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 language | English (US) |
|---|---|
| Pages (from-to) | 28-33 |
| Number of pages | 6 |
| Journal | Journal of Colloid And Interface Science |
| Volume | 371 |
| Issue number | 1 |
| DOIs | |
| State | Published - Apr 1 2012 |
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All Science Journal Classification (ASJC) codes
- Surfaces, Coatings and Films
- Electronic, Optical and Magnetic Materials
- Biomaterials
- Colloid and Surface Chemistry
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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 journal › Article
TY - JOUR
T1 - Simple fabrication of snowman-like colloids
AU - Chaturvedi, Neetu
AU - Juluri, Bala Krishna
AU - Hao, Qingzhen
AU - Huang, Tony Jun
AU - Velegol, Darrell
PY - 2012/4/1
Y1 - 2012/4/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84857060508&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84857060508&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2012.01.003
DO - 10.1016/j.jcis.2012.01.003
M3 - Article
VL - 371
SP - 28
EP - 33
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
IS - 1
ER -