Soft X-ray spectromicroscopy on solid-stabilized emulsions

U. Neuhäusler*, S. Abend, C. Jacobsen, G. Lagaly

*Corresponding author for this work

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

Oil-water emulsions stabilized by solids have been imaged with sub-100 nm spatial resolution and analyzed spectroscopically using a scanning transmission X-ray microscope. The emulsions are stabilized by particle heterocoagulate cages surrounding the oil droplets. These cages form due to the interaction of negatively charged clay mineral particles (sodium montmorillonite, Wyoming) and positively charged particles of calcium/aluminum layered double hydroxide (LDH). The emulsions were studied at atmospheric pressure, without any pretreatment using carbon K and calcium L X-ray absorption edges. Oil- and calcium-rich LDH were separately mapped, and the clay mineral dispersions were also imaged. Applying X-ray absorption-edge contrast, oil could be distinguished from water in the emulsion near the carbon K absorption edge (284 eV, 4.4 nm). Spectromicroscopy near the calcium L absorption edge (346 eV, 3.6 nm) allowed the structural details of heterocoagulate formation to be revealed.

Original languageEnglish (US)
Pages (from-to)719-726
Number of pages8
JournalColloid and Polymer Science
Volume277
Issue number8
DOIs
StatePublished - Jan 1 1999

Keywords

  • Layered double hydroxide
  • Montmorillonite
  • Pickering emulsions
  • Soft X-ray spectromicroscopy
  • Solid-stabilized emulsions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Soft X-ray spectromicroscopy on solid-stabilized emulsions'. Together they form a unique fingerprint.

Cite this