The interaction of Mn2+ with porous silica xerogels and the hydration-dehydration processes in the xerogels

Noureddine Abidi; B. Deroide; J. V. Zanchetta

The interaction of Mn2+ with porous silica xerogels and the hydration-dehydration processes in the xerogels

Noureddine Abidi, B. Deroide, J. V. Zanchetta

Fiber and Biopolymer Research Inst

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

Abstract

The electron paramagnetic resonance (EPR) spectra of Mn2+ have been used to investigate the structure of silica xerogels prepared from tetraethylorthosilicate. The measurements were made at similar to 9.8 GHz. The probe was introduced during preparation of a sol and the EPR spectra of subsequent xerogels were measured following calcination at various temperatures (120 degrees C less than or equal to T-T less than or equal to 1000 degrees C). The spectra after adsorption of NH3 or H2O were measured. Adsorption of NH3 showed a quasi non-reversible effect whereas there was a modification of the spectra which depended on the water vapor pressure. Adsorption and desorption of water were ascribed to surface effects and simulation of the spectra showed that two different sites are involved. An EPR method of determination of pore diameter is proposed. (C) 1997 Elsevier Science B.V.

Original language	English
Pages (from-to)	59-69
Journal	Journal of Non-Crystalline Solids
State	Published - 1997

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title = "The interaction of Mn2+ with porous silica xerogels and the hydration-dehydration processes in the xerogels",

abstract = "The electron paramagnetic resonance (EPR) spectra of Mn2+ have been used to investigate the structure of silica xerogels prepared from tetraethylorthosilicate. The measurements were made at similar to 9.8 GHz. The probe was introduced during preparation of a sol and the EPR spectra of subsequent xerogels were measured following calcination at various temperatures (120 degrees C less than or equal to T-T less than or equal to 1000 degrees C). The spectra after adsorption of NH3 or H2O were measured. Adsorption of NH3 showed a quasi non-reversible effect whereas there was a modification of the spectra which depended on the water vapor pressure. Adsorption and desorption of water were ascribed to surface effects and simulation of the spectra showed that two different sites are involved. An EPR method of determination of pore diameter is proposed. (C) 1997 Elsevier Science B.V.",

author = "Noureddine Abidi and B. Deroide and Zanchetta, {J. V.}",

year = "1997",

language = "English",

pages = "59--69",

journal = "Journal of Non-Crystalline Solids",

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TY - JOUR

T1 - The interaction of Mn2+ with porous silica xerogels and the hydration-dehydration processes in the xerogels

AU - Abidi, Noureddine

AU - Deroide, B.

AU - Zanchetta, J. V.

PY - 1997

Y1 - 1997

N2 - The electron paramagnetic resonance (EPR) spectra of Mn2+ have been used to investigate the structure of silica xerogels prepared from tetraethylorthosilicate. The measurements were made at similar to 9.8 GHz. The probe was introduced during preparation of a sol and the EPR spectra of subsequent xerogels were measured following calcination at various temperatures (120 degrees C less than or equal to T-T less than or equal to 1000 degrees C). The spectra after adsorption of NH3 or H2O were measured. Adsorption of NH3 showed a quasi non-reversible effect whereas there was a modification of the spectra which depended on the water vapor pressure. Adsorption and desorption of water were ascribed to surface effects and simulation of the spectra showed that two different sites are involved. An EPR method of determination of pore diameter is proposed. (C) 1997 Elsevier Science B.V.

AB - The electron paramagnetic resonance (EPR) spectra of Mn2+ have been used to investigate the structure of silica xerogels prepared from tetraethylorthosilicate. The measurements were made at similar to 9.8 GHz. The probe was introduced during preparation of a sol and the EPR spectra of subsequent xerogels were measured following calcination at various temperatures (120 degrees C less than or equal to T-T less than or equal to 1000 degrees C). The spectra after adsorption of NH3 or H2O were measured. Adsorption of NH3 showed a quasi non-reversible effect whereas there was a modification of the spectra which depended on the water vapor pressure. Adsorption and desorption of water were ascribed to surface effects and simulation of the spectra showed that two different sites are involved. An EPR method of determination of pore diameter is proposed. (C) 1997 Elsevier Science B.V.

M3 - Article

SP - 59

EP - 69

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

ER -