Dear Colleagues
Surfactants are used to ensure the stability of any suspended solution. What is the mechanism by which the surfactant can prevent the deposition of the suspended particles in the solution?
Regards
Dear Miqdam:
The system of nanoparticles in water has a large specific surface area (m2 / g). Consequently, the system has a large surface Gibbs energy (J / mol). In accordance with the laws of thermodynamics, the Gibbs surface energy tends to decrease due to a decrease in the specific surface (particle pooling) or adsorption of surfactant on the surface, if they exist in solution. If the surface size is maintained, the surfactant is reduced by the surface tension of the nanoparticles. The smaller the surface tension, the closer the system is to thermodynamically stable. Ionogenic surfactants in aqueous media are oriented in organic radicals to the particle, and ionogenous group to water. In this case, the stabilization of particles is explained by the DLFO theory. Electrostatic repulsive forces between particles are greater than the forces of attraction. In organic media with hydrophilic particles, organic radicals are directed toward the medium.The surface tension decreases.
Best regards.
Dear Dr. Miqdam,
Professor Yuri already answered it very nicely. I will just like to add one very basic thing. Surfactant also act like a coating over the nanoparticles which helps to develop a kind of repulsion bond. This prevents agglomeration of nanoparticles and sedimentation finally.
Hope that helps in understanding.
Best regards
Dear Dr Mirgorod
Thank you for your very interesting answer. Your contribution is so valuable that other colleagues hesitate answering the question.
Regards
Dear Dr Sharma
Thank you for your valuable contribution.
Regards
Couldn't agree more with prof Yuri. Another point if i may add is the tanford/hydrophobic effect of surfactants. Not only their existence reduces the surface/interfacial tension by their orientation in a system, thus the Gibbs free energies. Hence understanding both hydophilic/hdropobic moities is crucial and especially in coating or modifying surfaces as mentioned by Ravi and etc etc.
Dear Dr suhaimi
Thank you for your valuable contribution
Regards
The surfactant is a compound that allows two liquids to combine on a chemical level. This causes your cleaning products to actively foam and clean by breaking down the surface tension of water. The function of surfactant use lies in its foaming abilities, allowing the product to break down the oil, grease, and soil to remove it from countertops, clothing, and skin alike.
https://www.cleanipedia.com/gb/in-the-home/what-is-a-surfactant
Interesting and important Question, l am following.
Kind Regards
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