Molecularly Flat Films of Linear Polyions and Proteins Obtained by the Alternate Adsorption Method
- 1 December 1997
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 36 (12A), L1608-1611
- https://doi.org/10.1143/jjap.36.l1608
Abstract
Alternately assembled films of poly(ethyleneimine) (PEI) and poly(styrenesulfonate) (PSS), as examined by non-contact atomic force microscopy (AFM), provided molecularly flat surfaces with height difference of several Å. Similar observations on alternate protein films of PEI-glucose oxidase, PEI-ferritin and PSS-peroxidase showed that films with outermost protein layers gave well-packed island structures and that the size of the island and the film roughness were related to the size of proteins used. Subsequent adsorption of a polyion layer decreased the surface roughness of protein layers significantly probably due to bridging of protein molecules by polyion chains.Keywords
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