Biogenic SiO2 in colloidal dispersions via ball milling and ultrasonication

Research output: Contribution to journalArticle

Researchers

Research units

  • Universidade Federal do Paraná
  • Embrapa Forestry
  • North Carolina State University

Abstract

Biogenic silica from Equisetum arvense was dispersed in aqueous media by using ball milling, high-energy planetary ball milling and ultrasonication. Zeta potential (ζ), dynamic light scattering, and transmission electron microscopy revealed the electrostatic charge and morphological characteristics of the particles, which formed stable colloidal dispersions. Ball milling and ultrasonication yielded particles of 10 nm in size that clustered into larger structures. Extended milling time was effective in reducing the particle size by ball milling and ultrasonication but not by high-energy planetary ball milling. The colloidal stability of the dispersions was maximized under alkaline conditions (ζ > - 30 mV and smallest cluster size of 100-200 nm).

Details

Original languageEnglish
Pages (from-to)58-64
Number of pages7
JournalPowder Technology
Volume301
Publication statusPublished - 1 Nov 2016
MoE publication typeA1 Journal article-refereed

    Research areas

  • Biogenic nanosilica, Colloidal dispersions, Equisetum arvense, Surface charge

ID: 4808415