Simple fabrication of snowman-like colloids

Neetu Chaturvedi, Bala Krishna Juluri, Qingzhen Hao, Tony Jun Huang, Darrell Velegol

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Anisotropic colloidal particles consisting of different compositions and geometry are useful for various applications. These include optical biosensing, antireflective coatings and electronic displays. In this work we demonstrate a simple and cost-effective method for fabricating anisotropic colloidal particles bearing a snowman-like shape. This is achieved by first settling the positively-charged polystyrene latex (PSL) colloids and negatively-charged silica colloids in deionized water onto a glass substrate, forming heterodoublets. The temperature is then raised above the glass transition temperature of the polymer. As a result, the silica particle spontaneously rises to the top of the PSL particle forming a snowman like structure. We have extended this method to different sizes and shown that the structure of the hybrid particles can be tuned by adjusting the size ratio between the silica and the PSL colloids. The surface coverage of the PSL, and hence of the snowman particles, on the glass substrate can also be varied by changing the ionic strength of the solution during the adhesion of PSL to the glass.

Original languageEnglish (US)
Pages (from-to)28-33
Number of pages6
JournalJournal of Colloid And Interface Science
Volume371
Issue number1
DOIs
StatePublished - Apr 1 2012

Fingerprint

Colloids
Latexes
Polystyrenes
Particles (particulate matter)
Fabrication
Silicon Dioxide
Silica
Glass
Bearings (structural)
Deionized water
Substrates
Ionic strength
Polymers
Adhesion
Display devices
styrofoam
Coatings
Geometry
Chemical analysis
Costs

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Colloid and Surface Chemistry

Cite this

Chaturvedi, Neetu ; Juluri, Bala Krishna ; Hao, Qingzhen ; Huang, Tony Jun ; Velegol, Darrell. / Simple fabrication of snowman-like colloids. In: Journal of Colloid And Interface Science. 2012 ; Vol. 371, No. 1. pp. 28-33.
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Simple fabrication of snowman-like colloids. / Chaturvedi, Neetu; Juluri, Bala Krishna; Hao, Qingzhen; Huang, Tony Jun; Velegol, Darrell.

In: Journal of Colloid And Interface Science, Vol. 371, No. 1, 01.04.2012, p. 28-33.

Research output: Contribution to journalArticle

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