We use either tween 80 or tween 20 to mix the essential oil with acid while we are preparing the stock solution in order to carry out the test of anticorrosion activity in an acidic medium.
I'm enquiring whether the blender agent ( surfactant, emulsifier) contributing also to the activity with some proportion or not!
Dear Dr. Ayoub Najem ,
at the moment, the most commonly surfactants used are: sucrose esters, sorbitan fatty acid esters, glycerolfatty acid esters (polyglycerols), polyoxyethylene sorbitan fatty acid esters (polysorbates) and polyoxyethylene ether. The two most used surfactants for the formulation of EOs-based colloidal systems are the polysorbates Tween 80 and Tween 20, since they have been demonstrated to give stable formulations without the need of a co-surfactant. This is an advantageous aspect both from the formulation and toxicological point of view. In fact, this aspect allows the reduction Tween 80 on the achievement of eugenol NEs in terms of droplet diameter and stability. Although both of them showed a great impact on droplet size, size distribution and PDI value, Tween 80 was the most effective.
In fact, at the SOR 1, NEs with a medium diameter of 190 nm and 95 nm were obtained with Tween 20 and Tween 80, respectively. This could be ascribed to the different structure of the non-polar tail that is saturated and linear for Tween 20 while unsaturated and bended for Tween 80. The presence of double bonds in the hydrocarbon chain was able to give smaller droplets representing an important feature of the surfactants. Some Authors reported the use of Cremophor EL (polyoxyethylene ether surfactants family) in the formulation of finger citron EO. It showed an emulsifying behaviour comparable or even better with respect to that of Tween 80; in fact, it formed a stable interfacial film at a lower concentration. Mixed with the co-surfactants ethanol, 1, 2-propanediol, glycerol, butanol and PEG-400, Cremophor EL was able to give stable NEs along time.
For more details, please see the very interesting source:
- An Overview of Micro- and Nanoemulsions asVehicles for Essential Oils: Formulation, Preparationand Stability
Lucia Pavoni, Diego Romano Perinelli, Giulia Bonacucina, Marco Cespi and Giovanni Filippo Palmieri
Nanomaterials,10, 135; (2020) - doi:10.3390
Available at: https://tinyurl.com/ydojg9t6
My best regards, Pierluigi Traverso.
We use either tween 80 or tween 20 to mix the essential oil with acid while we are preparing the stock solution in order to carry out the test of anticorrosion activity in an acidic medium. I'm enquiring whether the blender agent ( surfactant, emulsifier) contributing also to the activity with some proportion or not!
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials
- Inorganic Materials
- Metals
- Alloys
- Steel