Intermolecular Interactions of Polymer Molecules Determined by Single-Molecule Force Spectroscopy
| Autor: | Chunqing Zhou, Andreas Zumbusch, Christoph Bräuchle, Alexandra Scherer, Jens Michaelis |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Macromolecules. 38:9821-9825 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma051415d |
| Popis: | Force spectroscopy on the single-molecule level allows the investigation of intramolecular as well as interdomain and intermolecular interactions of both synthetic and natural polymers. In these experiments, a single molecule is usually stretched between two strong attachment points. The force then increases with increasing extension. Under certain conditions, however, force−extension curves result in force plateaus; an increase in extension is observed under constant force. These plateaus do not depend on pulling speed and therefore indicate transitions at equilibrium. Here we present single-molecule data where carboxymethycellulose (CMC) molecules are pulled out of a polymer film into a poor solvent. The resulting force−extension curves show not only one but up to seven force plateaus. The step height from one force plateau to the next is nonuniform but follows a characteristic spacing. This is the first time that nonuniform force plateaus are reported for polymer molecules. A simple model for the polym... |
| Databáze: | OpenAIRE |
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