066. [PMID: 35015544 DOI: 10.1021/acs.langmuir.1c02624] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The hydrogen bond network reconstruction at the titanium/water interface was monitored by Raman spectroscopy. In addition, the adsorption properties and the surface electron properties of hydrogen bond cluster (HBC) configurations were analyzed using adsorption energy, work function, Mulliken charge population, and density of states (DOS) by the first-principles method based on density functional theory (DFT). Our results show that the hydrogen bond network of the aqueous solution is reconstructed under the interaction with the anatase TiO2(101) surface with the transformation of the chain and free hydrogen bonds to complex hydrogen bonds. The adsorption energy of a single water molecule and HBC on the anatase TiO2(101) surface are the lowest with the 1-DD-h (-0.851 eV) and 3-D-h-DDA (-1.048 eV) configurations, respectively. Over the long term, artificially regulating the structure of the HBC might be an effective and general way to slow down the metal anodic reaction without surface modification. Furthermore, the surface charge concentrates on the bridging oxygen atom, which will be the active site of the interface reaction. It is helpful to clarify the anodic corrosion reaction mechanism of the titanium spontaneous oxide film/water interface.
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Affiliation(s)
- Xianze Meng
- School of Materials, Sun Yat-sen University, Guangzhou 510006, China
| | - Xinran Li
- School of Materials, Sun Yat-sen University, Guangzhou 510006, China
| | - Qinhao Zhang
- School of Materials, Sun Yat-sen University, Guangzhou 510006, China
| | - Runchao Zheng
- School of Materials, Sun Yat-sen University, Guangzhou 510006, China
| | - Liankui Wu
- School of Materials, Sun Yat-sen University, Guangzhou 510006, China
| | - Fahe Cao
- School of Materials, Sun Yat-sen University, Guangzhou 510006, China
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3
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The Effect of Polyethylene Glycol Addition on Wettability and Optical Properties of GO/TiO 2 Thin Film. MATERIALS 2021; 14:ma14164564. [PMID: 34443086 PMCID: PMC8399997 DOI: 10.3390/ma14164564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 08/09/2021] [Accepted: 08/09/2021] [Indexed: 11/17/2022]
Abstract
Modification has been made to TiO2 thin film to improve the wettability and the absorption of light. The sol-gel spin coating method was successfully used to synthesize GO/TiO2 thin films using a titanium (IV) isopropoxide (TTIP) as a precursor. Different amounts of polyethylene glycol (PEG) (20 to 100 mg) were added into the parent sol solution to improve the optical properties and wettability of the GO/TiO2 thin film. The effect of different amounts of PEG was characterized using X-ray diffraction (XRD) for the phase composition, scanning electron microscopy (SEM) for microstructure observation, atomic force microscopy (AFM) for the surface topography, ultraviolet–visible spectrophotometry (UV-VIS) for the optical properties and wettability of the thin films by measuring the water contact angle. The XRD analysis showed the amorphous phase. The SEM and AFM images revealed that the particles were less agglomerated and surface roughness increases from 1.21 × 102 to 2.63 × 102 nm when the amount of PEG increased. The wettability analysis results show that the water contact angle of the thin film decreased to 27.52° with the increase of PEG to 80 mg which indicated that the thin film has hydrophilic properties. The optical properties also improved significantly, where the light absorbance wavelength became wider and the band gap was reduced from 3.31 to 2.82 eV with the presence of PEG.
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Eco-Friendly Colloidal Aqueous Sol-Gel Process for TiO2 Synthesis: The Peptization Method to Obtain Crystalline and Photoactive Materials at Low Temperature. Catalysts 2021. [DOI: 10.3390/catal11070768] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
This work reviews an eco-friendly process for producing TiO2 via colloidal aqueous sol–gel synthesis, resulting in crystalline materials without a calcination step. Three types of colloidal aqueous TiO2 are reviewed: the as-synthesized type obtained directly after synthesis, without any specific treatment; the calcined, obtained after a subsequent calcination step; and the hydrothermal, obtained after a specific autoclave treatment. This eco-friendly process is based on the hydrolysis of a Ti precursor in excess of water, followed by the peptization of the precipitated TiO2. Compared to classical TiO2 synthesis, this method results in crystalline TiO2 nanoparticles without any thermal treatment and uses only small amounts of organic chemicals. Depending on the synthesis parameters, the three crystalline phases of TiO2 (anatase, brookite, and rutile) can be obtained. The morphology of the nanoparticles can also be tailored by the synthesis parameters. The most important parameter is the peptizing agent. Indeed, depending on its acidic or basic character and also on its amount, it can modulate the crystallinity and morphology of TiO2. Colloidal aqueous TiO2 photocatalysts are mainly being used in various photocatalytic reactions for organic pollutant degradation. The as-synthesized materials seem to have equivalent photocatalytic efficiency to the photocatalysts post-treated with thermal treatments and the commercial Evonik Aeroxide P25, which is produced by a high-temperature process. Indeed, as-prepared, the TiO2 photocatalysts present a high specific surface area and crystalline phases. Emerging applications are also referenced, such as elaborating catalysts for fuel cells, nanocomposite drug delivery systems, or the inkjet printing of microstructures. Only a few works have explored these new properties, giving a lot of potential avenues for studying this eco-friendly TiO2 synthesis method for innovative implementations.
