Synchronous Generation of Nano- and Microscaled Hierarchical Porous Polyelectrolyte Multilayers for Superwettable Surfaces

Jing Yu, Songyang Han, Joung Sook Hong, Oishi Sanyal, Ilsoon Lee

Research output: Contribution to journalArticle

  • 2 Citations

Abstract

We created both a superhydrophilic polymer surface and a superhydrophobic surface by using the poly(acrylic acid) (PAA)/poly(allylamine hydrochloride) (PAH) multilayers with the synchronously generated hierarchical porous surface structures. The formation of surface and pore structures induced at acidic pH values is subject to the composition, distribution, and molecular weights of polyelectrolytes in the layer-by-layer (LbL) assembled film, leading to a variety of unique surface topographies and porous structures located on different scales. During the porous induction at pH 2.0, both nano- and microscaled features synchronously developed on the surface as a result of the unique combination of high-molecular-weight PAH (900K g/mol) and low molecular weight PAA (15K g/mol), along with a much reduced deposition time of 1 min. Although thermally cross-linked, the porous surface with hierarchical structure could achieve superhydrophilicity due to the remaining free amine and carboxylate groups on the porous structures. A complete switch from the superhydrophilic to the superhydrophobic surface was achieved via a simple chemical vapor deposition of trichloro(1H,1H,2H,2H-perfluoro-octyl)silane. In this work, the effects of molecular weight of polyelectrolytes (15K-900K g/mol), deposition time (10-900 s) during the LbL assembly, and pH (1.8 to 2.4) for the porous induction on the surface topography, pore structures, and wetting behavior were investigated in detail. A variety of unique porous surface structures on different length scales were systematically studied by controlling the above parameters.

LanguageEnglish (US)
Pages8494-8500
Number of pages7
JournalLangmuir
Volume32
Issue number33
DOIs
StatePublished - Aug 23 2016

Profile

Polyelectrolytes
Multilayers
Molecular Weight
Molecular weight
Surface structure
carbopol 940
Surface topography
Pore structure
Silanes
molecular weight
Amines
hydrochlorides
Polymers
Acrylics
Wetting
Chemical vapor deposition
induction
topography
Switches
porosity

ASJC Scopus subject areas

  • Medicine(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Synchronous Generation of Nano- and Microscaled Hierarchical Porous Polyelectrolyte Multilayers for Superwettable Surfaces. / Yu, Jing; Han, Songyang; Hong, Joung Sook; Sanyal, Oishi; Lee, Ilsoon.

In: Langmuir, Vol. 32, No. 33, 23.08.2016, p. 8494-8500.

Research output: Contribution to journalArticle

Yu, Jing ; Han, Songyang ; Hong, Joung Sook ; Sanyal, Oishi ; Lee, Ilsoon. / Synchronous Generation of Nano- and Microscaled Hierarchical Porous Polyelectrolyte Multilayers for Superwettable Surfaces. In: Langmuir. 2016 ; Vol. 32, No. 33. pp. 8494-8500
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