Preparation of Mn, Ni, Co ferrite highly porous silica nanocomposite aerogels by an urea-assisted sol-gel procedure

Danilo Loche; Maria F. Casula; Andrea Falqui; Sergio Marras; Anna Corrias

doi:10.1166/jnn.2010.1907

Preparation of Mn, Ni, Co ferrite highly porous silica nanocomposite aerogels by an urea-assisted sol-gel procedure

Danilo Loche^*, Maria F. Casula, Andrea Falqui, Sergio Marras, Anna Corrias

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

The preparation of highly porous MnFe ₂O ₄-SiO ₂ and NiFe ₂O ₄-SiO ₂ nanocomposite aerogels with high purity and homogeneity was successfully achieved by a sol-gel procedure involving urea- assisted co-gelation of the precursor phases firstly applied for the synthesis of CoFe ₂O ₄-SiO ₂. This method allows fast gelation, giving rise to aerogels with 97% porosity. The structural, morphological and textural characterization as a function of thermal treatments was carried out by a multitechnique approach confirming that, as in the case of CoFe ₂O ₄-SiO ₂, the formation of single nanocrystals of manganese ferrite and nickel ferrite with spinel structure occurs after heating at 750 °C and is complete at 900 °C when the high porosity typical of aerogels is still retained. Thermogravimetric analysis (TG), differential thermal analysis (DTA), N ₂-physisorption at 77 K, powder X-ray diffraction (XRD), and transmission electron microscopy (TEM) indicate that the compositional homogeneity, crystallite size, thermal stability, and porosity are controlled by the sol-gel parameters of the preparation.

Original language	English (US)
Pages (from-to)	1008-1016
Number of pages	9
Journal	Journal of nanoscience and nanotechnology
Volume	10
Issue number	2
DOIs	https://doi.org/10.1166/jnn.2010.1907
State	Published - Feb 2010
Externally published	Yes

Keywords

Aerogel
Ferrite
Nanocomposite
Nanoparticles

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Bioengineering
Biomedical Engineering
General Materials Science

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title = "Preparation of Mn, Ni, Co ferrite highly porous silica nanocomposite aerogels by an urea-assisted sol-gel procedure",

abstract = "The preparation of highly porous MnFe 2O 4-SiO 2 and NiFe 2O 4-SiO 2 nanocomposite aerogels with high purity and homogeneity was successfully achieved by a sol-gel procedure involving urea- assisted co-gelation of the precursor phases firstly applied for the synthesis of CoFe 2O 4-SiO 2. This method allows fast gelation, giving rise to aerogels with 97% porosity. The structural, morphological and textural characterization as a function of thermal treatments was carried out by a multitechnique approach confirming that, as in the case of CoFe 2O 4-SiO 2, the formation of single nanocrystals of manganese ferrite and nickel ferrite with spinel structure occurs after heating at 750 °C and is complete at 900 °C when the high porosity typical of aerogels is still retained. Thermogravimetric analysis (TG), differential thermal analysis (DTA), N 2-physisorption at 77 K, powder X-ray diffraction (XRD), and transmission electron microscopy (TEM) indicate that the compositional homogeneity, crystallite size, thermal stability, and porosity are controlled by the sol-gel parameters of the preparation.",

keywords = "Aerogel, Ferrite, Nanocomposite, Nanoparticles",

author = "Danilo Loche and Casula, {Maria F.} and Andrea Falqui and Sergio Marras and Anna Corrias",

year = "2010",

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doi = "10.1166/jnn.2010.1907",

language = "English (US)",

volume = "10",

pages = "1008--1016",

journal = "Journal of nanoscience and nanotechnology",

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T1 - Preparation of Mn, Ni, Co ferrite highly porous silica nanocomposite aerogels by an urea-assisted sol-gel procedure

AU - Loche, Danilo

AU - Casula, Maria F.

AU - Falqui, Andrea

AU - Marras, Sergio

AU - Corrias, Anna

PY - 2010/2

Y1 - 2010/2

N2 - The preparation of highly porous MnFe 2O 4-SiO 2 and NiFe 2O 4-SiO 2 nanocomposite aerogels with high purity and homogeneity was successfully achieved by a sol-gel procedure involving urea- assisted co-gelation of the precursor phases firstly applied for the synthesis of CoFe 2O 4-SiO 2. This method allows fast gelation, giving rise to aerogels with 97% porosity. The structural, morphological and textural characterization as a function of thermal treatments was carried out by a multitechnique approach confirming that, as in the case of CoFe 2O 4-SiO 2, the formation of single nanocrystals of manganese ferrite and nickel ferrite with spinel structure occurs after heating at 750 °C and is complete at 900 °C when the high porosity typical of aerogels is still retained. Thermogravimetric analysis (TG), differential thermal analysis (DTA), N 2-physisorption at 77 K, powder X-ray diffraction (XRD), and transmission electron microscopy (TEM) indicate that the compositional homogeneity, crystallite size, thermal stability, and porosity are controlled by the sol-gel parameters of the preparation.

AB - The preparation of highly porous MnFe 2O 4-SiO 2 and NiFe 2O 4-SiO 2 nanocomposite aerogels with high purity and homogeneity was successfully achieved by a sol-gel procedure involving urea- assisted co-gelation of the precursor phases firstly applied for the synthesis of CoFe 2O 4-SiO 2. This method allows fast gelation, giving rise to aerogels with 97% porosity. The structural, morphological and textural characterization as a function of thermal treatments was carried out by a multitechnique approach confirming that, as in the case of CoFe 2O 4-SiO 2, the formation of single nanocrystals of manganese ferrite and nickel ferrite with spinel structure occurs after heating at 750 °C and is complete at 900 °C when the high porosity typical of aerogels is still retained. Thermogravimetric analysis (TG), differential thermal analysis (DTA), N 2-physisorption at 77 K, powder X-ray diffraction (XRD), and transmission electron microscopy (TEM) indicate that the compositional homogeneity, crystallite size, thermal stability, and porosity are controlled by the sol-gel parameters of the preparation.

KW - Aerogel

KW - Ferrite

KW - Nanocomposite

KW - Nanoparticles

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DO - 10.1166/jnn.2010.1907

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ER -

Preparation of Mn, Ni, Co ferrite highly porous silica nanocomposite aerogels by an urea-assisted sol-gel procedure

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Keywords

ASJC Scopus subject areas

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