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5
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Cendrowski K, Pachnowska K, Augustyniak A, Wierzbicka J, Pratnicki F, Kucharski P, Kukułka W, Mijowska E. The impact of environmental water on the potential application of core-shell titania-silica nanospheres as photocatalysts. NANOTECHNOLOGY 2021; 32:315703. [PMID: 33878741 DOI: 10.1088/1361-6528/abf9c5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 04/20/2021] [Indexed: 06/12/2023]
Abstract
In this study, the core-shell silica nanospheres modified with titanium dioxide were tested in the photocatalytic decomposition of dyes. The presented data underlines the advantages and shortcomings in the potential application of silica-based catalysts to neutralize organic pollutants. During the photocatalytic reaction in distilled water, catalysts showed decreased efficiency due to a carbon layer deposited on its surface. This finding set an additional goal to investigate the possibility of regenerating the photocatalyst. Studies have shown that the catalyst could be successfully reused following the thermal removal of deposited carbon.Furthermore, the reactivated silica-titania catalysts exhibited comparable photocatalytic performance to the newly made nanomaterial. Surprisingly, catalyst application in the river water eventually resulted in the permanent deactivation of silica-titania nanospheres, which was caused by the interchangeable silica dissolution/precipitation process on the surface of the studied nanomaterial. In environmental water, silica dissolves and precipitates on titanium dioxide's surface, blocking the interaction between organic compounds and TiO2. The deactivation occurring in the environmental samples is irreversible. In distilled water, the decomposition of organic compounds leads to photocatalysts' deactivation by forming a carbon layer on their surface. Reactivation of the silica-based photocatalyst after distilled water is achievable by annealing at a high temperature. In light of our findings, the combination of the photocatalytic properties of TiO2and the silica template shows no prospects in the purification of polluted waste or environmental water.
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Affiliation(s)
- Krzysztof Cendrowski
- Department of Nanomaterials Physicochemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Al. Piastów 45, Szczecin 70-311, Poland
- Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology, Szczecin, Al Piastów 50a, Szczecin 70-311, Poland
| | - Kamila Pachnowska
- Department of Nanomaterials Physicochemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Al. Piastów 45, Szczecin 70-311, Poland
- Department of Horticulture, Faculty of Environmental Management and Agriculture, West Pomeranian University of Technology, Szczecin, Juliusza Słowackiego 17, Szczecin 71-434, Poland
| | - Adrian Augustyniak
- Department of Chemical and Process Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Al. Piastów 42, 71-065 Szczecin, Poland
- Building Materials and Construction Chemistry, Technische Universität Berlin, Gustav-Meyer-Allee 25, D-13-355 Berlin, Germany
| | - Jagoda Wierzbicka
- Department of Nanomaterials Physicochemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Al. Piastów 45, Szczecin 70-311, Poland
| | - Filip Pratnicki
- Department of Nanomaterials Physicochemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Al. Piastów 45, Szczecin 70-311, Poland
- Institute of Physics, University of Szczecin, Wielkopolska 15, 70-451 Szczecin, Poland
| | - Pawel Kucharski
- Department of Nanomaterials Physicochemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Al. Piastów 45, Szczecin 70-311, Poland
| | - Wojciech Kukułka
- Department of Nanomaterials Physicochemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Al. Piastów 45, Szczecin 70-311, Poland
| | - Ewa Mijowska
- Department of Nanomaterials Physicochemistry, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Al. Piastów 45, Szczecin 70-311, Poland
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6
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Cordeiro DS, Cassio FL, Ciccotti L, Hewer TLR, Corio P, Freire RS. Photocatalytic activity of Pr-modified TiO2 for the degradation of bisphenol A. SN APPLIED SCIENCES 2021. [DOI: 10.1007/s42452-021-04284-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
AbstractPraseodymium doped TiO2 nanoparticles were successfully prepared by the sol–gel method and characterized by X-ray powder diffraction, N2 adsorption–desorption isotherm, and UV–vis spectroscopy. The effects of the dopant on the crystallite size, specific surface area, average pore diameter, pore volume, and bandgap energy were investigated. The photocatalytic activity of the catalysts was evaluated by bisphenol A degradation and mineralization, which is a representative endocrine disruptor. Furthermore, under visible light irradiation the Pr-modified TiO2 photocatalysts exhibited higher photocatalytic efficiency than unmodified TiO2. When praseodymium was loaded (1.0–5.0%) onto the surface of TiO2, the rates of degradation and mineralization were increased 3–5 times.
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7
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Hellner B, Stegmann AE, Pushpavanam K, Bailey MJ, Baneyx F. Phase Control of Nanocrystalline Inclusions in Bioprecipitated Titania with a Panel of Mutant Silica-Binding Proteins. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:8503-8510. [PMID: 32614593 DOI: 10.1021/acs.langmuir.0c01108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The biomimetic route to inorganic synthesis presents an opportunity to produce complex materials with superior properties under ambient conditions and from nontoxic precursors. While there has been significant progress in using solid-binding peptides (SBPs), proteins, and organisms to produce a variety of inorganic and hybrid structures, it has been more challenging to understand the interplay of solution conditions and solid-binding peptide (SBP) sequence, structure, and self-association on synthetic outcomes. Here, we show that fusing the Car9 silica-binding peptide-but not the silaffin-derived R5 peptide-to superfolder green fluorescent protein (sfGFP) enhances the ability of micromolar concentrations of protein to induce rapid titania (TiO2) precipitation from acidified solutions of tetrakis(di-lactato)-oxo-titanate (TiBALDH). TiO2 is produced stoichiometrically and although predominantly amorphous, contains nanosized anatase and monoclinic TiO2(B) inclusions. Remarkably, the phase of these nanocrystallites can be tuned from about 80% TiO2(B) to about 65% anatase by using Car9 mutants impaired in their ability to drive the formation of higher-order sfGFP-Car9 oligomers. Our results suggest that the presentation of multiple basic side chains in an extended plane formed by SBP self-association is critical to template the formation of monoclinic crystallites and underscore the subtle influence that single or dual substitutions in dodecameric SBPs can exert on the yield and crystallinity of biomineralized inorganics.
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Affiliation(s)
- Brittney Hellner
- Department of Chemical Engineering, University of Washington, P.O. Box 351750, Seattle, Washington 98195, United States
| | - Amy E Stegmann
- Department of Chemical Engineering and Molecular Engineering & Sciences Institute, University of Washington, P.O. Box 351750, Seattle, Washington 98195, United States
| | - Karthik Pushpavanam
- Department of Chemical Engineering, University of Washington, P.O. Box 351750, Seattle, Washington 98195, United States
| | - Matthew J Bailey
- Department of Chemical Engineering, University of Washington, P.O. Box 351750, Seattle, Washington 98195, United States
| | - François Baneyx
- Department of Chemical Engineering, University of Washington, P.O. Box 351750, Seattle, Washington 98195, United States
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8
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Kitamura N, Soejima T. Low-temperature One-pot Aqueous Synthesis and Application of Anatase/Rutile TiO 2 Composite Nanoparticles. CHEM LETT 2020. [DOI: 10.1246/cl.200137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Naoki Kitamura
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan
| | - Tetsuro Soejima
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan
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9
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Composite electrode of TiO2 particles with three kinds of crystal phases for significantly improved performance of dye-sensitized solar cells. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2020.110744] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Wang Y, Huang H, Du D, Dong Y, Feng Z, Wang Y, Sun T, Xu Y. A general strategy based on the self-evolution of building blocks for the construction of one-dimensional hierarchically super-structured TiO 2 fibres. CrystEngComm 2020. [DOI: 10.1039/d0ce00714e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We provide a general strategy based on the self-evolution of building blocks to fabricate one-dimensional hierarchically superstructured metal-doped titanate and TiO2 materials with coated-nanosheet and interconnected meso-/macropores.
