Preparation of fracture-free, uniform, crystallized titania hollow nanospheres by spray pyrolyzing core-shell seeds

Jung Sun Lim, Sang Yup Lee, Seung Bin Park

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Crystalline hollow nanospheres that are potentially applicable for optical, catalytic, and electronic devices have been generally synthesized by wet chemical approaches with multiple steps. Colloidal aerosol pyrolysis is a valuable approach producing crystallized hollow nanospheres with mass-production, minimum manufacturing steps, and less chemical usage than conventional wet chemical methods. However, conventional gas phase pyrolysis strategy has unsolved critical issues when synthesizing uniform shell-type nanoparticles including uncontrollable fracturing by sharp thermal shocks and material shrinking during crystallization. In this manuscript, the shell fracture in the gas phase continuous process is eliminated utilizing two stage pyrolysis which removes significant stresses from thermal treatment and gas emission. Advantages of solution chemistry and gas phase continuous process are combined by exploiting colloidal spray pyrolysis with two stages, therefore enabling continuous synthesis of uniform hollow spheres accompanying with organic core burning and nanoshell crystallization without fracture.

Original languageEnglish
Pages (from-to)1023-1027
Number of pages5
JournalAdvanced Powder Technology
Volume24
Issue number6
DOIs
Publication statusPublished - 2013 Nov 1

Fingerprint

Nanospheres
Seed
Pyrolysis
Titanium
Gases
Crystallization
Nanoshells
Spray pyrolysis
Thermal shock
Aerosols
Gas emissions
Heat treatment
Nanoparticles
Crystalline materials
titanium dioxide

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Mechanics of Materials

Cite this

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abstract = "Crystalline hollow nanospheres that are potentially applicable for optical, catalytic, and electronic devices have been generally synthesized by wet chemical approaches with multiple steps. Colloidal aerosol pyrolysis is a valuable approach producing crystallized hollow nanospheres with mass-production, minimum manufacturing steps, and less chemical usage than conventional wet chemical methods. However, conventional gas phase pyrolysis strategy has unsolved critical issues when synthesizing uniform shell-type nanoparticles including uncontrollable fracturing by sharp thermal shocks and material shrinking during crystallization. In this manuscript, the shell fracture in the gas phase continuous process is eliminated utilizing two stage pyrolysis which removes significant stresses from thermal treatment and gas emission. Advantages of solution chemistry and gas phase continuous process are combined by exploiting colloidal spray pyrolysis with two stages, therefore enabling continuous synthesis of uniform hollow spheres accompanying with organic core burning and nanoshell crystallization without fracture.",
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Preparation of fracture-free, uniform, crystallized titania hollow nanospheres by spray pyrolyzing core-shell seeds. / Lim, Jung Sun; Lee, Sang Yup; Park, Seung Bin.

In: Advanced Powder Technology, Vol. 24, No. 6, 01.11.2013, p. 1023-1027.

Research output: Contribution to journalArticle

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