One-step chemical vapor deposition synthesis of magnetic CNT–hercynite (FeAl2O4) hybrids with good aqueous colloidal stability
| Autor: | Victoria Bekeris, C. Chiliotte, Gerardo Hector Rubiolo, Roberto Candal, Silvia Goyanes, Noé J. Morales |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Hercynite Ciencias Físicas Nanoparticle Física de Los Materiales Condensados Nanotechnology 02 engineering and technology Carbon nanotube Chemical vapor deposition engineering.material 010402 general chemistry 01 natural sciences 7. Clean energy law.invention Nanomaterials Ciencias Naturales y Exactas law General Materials Science Aqueous solution Material hibrido General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Nanotubos de carbon Chemical engineering 13. Climate action Hercynita engineering 0210 nano-technology Hybrid material Superparamagnetism |
| Zdroj: | Carbon. 61:515-524 |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2013.04.106 |
| Popis: | A multiwall carbon nanotube (MWCNT)/hercynite (FeAl2O4) hybrid nanomaterial was synthesized by one-step chemical vapor deposition (CVD) using acetylene as precursor and FeOx-AlOOH xerogel as catalyst. The hybrid material was composing by hercynite nanoparticles (diameter 10?50 nm) intimately attached to the walls of the MWCNTs. The diameter of the MWCNTs was related to particle size of the catalyst. The hybrid nanomaterial exhibited a characteristic magnetic behavior that can be considered as a combination of superparamagnetism and ferromagnetism, with a saturation magnetization of 5.7 emu/g at an applied field of 18 kOe and a coercivity of 520 Oe. The hybrid displayed a relatively low pHZPC (approx. 3.2) and formed very stable aqueous suspensions at pH 5.5. Controlled oxidation of the hybrid generated oxidized functional groups, as -OH and-COOH, and promoted the transformation of hercynite to hematite. Due to the high dispersibility of the hybrid in water, it presents an interesting potential as nanofiller for hydrophilic polymers Fil: Morales Mendoza, Noe Javier. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Industrias; Argentina; Fil: Goyanes, Silvia Nair. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires; Argentina; Fil: Chiliotte, Claudio Ezequiel. Universidad de Buenos Aires. Facultad de Cs.exactas y Naturales. Departamento de Fisica. Laboratorio de Fisica de Bajas Temperaturas; Argentina; Fil: Bekeris, Victoria Isabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires; Argentina; Fil: Candal, Roberto Jorge. Consejo Nacional de Investigaciones Científico Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Químico Física de los Materiales Medioambiente y Energía; Argentina; Fil: Rubiolo, Gerardo Hector. Comision Nacional de Energia Atomica. Gerencia D/area de Energia Nuclear. Unidad de Actividad de Ingenieria Nuclear |
| Databáze: | OpenAIRE |
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