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Affiliation(s)
- Yun Wang
- College of Sciences
- Northeastern University
- Shenyang
- China
- State Key Lab of Inorganic Synthesis and Preparative Chemistry
| | - Haibo Huang
- Dalian National Laboratory for Clean Energy
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences
- Dalian
- China
| | - Daoguang Du
- College of Sciences
- Northeastern University
- Shenyang
- China
| | - Yanfeng Dong
- College of Sciences
- Northeastern University
- Shenyang
- China
| | - Zhongmin Feng
- College of Sciences
- Northeastern University
- Shenyang
- China
| | - Yuanpeng Wang
- College of Food Science
- Shenyang Agricultural University
- Shenyang
- China
| | - Ting Sun
- College of Sciences
- Northeastern University
- Shenyang
- China
| | - Yan Xu
- State Key Lab of Inorganic Synthesis and Preparative Chemistry
- Jilin University
- Changchun
- China
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11
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Salahuddin N, Abdelwahab M, Gaber M, Elneanaey S. Synthesis and Design of Norfloxacin drug delivery system based on PLA/TiO 2 nanocomposites: Antibacterial and antitumor activities. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 108:110337. [PMID: 31923987 DOI: 10.1016/j.msec.2019.110337] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 09/23/2019] [Accepted: 10/16/2019] [Indexed: 01/08/2023]
Abstract
Biodegradable, biocompatible and non-toxic polymer-based nanoparticles are the novel nanotherapeutic tool which is used for adsorption and encapsulation drugs. Extended release formulation of Norfloxacin antibiotic, chemotherapeutic agent model, drug in the form of encapsulated and loaded poly (lactic acid) nanocomposites-based Titanium dioxide (PLA/TiO2) was developed. Nanocomposites were prepared using different contents (1, 3, 5 wt %) and morphologies of TiO2 (spheres (S), rods (R). The dispersion of TiO2 was aided by ultrasonic technique followed by solution casting method. The morphology, particle size, crystallite size and composition of the nanocomposites were examined by SEM, TEM, XRD and FTIR. The crystallinity and thermal behavior of the nanocomposites were characterized by DSC and TGA. NOR was loaded onto TiO2 nanospheres (NOR@TiO2 (S)) and the optimum conditions for loading was investigated. Pseudo-second order model was the more adequate to represent the kinetic data. The equilibrium data followed Freundlich adsorption isotherm and the adsorption process was exothermic. NOR@TiO2 (S) was encapsulated into PLA and in vitro release behavior of drug was compared with NOR adsorbed into PLA (NOR@PLA) and nanocomposites (NOR@PLA/TiO2) using different pH (6.7, 7.4) media. To study the mechanism of NOR release, first order, Higuchi, Hixon Crowell and Korsmeyer-Peppas models were applied on the experimental results. The cytotoxicity of the loaded nanocomposites using MTT assay was studied against HepG 2, MCF-7, HCT 116, PC-3, Hela, WI-38 and WISH cells. The encapsulated (NOR@ 5S/En PLA) showed the highest cytotoxic efficacy with moderate effect on normal cells. Moreover, the nanocomposites have great potential against Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Salmonella and Klebsiella pneumonia. NOR@ PLA/TiO2 nanocomposites showed better antibacterial efficacy than NOR encapsulated nanocomposites. The nanocomposites could be effective vehicles for the sustained delivery of toxic anticancer drug.
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Affiliation(s)
- Nehal Salahuddin
- Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt.
| | - Mohamed Abdelwahab
- Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
| | - Mohamed Gaber
- Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
| | - Sahar Elneanaey
- Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
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12
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Investigation of growth mechanism for highly oriented TiO2 nanorods: the role of reaction time and annealing temperature. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-0978-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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13
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Mohamad Alosfur FK, Ridha NJ, Jumali MHH, Radiman S. One-step formation of TiO 2 hollow spheres via a facile microwave-assisted process for photocatalytic activity. NANOTECHNOLOGY 2018; 29:145707. [PMID: 29384494 DOI: 10.1088/1361-6528/aaabee] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Mesoporous TiO2 hollow spherical nanostructures with high surface areas were successfully prepared using a microwave method. The prepared hollow spheres had a size range between 200 and 500 nm. The spheres consisted of numerous smaller TiO2 nanoparticles with an average diameter of 8 nm. The particles had an essentially mesoporous structure, with a pore size in the range of 2-50 nm. The results confirmed that the synthesised of anatase TiO2 nanoparticles with specific surface area approximately 172.3 m2 g-1. The effect of ultraviolet and visible light irradiation and catalyst dosage on the TiO2 photocatalytic activity was studied by measuring the degradation rate of methylene blue. The maximum dye degradation performances with low catalyst loading (30 mg) were 99% and 63.4% using the same duration of ultraviolet and visible light irradiation, respectively (120 min).
