In-Situ Synchrotron Radiation Study of Formation and Growth of Crystalline CexZr1-xO2 Nanoparticles Synthesized in Supercritical Water
(2010) In Chemistry of Materials 22(5). p.1814-1820- Abstract
- In situ synchrotron powder X-ray diffraction (PXRD) measurements have been conducted to follow the nucleation and growth of crystalline CexZr1-xO2 nanoparticles synthesized in supercritical water with a full substitution variation (x = 0, 0.2, 0.5, 0.8, and 1.0). Direction-dependent growth curves are determined and described using reaction kinetic models. A disctinct change in growth kinetics is observed with increasing cerium content. For x = 0.8 and 1.0 (high cerium content), the growth in initially limited by the surface reaction kinetics, however, at a size of similar to 6 nm, the growth changes and becomes limited by the diffusion of monomers toward the surface. For x = 0 and 0.2, the opposite behavior is observed with the growth... (More)
- In situ synchrotron powder X-ray diffraction (PXRD) measurements have been conducted to follow the nucleation and growth of crystalline CexZr1-xO2 nanoparticles synthesized in supercritical water with a full substitution variation (x = 0, 0.2, 0.5, 0.8, and 1.0). Direction-dependent growth curves are determined and described using reaction kinetic models. A disctinct change in growth kinetics is observed with increasing cerium content. For x = 0.8 and 1.0 (high cerium content), the growth in initially limited by the surface reaction kinetics, however, at a size of similar to 6 nm, the growth changes and becomes limited by the diffusion of monomers toward the surface. For x = 0 and 0.2, the opposite behavior is observed with the growth initially being limited by diffusion (up to similar to 3.5 nm) and later by the surface reaction kinetics. Thus, although a continuous solid solution can be obtained for the ceria-zirconia system, the growth of ceria and zirconia nanoparticles is fundamentally different under supercritical flow reactor. The resulting samples were analyzed using PXRD, small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). The nanoparticles with x = 0, 0.2, and 0.5 have very low polydispersities. The sizes range from 4 nm to 7 nm, and the particles exhibit a reversibly pH-dependent agglomeration. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1568287
- author
- Tyrsted, Christoffer ; Becker, Jacob ; Hald, Peter ; Bremholm, Martin ; Pedersen, Jan Skov ; Chevallier, Jacques ; Cerenius, Yngve LU ; Iversen, Steen B. and Iversen, Bo B.
- organization
- publishing date
- 2010
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Chemistry of Materials
- volume
- 22
- issue
- 5
- pages
- 1814 - 1820
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000274929000028
- scopus:77949343598
- ISSN
- 0897-4756
- DOI
- 10.1021/cm903316s
- language
- English
- LU publication?
- yes
- id
- a5446d58-a901-49bb-a616-e50bac1a0e42 (old id 1568287)
- date added to LUP
- 2016-04-01 10:19:02
- date last changed
- 2022-04-04 08:49:58
@article{a5446d58-a901-49bb-a616-e50bac1a0e42,
abstract = {{In situ synchrotron powder X-ray diffraction (PXRD) measurements have been conducted to follow the nucleation and growth of crystalline CexZr1-xO2 nanoparticles synthesized in supercritical water with a full substitution variation (x = 0, 0.2, 0.5, 0.8, and 1.0). Direction-dependent growth curves are determined and described using reaction kinetic models. A disctinct change in growth kinetics is observed with increasing cerium content. For x = 0.8 and 1.0 (high cerium content), the growth in initially limited by the surface reaction kinetics, however, at a size of similar to 6 nm, the growth changes and becomes limited by the diffusion of monomers toward the surface. For x = 0 and 0.2, the opposite behavior is observed with the growth initially being limited by diffusion (up to similar to 3.5 nm) and later by the surface reaction kinetics. Thus, although a continuous solid solution can be obtained for the ceria-zirconia system, the growth of ceria and zirconia nanoparticles is fundamentally different under supercritical flow reactor. The resulting samples were analyzed using PXRD, small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). The nanoparticles with x = 0, 0.2, and 0.5 have very low polydispersities. The sizes range from 4 nm to 7 nm, and the particles exhibit a reversibly pH-dependent agglomeration.}},
author = {{Tyrsted, Christoffer and Becker, Jacob and Hald, Peter and Bremholm, Martin and Pedersen, Jan Skov and Chevallier, Jacques and Cerenius, Yngve and Iversen, Steen B. and Iversen, Bo B.}},
issn = {{0897-4756}},
language = {{eng}},
number = {{5}},
pages = {{1814--1820}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Chemistry of Materials}},
title = {{In-Situ Synchrotron Radiation Study of Formation and Growth of Crystalline CexZr1-xO2 Nanoparticles Synthesized in Supercritical Water}},
url = {{http://dx.doi.org/10.1021/cm903316s}},
doi = {{10.1021/cm903316s}},
volume = {{22}},
year = {{2010}},
}