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Chitosan Molecules Deposited from Supercritical Carbon Dioxide on a Substrate: Visualization and Conformational Analysis
Author(s) -
Gallyamov Marat O.,
Chaschin Ivan S.,
Gamzazade Arif I.,
Khokhlov Alexei R.
Publication year - 2008
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200800419
Subject(s) - macromolecule , supercritical carbon dioxide , supercritical fluid , scaling , exponent , chemical physics , adsorption , molecule , materials science , substrate (aquarium) , chitosan , adhesion , random walk , crystallography , chemistry , nanotechnology , chemical engineering , organic chemistry , composite material , geometry , mathematics , biochemistry , linguistics , philosophy , oceanography , engineering , geology , statistics
We deposited single individual macromolecules of chitosan directly from their solutions in supercritical carbon dioxide onto a substrate surface and applied SFM method to analyze the macromolecular conformation. By means of image processing of many different SFM‐contours of the visualized individual macromolecules, we determined the scaling exponent ν , which describes the correlation between mean square end‐to‐end distances and contour lengths of the adsorbed macromolecules. It was revealed, that the macromolecules, deposited from scCO 2 and visualized by SFM, tended to adopt rather extended conformation. The scaling exponent ν was found to be in range of 0.78–0.8, which was slightly above the 3/4 value, corresponding to 2D self‐avoiding walk statistics. Good adhesion of chitosan coatings directly deposited from scCO 2 is expected.