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14
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Synthesis of anatase/brookite TiO2–Bi2WO6 multiheterojunction and its photocatalytic properties under visible-light irradiation. RESEARCH ON CHEMICAL INTERMEDIATES 2018. [DOI: 10.1007/s11164-018-3291-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Byzynski G, Pereira AP, Volanti DP, Ribeiro C, Longo E. High-performance ultraviolet-visible driven ZnO morphologies photocatalyst obtained by microwave-assisted hydrothermal method. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.11.032] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Trejo-Tzab R, Caballero-Espada L, Quintana P, Ávila-Ortega A, Medina-Esquivel RA. Controlled Phase Changes of Titania Using Nitrogen Plasma. NANOSCALE RESEARCH LETTERS 2017; 12:32. [PMID: 28091944 PMCID: PMC5236039 DOI: 10.1186/s11671-016-1821-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 12/23/2016] [Indexed: 06/06/2023]
Abstract
In this work, the development of a new crystallization technique is reported, using nitrogen plasma (AC) to obtain nanostructured anatase and rutile from amorphous titanium oxide (TiO2). This methodology increases throughput and minimizes thermal effects. Nanostructured amorphous TiO2 was obtained by the sol-gel method and subsequently subjected to AC treatment, at a controlled pressure, applying different powers and treatment times in order to obtain phase changes. The obtained samples were characterized using X-ray diffraction (XRD), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The results show the crystallization in parallel with anatase and rutile phases with a proportion that is directly related to the applied power in the plasma and the treatment time. This technique allows us to obtain smaller crystals in comparison with those of classic thermal methodologies. It is also demonstrated that the application of plasma represents a novel and innovative method to obtain phase polymorphic changes in titanium oxide without needing to apply prolonged heat treatments at high temperatures and can therefore be taken into consideration as a technique with low energy costs, in comparison with conventional heat treatments.
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Affiliation(s)
- R Trejo-Tzab
- Facultad de Ingeniería Química, Universidad Autónoma de Yucatán, Mérida, Yucatán, 97203, México.
| | | | - P Quintana
- Depto. de Física Aplicada, CINVESTAV-Unidad Mérida, A.P. 73, Cordemex, 97310, Mérida, Yucatán, México
| | - Alejandro Ávila-Ortega
- Facultad de Ingeniería Química, Universidad Autónoma de Yucatán, Mérida, Yucatán, 97203, México
| | - R A Medina-Esquivel
- Facultad de Ingeniería, Universidad Autónoma de Yucatán, Mérida, Yucatán, 97203, México
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17
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Huang SD, Shang C, Zhang XJ, Liu ZP. Material discovery by combining stochastic surface walking global optimization with a neural network. Chem Sci 2017; 8:6327-6337. [PMID: 29308174 PMCID: PMC5628601 DOI: 10.1039/c7sc01459g] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Accepted: 06/29/2017] [Indexed: 11/21/2022] Open
Abstract
While the underlying potential energy surface (PES) determines the structure and other properties of a material, it has been frustrating to predict new materials from theory even with the advent of supercomputing facilities. The accuracy of the PES and the efficiency of PES sampling are two major bottlenecks, not least because of the great complexity of the material PES. This work introduces a "Global-to-Global" approach for material discovery by combining for the first time a global optimization method with neural network (NN) techniques. The novel global optimization method, named the stochastic surface walking (SSW) method, is carried out massively in parallel for generating a global training data set, the fitting of which by the atom-centered NN produces a multi-dimensional global PES; the subsequent SSW exploration of large systems with the analytical NN PES can provide key information on the thermodynamics and kinetics stability of unknown phases identified from global PESs. We describe in detail the current implementation of the SSW-NN method with particular focuses on the size of the global data set and the simultaneous energy/force/stress NN training procedure. An important functional material, TiO2, is utilized as an example to demonstrate the automated global data set generation, the improved NN training procedure and the application in material discovery. Two new TiO2 porous crystal structures are identified, which have similar thermodynamics stability to the common TiO2 rutile phase and the kinetics stability for one of them is further proved from SSW pathway sampling. As a general tool for material simulation, the SSW-NN method provides an efficient and predictive platform for large-scale computational material screening.
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Affiliation(s)
- Si-Da Huang
- Collaborative Innovation Center of Chemistry for Energy Material , Key Laboratory of Computational Physical Science (Ministry of Education) , Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials , Department of Chemistry , Fudan University , Shanghai 200433 , China .
| | - Cheng Shang
- Collaborative Innovation Center of Chemistry for Energy Material , Key Laboratory of Computational Physical Science (Ministry of Education) , Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials , Department of Chemistry , Fudan University , Shanghai 200433 , China .
| | - Xiao-Jie Zhang
- Collaborative Innovation Center of Chemistry for Energy Material , Key Laboratory of Computational Physical Science (Ministry of Education) , Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials , Department of Chemistry , Fudan University , Shanghai 200433 , China .
| | - Zhi-Pan Liu
- Collaborative Innovation Center of Chemistry for Energy Material , Key Laboratory of Computational Physical Science (Ministry of Education) , Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials , Department of Chemistry , Fudan University , Shanghai 200433 , China .
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18
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Fadillah G, Wahyuningsih S, Ramelan AH. Enhanced Photovoltaic Performance by Surface Modification of TiO2 Nanorods with Aminopropyltrimethoxysilane (APTMS). ACTA ACUST UNITED AC 2017. [DOI: 10.1088/1755-1315/75/1/012005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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19
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Wang Y, Huang H, Li G, Zhao X, Yu L, Zou C, Xu Y. Electrospun TiO2–SiO2 fibres with hierarchical pores from phase separation. CrystEngComm 2017. [DOI: 10.1039/c7ce00471k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Wang G, Huang Y, Wang Y, Jiang P, Huang X. Substantial enhancement of energy storage capability in polymer nanocomposites by encapsulation of BaTiO3 NWs with variable shell thickness. Phys Chem Chem Phys 2017; 19:21058-21068. [DOI: 10.1039/c7cp04096b] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
BaTiO3 nanowires encapsulated by TiO2 shells of variable thickness were utilized to fabricate dielectric polymer nanocomposites.
