Nano Archive

Single-molecule force Spectroscopy measurements of interactions between C-60 fullerene molecules

Gu, Chao and Ray, Chad and Guo, Senli and Akhremitchev, Boris B. (2007) Single-molecule force Spectroscopy measurements of interactions between C-60 fullerene molecules. JOURNAL OF PHYSICAL CHEMISTRY C, 111 (35). pp. 12898-12905.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp0717645

Abstract

The hydrophobic effect is important for many biological and technological processes. Despite progress in theory, experimental data clarifying the structure of water and the interactions between hydrophobic solutes at the nanometer scale are scarce because of the very low solubility of hydrophobic species. This article describes single-molecule force spectroscopy measurements of interactions between single fullerene C-60 molecules in water. The C60 molecules were tethered by flexible poly(ethylene glycol) linkers to AFM probes and substrates, removing the uncertainty of the aggregation state of solution-based approaches and spurious surface effects. Our analysis of the dependence of the measured most-probable rupture force on the most-probable loading rate considered the deviations from the conventional Bell-Evans model caused by the effects of the anharmonic tether, as well as by the finite depth and shape of the potential well. The kinetic parameters of the activation barrier width, the dissociation rate of the C-60-C-60 dimer, and the activation energy are reported. The measured values differ significantly from predictions based on molecular dynamics simulations, indicating that further advances in computer simulations are necessary for the development of a model showing quantitative agreement with experimental results.

Item Type:Article
Subjects:Analytical Science > Microscopy and probe methods
Physical Science > Nano objects
Material Science > Nanochemistry
ID Code:2802
Deposited By:Farnush Anwar
Deposited On:13 Jan 2009 16:54
Last Modified:27 Jan 2009 12:43

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