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Adsorption Isotherms I

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed...

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Updated: May 6, 2026

Calcium Carbonate Formation in the Presence of Biopolymeric Additives

Calcium Carbonate Formation in the Presence of Biopolymeric Additives

Published on: May 14, 2019

Parametric Studies of Polyacrylamide Adsorption on Calcite Using Molecular Dynamics Simulation.

Keat Yung Hue¹, Jin Hau Lew¹, Omar K Matar¹

¹Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.

Molecules (Basel, Switzerland)

|January 25, 2025

Summary

Hydrolysed polyacrylamide (HPAM) effectively reduces solids production in carbonate reservoirs by adsorbing onto calcite. Molecular simulations reveal polymer properties and environmental factors influencing this crucial adsorption process.

Keywords:

adsorption molecular simulation parametric studies polymers surfaces

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Area of Science:

Petroleum Engineering
Materials Science
Physical Chemistry

Background:

Solids production in carbonate reservoirs poses significant challenges to oil and gas extraction.
Controlling fines migration and preventing formation damage are critical for reservoir management.
Polyacrylamide-based polymers offer a promising solution for mitigating solids production.

Purpose of the Study:

To investigate the adsorption behavior of hydrolysed polyacrylamide (HPAM) on calcite surfaces.
To understand the influence of polymer properties (molecular weight, charge density) and environmental conditions (temperature, salinity) on adsorption.
To provide insights for optimizing polymer treatments for solids production control in carbonate reservoirs.

Main Methods:

Utilized molecular simulations to model the adsorption of HPAM onto calcite.
Systematically varied polymer molecular weight, charge density, temperature, and salinity in simulations.
Validated simulation outcomes against experimental data.

Main Results:

Adsorption of HPAM onto calcite is influenced by molecular weight, charge density, and temperature, with higher values generally increasing adsorption.
Salinity exhibits a complex effect due to competing salt-bridging and charge-screening mechanisms.
Simulation results show strong agreement with experimental findings.

Conclusions:

HPAM adsorption on calcite is a key mechanism for solids production control in carbonate formations.
Molecular simulations provide a powerful tool for understanding and optimizing HPAM performance.
This study offers valuable data for designing effective polymer-based strategies in reservoir engineering.