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Affiliation(s)
- Guanyao Wang
- Department of Polymer Science and Engineering
- Shanghai Key Laboratory of Electrical Insulation and Thermal Aging
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Yanhui Huang
- Department of Materials Science and Engineering
- Rensselaer Polytechnic Institute
- Troy
- USA
| | - Yuxin Wang
- Department of Polymer Science and Engineering
- Shanghai Key Laboratory of Electrical Insulation and Thermal Aging
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Pingkai Jiang
- Department of Polymer Science and Engineering
- Shanghai Key Laboratory of Electrical Insulation and Thermal Aging
- Shanghai Jiao Tong University
- Shanghai 200240
- China
| | - Xingyi Huang
- Department of Polymer Science and Engineering
- Shanghai Key Laboratory of Electrical Insulation and Thermal Aging
- Shanghai Jiao Tong University
- Shanghai 200240
- China
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21
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Rajput NS, Kim SG, Chou JB, Abed J, Viegas J, Jouiad M. Electron beam induced rapid crystallization of water splitting nanostructures. ACTA ACUST UNITED AC 2016. [DOI: 10.1557/adv.2015.20] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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22
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Xu J, Wu S, Jin J, Peng T. Preparation of brookite TiO 2 nanoparticles with small sizes and the improved photovoltaic performance of brookite-based dye-sensitized solar cells. NANOSCALE 2016; 8:18771-18781. [PMID: 27801467 DOI: 10.1039/c6nr07185f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Brookite TiO2 nanoparticles with small sizes (hereafter denoted as BTP particles) were synthesized through the hydrothermal treatment of TiCl4 solution with Pb(NO3)2 as an additive. The obtained BTP particles have a large specific surface area (∼122.2 m2 g-1) and relatively uniform particle sizes (∼10 nm) with the coexistence of a small quantity of nanorods with a length of ∼100 nm. When used as a photoanode material for dye-sensitized solar cells (DSSCs), the BTP particles show a much higher dye-loading content than the brookite TiO2 quasi nanocubes (denoted as BTN particles) with a mean size of ∼50 nm and a specific surface area of ∼34.2 m2 g-1 that were prepared through a similar hydrothermal process but without the addition of Pb(NO3)2. The fabricated BTP film-based solar cell with an optimized film thickness gives a conversion efficiency up to 6.36% with a 74% improvement when compared to the BTN film-based one (3.65%) under AM 1.5G one sun irradiation, while the corresponding bilayer brookite-based solar cell by using brookite TiO2 submicrometer particles as an overlayer of the BTP film displays a significantly enhanced efficiency of 7.64%. Both of them exceed the current record (5.97%) for the conversion efficiency of pure brookite-based DSSCs reported in the literature. The present results not only demonstrate a really simple synthesis of brookite TiO2 nanoparticles with both high phase purity and a large surface area, but also offer an efficient approach to improve the photovoltaic performance of brookite-based solar cells by offsetting brookite's inherent shortages such as lower dye-loading and poor conductivity as compared to anatase.
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Affiliation(s)
- Jinlei Xu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
| | - Shufang Wu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
| | - Jingpeng Jin
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
| | - Tianyou Peng
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
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23
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Zhang G, Sun M, Liu Y, Lang X, Liu L, Liu H, Qu J, Li J. Visible-light induced photocatalytic activity of electrospun-TiO2 in arsenic(III) oxidation. ACS APPLIED MATERIALS & INTERFACES 2015; 7:511-518. [PMID: 25493554 DOI: 10.1021/am506640k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In practical implementation of TiO2 semiconductors, utilization of their outstanding properties is mainly hindered by poor material quality and high operational costs. In this contribution, the electrospinning method was employed to fabricate N-doped mixed-crystalline TiO2 with exposed high-energy facets. The Ti oxide transformation process was thoroughly studied. During the mixed crystal structure formation process, the high-energy facets could be preserved due to the lower calcination temperature and the protective role of polyvinylpyrrolidone (PVP) in the electrospinning process. In addition, after calcination, the N doping, generated by the decomposition of PVP, extended the absorption spectrum of TiO2 to the visible region. These TiO2 fibers exhibited superior photooxidation of arsenite (III) to arsenate (V)in both the UV and visible light regions, mainly attributed to the exposure of high-energy facets, robust separation of photoexcited charge carriers between the anatase/rutile phases, and narrow band gap induced by the in situ N doping. Combining both robustness and scalability, the TiO2 fibers produced via this electrospinning process have the potential for a broad range of applications.
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Affiliation(s)
- Gong Zhang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, China
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24
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Huang L, Jia J, Liu H, Yuan Y, Zhao J, Chen S, Fan W, Waclawik ER, Zhu H, Zheng Z. Surface-mediated selective photocatalytic aerobic oxidation reactions on TiO2 nanofibres. RSC Adv 2015. [DOI: 10.1039/c5ra07518a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The interaction between photocatalyst surface and the reactants may outweigh its light absorption ability in photocatalytic activities.
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Affiliation(s)
- Lizhi Huang
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Jianfeng Jia
- The School of Chemical and Material Science
- Shanxi Normal University
- Linfen 041004
- China
| | - Hongwei Liu
- School of Chemistry
- Physics and Mechanical Engineering Queensland University of Technology
- Brisbane
- Australia
| | - Yong Yuan
- National Engineering Research Center of Clean Coal Combustion
- Xi'an Thermal Power Research Institute Co. Ltd
- Xi'an 710032
- P. R. China
| | - Jian Zhao
- School of Chemistry
- Physics and Mechanical Engineering Queensland University of Technology
- Brisbane
- Australia
| | - Shuai Chen
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Weibin Fan
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Eric R. Waclawik
- School of Chemistry
- Physics and Mechanical Engineering Queensland University of Technology
- Brisbane
- Australia
| | - Huaiyong Zhu
- School of Chemistry
- Physics and Mechanical Engineering Queensland University of Technology
- Brisbane
- Australia
| | - Zhanfeng Zheng
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
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25
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Jagadeesh babu V, Vempati S, Ertas Y, Uyar T. Excitation dependent recombination studies on SnO2/TiO2 electrospun nanofibers. RSC Adv 2015. [DOI: 10.1039/c5ra09787h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
SnO2–TiO2 electrospun nanofibers and their excitation dependent recombination.
