Abstract
We report effects of patterned surface structures with the modulation of hydrophobicity in the fabrication of two-dimensional (2D) self-aligned colloidal crystals. Colloidal silica particles have been synthesized by the Stöber process (near monodispersion of 280 nm and 350 nm in diameter). When a drop of the silica suspension with a given volume and concentration (typically 5 μL and 0.5 wt % of the silica particles) is placed upon the substrate, it spreads and forms a concave shape in geometric confinement. In the drop of suspension, horizontal convective flow occurs due to the concave shape and capillary forces. Silica particles are packed together hexagonally resulting in a self-aligned silica monolayer inside the patterned lines. The surfaces with chemical and/or physical patterned lines (∼3 and 5 μm in width and spacing) were fabricated on silicon substrate with silicon dioxide by photolithography combined with the modified chemically through SAMs (self-assembled monolayers) of OTS (octadecyltrichlorosilane) using a microcontact printing technique to create alternating hydrophilic/hydrophobic line patterns. Highly ordered silica 2D patterns were observed in the hydrophilic regions, while no silica particles were found in OTS-covered line patterns. Self-aligned silica particle patterns were also observed in a quite large area (at least several hundreds of micrometers) through the line patterns of the surfaces with superhydrophilic modification. This method can serve as a position selective self-alignment aggregation and can be applicable to photonics and micro/nanofabrication.
| Original language | English |
|---|---|
| Pages (from-to) | 103-111 |
| Number of pages | 9 |
| Journal | Ceramic Transactions |
| Volume | 159 |
| Publication status | Published - 2005 Aug 22 |
| Event | 106th Annual Meeting of the American Ceramic Society - Indianapolis, IN, United States Duration: 2004 Apr 18 → 2004 Apr 21 |
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All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry
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Self-alignment of SiO2 colloidal particles on physically and/or chemically patterned surfaces. / Bae, Changdeuck; Shin, Hyunjung; Moon, Jooho.
In: Ceramic Transactions, Vol. 159, 22.08.2005, p. 103-111.Research output: Contribution to journal › Conference article
TY - JOUR
T1 - Self-alignment of SiO2 colloidal particles on physically and/or chemically patterned surfaces
AU - Bae, Changdeuck
AU - Shin, Hyunjung
AU - Moon, Jooho
PY - 2005/8/22
Y1 - 2005/8/22
N2 - We report effects of patterned surface structures with the modulation of hydrophobicity in the fabrication of two-dimensional (2D) self-aligned colloidal crystals. Colloidal silica particles have been synthesized by the Stöber process (near monodispersion of 280 nm and 350 nm in diameter). When a drop of the silica suspension with a given volume and concentration (typically 5 μL and 0.5 wt % of the silica particles) is placed upon the substrate, it spreads and forms a concave shape in geometric confinement. In the drop of suspension, horizontal convective flow occurs due to the concave shape and capillary forces. Silica particles are packed together hexagonally resulting in a self-aligned silica monolayer inside the patterned lines. The surfaces with chemical and/or physical patterned lines (∼3 and 5 μm in width and spacing) were fabricated on silicon substrate with silicon dioxide by photolithography combined with the modified chemically through SAMs (self-assembled monolayers) of OTS (octadecyltrichlorosilane) using a microcontact printing technique to create alternating hydrophilic/hydrophobic line patterns. Highly ordered silica 2D patterns were observed in the hydrophilic regions, while no silica particles were found in OTS-covered line patterns. Self-aligned silica particle patterns were also observed in a quite large area (at least several hundreds of micrometers) through the line patterns of the surfaces with superhydrophilic modification. This method can serve as a position selective self-alignment aggregation and can be applicable to photonics and micro/nanofabrication.
AB - We report effects of patterned surface structures with the modulation of hydrophobicity in the fabrication of two-dimensional (2D) self-aligned colloidal crystals. Colloidal silica particles have been synthesized by the Stöber process (near monodispersion of 280 nm and 350 nm in diameter). When a drop of the silica suspension with a given volume and concentration (typically 5 μL and 0.5 wt % of the silica particles) is placed upon the substrate, it spreads and forms a concave shape in geometric confinement. In the drop of suspension, horizontal convective flow occurs due to the concave shape and capillary forces. Silica particles are packed together hexagonally resulting in a self-aligned silica monolayer inside the patterned lines. The surfaces with chemical and/or physical patterned lines (∼3 and 5 μm in width and spacing) were fabricated on silicon substrate with silicon dioxide by photolithography combined with the modified chemically through SAMs (self-assembled monolayers) of OTS (octadecyltrichlorosilane) using a microcontact printing technique to create alternating hydrophilic/hydrophobic line patterns. Highly ordered silica 2D patterns were observed in the hydrophilic regions, while no silica particles were found in OTS-covered line patterns. Self-aligned silica particle patterns were also observed in a quite large area (at least several hundreds of micrometers) through the line patterns of the surfaces with superhydrophilic modification. This method can serve as a position selective self-alignment aggregation and can be applicable to photonics and micro/nanofabrication.
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M3 - Conference article
AN - SCOPUS:23744442355
VL - 159
SP - 103
EP - 111
JO - Ceramic Transactions
JF - Ceramic Transactions
SN - 1042-1122
ER -