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Stability of polypeptide multilayers as studied by in situ ellipsometry: Effects of drying and post-buildup changes in temperature and pH
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
2004 (English)In: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 126, 17009-17015 p.Article in journal (Refereed)
Abstract [en]

Polyelectrolyte Multilayers (PEM) of poly(L-glutamic acid) (PGA) and poly(L-lysine) (PLL) with an initial layer of polyethyleneimine (PEI) were built on silica and titanium surfaces using the Layer-by-Layer (LbL) technique. The stability of the film during drying/rewetting, temperature cycles and pH shifts was studied in situ by means of ellipsometry. The filmthickness was found to decrease significantly (approximately 70%) upon drying, but the original film-thickness was regained upon rewetting and the buildup could be continued. The thickness in dry state was found to be extremely sensitive to ambient humidity, needing several hours to equilibrate. Changes in temperature and pH was also found to influence the multilayer thickness, leading to swelling and de-swelling of as much as 8% and 10-20% respectively. The film does not necessarily regain its original thickness as the pH is shifted back, but instead shows clear signs of hysteresis.

Place, publisher, year, edition, pages
2004. Vol. 126, 17009-17015 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26626OAI: oai:DiVA.org:ri-26626DiVA: diva2:1053629
Note
A1683Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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