Effects of mechanical pretreatment of precursor sols and gels on the formation of NiO/SiO2 composites with a controlled microstructure

Katsuhiko Takeuchi, Tetsuhiko Isobe, Mamoru Senna

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The effects of ball-milling a sol, prepared from Ni-Si bidentate alkoxides, on the segregation of NiO from SiO2 during subsequent heating are studied for the purpose of fabricating composites in which the nanosized microstructure is controlled. After dissolving a nylon substrate on which gel films were deposited, the films were heated to 500°C in air. Transmission electron micrographs of substrateless gel films showed that the agglomeration of NiO particles, formed in the films, decreased by ball-milling a sol. A similar phenomenon was also observed on ball-milling gel powders. The infrared absorption bands due to Si-O asymmetric stretching vibration became broader by ball-milling. This broadening also occurred when NiO segregated from SiO2 by heating a non-milled gel powder above 700°C. It is suggested that ball-milling produced a more homogeneously distributed nucleation of NiO particles through the breakage of bonds between O2- and Ni2+ incorporated into SiO2 networks.

Original languageEnglish
Pages (from-to)58-62
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume194
Issue number1-2
Publication statusPublished - 1996 Jan

Fingerprint

Ball milling
Polymethyl Methacrylate
Sols
pretreatment
balls
Gels
gels
microstructure
Microstructure
composite materials
Composite materials
Powders
Heating
heating
Nylon (trademark)
Nylons
alkoxides
Infrared absorption
agglomeration
Particles (particulate matter)

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

Effects of mechanical pretreatment of precursor sols and gels on the formation of NiO/SiO2 composites with a controlled microstructure. / Takeuchi, Katsuhiko; Isobe, Tetsuhiko; Senna, Mamoru.

In: Journal of Non-Crystalline Solids, Vol. 194, No. 1-2, 01.1996, p. 58-62.

Research output: Contribution to journalArticle

@article{1a03138c380b479aa82de87a60dc3cc4,
title = "Effects of mechanical pretreatment of precursor sols and gels on the formation of NiO/SiO2 composites with a controlled microstructure",
abstract = "The effects of ball-milling a sol, prepared from Ni-Si bidentate alkoxides, on the segregation of NiO from SiO2 during subsequent heating are studied for the purpose of fabricating composites in which the nanosized microstructure is controlled. After dissolving a nylon substrate on which gel films were deposited, the films were heated to 500°C in air. Transmission electron micrographs of substrateless gel films showed that the agglomeration of NiO particles, formed in the films, decreased by ball-milling a sol. A similar phenomenon was also observed on ball-milling gel powders. The infrared absorption bands due to Si-O asymmetric stretching vibration became broader by ball-milling. This broadening also occurred when NiO segregated from SiO2 by heating a non-milled gel powder above 700°C. It is suggested that ball-milling produced a more homogeneously distributed nucleation of NiO particles through the breakage of bonds between O2- and Ni2+ incorporated into SiO2 networks.",
author = "Katsuhiko Takeuchi and Tetsuhiko Isobe and Mamoru Senna",
year = "1996",
month = "1",
language = "English",
volume = "194",
pages = "58--62",
journal = "Journal of Non-Crystalline Solids",
issn = "0022-3093",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Effects of mechanical pretreatment of precursor sols and gels on the formation of NiO/SiO2 composites with a controlled microstructure

AU - Takeuchi, Katsuhiko

AU - Isobe, Tetsuhiko

AU - Senna, Mamoru

PY - 1996/1

Y1 - 1996/1

N2 - The effects of ball-milling a sol, prepared from Ni-Si bidentate alkoxides, on the segregation of NiO from SiO2 during subsequent heating are studied for the purpose of fabricating composites in which the nanosized microstructure is controlled. After dissolving a nylon substrate on which gel films were deposited, the films were heated to 500°C in air. Transmission electron micrographs of substrateless gel films showed that the agglomeration of NiO particles, formed in the films, decreased by ball-milling a sol. A similar phenomenon was also observed on ball-milling gel powders. The infrared absorption bands due to Si-O asymmetric stretching vibration became broader by ball-milling. This broadening also occurred when NiO segregated from SiO2 by heating a non-milled gel powder above 700°C. It is suggested that ball-milling produced a more homogeneously distributed nucleation of NiO particles through the breakage of bonds between O2- and Ni2+ incorporated into SiO2 networks.

AB - The effects of ball-milling a sol, prepared from Ni-Si bidentate alkoxides, on the segregation of NiO from SiO2 during subsequent heating are studied for the purpose of fabricating composites in which the nanosized microstructure is controlled. After dissolving a nylon substrate on which gel films were deposited, the films were heated to 500°C in air. Transmission electron micrographs of substrateless gel films showed that the agglomeration of NiO particles, formed in the films, decreased by ball-milling a sol. A similar phenomenon was also observed on ball-milling gel powders. The infrared absorption bands due to Si-O asymmetric stretching vibration became broader by ball-milling. This broadening also occurred when NiO segregated from SiO2 by heating a non-milled gel powder above 700°C. It is suggested that ball-milling produced a more homogeneously distributed nucleation of NiO particles through the breakage of bonds between O2- and Ni2+ incorporated into SiO2 networks.

UR - http://www.scopus.com/inward/record.url?scp=0006504143&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0006504143&partnerID=8YFLogxK

M3 - Article

VL - 194

SP - 58

EP - 62

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

SN - 0022-3093

IS - 1-2

ER -