HLB – Alternative concepts / Arjan Gelissen in SOFW JOURNAL, Vol. 146, N° 12 (12/2020)  

[article]  inSOFW JOURNAL > Vol. 146, N° 12 (12/2020) . - p. 24-28 Titre : HLB – Alternative concepts Type de document : texte imprimé Auteurs : Arjan Gelissen, Auteur ; Renke Rommerskirchen, Auteur ; Joachim Venzmer, Auteur Année de publication : 2020 Article en page(s) : p. 24-28 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Emulsions Equilibre hydrophile-lipophile Inversion de phase (chimie) Microémulsions Surfactants Index. décimale : 660.2 Génie chimique Résumé : Alternative classification concepts of emulsifiers have to cope with HLB’s main flaw, which is assigning a single, “universal”, calculated number to an emulsifier, as discussed in our previous paper. For emulsions, the influence of the oil phase needs to be considered as well as temperature, pH or salinity. Both alternatives to HLB discussed here make use of a thermodynamic equilibrium state as a reference – in case of oil/water/surfactant this means a microemulsion. The Hydrophilic-Lipophilic Deviation (HLD) describes the deviation of an entire formulation of water, oil, and a surfactant from the optimum, balanced reference state. From this the characteristic curvature (Cc) of surfactants can be determined, which is a number that describes their hydrophilicity or hydrophobicity. In contrast, the PIT-slope method characterizes the hydrophilicity/hydrophobicity of a surfactant in relation to C10E4 in an octane/water system; therefore, it is also able to capture all effects of molecular structure of the surfactant. Note de contenu : - Basics – Emulsions and microemulsions - HLD - PIT-slope - Table 1 : General differences between (macro-)emulsions andmicroemulsions - Fig. 1 : Idealized fish diagram of oil/water/surfactant to explain the formation of microemulsions - Fig. 2 : Optimum salinity of di-hexyl sulfosuccinate sodium salt with varying EACN at 25°C En ligne : https://drive.google.com/file/d/1aqygJ7v---6UJbl2KRfLgg3Fbk3GJFAu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35005 [article]

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