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Affiliation(s)
| | - Sesha Vempati
- UNAM-National Nanotechnology Research Centre
- Bilkent University
- Ankara
- Turkey
| | - Yelda Ertas
- UNAM-National Nanotechnology Research Centre
- Bilkent University
- Ankara
- Turkey
- Institute of Materials Science & Nanotechnology
| | - Tamer Uyar
- UNAM-National Nanotechnology Research Centre
- Bilkent University
- Ankara
- Turkey
- Institute of Materials Science & Nanotechnology
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26
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Kumar SG, Rao KSRK. Polymorphic phase transition among the titania crystal structures using a solution-based approach: from precursor chemistry to nucleation process. NANOSCALE 2014; 6:11574-632. [PMID: 24969423 DOI: 10.1039/c4nr01657b] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Nanocrystalline titania are a robust candidate for various functional applications owing to its non-toxicity, cheap availability, ease of preparation and exceptional photochemical as well as thermal stability. The uniqueness in each lattice structure of titania leads to multifaceted physico-chemical and opto-electronic properties, which yield different functionalities and thus influence their performances in various green energy applications. The high temperature treatment for crystallizing titania triggers inevitable particle growth and the destruction of delicate nanostructural features. Thus, the preparation of crystalline titania with tunable phase/particle size/morphology at low to moderate temperatures using a solution-based approach has paved the way for further exciting areas of research. In this focused review, titania synthesis from hydrothermal/solvothermal method, conventional sol-gel method and sol-gel-assisted method via ultrasonication, photoillumination and ILs, thermolysis and microemulsion routes are discussed. These wet chemical methods have broader visibility, since multiple reaction parameters, such as precursor chemistry, surfactants, chelating agents, solvents, mineralizer, pH of the solution, aging time, reaction temperature/time, inorganic electrolytes, can be easily manipulated to tune the final physical structure. This review sheds light on the stabilization/phase transformation pathways of titania polymorphs like anatase, rutile, brookite and TiO2(B) under a variety of reaction conditions. The driving force for crystallization arising from complex species in solution coupled with pH of the solution and ion species facilitating the orientation of octahedral resulting in a crystalline phase are reviewed in detail. In addition to titanium halide/alkoxide, the nucleation of titania from other precursors like peroxo and layered titanates are also discussed. The non-aqueous route and ball milling-induced titania transformation is briefly outlined; moreover, the lacunae in understanding the concepts and future prospects in this exciting field are suggested.
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Affiliation(s)
- S Girish Kumar
- Department of Physics, Indian Institute of Science, Bangalore-560012, Karnataka, India.
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27
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Zeng L, Song W, Xie C. Fabrication of TiO2rod in tube nanostructure with enhanced photocatalytic activity: investigation of the effect of the states of the precursor on morphology. RSC Adv 2014. [DOI: 10.1039/c4ra06086e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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28
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Ye M, Zheng D, Wang M, Chen C, Liao W, Lin C, Lin Z. Hierarchically structured microspheres for high-efficiency rutile TiO(2)-based dye-sensitized solar cells. ACS APPLIED MATERIALS & INTERFACES 2014; 6:2893-901. [PMID: 24467178 DOI: 10.1021/am405442n] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Peachlike rutile TiO2 microsphere films were successfully produced on transparent conducting fluorine-doped tin oxide substrate via a facile, one-pot chemical bath route at low temperature (T = 80-85 °C) by introducing polyethylene glycol (PEG) as steric dispersant. The formation of TiO2 microspheres composed of nanoneedles was attributed to the acidic medium for the growth of 1D needle-shaped building blocks where the steric interaction of PEG reduced the aggregation of TiO2 nanoneedles and the Ostwald ripening process. Dye-sensitized solar cells (DSSCs) assembled by employing these complex rutile TiO2 microspheres as photoanodes exhibited a light-to-electricity conversion efficiency of 2.55%. It was further improved to a considerably high efficiency of 5.25% upon a series of post-treatments (i.e., calcination, TiCl4 treatment, and O2 plasma exposure) as a direct consequence of the well-crystallized TiO2 for fast electron transport, the enhanced capacity of dye loading, the effective light scattering, and trapping from microstructures.
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Affiliation(s)
- Meidan Ye
- State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen 361005, China
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29
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Jiang P, Ren D, He D, Fu W, Wang J, Gu M. An easily sedimentable and effective TiO2 photocatalyst for removal of dyes in water. Sep Purif Technol 2014. [DOI: 10.1016/j.seppur.2013.10.048] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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30
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Liu Y, Wang Z, Wang W, Huang W. Engineering highly active TiO2 photocatalysts via the surface-phase junction strategy employing a titanate nanotube precursor. J Catal 2014. [DOI: 10.1016/j.jcat.2013.03.024] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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31
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Li L, Salvador PA, Rohrer GS. Photocatalysts with internal electric fields. NANOSCALE 2014; 6:24-42. [PMID: 24084897 DOI: 10.1039/c3nr03998f] [Citation(s) in RCA: 264] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The photocatalytic activity of materials for water splitting is limited by the recombination of photogenerated electron-hole pairs as well as the back-reaction of intermediate species. This review concentrates on the use of electric fields within catalyst particles to mitigate the effects of recombination and back-reaction and to increase photochemical reactivity. Internal electric fields in photocatalysts can arise from ferroelectric phenomena, p-n junctions, polar surface terminations, and polymorph junctions. The manipulation of internal fields through the creation of charged interfaces in hierarchically structured materials is a promising strategy for the design of improved photocatalysts.
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Affiliation(s)
- Li Li
- Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.
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32
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Zhang DR, Liu HL, Han SY, Piao WX. Synthesis of Sc and V-doped TiO2 nanoparticles and photodegradation of rhodamine-B. J IND ENG CHEM 2013. [DOI: 10.1016/j.jiec.2013.02.029] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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33
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Kandiel TA, Robben L, Alkaim A, Bahnemann D. Brookite versus anatase TiO2 photocatalysts: phase transformations and photocatalytic activities. Photochem Photobiol Sci 2013; 12:602-9. [PMID: 22945758 DOI: 10.1039/c2pp25217a] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Titanium dioxide nanoparticles consisting of pure anatase, anatase-rich, brookite-rich, and pure brookite modifications were synthesized and characterized by X-ray diffraction, field emission-scanning electron microscopy and nitrogen adsorption. The phase transformations among the three modifications of TiO2 (anatase, brookite, and rutile) and the photocatalytic activities of these nanoparticles were investigated by heat treatment over the temperature range from 400 to 800 °C and by the photooxidation of methanol, respectively. Direct transformation of anatase and brookite to rutile was observed, while in the case of the anatase-brookite mixture, anatase transforms firstly to brookite and then to rutile. The photocatalytic activity measurements indicate that brookite nanoparticles exhibit higher photocatalytic activities than anatase, and a comparable activity to that of the anatase-rich nanoparticles. The phase transformations and photocatalytic results are discussed regarding their dependence on crystallite size, surface area, and phase composition.
