Sintering process of amorphous SiO2 nanoparticles investigated by AFM, IR and Raman techniques

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Abstract

We report an experimental investigation on the effects of thermal treatments at different temperatures (room—1270 K) and for different duration (0–75 h) on amorphous silica nanoparticles (fumed silica) in powder tabletform. Three types of fumed silica are considered, comprising nearly spherical particles of 40 nm, 14 nmand 7 nmmean diameter. The experimental techniques used here are Raman and infrared absorption (IR) spectroscopytogether with atomic force microscopy (AFM). Raman and IR spectra indicate that the structure of nanometersilica particles is significantly differentwith respect to that of a bulk silica glass. In particular, themain differencesregard the positions of the IR band peaked at about 2260 cm−1, the Raman R-band peaked at about 440 cm−1 andthe intensity of the D1 and the D2 Raman lines, related to the populations of 4- and 3-membered rings,respectively. Our data also indicate that, under thermal treatments, the structure of fumed silica samples issignificantly changed, gradually relaxing towards that pertaining to ordinary bulk silica. These changes areinterpreted here on the basis of the morphological information provided by the AFM measurements andassuming a two-shell structure for the fumed silica primary particles.
Lingua originaleEnglish
pagine (da-a)1866-1870
Numero di pagine5
RivistaDefault journal
Volume357
Stato di pubblicazionePublished - 2011

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Infrared absorption
Silicon Dioxide
infrared absorption
Atomic force microscopy
sintering
Sintering
Silica
atomic force microscopy
Nanoparticles
silicon dioxide
nanoparticles
Absorption spectra
Heat treatment
Shells (structures)
absorption spectra
silica glass
Fused silica
Powders
infrared spectra
Raman spectra

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

Cita questo

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title = "Sintering process of amorphous SiO2 nanoparticles investigated by AFM, IR and Raman techniques",
abstract = "We report an experimental investigation on the effects of thermal treatments at different temperatures (room—1270 K) and for different duration (0–75 h) on amorphous silica nanoparticles (fumed silica) in powder tabletform. Three types of fumed silica are considered, comprising nearly spherical particles of 40 nm, 14 nmand 7 nmmean diameter. The experimental techniques used here are Raman and infrared absorption (IR) spectroscopytogether with atomic force microscopy (AFM). Raman and IR spectra indicate that the structure of nanometersilica particles is significantly differentwith respect to that of a bulk silica glass. In particular, themain differencesregard the positions of the IR band peaked at about 2260 cm−1, the Raman R-band peaked at about 440 cm−1 andthe intensity of the D1 and the D2 Raman lines, related to the populations of 4- and 3-membered rings,respectively. Our data also indicate that, under thermal treatments, the structure of fumed silica samples issignificantly changed, gradually relaxing towards that pertaining to ordinary bulk silica. These changes areinterpreted here on the basis of the morphological information provided by the AFM measurements andassuming a two-shell structure for the fumed silica primary particles.",
keywords = "Atomic force microscopy, Fumed silica, Infrared absorption, Raman, Sintering",
author = "Gianpiero Buscarino and Gelardi, {Franco Mario} and Gianfranco Vaccaro",
year = "2011",
language = "English",
volume = "357",
pages = "1866--1870",
journal = "Default journal",

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TY - JOUR

T1 - Sintering process of amorphous SiO2 nanoparticles investigated by AFM, IR and Raman techniques

AU - Buscarino, Gianpiero

AU - Gelardi, Franco Mario

AU - Vaccaro, Gianfranco

PY - 2011

Y1 - 2011

N2 - We report an experimental investigation on the effects of thermal treatments at different temperatures (room—1270 K) and for different duration (0–75 h) on amorphous silica nanoparticles (fumed silica) in powder tabletform. Three types of fumed silica are considered, comprising nearly spherical particles of 40 nm, 14 nmand 7 nmmean diameter. The experimental techniques used here are Raman and infrared absorption (IR) spectroscopytogether with atomic force microscopy (AFM). Raman and IR spectra indicate that the structure of nanometersilica particles is significantly differentwith respect to that of a bulk silica glass. In particular, themain differencesregard the positions of the IR band peaked at about 2260 cm−1, the Raman R-band peaked at about 440 cm−1 andthe intensity of the D1 and the D2 Raman lines, related to the populations of 4- and 3-membered rings,respectively. Our data also indicate that, under thermal treatments, the structure of fumed silica samples issignificantly changed, gradually relaxing towards that pertaining to ordinary bulk silica. These changes areinterpreted here on the basis of the morphological information provided by the AFM measurements andassuming a two-shell structure for the fumed silica primary particles.

AB - We report an experimental investigation on the effects of thermal treatments at different temperatures (room—1270 K) and for different duration (0–75 h) on amorphous silica nanoparticles (fumed silica) in powder tabletform. Three types of fumed silica are considered, comprising nearly spherical particles of 40 nm, 14 nmand 7 nmmean diameter. The experimental techniques used here are Raman and infrared absorption (IR) spectroscopytogether with atomic force microscopy (AFM). Raman and IR spectra indicate that the structure of nanometersilica particles is significantly differentwith respect to that of a bulk silica glass. In particular, themain differencesregard the positions of the IR band peaked at about 2260 cm−1, the Raman R-band peaked at about 440 cm−1 andthe intensity of the D1 and the D2 Raman lines, related to the populations of 4- and 3-membered rings,respectively. Our data also indicate that, under thermal treatments, the structure of fumed silica samples issignificantly changed, gradually relaxing towards that pertaining to ordinary bulk silica. These changes areinterpreted here on the basis of the morphological information provided by the AFM measurements andassuming a two-shell structure for the fumed silica primary particles.

KW - Atomic force microscopy

KW - Fumed silica

KW - Infrared absorption

KW - Raman

KW - Sintering

UR - http://hdl.handle.net/10447/53750

M3 - Article

VL - 357

SP - 1866

EP - 1870

JO - Default journal

JF - Default journal

ER -