التفاصيل البيبلوغرافية
| العنوان: |
Single-Molecule Elasticity Measurements of the Onset of Excluded Volume in Poly(Ethylene Glycol). |
| المؤلفون: |
Dittmore, Andrew1, McIntosh, Dustin B.2, Halliday, Sam3, Saleh, Omar A.1 saleh@engineering.ucsb.edu |
| المصدر: |
Physical Review Letters. 9/30/2011, Vol. 107 Issue 14, p148301-1-148301-5. 5p. |
| مصطلحات موضوعية: |
*POLYETHYLENE glycol, *ELASTICITY, *RANDOM walks, *POLYMER research, *GAUSSIAN processes, *ATOMIC force microscopy |
| مستخلص: |
A polymer must reach a certain size to exhibit significant excluded-volume interactions and adopt a swollen random-walk configuration. We show that single-molecule measurements can sense the onset of swelling by modulating the effective chain size with force: as the force is reduced from a large value, the polymer is first highly aligned, then a Gaussian coil, then finally a swollen chain, with each regime exhibiting a distinct elasticity. We use this approach to quantify the structural parameters of poly(ethylene glycol) and show that they vary in the expected manner with changes in solvent. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |
