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Ordered Micro/Nanostructures with Geometric Gradient: From Integrated Wettability "Library" to Anisotropic Wetting
Peihong Xue1, Jingjie Nan1, Tieqiang Wang2
1State Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|November 26, 2016
Summary
Researchers created ordered microsphere arrays with geometric gradients (OMAGG) using colloidal lithography and inclined reactive ion etching (RIE). This method fabricates silicon cone arrays with tunable wettability for applications in tissue engineering and microfluidics.
Area of Science:
- Materials Science
- Surface Science
- Nanotechnology
Background:
- Geometric gradients in micro/nanostructures influence wetting properties.
- Ordered microsphere arrays offer a platform for controlled surface modifications.
Purpose of the Study:
- To fabricate ordered microsphere arrays with geometric gradients (OMAGG) using colloidal lithography and inclined reactive ion etching (RIE).
- To develop a method for creating silicon cone arrays with geometric gradients (SCAGG) and tunable wettability.
- To demonstrate the potential of these gradient structures in applications like temperature-responsive wetting substrates.
Main Methods:
- Combining colloidal lithography with inclined reactive ion etching (RIE) to create OMAGG.
- Utilizing OMAGG as a mask for selective RIE to produce SCAGG.
- Modifying SCAGG with hydrophilic/hydrophobic chemical groups and poly n-isopropyl acrylamide (PNIPAM) for tunable wetting.
Main Results:
- Successfully fabricated OMAGG with geometric gradients.
- Developed SCAGG with well-defined wettability gradients.
- Demonstrated tunable wetting behavior on SCAGG, including a temperature-responsive substrate.
Conclusions:
- The OMAGG fabrication strategy enables the creation of micro/nanostructure arrays with geometric gradients.
- SCAGG exhibit controllable wetting properties, adaptable via surface modification.
- These gradient wettability structures hold significant potential for advanced applications in tissue engineering, microfluidics, and sensors.