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Influence of ammonia concentration on the formation of hollow silica microspheres via polystyrene beads templating

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Published/Copyright: May 14, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 102 Issue 12

Abstract

The influence of ammonia concentration on the formation of hollow silica microspheres via polystyrene beads templating was investigated. Hollow silica microspheres could only be templated in water – ethanol – ammonia – tetraethyl orthosilicate media with low concentrations of ammonia. It is shown that in template-free media, the aggregation of silica particles decreases with ammonia concentrations. Thus, the aggregation degree of formed silica particles may imply whether a silica forming media is suitable for preparing hollow silica microspheres via polystyrene beads templating. The increase in ammonia promotes spontaneous nucleation and condensation of silica oligomers to form silica particles. The repulsive forces between the particles as well as those between them and templates are relatively large, hindering the assembly of silica primary particles on the templates to form silica shells.

Keywords: Assembly; Hollow silica microsphere; Polystyrene bead; Repulsive force
* Correspondence address Prof. Dr. Shiquan Liu, School of Materials Science and Engineering, University of Jinan, West Campus, No. 106, Jiwei Road, Jinan 250022, P. R. China, Tel.: + 86 531 87 97 44 53, Fax: + 86 531 87 97 44 53, E-mail:

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Received: 2010-7-26
Accepted: 2011-9-26
Published Online: 2013-05-14
Published in Print: 2011-12-01

© 2011, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110608
Keywords for this article
Assembly; Hollow silica microsphere; Polystyrene bead; Repulsive force

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Influence of annealing on the mechanical anisotropy of hot pack rolled Ti-6Al-4V sheets
  5. Recovery and recrystallisation processes in plastically deformed WE43 alloy
  6. An investigation into the microstructure and weldability of a tantalum-containing cast cobalt-based superalloy
  7. Synchrotron measurement of the 3D shape of X-ray reflections from the γ/γ′-microstructure of nickel-base superalloys
  8. Semisolid microstructure of AM60B magnesium alloy refined by SiC particles
  9. The viscosity of eutectic Pd – Si alloys – a case study
  10. A simple hydrothermal route to bimodal mesoporous nanorod γ-alumina with high thermal stability
  11. Synthesis of nano-crystalline Zn – CoO pigment by the chemical combustion method: Effect of fuel to oxidizer ratio on structure, microstructure and color properties
  12. Nanobiotechnology approach to fabricate polycaprolactone nanofibers containing solid titanium nanoparticles as future implant materials
  13. Influence of ammonia concentration on the formation of hollow silica microspheres via polystyrene beads templating
  14. Synthesis and characterization of mesoporous silica using new gemini surfactants as templates in neutral pH conditions
  15. The use of ground silica sand, ground granulated blast furnace slag and ground basaltic pumice in cementitious adhesives for tiles
  16. Structural, optical and luminescence studies of ZnSe nanowires
  17. Study of single-walled carbon nanotube dielectrophoresis
  18. Time-dependent corrosion resistance of zinc phosphate coating on AZ31B magnesium alloy in sodium chloride solution
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