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Affiliation(s)
- Tarek A Kandiel
- Institute of Technical Chemistry, Photocatalysis and Nanotechnology Research Unit, Leibniz Universität Hannover, Callinstr.3, 30167 Hannover, Germany
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Alammar T, Noei H, Wang Y, Mudring AV. Mild yet phase-selective preparation of TiO2 nanoparticles from ionic liquids--a critical study. NANOSCALE 2013; 5:8045-8055. [PMID: 23872945 DOI: 10.1039/c3nr00824j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The phase selective synthesis of nanocrystalline TiO2, titania, in ionic liquids (ILs) is explored. The influence not only of the IL but also of the Ti-precursor, pH, and temperature is investigated. Sonochemical synthesis, microwave synthesis and conventional heating are compared. In the case of Ti(O(i)Pr)4 (O(i)Pr = isopropyl) as the Ti-source the ILs [C4mim][Tf2N] (1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide), [C3mimOH][Tf2N] (1-(3-hydroxypropyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)amide), [C4Py][Tf2N] (butylpyridinium bis(trifluoromethanesulfonyl)amide), [N1888][Tf2N] (methyltrioctylammonium bis(trifluoromethanesulfonyl)amide), and [P66614][Tf2N] (tetradecyltrihexyl phosphonium bis(trifluoromethanesulfonyl)amide) led at ambient temperature to TiO2 in the form of anatase. The morphology of nano-anatase is controlled by the IL cation. Anatase nanospheres with a crystal size below 10 nm are obtained in [C3mimOH][Tf2N], [P66614][Tf2N] and [C4Py][Tf2N], whilst nanorods with a length and diameter of ∼10 to 20 and 5 nm are formed in [N1888][Tf2N] and spindle-shaped particles with an average length of 10-25 nm are formed in [C4mim][Tf2N]. Calcination at temperatures above 730 °C leads to rutile. When using TiCl4 as the Ti-precursor an anatase-rutile mixture forms under ambient conditions. Pure rutile can be obtained under ambient conditions in the presence of an appropriate volume of aqueous HCl. At moderate to high pH values pure anatase can be obtained even from TiCl4. The photocatalytic activity of the obtained TiO2 materials has been assessed by the photodegradation of an aqueous methyl orange solution under UV light. The results indicate that the photocatalytic activity of anatase-brookite mixtures obtained in [C4mim][Tf2N], [N1888][Tf2N] and [P66614][Tf2N] is higher than that of pure anatase which is formed in [C3mimOH][Tf2N] and [C4Py][Tf2N] and competitive with commercially available catalysts.
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Affiliation(s)
- Tarek Alammar
- Inorganic Chemistry III - Materials Synthesis and Characterization, Ruhr-Universität Bochum, D-44780 Bochum, Germany
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35
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Tzikalos N, Belessi V, Lambropoulou D. Photocatalytic degradation of Reactive Red 195 using anatase/brookite TiO2 mesoporous nanoparticles: optimization using response surface methodology (RSM) and kinetics studies. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:2305-20. [PMID: 22864757 DOI: 10.1007/s11356-012-1106-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 07/23/2012] [Indexed: 05/24/2023]
Abstract
In the present study, the photocatalytic degradation of Reactive Red 195 (RR195) from aqueous samples under UV-A irradiation by using anatase/brookite TiO2 (A/B TiO2) mesoporous nanoparticles has been investigated. Batch experiments were conducted to study the effects of the main parameters affecting the photocatalytic process. The effects and interactions of most influenced parameters, such as substrate concentration and catalyst load, were evaluated and optimized by using a central composite design model and a response surface methodology. The results indicated that the dye degradation efficiency in the experimental domain investigated was mainly affected by the tested variables, as well as their interaction effects. Analysis of variance showed a high coefficient of determination value (R(2) = 0.9947), thus ensuring a satisfactory adjustment of the first-order regression model (2FI model) with the experimental data. The obtained results also indicate that catalyst loading plays an important role in determining the removal efficiency of RR195 attributable to both photodegradation and adsorption process. Under optimal conditions (initial dye concentration (50 mg/L) and catalyst loading (2,000 mg/L), A/B TiO2 showed similar removal efficiency compared to that of commercial titania (Degussa P25). Also, at these conditions, complete degradation of RR195 can be achieved by both catalysts within 15 min under UV-A irradiation. The experiments demonstrated that dye removal on the prepared A/B TiO2 was facilitated by the synergistic effects between adsorption and photocatalysis. Photocatalytic mineralization of RR195 was monitored by total organic carbon. The recycling experiments confirmed the stability of the catalyst.
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Affiliation(s)
- Nikolaos Tzikalos
- Chemistry Department, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece
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Rabani J, Goldstein S. Mechanisms of Reactions Induced by Photocatalysis of Titanium Dioxide Nanoparticles. ENVIRONMENTAL PHOTOCHEMISTRY PART III 2013. [DOI: 10.1007/698_2013_248] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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39
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Rahimabady M, Mirshekarloo MS, Yao K, Lu L. Dielectric behaviors and high energy storage density of nanocomposites with core–shell BaTiO3@TiO2 in poly(vinylidene fluoride-hexafluoropropylene). Phys Chem Chem Phys 2013; 15:16242-8. [DOI: 10.1039/c3cp52267a] [Citation(s) in RCA: 141] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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40
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Shand M, Anderson JA. Aqueous phase photocatalytic nitrate destruction using titania based materials: routes to enhanced performance and prospects for visible light activation. Catal Sci Technol 2013. [DOI: 10.1039/c3cy20851f] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Lin L, Chai Y, Zhao B, Wei W, He D, He B, Tang Q. Photocatalytic oxidation for degradation of VOCs. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/ojic.2013.31003] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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42
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Katsumata KI, Ohno Y, Tomita K, Taniguchi T, Matsushita N, Okada K. Synthesis of amphiphilic brookite nanoparticles with high photocatalytic performance for wide range of application. ACS APPLIED MATERIALS & INTERFACES 2012; 4:4846-52. [PMID: 22860713 DOI: 10.1021/am301183t] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Brookite TiO(2) nanoparticles with amphiphilic properties were successfully synthesized with a water-soluble titanium glycolate complex precursor using an oleate-modified hydrothermal growth process. The ~20-40 nm TiO(2) nanoparticles were highly dispersible in both water and cyclohexane. The activity of the brookite nanoparticles for the degradation of acetaldehyde under UV irradiation was higher than that of Degussa P-25 TiO(2) powder. A spin-coated brookite film prepared on a polyimide substrate exhibited photoinduced hydrophilicity. Thus, these synthesized brookite nanoparticles could be applied as a photocatalytic coating solution.
