Authors :
Dina Murshed; Fuad Saleh; Niyazi A. S. Al-Areqi; Nermeen Al-Absi
Volume/Issue :
2nd ICTSA-2022
Google Scholar :
https://bit.ly/3TmGbDi
Scribd :
https://bit.ly/3GtLlsb
DOI :
https://doi.org/10.5281/zenodo.7788550
Abstract :
Surfactants play an important role in many
industries such as cosmetics, perfumes, medicines, and
foods, as they are widely recognized due to the diversity
of their structures and their analysis, and are
responsible for the formation of O/W or W/O emulsions
as reported in the literature. The current work
presented an investigation on the physicochemical
properties of sodium dodecyl sulfate (SDS) and its effect
on the formation of sesame oil/ water microemulsion in
the presence of lauryl alcohol (LA) as a cosurfactant
using electrical conductivity and hydrodynamic viscosity
measurements. It has been found that the critical micelle
concentration (CMC) of SDS in the aqueous
environment is 10.75 × 10-3 M, which is consistent with
its literature value reported. It was observed that the
CMC gradually decreases with increasing temperature.
However, the variation in the degree of micelle
ionization with temperature showed a maximum and
minimum at 35 OC and 45 OC, respectively. The
variation of Gibbs free energy of SDS micellization as a
function of temperature. Indicated that the SDS
micellization in aqueous media is a spontaneous process
and is thermodynamically favorable. It was clearly
noticed that the CMC of SDS goes on increasing with the
addition of sesame oil. which was also reflected by a
gradual drop in the relative viscosity as the oil %
increases. This may be attributed to the fact that oil
droplets undergo fractioning and then get emulsified in
the hydrophobic cores of SDS micelles. Because of such
emulsification, the size of SDS micelle increased, and
consequently higher concentrations of SDS would be
required to reach an equilibrium micellization with the
further addition of oil as a disperse phase. The
effectiveness of SDS on emulsification demonstrated the
ability of SDS surface hypotension in the formation of
Microemulsions. Accordingly, SDS can be used as a
powerful emulsifying agent to minimize the surface
tension in the water medium and produce
Microemulsions that would have many promising future
applications.
Keywords :
Surfactants; Microemulsions; Sodium Dodecyl Sulfate; Sesame Oil; Lauryl Alcohol; CMC; Electrical Conductivity.
Surfactants play an important role in many
industries such as cosmetics, perfumes, medicines, and
foods, as they are widely recognized due to the diversity
of their structures and their analysis, and are
responsible for the formation of O/W or W/O emulsions
as reported in the literature. The current work
presented an investigation on the physicochemical
properties of sodium dodecyl sulfate (SDS) and its effect
on the formation of sesame oil/ water microemulsion in
the presence of lauryl alcohol (LA) as a cosurfactant
using electrical conductivity and hydrodynamic viscosity
measurements. It has been found that the critical micelle
concentration (CMC) of SDS in the aqueous
environment is 10.75 × 10-3 M, which is consistent with
its literature value reported. It was observed that the
CMC gradually decreases with increasing temperature.
However, the variation in the degree of micelle
ionization with temperature showed a maximum and
minimum at 35 OC and 45 OC, respectively. The
variation of Gibbs free energy of SDS micellization as a
function of temperature. Indicated that the SDS
micellization in aqueous media is a spontaneous process
and is thermodynamically favorable. It was clearly
noticed that the CMC of SDS goes on increasing with the
addition of sesame oil. which was also reflected by a
gradual drop in the relative viscosity as the oil %
increases. This may be attributed to the fact that oil
droplets undergo fractioning and then get emulsified in
the hydrophobic cores of SDS micelles. Because of such
emulsification, the size of SDS micelle increased, and
consequently higher concentrations of SDS would be
required to reach an equilibrium micellization with the
further addition of oil as a disperse phase. The
effectiveness of SDS on emulsification demonstrated the
ability of SDS surface hypotension in the formation of
Microemulsions. Accordingly, SDS can be used as a
powerful emulsifying agent to minimize the surface
tension in the water medium and produce
Microemulsions that would have many promising future
applications.
Keywords :
Surfactants; Microemulsions; Sodium Dodecyl Sulfate; Sesame Oil; Lauryl Alcohol; CMC; Electrical Conductivity.
