Self-assembled particle monolayers on polyelectrolyte multilayers: Particle size effects on formation, structure, and optical properties

Jin Soo Ahn, Paula T. Hammond, Michael F. Rubner, Ilsoon Lee

Research output: Contribution to journalArticle

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Abstract

Monolayers of charged polystyrene latex particles ranging in size from 100 nm to 10 μm were deposited on oppositely charged polyelectrolyte multilayers (PEMs) by electrostatic interactions and capillary forces. Ultrathin PEMs (∼30 nm) formed on a glass slide provided an excellent underlying adhesive layer. As the sample surface was being dried, strong capillary forces between particles resulted in a unique pattern of particle monolayers (i.e., two-dimensional (2-D) particle aggregates). The resulting topographical structure of the coatings strongly influenced the transmission of visible light through the slides. The total and specular transmittances showed three different characteristics as a function of particle size: (1) anti-reflection, when the particle diameter (Dparticle) is around a quarter of the wavelength of the incident visible light (Dparticle ∼ λ vis/4), (2) diffraction, when the Dparticle is equivalent to the wavelength of the incident beam (Dparticle ∼ λvis), and (3) diffusive scattering when the D particle is bigger than the wavelength of the incident beam (D particle ∼ λvis). Additionally, for the first time, the monolayer coverage and fractal-dimension analyses have been reported over a wide range of particle sizes. Functional groups present in these coatings allow further customization via chemical modification.

LanguageEnglish (US)
Pages45-53
Number of pages9
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume259
Issue number1-3
DOIs
StatePublished - May 31 2005

Profile

Polyelectrolytes
Monolayers
Multilayers
Optical properties
Particle size
optical properties
Wavelength
Coatings
Chemical modification
Fractal dimension
Coulomb interactions
Latexes
Functional groups
Particles (particulate matter)
Polystyrenes
Adhesives
Diffraction
Scattering
Glass
chutes

Keywords

  • Anti-reflection
  • Diffraction
  • Diffusive scattering
  • Optical properties
  • Particle monolayer
  • Particle size
  • Polyelectrolyte multilayers

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Self-assembled particle monolayers on polyelectrolyte multilayers : Particle size effects on formation, structure, and optical properties. / Ahn, Jin Soo; Hammond, Paula T.; Rubner, Michael F.; Lee, Ilsoon.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 259, No. 1-3, 31.05.2005, p. 45-53.

Research output: Contribution to journalArticle

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