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Updated: Jun 5, 2026
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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
Published on: December 15, 2015
Selective layer-by-layer self-assembly on patterned porous films modulated by Cassie-Wenzel transition.
Bei-Bei Ke1, Ling-Shu Wan, Yang Li
1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Physical Chemistry Chemical Physics : PCCP
|January 12, 2011
Summary
We developed a new method for modifying patterned porous films using layer-by-layer (LBL) self-assembly. This technique allows for controlled surface modification, creating unique hierarchical structures for advanced applications.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Patterned porous films offer unique surface properties for various applications.
- Controlling surface modification on these films is challenging.
- Layer-by-layer (LBL) self-assembly is a versatile technique for film fabrication.
Purpose of the Study:
- To develop a facile and robust approach for selective modification of patterned porous films.
- To investigate the mechanism of LBL assembly on different patterned film compositions.
- To achieve tunable surface modification for creating hierarchical structures.
Main Methods:
- Preparation of positively charged honeycomb-patterned films using polystyrene-block-poly(N,N-dimethyl-aminoethyl methacrylate) (PS-b-PDMAEMA) and a PS/PDMAEMA blend via the breath figure method.
- Surface quaternization of the patterned films.
- Alternating deposition of alginate and chitosan via LBL self-assembly.
- Characterization using water contact angles, fluorescence microscopy, and quartz crystal microbalance.
Main Results:
- LBL assembly on PS-b-PDMAEMA films showed two distinct growth stages.
- Assembly could be controlled on the top surface or across all surfaces by adjusting deposition cycles.
- A Cassie-Wenzel transition was observed, enabling tunable assembly.
- Selective polyelectrolyte assembly inside pores was achieved for PS/PDMAEMA films.
Conclusions:
- A controllable and selective LBL self-assembly method for patterned porous films was established.
- The study elucidates the assembly mechanism and demonstrates tunable surface modification.
- This approach offers a new route for creating hierarchical structures on patterned surfaces.
