Interaction grand potential between calcium-silicate-hydrate nanoparticles at the molecular level

Area of Science:

• Materials Science
• Nanotechnology
• Physical Chemistry

Background:

• Calcium-silicate-hydrate (C-S-H) is the primary binding phase in cement and concrete.
• Its properties depend on interactions between nanoscale particles.
• Environmental conditions and particle characteristics affect these interactions.

Purpose of the Study:

• To investigate the interaction forces between C-S-H nanoparticles.
• To develop accurate pair potentials for simulating C-S-H behavior.
• To understand how nanoparticle geometry and orientation influence cohesion.

Main Methods:

• Employed grand canonical Monte Carlo simulations.
• Utilized an extended mean force integration method.
• Derived pair potentials for C-S-H nanoparticles at 10% RH and specific density.

Main Results:

• Cohesion between C-S-H nanoparticles is significantly affected by their aspect ratio.
• Crystallographic misorientation between particles strongly influences interparticle forces.
• Developed a method for realistic simulation of C-S-H particle environments.

Conclusions:

• Particle aspect ratio and crystallographic orientation are critical factors in C-S-H nanoparticle interactions.
• Accurate modeling of cementitious materials requires consideration of nanoparticle dimensions and relative orientations.
• Findings advance the understanding of C-S-H physical and mechanical properties.