la3003004_si_001.pdf (226.1 kB)
Adhesion of Polyelectrolyte Multilayers: Sealing and Transfer of Microchamber Arrays
journal contribution
posted on 2012-04-03, 00:00 authored by Maxim V. Kiryukhin, Shu Mei Man, Armine Tonoyan, Hong Yee Low, Gleb B. SukhorukovPolyelectrolyte multilayer (PEM) films with array of
responsive
microchambers are promising candidates for site-specific release of
chemicals in small and precisely defined quantities on demand. It
requires effective sealing of the microchambers toward a support to
prevent leakage of a cargo. In this paper, we study the pressure-induced
adhesion of poly(allylammonium)-poly(4-styrenesulfonate) (PAH-PSS)
multilayers assembled on different templates toward the poly(4-styrenesulfonate)-poly(diallyldimethylammonium)
multilayer. The tensile bond strength increases from 0.4 to 3.5 MPa
upon the increase of PAH-PSS bilayers from 10 to 40, if assembled
on a silicon template. Weaker tensile bond strength of 0.35 MPa between
the PAH-PSS multilayer and a poly(methylmethacrylate) (PMMA) template
results in adhesive break at this interface and allows mechanical
removal of the template. The successful PEM transfer is demonstrated
for templates of various geometrical patterns, while the tensile break
of a multilayer film happens for the others.