Preparation and properties of optically transparent aqueous dispersions of monodisperse fluorinated colloids

Gijsberta H. Koenderink, Stefano Sacanna, Chellapah Pathmamanoharan, Mircea Raşa, Albert P. Philipse

Research output: Contribution to journalArticle

Abstract

We report the emulsion polymerization and seeded growth of negatively charged, monodisperse fluorinated latex spheres in water with radii in the range 50-700 nm. Due to their low refractive index (n p = 1.3660), the spheres can be index matched in aqueous media, without any complications due to (optical) polydispersity or specific solvent adsorption. Such index-matched dispersions of fluorinated latex allow study of the structure and dynamics of strongly interacting charged colloids in water, using light scattering or microscopy. Moreover, we prepared core-shell particles with fluorinated latex shells and optically anisotropic PFA (tetrafluoroethylene copolymerized with perfluoroalkylvinyl ether) cores. We demonstrate with depolarized light scattering that these cores allow for measurement of rotational self-diffusion. The fluorinated latex dispersions are characterized extensively using light scattering, electron microscopy, atomic force microscopy, and electrophoresis. Optical contrast variation is used to determine the particle refractive index and to demonstrate that the particles are optically homogeneous.

Original languageEnglish (US)
Pages (from-to)6086-6093
Number of pages8
JournalLangmuir
Volume17
Issue number20
DOIs
StatePublished - Oct 2 2001

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Latex
Colloids
latex
Latexes
Dispersions
colloids
Light scattering
preparation
light scattering
Refractive index
refractivity
Water
Emulsion polymerization
Polydispersity
electrophoresis
Electrophoresis
Ether
water
Electron microscopy
Particles (particulate matter)

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Preparation and properties of optically transparent aqueous dispersions of monodisperse fluorinated colloids. / Koenderink, Gijsberta H.; Sacanna, Stefano; Pathmamanoharan, Chellapah; Raşa, Mircea; Philipse, Albert P.

In: Langmuir, Vol. 17, No. 20, 02.10.2001, p. 6086-6093.

Research output: Contribution to journalArticle

Koenderink, Gijsberta H. ; Sacanna, Stefano ; Pathmamanoharan, Chellapah ; Raşa, Mircea ; Philipse, Albert P. / Preparation and properties of optically transparent aqueous dispersions of monodisperse fluorinated colloids. In: Langmuir. 2001 ; Vol. 17, No. 20. pp. 6086-6093.
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