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Effect of Potassium-incorporated Titanium Dioxide in an in vitro Granuloma System for Mycobacterium tuberculosis. BIONANOSCIENCE 2022. [DOI: 10.1007/s12668-022-01029-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Santos AJ, Escanciano M, Suárez-Llorens A, Pilar Yeste M, Morales FM. A Novel Route for the Easy Production of Thermochromic VO 2 Nanoparticles. Chemistry 2021; 27:16662-16669. [PMID: 34661929 PMCID: PMC9297899 DOI: 10.1002/chem.202102566] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Indexed: 11/09/2022]
Abstract
In this work, a simple, fast and dry method for the fabrication of a thermochromic product with a high load of VO2(M1) consisting of the controlled heat treatment of pure vanadium nanoparticles in air is presented. After a complete design of experiments, it is concluded that the most direct way to attain the maximum transformation of V into VO2(M1) consists of one cycle with a fast heating ramp of 42 °C s−1, followed by keeping 700 °C for 530–600 seconds, and a subsequent cooling at 0.05 °C s−1. Careful examination of these results lead to a second optimum, even more suitable for industrial production (quicker and less energy‐intensive because of its lower temperatures and shorter times), consisting of subjecting V to two consecutive cycles of temperatures and times (625 °C for 5 minutes) with similar preheating (42 °C s−1) but a much faster postcooling (∼ 8 °C s−1). These green reactions only use the power for heating a tube open to atmosphere and a vanadium precursor; without assistance of reactive gases or catalysts, and no special vacuum or pressure requirements. The best products present similar thermochromic properties but higher thermal stability than commercial VO2 particles. These methods can be combined with VO2 doping.
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Affiliation(s)
- Antonio J Santos
- IMEYMAT: Institute of Research on Electron Microscopy and Materials, University of Cadiz, Puerto Real, Cádiz, Spain.,Department of Materials Science, Metallurgical Engineering and Inorganic Chemistry, Faculty of Sciences, University of Cádiz, Puerto Real, Cádiz, Spain
| | - Marta Escanciano
- IMEYMAT: Institute of Research on Electron Microscopy and Materials, University of Cadiz, Puerto Real, Cádiz, Spain.,Department of Materials Science, Metallurgical Engineering and Inorganic Chemistry, Faculty of Sciences, University of Cádiz, Puerto Real, Cádiz, Spain
| | - Alfonso Suárez-Llorens
- Department of Statistics and Operative Investigation, Faculty of Sciences, University of Cádiz, Puerto Real, Cádiz, Spain.,INDESS: Institute of Research on Social and Sustainable Development, University of Cádiz, Jerez, Cádiz, Spain
| | - M Pilar Yeste
- IMEYMAT: Institute of Research on Electron Microscopy and Materials, University of Cadiz, Puerto Real, Cádiz, Spain.,Department of Materials Science, Metallurgical Engineering and Inorganic Chemistry, Faculty of Sciences, University of Cádiz, Puerto Real, Cádiz, Spain
| | - Francisco M Morales
- IMEYMAT: Institute of Research on Electron Microscopy and Materials, University of Cadiz, Puerto Real, Cádiz, Spain.,Department of Materials Science, Metallurgical Engineering and Inorganic Chemistry, Faculty of Sciences, University of Cádiz, Puerto Real, Cádiz, Spain
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