Elemental surface enrichment in flame synthesis: A mechanism associated with particle melting-solidification

Bing Guo, Hoon Yim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Elemental surface enrichment is important for functionalities of flame-synthesized particle materials, but its mechanism is poorly understood. In this paper, a mechanism associated with particle melting-solidification is proposed based on an experimental study. Y2O3:Eu particles were generated by flame assisted spray pyrolysis (FASP), using H 2/O2 flames or H2/air flames. The particles were analyzed by transmission electron microscopy (TEM), X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), and X-ray photoelectron spectroscopy (XPS). H2/O2 flames resulted in particles with Eu surface enrichment, i.e. the surface Eu concentration was several times higher than the overall Eu concentration; there was no elemental surface enrichment in particles from H2/air flames. The Eu surface enrichment in H2/O2 flames was attributed to elemental partitioning during solidification of molten Y2O3:Eu particles; in H2/air flames the particles did not melt and hence there was no elemental surface enrichment. The findings of this study suggest that elemental surface enrichment may be a common phenomenon for binary metal oxide particles that experience melting-solidification. Such particles should be examined for elemental surface enrichment, both for understanding their functionality and for their potential biological effects.

Original languageEnglish
Pages (from-to)1875-1882
Number of pages8
JournalProceedings of the Combustion Institute
Volume33
Issue number2
DOIs
Publication statusPublished - 2011
Externally publishedYes

Fingerprint

Flame synthesis
solidification
Solidification
flames
Melting
melting
synthesis
Air
air
Inductively coupled plasma mass spectrometry
Spray pyrolysis
biological effects
Oxides
inductively coupled plasma mass spectrometry
Molten materials
X ray photoelectron spectroscopy
Metals
pyrolysis
sprayers
metal oxides

Keywords

  • Elemental surface enrichment
  • Flame synthesis
  • Functional particles
  • Melting-solidification
  • YO:Eu particles

ASJC Scopus subject areas

  • Mechanical Engineering
  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Elemental surface enrichment in flame synthesis : A mechanism associated with particle melting-solidification. / Guo, Bing; Yim, Hoon.

In: Proceedings of the Combustion Institute, Vol. 33, No. 2, 2011, p. 1875-1882.

Research output: Contribution to journalArticle

@article{d010d1a8eee240e9959c902e9d6e9126,
title = "Elemental surface enrichment in flame synthesis: A mechanism associated with particle melting-solidification",
abstract = "Elemental surface enrichment is important for functionalities of flame-synthesized particle materials, but its mechanism is poorly understood. In this paper, a mechanism associated with particle melting-solidification is proposed based on an experimental study. Y2O3:Eu particles were generated by flame assisted spray pyrolysis (FASP), using H 2/O2 flames or H2/air flames. The particles were analyzed by transmission electron microscopy (TEM), X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), and X-ray photoelectron spectroscopy (XPS). H2/O2 flames resulted in particles with Eu surface enrichment, i.e. the surface Eu concentration was several times higher than the overall Eu concentration; there was no elemental surface enrichment in particles from H2/air flames. The Eu surface enrichment in H2/O2 flames was attributed to elemental partitioning during solidification of molten Y2O3:Eu particles; in H2/air flames the particles did not melt and hence there was no elemental surface enrichment. The findings of this study suggest that elemental surface enrichment may be a common phenomenon for binary metal oxide particles that experience melting-solidification. Such particles should be examined for elemental surface enrichment, both for understanding their functionality and for their potential biological effects.",
keywords = "Elemental surface enrichment, Flame synthesis, Functional particles, Melting-solidification, YO:Eu particles",
author = "Bing Guo and Hoon Yim",
year = "2011",
doi = "10.1016/j.proci.2010.05.031",
language = "English",
volume = "33",
pages = "1875--1882",
journal = "Proceedings of the Combustion Institute",
issn = "1540-7489",
publisher = "Elsevier Limited",
number = "2",

}

TY - JOUR

T1 - Elemental surface enrichment in flame synthesis

T2 - A mechanism associated with particle melting-solidification

AU - Guo, Bing

AU - Yim, Hoon

PY - 2011

Y1 - 2011

N2 - Elemental surface enrichment is important for functionalities of flame-synthesized particle materials, but its mechanism is poorly understood. In this paper, a mechanism associated with particle melting-solidification is proposed based on an experimental study. Y2O3:Eu particles were generated by flame assisted spray pyrolysis (FASP), using H 2/O2 flames or H2/air flames. The particles were analyzed by transmission electron microscopy (TEM), X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), and X-ray photoelectron spectroscopy (XPS). H2/O2 flames resulted in particles with Eu surface enrichment, i.e. the surface Eu concentration was several times higher than the overall Eu concentration; there was no elemental surface enrichment in particles from H2/air flames. The Eu surface enrichment in H2/O2 flames was attributed to elemental partitioning during solidification of molten Y2O3:Eu particles; in H2/air flames the particles did not melt and hence there was no elemental surface enrichment. The findings of this study suggest that elemental surface enrichment may be a common phenomenon for binary metal oxide particles that experience melting-solidification. Such particles should be examined for elemental surface enrichment, both for understanding their functionality and for their potential biological effects.

AB - Elemental surface enrichment is important for functionalities of flame-synthesized particle materials, but its mechanism is poorly understood. In this paper, a mechanism associated with particle melting-solidification is proposed based on an experimental study. Y2O3:Eu particles were generated by flame assisted spray pyrolysis (FASP), using H 2/O2 flames or H2/air flames. The particles were analyzed by transmission electron microscopy (TEM), X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), and X-ray photoelectron spectroscopy (XPS). H2/O2 flames resulted in particles with Eu surface enrichment, i.e. the surface Eu concentration was several times higher than the overall Eu concentration; there was no elemental surface enrichment in particles from H2/air flames. The Eu surface enrichment in H2/O2 flames was attributed to elemental partitioning during solidification of molten Y2O3:Eu particles; in H2/air flames the particles did not melt and hence there was no elemental surface enrichment. The findings of this study suggest that elemental surface enrichment may be a common phenomenon for binary metal oxide particles that experience melting-solidification. Such particles should be examined for elemental surface enrichment, both for understanding their functionality and for their potential biological effects.

KW - Elemental surface enrichment

KW - Flame synthesis

KW - Functional particles

KW - Melting-solidification

KW - YO:Eu particles

UR - http://www.scopus.com/inward/record.url?scp=79251616456&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79251616456&partnerID=8YFLogxK

U2 - 10.1016/j.proci.2010.05.031

DO - 10.1016/j.proci.2010.05.031

M3 - Article

AN - SCOPUS:79251616456

VL - 33

SP - 1875

EP - 1882

JO - Proceedings of the Combustion Institute

JF - Proceedings of the Combustion Institute

SN - 1540-7489

IS - 2

ER -