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Calculates gas adsorption isotherms via BVT/GCMC Monte Carlo simulations in a porous framework using MLIP.
Calculates gas adsorption isotherms via BVT/GCMC Monte Carlo simulations in a porous framework using MLIP.
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To predict the macroscopic adsorption uptake of a gas (or gas mixture) in a porous material at a specific temperature and pressure. The skill relies on Grand Canonical Monte Carlo (GCMC) simulations where the host-guest and guest-guest interactions are calculated using a Machine Learning Interatomic Potential (MLIP: MACE, FairChem, MatGL).
fairchem-agent, mace-agent, matgl-agent).run_gcmc.py.# Env: fairchem-agent (or other MLIP-specific env)
python .agents/skills/chem-sorption-gcmc/scripts/run_gcmc.py \
--cif path/to/relaxed_supercell.cif \
--calculator fairchem \
--model-name uma-s-1p1 \
--task-name omol \
--steps 50000 \
--temperature-K 298 \
--pressure-bar 1.0 \
--adsorbate CO2 \
--output-dir ./results/single_gcmc
run_gcmc_multi.py.# Env: fairchem-agent
python .agents/skills/chem-sorption-gcmc/scripts/run_gcmc_multi.py \
--cif path/to/relaxed_supercell.cif \
--calculator fairchem \
--model-name uma-s-1p1 \
--task-name omol \
--steps 50000 \
--temperature-K 298 \
--gases CO2 N2 \
--y 0.15 0.85 \
--p-total-bar 1.0 \
--output-dir ./results/multi_gcmc
--cif: Path to the relaxed host framework.--calculator: The backend MLIP (fairchem, mace, matgl).--model-name: Name or path to the MLIP weights (e.g., uma-s-1p1.pt, MACE-MH-1).--task-name: Optional, required by some models (omol for UMA and MACE-MH).--steps: Number of Monte Carlo steps (minimum 50,000 recommended for equilibration).--temperature-K: Sim temperature.--pressure-bar (Single): Gas pressure in bar.--p-total-bar (Multi): Total mixture pressure in bar.--gases / --y (Multi): Species list and corresponding mole fractions in the vapor phase.Example 1: Generating an Isotherm Point (CO2, 0.1 bar, 298K) with UMA:
# Env: fairchem-agent
python .agents/skills/chem-sorption-gcmc/scripts/run_gcmc.py \
--cif ./data/MOF-5_supercell.cif \
--calculator fairchem \
--model-name uma-s-1p1 \
--task-name omol \
--steps 50000 \
--temperature-K 298 \
--pressure-bar 0.1 \
--adsorbate CO2 \
--output-dir ./out/0.1_bar
--device cuda).nmols.png and energy.png inside the output-dir to visually confirm that the number of molecules and energy have plateaued (equilibrated). If the trend is still rising/falling at the end of the simulation, you must re-run with more --steps (or restart the trajectory).--restart-traj ./out/mc.traj to continue a previous run.Author: Artur Lyssenko Contact: GitHub @arturlyssenko12
name: chem-sorption-gcmc description: Calculates gas adsorption isotherms via BVT/GCMC Monte Carlo simulations in a porous framework using MLIP. category: [materials, chemistry]
---
name: chem-sorption-gcmc
description: Calculates gas adsorption isotherms via BVT/GCMC Monte Carlo simulations in a porous framework using MLIP.
category: [materials, chemistry]
---
# chem-sorption-gcmc
## Goal
To predict the macroscopic adsorption uptake of a gas (or gas mixture) in a porous material at a specific temperature and pressure. The skill relies on Grand Canonical Monte Carlo (GCMC) simulations where the host-guest and guest-guest interactions are calculated using a Machine Learning Interatomic Potential (MLIP: MACE, FairChem, MatGL).
## Prerequisites
- **Input**: A relaxed framework structure in CIF (or XYZ) format. The structure should ideally be processed by [chem-sorption-relax](../chem-sorption-relax/SKILL.md) to ensure proper supercell dimensions.
- **Conda environment**: Depends on the MLIP used (e.g., `fairchem-agent`, `mace-agent`, `matgl-agent`).
## Instructions
1. **Perform Single-Component GCMC (Optional)**: If you are investigating a single gas species, use `run_gcmc.py`.
```bash
# Env: fairchem-agent (or other MLIP-specific env)
python .agents/skills/chem-sorption-gcmc/scripts/run_gcmc.py \
--cif path/to/relaxed_supercell.cif \
--calculator fairchem \
--model-name uma-s-1p1 \
--task-name omol \
--steps 50000 \
--temperature-K 298 \
--pressure-bar 1.0 \
--adsorbate CO2 \
--output-dir ./results/single_gcmc
```
2. **Perform Multi-Component GCMC (Optional)**: If you are simulating a gas mixture (e.g. flue gas separation 15% CO2 / 85% N2), use `run_gcmc_multi.py`.
```bash
# Env: fairchem-agent
python .agents/skills/chem-sorption-gcmc/scripts/run_gcmc_multi.py \
--cif path/to/relaxed_supercell.cif \
--calculator fairchem \
--model-name uma-s-1p1 \
--task-name omol \
--steps 50000 \
--temperature-K 298 \
--gases CO2 N2 \
--y 0.15 0.85 \
--p-total-bar 1.0 \
--output-dir ./results/multi_gcmc
```
### Key Parameters
- `--cif`: Path to the relaxed host framework.
- `--calculator`: The backend MLIP (`fairchem`, `mace`, `matgl`).
- `--model-name`: Name or path to the MLIP weights (e.g., `uma-s-1p1.pt`, `MACE-MH-1`).
- `--task-name`: Optional, required by some models (`omol` for UMA and MACE-MH).
- `--steps`: Number of Monte Carlo steps (minimum 50,000 recommended for equilibration).
- `--temperature-K`: Sim temperature.
- `--pressure-bar` (Single): Gas pressure in bar.
- `--p-total-bar` (Multi): Total mixture pressure in bar.
- `--gases` / `--y` (Multi): Species list and corresponding mole fractions in the vapor phase.
## Examples
**Example 1: Generating an Isotherm Point (CO2, 0.1 bar, 298K) with UMA:**
```bash
# Env: fairchem-agent
python .agents/skills/chem-sorption-gcmc/scripts/run_gcmc.py \
--cif ./data/MOF-5_supercell.cif \
--calculator fairchem \
--model-name uma-s-1p1 \
--task-name omol \
--steps 50000 \
--temperature-K 298 \
--pressure-bar 0.1 \
--adsorbate CO2 \
--output-dir ./out/0.1_bar
```
## Constraints
- **Simulation Time**: GCMC with MLIPs can be computationally intensive. Use GPUs when available (`--device cuda`).
- **Equilibration**: You MUST check the generated `nmols.png` and `energy.png` inside the `output-dir` to visually confirm that the number of molecules and energy have plateaued (equilibrated). If the trend is still rising/falling at the end of the simulation, you must re-run with more `--steps` (or restart the trajectory).
- **Restarting**: You can pass `--restart-traj ./out/mc.traj` to continue a previous run.
---
**Author:** Artur Lyssenko
**Contact:** [GitHub @arturlyssenko12](https://github.com/arturlyssenko12)
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
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Quality
69/100
Promising
Trust
58/100
Do not auto-install
Audit
76/100
Needs review
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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