Hostname: page-component-848d4c4894-cjp7w Total loading time: 0 Render date: 2024-06-25T09:11:14.885Z Has data issue: false hasContentIssue false
  • English
  • Français

Combinatorial Mapping of Polymer Film Wettability On Gradient Energy Surfaces

Published online by Cambridge University Press:  17 March 2011

Karen Ashley ,
A. Sehgal ,
Eric J. Amis ,
D. Raghavan  and
A. Karim
Karen Ashley
Affiliation:
Polymer Division, Department of Chemistry, Howard University, Washington DC 20059. kmashley@nist.gov, draghavan@howard.edu
A. Sehgal
Affiliation:
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, amit@nist.gov, eris.amis@nist.gov, alamgir.karim@nist.gov
Eric J. Amis
Affiliation:
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, amit@nist.gov, eris.amis@nist.gov, alamgir.karim@nist.gov
D. Raghavan
Affiliation:
Polymer Division, Department of Chemistry, Howard University, Washington DC 20059. kmashley@nist.gov, draghavan@howard.edu
A. Karim
Affiliation:
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, amit@nist.gov, eris.amis@nist.gov, alamgir.karim@nist.gov
Get access

Abstract

Combinatorial methods were used for studying dewetting of thin hydrophobic polystyrene (PS) and hydrophilic poly(DL-lactic acid) (PDLA) films on chemically modified gradient energy surfaces. Substrate libraries were prepared by immersing passivated Si (Si-H surface functionality) in Piranha solution (H2SO4/H2O2/H2O) at acontrolled rate, yielding a systematic variation of solvent contact angles across the surface. Additionally, chlorosilane-treated Si surfaces were exposed to UV radiation in a gradient fashion under ozone atmosphere such that a range from hydrophobic to hydrophilic conditions was obtained across the surface (≈ 3 cm). Solvent droplet contact angles of water and diiodo methane were used to quantify the spatial variation of surface energy along one axis across the surface. Libraries of thin films of PS or PDLA coatings on gradient energy surfaces orthogonal to gradients in film thickness were screened for dewetting behavior using automated optical microscopy. Contrasting trends in the wettability of PS and PDLA were visibly apparent as a function of surface energy of the substrate. The number density of polygons of the dewet PS films was found to obey a power law relationship with both film thickness and substrate surface hydrophilicity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 700: Symposium S – Combinatorial and Artificial Intelligence Methods in Materials Science , 2001 , S4.7
Copyright
Copyright © Materials Research Society 2002

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Reiter, G., Phy. Rev. Lett, 68, 75(1992).Google Scholar
2. Bischoff, J. et al., Phy. Rev. Lett. 77, 1536(1996).Google Scholar
3. Xie, R. et al., Phy. Rev. Lett. 81, 1251(1998).Google Scholar
4. Jacobs, K. et al. Langmuir, 14, 965(1998).Google Scholar
5. Herminghaus, S. et al., Science, 282, 916(1998).Google Scholar
6. Kim, H. I. et al., Phys. Rev. Lett., 82, 3496(1999).Google Scholar
7. Sferrazza, M. et al., Phy. Rev. Lett., 81, 5173(1998).Google Scholar
8. Seemann, R. et al., Phys. Rev. Lett., 86, 5534(2001).Google Scholar
9. Owens, D. K. et al., J. Appl. Polym. Sci., 13, 1741(1969).Google Scholar
10. Sato, Y. et al. Jpn. J Appl. Phys. 33, 6508(1994).Google Scholar
11. Brochard-Wyart, F. et al., Comp. Rend. De L Acad. Des Sci. Serie II, 314: (1), 1992 Google Scholar
12. Ashley, K. et al, Poly. Comm., accepted (2002)Google Scholar
13. Wu, S., Polym. Interfaces and Adhesion, Marcel Dekker, NY, 1982, p. 151.Google Scholar