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Related Concept Videos

Cohesion01:07

Cohesion

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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a...
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Entropy and Solvation02:05

Entropy and Solvation

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Specific Gravity of Aggregate01:19

Specific Gravity of Aggregate

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Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
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Drug Product Performance: In Vitro–In Vivo Correlation01:20

Drug Product Performance: In Vitro–In Vivo Correlation

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In pharmaceutical development, it's crucial to establish a predictive in vitro–in vivo correlation (IVIVC) for two or more formulations to gain a comprehensive understanding of release properties. IVIVC reduces the need for costly in vivo studies and facilitates the establishment of meaningful dissolution specifications with significant cost savings and decreased regulatory burden. Furthermore, a meaningful IVIVC should predict Cmax and AUC within 20%, aligning with FDA guidance while...
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Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

467
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
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Coagulation01:06

Coagulation

491
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Related Experiment Video

Updated: Oct 24, 2025

Methane Hydrate Crystallization on Sessile Water Droplets
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Correlating Antiagglomerant Performance with Gas Hydrate Cohesion.

Anh Phan1, Michail Stamatakis1, Carolyn A Koh2

  • 1Department of Chemical Engineering, University College London, London WC1E 7JE, U.K.

ACS Applied Materials & Interfaces
|August 12, 2021
PubMed
Summary

Molecular dynamics simulations reveal key factors governing antiagglomerant performance in preventing hydrate formation. Understanding these molecular mechanisms can accelerate the design of new antiagglomerants for hydrocarbon transport systems.

Keywords:
cohesive forceconfigurational entropyenthalpy of solvationgas hydrate agglomerationmolecular dynamicssolvation free energy

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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device

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Area of Science:

  • Petroleum Engineering
  • Materials Science
  • Physical Chemistry

Background:

  • Hydrate formation in hydrocarbon transport systems poses significant risks, including pipe blockage.
  • The molecular mechanisms underlying antiagglomerant (AA) effectiveness in preventing hydrate agglomeration are not fully understood.
  • Understanding structure-performance relationships is crucial for designing efficient AAs.

Purpose of the Study:

  • To investigate the molecular mechanisms of antiagglomerant performance in hydrocarbon-hydrate systems.
  • To correlate molecular structure changes with macroscopic antiagglomerant effects.
  • To validate a simulation approach for predicting antiagglomerant efficacy.

Main Methods:

  • Molecular dynamics simulations were employed to study gas hydrate nanoparticles in liquid hydrocarbons with various AAs.
  • Cohesion energy between hydrate nanoparticles was quantified in the presence of different AAs.
  • Simulation results were compared against experimental data obtained using a micromechanical force apparatus at high pressure.

Main Results:

  • Excellent agreement was achieved between simulation predictions and experimental data.
  • The study identified entropy and free energy of solvation of AAs as key performance descriptors.
  • Molecular orientation at hydrate-oil interfaces also influences antiagglomerant performance.

Conclusions:

  • The proposed simulation method shows promise as an in silico screening tool for new antiagglomerant molecules.
  • Entropy, solvation free energy, and interfacial molecular orientation are critical factors for predicting AA performance.
  • These findings can accelerate the development of novel antiagglomerants for improved flow assurance in hydrocarbon transport.