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Influence of drying time of polyelectrolyte multilayers on the compression-induced pattern formation
Xiao Gong1, Jie Yang, Lulu Han
1Key Laboratory of Macromolecular Synthesis and Functionalization, Ministry of Education, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 5, 2008
Summary
Polyelectrolyte multilayer patterns formed by compression depend on drying time. Shorter drying times create less stable patterns like strips and ridges, while longer drying times yield more stable linear patterns.
Area of Science:
- Materials Science
- Polymer Science
- Surface Chemistry
Background:
- Polyelectrolyte multilayers (PEMs) are versatile materials with tunable properties.
- Previous studies showed PEM compression by poly(dimethylsiloxane) (PDMS) stamps under pressure.
- The influence of pre-compression drying on PEM pattern formation was not well understood.
Purpose of the Study:
- To investigate the effect of drying time on the pattern formation of poly(diallyldimethylammonium chloride) (PDADMAC) containing multilayers.
- To explore the stability of compression-induced patterns under varying conditions.
- To establish a model explaining the observed phenomena.
Main Methods:
- Fabrication of poly(4-styrenesulfonic acid-co-maleic acid) sodium salt (PSSMA)/PDADMAC multilayers.
- Controlled drying of multilayers at 70% relative humidity and room temperature for different durations (2, 6, 12 h).
- Compression using a PDMS stamp with linear patterns and subsequent analysis of pattern morphology and stability.
Main Results:
- Drying time significantly influenced pattern formation: 2h drying yielded double strips, 6h yielded high ridges, and 12h yielded linear patterns.
- These pattern formation phenomena were independent of layer number and salt concentration.
- Patterns formed after shorter drying times (strips, ridges) were less stable and could be erased by water incubation, while patterns from longer drying times were highly stable.
Conclusions:
- The drying time of PEMs prior to compression is a critical factor controlling pattern morphology and stability.
- Water content within the multilayer structure plays a key role in the observed pattern formation.
- The findings offer a method for creating tunable and stable patterns in PEMs for potential applications.
