One-step chemical vapor deposition synthesis of magnetic CNT-hercynite (FeAl2O4) hybrids with good aqueous colloidal stability

A multiwall carbon nanotube (MWCNT)/hercynite (FeAl2O 4) 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 attach...

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Detalles Bibliográficos
Publicado: 2013
Materias:
Aqueous suspensions
Chemical vapor depositions (CVD)
Colloidal Stability
Controlled oxidations
Dispersibilities
Hybrid nanomaterials
Hydrophilic polymers
Magnetic behavior
Catalysts
Functional groups
Hybrid materials
Multiwalled carbon nanotubes (MWCN)
Nanostructured materials
Saturation magnetization
Superparamagnetism
Suspensions (fluids)
Vapors
Chemical vapor deposition
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00086223_v61_n_p515_Morales
http://hdl.handle.net/20.500.12110/paper_00086223_v61_n_p515_Morales
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00086223_v61_n_p515_Morales
record_format dspace
spelling paper:paper_00086223_v61_n_p515_Morales2023-06-08T14:33:12Z One-step chemical vapor deposition synthesis of magnetic CNT-hercynite (FeAl2O4) hybrids with good aqueous colloidal stability Aqueous suspensions Chemical vapor depositions (CVD) Colloidal Stability Controlled oxidations Dispersibilities Hybrid nanomaterials Hydrophilic polymers Magnetic behavior Catalysts Functional groups Hybrid materials Multiwalled carbon nanotubes (MWCN) Nanostructured materials Saturation magnetization Superparamagnetism Suspensions (fluids) Vapors Chemical vapor deposition A multiwall carbon nanotube (MWCNT)/hercynite (FeAl2O 4) 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. © 2013 Elsevier Ltd. All rights reserved. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00086223_v61_n_p515_Morales http://hdl.handle.net/20.500.12110/paper_00086223_v61_n_p515_Morales
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Aqueous suspensions
Chemical vapor depositions (CVD)
Colloidal Stability
Controlled oxidations
Dispersibilities
Hybrid nanomaterials
Hydrophilic polymers
Magnetic behavior
Catalysts
Functional groups
Hybrid materials
Multiwalled carbon nanotubes (MWCN)
Nanostructured materials
Saturation magnetization
Superparamagnetism
Suspensions (fluids)
Vapors
Chemical vapor deposition
spellingShingle Aqueous suspensions
Chemical vapor depositions (CVD)
Colloidal Stability
Controlled oxidations
Dispersibilities
Hybrid nanomaterials
Hydrophilic polymers
Magnetic behavior
Catalysts
Functional groups
Hybrid materials
Multiwalled carbon nanotubes (MWCN)
Nanostructured materials
Saturation magnetization
Superparamagnetism
Suspensions (fluids)
Vapors
Chemical vapor deposition
One-step chemical vapor deposition synthesis of magnetic CNT-hercynite (FeAl2O4) hybrids with good aqueous colloidal stability
topic_facet Aqueous suspensions
Chemical vapor depositions (CVD)
Colloidal Stability
Controlled oxidations
Dispersibilities
Hybrid nanomaterials
Hydrophilic polymers
Magnetic behavior
Catalysts
Functional groups
Hybrid materials
Multiwalled carbon nanotubes (MWCN)
Nanostructured materials
Saturation magnetization
Superparamagnetism
Suspensions (fluids)
Vapors
Chemical vapor deposition
description A multiwall carbon nanotube (MWCNT)/hercynite (FeAl2O 4) 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. © 2013 Elsevier Ltd. All rights reserved.
title One-step chemical vapor deposition synthesis of magnetic CNT-hercynite (FeAl2O4) hybrids with good aqueous colloidal stability
title_short One-step chemical vapor deposition synthesis of magnetic CNT-hercynite (FeAl2O4) hybrids with good aqueous colloidal stability
title_full One-step chemical vapor deposition synthesis of magnetic CNT-hercynite (FeAl2O4) hybrids with good aqueous colloidal stability
title_fullStr One-step chemical vapor deposition synthesis of magnetic CNT-hercynite (FeAl2O4) hybrids with good aqueous colloidal stability
title_full_unstemmed One-step chemical vapor deposition synthesis of magnetic CNT-hercynite (FeAl2O4) hybrids with good aqueous colloidal stability
title_sort one-step chemical vapor deposition synthesis of magnetic cnt-hercynite (feal2o4) hybrids with good aqueous colloidal stability
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00086223_v61_n_p515_Morales
http://hdl.handle.net/20.500.12110/paper_00086223_v61_n_p515_Morales
_version_ 1768543353895387136

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