Laser assisted generation of micro/nanosize emulsions

Spectroscopic Characterization of Emulsions Generated with a New Laser-Assisted Device

“…After this, the microsize This behavior of the FTIR spectra is a real-time indication of the destabilization of emulsions. Taking into consideration that the dimensions of the droplets at the beginning of the FTIR measurements were around 270 nm for the unirradiated emulsion, and around 142 nm for the irradiated one [12], the modifications of the peak absorbance recorded in the first spectra ( Figure 5) might be associated with Ostwald ripening and coalescence of the small droplets, which are processes involved in the destabilization of emulsions. First, Ostwald ripening causes nanosize droplets to form larger size droplets, due to mass transfer from smaller to larger droplets.…”

“…Considering that the dimensions of the droplets during the creaming process are larger than the initial ones, their migration at the surface of the ATR crystal is responsible for more significant modifications of the absorbance maxima. Destabilization of the emulsions end with a total separation of the two phases [1,12,35].…”

“…Considering that the dimensions of the droplets during the creaming process are larger than the initial ones, their migration at the surface of the ATR crystal is responsible for more significant modifications of the absorbance maxima. Destabilization of the emulsions end with a total separation of the two phases [1,12,35]. The steep modifications of the curves representing the time evolution of absorbance maxima were due to the formation of one large drop of vitamin A at the surface of the ZnSe crystal, hence, the increase of the absorbance peak at 2922 cm −1 .…”

“…A new method of emulsification was described in [12]. A solution of sodium tetradecyl sulfate (STS) in water, 10% concentration, and oily vitamin A were mixed with a double-syringe system and then exposed to laser radiation, obtaining an emulsion with nano-and micro-droplets.…”

“…In our case, the reduced dimensions of the droplets after irradiation, together with surfactant action of the STS molecules, led to a better stability of the irradiated emulsion when compared to one unexposed to laser radiation. Another property is the emulsion structure in terms of dimensions of constituent drops [12]. The molecular content of emulsions is another parameter and it is important to know this, since applications of emulsions depend basically on their molecular interactions with different targets.…”