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Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
Published on: September 28, 2016
Molecular dynamics modeling of the interface between surface functionalized graphitic structures and
1Department of Civil and Environmental Engineering, Vanderbilt University, VU B 35 1831, Nashville, TN 37235, USA.
Journal of Colloid and Interface Science
|May 20, 2008
Summary
Surface functional groups on graphite significantly influence interactions with calcium-silicate-hydrate (C-S-H), the cement binder. Electrostatic forces and functional group polarity, mediated by calcium ions, are key to understanding graphitic structure/cement adhesion.
Area of Science:
- Materials Science
- Computational Chemistry
- Civil Engineering
Background:
- Calcium-silicate-hydrate (C-S-H) is the primary binder in cementitious materials.
- Graphitic structures are explored as potential additives to enhance cement properties.
- Understanding interfacial interactions is crucial for material design.
Purpose of the Study:
- To investigate the molecular-scale interactions between functionalized graphite and C-S-H.
- To determine the influence of surface functional groups on interfacial properties.
- To elucidate the role of electrostatic forces and ions in adhesion.
Main Methods:
- Molecular dynamics (MD) simulations were employed.
- The 9 Å tobermorite structure served as a model for C-S-H.
- Six distinct graphitic surface structures were simulated: pristine and functionalized (OH, COOH, COO(-), CO, NH(2)).
Main Results:
- Electrostatic forces were found to be dominant in interfacial interactions.
- The polarity of functional groups correlates with C-S-H affinity.
- An optimal density of polar, oxygen-containing groups enhances graphitic structure/cement interaction.
- Ca(2+) counterions play a mediating role in interfacial bonding.
Conclusions:
- Surface functionalization of graphite significantly impacts its interaction with C-S-H.
- Polarity and electrostatic interactions are critical factors for adhesion.
- MD simulations provide molecular-level insights into graphitic additive performance in cement.
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