DSC as a Tool to Predict Emulsion Stability

Labes-Carrier, C.; Dumas, Jean‐Pierre; Mendiboure, Bruno; Lachaise, J.

doi:10.1080/01932699508943709

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…Hence, surfactant as an emulsifying agent is required to attain prolonged and/or steady-state stabilization of such droplets. Emulsions and microemulsions can frequently be prepared as well dispersed systems in the presence of aliphatic alcohol, amine, or hydrocarbon. − They are called cosurfactant or coemulsifier though the role of these compounds has not been understood well at present. n -Hexadecane is also added as the third component in other colloidal assemblies such as emulsions , and vesicles 12 and so forth.…”

Section: Introductionmentioning

confidence: 99%

Dispersion and Stabilizing Effects of n-Hexadecane on Tetralin and Benzene Metastable Droplets in Surfactant-Free Conditions

et al. 1999

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The size distribution of metastable oil droplets in water was investigated by the dynamic light-scattering method for tetralin (1,2,3,4-tetrahydronaphthalene), benzene, n-hexadecane, and their mixtures under surfactant-free conditions. For pure tetralin, droplets appeared with multiple peak distributions, first at sizes around 5 × 102 to 2 × 103 nm, and shortly coalesced to grow discretely to 3 μm within 30 min. On the contrary, for pure n-hexadecane, droplets appeared with a single location at 40−120 nm and their sizes remained unchanged for several hours. The addition of a small amount of n-hexadecane, even at 1:1000 and 1:100 molar ratios, to tetralin significantly improved the dispersion and stability of tetralin droplets. Peculiarly, the interfacial tension of the mixed oils with water was raised with the n-hexadecane concentration. The dispersed solutions of benzene could be further stabilized (for as long as 1 month) with the addition of hexadecane. Expulsion of n-hexadecane onto the droplet surfaces and the related surface modification seem to be responsible for the stabilization effects.

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Section: Introductionmentioning

confidence: 99%

Dispersion and Stabilizing Effects of n-Hexadecane on Tetralin and Benzene Metastable Droplets in Surfactant-Free Conditions

et al. 1999

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Influence of Surfactant on the Thermal Behavior of Marigold Oil Emulsions with Liquid Crystal Phases

Santos¹,

Rocha‐Filho

2007

Drug Development and Industrial Pharmacy

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Vegetable oils have been largely consumed owing to the interest of pharmaceutical and cosmetic industries in using natural raw materials. The production of stable emulsions with vegetable oils challenges formulators due to its variability in composition and fatty acids constitution within batches produced. In the present work, it was studied that the influence of the size of carbon chain and the number of ethylene oxide moieties of the surfactant on the thermal behavior of eight emulsions prepared with marigold oil stabilized by liquid crystal phases. Differential scanning calorimetry (DSC) was used to determine the thermal behavior of the emulsions. The ratio of bound water was calculated, being between 29.0 and 42.0%, confirming the extension of the liquid-crystalline net in the external phase. Changing the lipophilic surfactant from Ceteth-2 to Steareth-2, there was an increase in the temperature of phase transition of the liquid crystal influencing the system stability. Calorimetric study is very useful in understanding the performance of liquid crystals with the increase of temperature and to estimate emulsions stability.

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Prediction of the Amount of Ice Formation in the Water Dispersed Phase of a W/O Emulsion

Wardhono¹,

Lanoisellé²,

Clausse³

2015

MAS

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This paper deals with the investigation of the effect of solute concentration on the amount of ice formed within some materials such as NaCl + water and glycerol + water solutions dispersed into a W/O emulsion. The investigations were carried out by inserting sample emulsions into a Differential Scanning Calorimeter (DSC-131 evoSetaram, France). The sample emulsions were submitted to a steady cooling-heating program at constant heating rate, = 2.5 K/min between + 20 and – 60 °C in order to get the freezing of water during cooling and its melting during heating. The proportion of ice formed, P was then calculated from the area of the recorded melting signal related to the amount of water frozen. The values obtained were compared to the ones deduced from thermodynamics treatments that needs the knowledge of the conditions of freezing of the solutions in the equilibria domain ice + solution completed by the extension of the equilibrium curve ice + solution in the metastable area of the solutions respect to the salt. The results obtained are in good agreement for glycerol solutions. For NaCl solutions the results obtained from DSC determination show lower values due to the difficulties to determine precisely the ice melting energies deduced from the melting signals. In that case the theoretical determination from the phases diagram appears to be more reliable.

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DSC as a Tool to Predict Emulsion Stability

Cited by 3 publications

References 14 publications

Dispersion and Stabilizing Effects of n-Hexadecane on Tetralin and Benzene Metastable Droplets in Surfactant-Free Conditions

Dispersion and Stabilizing Effects of n-Hexadecane on Tetralin and Benzene Metastable Droplets in Surfactant-Free Conditions

Influence of Surfactant on the Thermal Behavior of Marigold Oil Emulsions with Liquid Crystal Phases

Prediction of the Amount of Ice Formation in the Water Dispersed Phase of a W/O Emulsion

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