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Affiliation(s)
- Ken-ichi Katsumata
- Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, Kanagawa 226-8503, Japan.
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43
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Xu D, Li J, Yu Y, Li J. From titanates to TiO2 nanostructures: Controllable synthesis, growth mechanism, and applications. Sci China Chem 2012. [DOI: 10.1007/s11426-012-4674-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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44
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The Inclusion of Organometallic Derivatives of Cyclotriphosphazenes Inside SiO2 Matrix and Their Conversion to Nanostructured Metal-Oxides and Phosphates. J Inorg Organomet Polym Mater 2012. [DOI: 10.1007/s10904-012-9692-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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45
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Jiao Y, Chen F, Zhao B, Yang H, Zhang J. Anatase grain loaded brookite nanoflower hybrid with superior photocatalytic activity for organic degradation. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.03.020] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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46
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Adsorption and photocatalysis of nanocrystalline TiO2 particles prepared by sol–gel method for methylene blue degradation. ADV POWDER TECHNOL 2012. [DOI: 10.1016/j.apt.2011.05.010] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Moonoosawmy KR, Katzke H, Es-Souni M, Dietze M, Es-Souni M. Mesoporous and macroporous brookite thin films having a large thermal stability range. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:6706-6713. [PMID: 22468776 DOI: 10.1021/la3006458] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A sol-gel chemistry approach is employed to generate mesoporous and macroporous brookite thin films using Ag ions as dopant species whose thermal stability is well above previously reported literature values for thin films. The Ag ions not only induce the formation of brookite but also participate in its enhanced thermal stability. Despite brookite being metastable in nature, which renders it a challenge to synthesize, it has been prescribed as a potential competitor to anatase. We have used a layer-by-layer approach to generate a mesoporous Ag-doped brookite structure at 500 °C with 95% composition by XRD. This tightly packed mesoporous structure can be described as striated grains of brookite protruding from the surface to form an interlocked network whose thermal stability spans up to 800 °C. The open structure of brookite makes it an apt host for the intercalant Ag species, whose inclusion within the brookite framework is improved by the presence of a stabilizing agent. Both the morphology of the surface and the presence of a stabilization agent for Ag contribute to enhancing its thermal stability. This is in contrast to the thermal stability of the macroporous brookite thin film, which was found to be lower (<700 °C) than that of the mesoporous brookite thin film. The reagents are deliberately chosen to produce a macroporous film in the absence of a stabilizing agent. Ag nodules are observed to be formed at 700 °C, which implies their limited intercalation into the brookite structure, thus rendering them relatively less stable. Moreover, the macroporous film being relatively more relaxed is more susceptible to phase transformation at a higher calcination temperature. Our results provide a platform that paves the way toward better control, thereby leading to a broader technological application of brookite.
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Affiliation(s)
- Kevin R Moonoosawmy
- Institute for Materials & Surface Technology (IMST), University of Applied Science , Grenzstrasse 3, 24149 Kiel, Germany
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Perego C, Wang YH, Durupthy O, Cassaignon S, Revel R, Jolivet JP. Nanocrystalline brookite with enhanced stability and photocatalytic activity: influence of lanthanum(III) doping. ACS APPLIED MATERIALS & INTERFACES 2012; 4:752-760. [PMID: 22201282 DOI: 10.1021/am201397n] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Metastable TiO(2) polymorphs are more promising materials than rutile for specific applications such as photocatalysis or catalysis support. This was clearly demonstrated for the anatase phase but still under consideration for brookite, which is difficult to obtain as pure phase. Moreover, the surface doping of anatase with lanthanum ions is known to both increase the thermal stability of the metastable phase and improve its photocatalytic activity. In this study, TiO(2) nanoparticles of almost only the brookite structure were prepared by a simple sol-gel procedure in aqueous solution. The nanoparticles were then doped with lanthanum(III) ions. The thermal stability of the nanoparticles was analyzed by X-ray diffraction and kinetic models were successfully applied to quantify phases evolutions. The presence of surface-sorbed lanthanum(III) ions increased the phase stability of at least 200 °C and this temperature shift was attributed to the selective phase stabilization of metastable TiO(2) polymorphs. Moreover, the combination of the surface doping ions and the thermal treatment induces the vanishing of the secondary anatase phase, and the photocatalytic tests on the doped brookite nanoparticles demonstrated that the doping increased photocatalytic activity and that the extent depended on the duration of the sintering treatment.
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Affiliation(s)
- Céline Perego
- IFP Energies Nouvelles, Rond point de l'Échangeur de Solaize, BP 3, 69360 Solaize, France
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Li J, Yang H, Li Q, Xu D. Enlarging the application of potassium titanate nanowires as titanium source for preparation of TiO2 nanostructures with tunable phases. CrystEngComm 2012. [DOI: 10.1039/c2ce06672f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Díaz C, Valenzuela M, Bravo D, Dickinson C, O’Dwyer C. Solid-state synthesis of embedded single-crystal metal oxide and phosphate nanoparticles and in situ crystallization. J Colloid Interface Sci 2011; 362:21-32. [DOI: 10.1016/j.jcis.2011.05.066] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Revised: 05/18/2011] [Accepted: 05/20/2011] [Indexed: 10/18/2022]
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