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Title: Sol-gel and ultrafine particle formation via dielectric tuning of inorganic salt-alcohol-water solutions

Abstract

In this work, the formation of monodispersed hydrous zirconia microsphere particles (particularly nanosized) and gels was achieved in solutions of zirconyl chloride dissolved in alcohol-water mixed solvents. A lower dielectric constant of mixed solvent corresponds to a lower solubility of inorganic solute and, thus, a shorter induction period for nucleation as well as higher solid particle growth kinetics. The sol-gel processes in the mixed solvent system can be adjusted using the processing parameters, including the initial inorganic salt concentration (C), alcohol/aqueous medium volume ratio of the mixed solution (RH), incubation temperature (T), incubation time (t), concentration of hydroxypropyl cellulose (HPC), and ammonia neutralization. Monodispersed submicron and nanoscale (<100 nm) zirconia microspheres/powders were successfully synthesized under conditions of high RH (5) and using HPC (molecular weight of 100,000, 2.0 x 10{sup {minus}3} g/cm{sup 3}) and ammonia neutralization. Initial salt concentration affects the particle size significantly. Gel materials were obtained under conditions of low RH (1.0). Microstructure and transparency of gels changed significantly from low (0.05 M) to high (0.2 M) concentration of the metal salt. The authors have also demonstrated that monodispersed particle production can be achieved not only at low temperatures (<100 C) but also at room temperature using anmore » inorganic salt precursor.« less

Authors:
; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
20017490
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Journal Article
Journal Name:
Journal of Colloid and Interface Science
Additional Journal Information:
Journal Volume: 222; Journal Issue: 1; Other Information: PBD: 1 Feb 2000; Journal ID: ISSN 0021-9797
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SOL-GEL PROCESS; ZIRCONIUM OXIDES; PARTICLES; GELS; MIXED SOLVENTS; ALCOHOLS; WATER; CERAMICS; PRECURSOR

Citation Formats

Hu, M Z.C., Payzant, E A, and Byers, C H. Sol-gel and ultrafine particle formation via dielectric tuning of inorganic salt-alcohol-water solutions. United States: N. p., 2000. Web. doi:10.1006/jcis.1999.6610.
Hu, M Z.C., Payzant, E A, & Byers, C H. Sol-gel and ultrafine particle formation via dielectric tuning of inorganic salt-alcohol-water solutions. United States. https://doi.org/10.1006/jcis.1999.6610
Hu, M Z.C., Payzant, E A, and Byers, C H. Tue . "Sol-gel and ultrafine particle formation via dielectric tuning of inorganic salt-alcohol-water solutions". United States. https://doi.org/10.1006/jcis.1999.6610.
@article{osti_20017490,
title = {Sol-gel and ultrafine particle formation via dielectric tuning of inorganic salt-alcohol-water solutions},
author = {Hu, M Z.C. and Payzant, E A and Byers, C H},
abstractNote = {In this work, the formation of monodispersed hydrous zirconia microsphere particles (particularly nanosized) and gels was achieved in solutions of zirconyl chloride dissolved in alcohol-water mixed solvents. A lower dielectric constant of mixed solvent corresponds to a lower solubility of inorganic solute and, thus, a shorter induction period for nucleation as well as higher solid particle growth kinetics. The sol-gel processes in the mixed solvent system can be adjusted using the processing parameters, including the initial inorganic salt concentration (C), alcohol/aqueous medium volume ratio of the mixed solution (RH), incubation temperature (T), incubation time (t), concentration of hydroxypropyl cellulose (HPC), and ammonia neutralization. Monodispersed submicron and nanoscale (<100 nm) zirconia microspheres/powders were successfully synthesized under conditions of high RH (5) and using HPC (molecular weight of 100,000, 2.0 x 10{sup {minus}3} g/cm{sup 3}) and ammonia neutralization. Initial salt concentration affects the particle size significantly. Gel materials were obtained under conditions of low RH (1.0). Microstructure and transparency of gels changed significantly from low (0.05 M) to high (0.2 M) concentration of the metal salt. The authors have also demonstrated that monodispersed particle production can be achieved not only at low temperatures (<100 C) but also at room temperature using an inorganic salt precursor.},
doi = {10.1006/jcis.1999.6610},
url = {https://www.osti.gov/biblio/20017490}, journal = {Journal of Colloid and Interface Science},
issn = {0021-9797},
number = 1,
volume = 222,
place = {United States},
year = {2000},
month = {2}
}