Self-Organization of Polystyrene-b-polyacrylic Acid (PS-b-PAA) Monolayer at the Air/Water Interface: A Process Driven by the Release of the Solvent Spreading

Langmuir : the ACS Journal of Surfaces and Colloids
Zineb GuennouniMichel Goldmann

Abstract

We present an in situ structural study of the surface behavior of PS-b-PAA monolayers at the air/water interface at pH 2, for which the PAA blocks are neutral and using N,N-dimethyformamide (DMF) as spreading solvent. The surface pressure versus molecular area isotherm shows a perfectly reversible pseudoplateau over several cycles of compression/decompression. The width of such plateau enlarges when increasing temperature, conversely to what is classically observed in the case of an in-plane first order transition. We combined specular neutron reflectivity (SNR) experiments with contrast variation to solve the profile of each block perpendicular to the surface with grazing-incidence small-angle scattering (GISAXS) measurements to determine the in-plane structure of the layer. SNR experiments showed that both PS and PAA blocks remain adsorbed on the surface for all surface pressure probed. A correlation peak at Q(xy)* = 0.021 Å(-1) is evidenced by GISAXS at very low surface pressure which intensity first increases on the plateau. When compressing further, its intensity decays while Q(xy)* is shifted toward low Q(xy). The peak fully disappears at the end of the plateau. These results are interpreted by the formation of surface ag...Continue Reading

References

Nov 17, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·Emiko MouriNaoya Torikai
Dec 15, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·Alexander WesemannChristiane A Helm
Aug 2, 2005·Journal of Colloid and Interface Science·M SafouaneH Möhwald
Sep 20, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Robert B Cheyne, Matthew G Moffitt
May 22, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Ploysai KaewsaihaHideki Matsuoka
Jan 30, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Benoît Liberelle, Suzanne Giasson
Jul 26, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·P MullerO Théodoly

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Citations

Feb 12, 2020·Materials·Theyencheri Narayanan, Oleg Konovalov
Sep 1, 2019·Journal of Colloid and Interface Science·Janet HoodMatthew G Moffitt
Apr 28, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Anne-Sophie VaillardSophie Cantin
Oct 4, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Zineb GuennouniFabrice Cousin

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