Mass Transfers Within Emulsions Studied by Differential Scanning Calorimetry (DSC) - Application to Composition Ripening and Solid Ripening

Clausse, Danièle; Drelich, Audrey; Fouconnier, Benoît

doi:10.5772/20279

Cited by 2 publications

(2 citation statements)

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“…SPAN80 is a lipophilic surfactant (HLB = 4.3) consisting mainly of sorbitan monooleate . The properties of water in contact with organic liquids containing SPAN80 were mostly investigated to describe interfacial rheology and emulsion stability. ,− Important activity has also been devoted to such mixtures in the field of liquid surfactant membranes that find important applications in extraction for recovery (resp. separation) of valuable (resp.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Microstructure Formation at Water/Paraffin Oil Interfaces

et al. 2017

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An experimental investigation of spontaneous emulsification is proposed with a water drop pendant in a paraffin oil (PO) solution loaded with a surfactant (SPAN80). Optical microscopy in a transmission mode is employed for high-spatial-resolution image recording. The kinetics of spontaneous emulsification is studied. It is shown to generate a darkening of the drops because of interface modification with a characteristic time that depends upon the SPAN80 concentration. For low concentrations, spontaneous emulsification is slow and produces micrometer-sized droplets, whereas for large concentrations, it is fast and bush-like microstructures are observed. These microstructures increase in size and progressively invade the complete water/PO interfaces, detach, and finally migrate into the PO phase. This transport phenomenon withdraws water from the drops and leads to a gradual shrinking of their volume. At the end of this process, they appear as deformed objects surrounded by a loose membrane.

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Section: Introductionmentioning

confidence: 99%

Spontaneous Microstructure Formation at Water/Paraffin Oil Interfaces

et al. 2017

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“…They have been also considered as systems showing liquid membranes, but easier for controlling stability, and as a possible way to control the droplets size [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57]. They are obtained by gentle mixing, in order to avoid coalescence between droplets, of two simple emulsions containing droplets of different composition.…”

Section: Introductionmentioning

confidence: 99%

Freezing Within Emulsions: Theoretical Aspects and Engineering Applications

Clausse

Dalmazzone

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Conge´lation dans les e´mulsions : aspects the´oriques et applications techniques -Cet article se concentre principalement sur le comportement a`la conge´lation des e´mulsions qui sont conside´re´es soit comme des syste`mes permettant d'obtenir des informations sur les mate´riaux en surfusion, soit comme des syste`mes disperse´s complexes implique´s dans les proce´de´s industriels. En raison du fait qu'il existe une phase disperse´e sous forme de fines gouttelettes dans les e´mulsions, des retards a`la solidification sont observe´s et les gouttelettes de liquide persistent meˆme en dessous du point de fusion du mate´riau. La corre´lation entre la tempe´rature de solidification des gouttelettes et leur taille peut eˆtre donc utilise´e pour suivre l'e´volution de la morphologie de l'e´mulsion en fonction du temps aussi bien sur terre que dans des conditions de microgravite´(projet FASES soutenu par l'ESA). Une description de ces phe´nome`nes observe´s principalement par microcalorime´trie sera donne´e pour des corps purs disperse´s ainsi que pour des solutions disperse´es. Dans certains cas, les e´mulsions peuvent eˆtre recherche´es pour leurs proprie´te´s spe´cifiques, telles que la grande taille de l'interface huile/eau, conduisant a`des transferts de masse ame´liore´s; les e´mulsions peuvent eˆtre par conse´quent utilise´es comme des membranes liquides pour l'extraction, le stockage et la libe´ration controˆle´e de matie`res actives. Dans d'autres cas, la formation d'e´mulsions a un effet ne´faste sur les proce´de´s, comme dans l'industrie pe´trolie`re ou`des e´mulsions eau-dans-pe´trole tre`s stables se forment facilement et compliquent l'ope´ration de de´shydratation du pe´trole brut.Abstract -Freezing Within Emulsions: Theoretical Aspects and Engineering Applications -This article is mainly focused on the freezing behaviour of emulsions which will be considered either as systems permitting to get information about undercooled materials or as complex dispersed systems involved in industrial processes. Due to the fact that there exists a phase dispersed as tiny droplets in emulsions, solidification delays are observed and liquid droplets are still observed under the melting points of pure materials. The correlation between the solidification temperature of the droplets and their size may be therefore used to follow the evolution of the emulsion morphology versus time on ground as in microgravity conditions (FASES project supported by ESA). A description of these phenomena mainly observed through microcalorimetry experiments will be given for dispersed pure materials as for dispersed solutions. In some cases, emulsions may be sought after for their specific properties, such as their large oil/ water interface, leading to enhanced mass transfers; emulsions may be consequently used as liquid membranes for extraction, storage and controlled release of active materials. In other cases, the formation of emulsions has a detrimental effect on the process. It is the case in the oil industry where very stable w...

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Mass Transfers Within Emulsions Studied by Differential Scanning Calorimetry (DSC) - Application to Composition Ripening and Solid Ripening

Cited by 2 publications

References 60 publications

Spontaneous Microstructure Formation at Water/Paraffin Oil Interfaces

Spontaneous Microstructure Formation at Water/Paraffin Oil Interfaces

Freezing Within Emulsions: Theoretical Aspects and Engineering Applications

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