Kinetics of ice nucleation in aqueous emulsions

Clausse, Danièle; Babin, L.; Broto, F.; Aguerd, M.; Clausse, Marc

doi:10.1021/j100244a005

Cited by 37 publications

(21 citation statements)

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“…Nevertheless, ice crystallization still tended to occur at temperatures in the range of -9 to -30 C depending upon the heptacosanol concentration in the microemulsion droplets (Liu et al, 2007), i.e. much higher than the homogeneous nucleation temperature of -40 C (Wood & Walton, 1970;Clausse et al, 1983). For ionic surfactants, like AOT, heterogeneous nucleation in microemulsions can also occur.…”

Section: Measurement Of the Critical Nucleus Size In Microemulsionsmentioning

confidence: 99%

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Crystallization in Microemulsions: A Generic Route to Thermodynamic Control and the Estimation of Critical Nucleus Size

Cooper¹,

Cook²,

Loines³

2012

Crystallization - Science and Technology

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Section: Measurement Of the Critical Nucleus Size In Microemulsionsmentioning

confidence: 99%

“…Note though that nucleation is a stochastic process, so repeated experiments will show some slight variation but an expected homogeneous nucleation temperature should nevertheless be apparent. For instance, the homogeneous nucleation temperature for ice is -40 C (Wood & Walton, 1970;Clausse et al, 1983).…”

Section: Crystallization From the Meltmentioning

confidence: 99%

Crystallization in Microemulsions: A Generic Route to Thermodynamic Control and the Estimation of Critical Nucleus Size

Cooper¹,

Cook²,

Loines³

2012

Crystallization - Science and Technology

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“…Another temperature has been introduced more for commodity reasons than for theoretical ones linked to the experimental procedure used to study a great number of droplets as it is the case in an emulsion. This temperature has been referred in the literature as the most probable freezing temperature T* [60,61,[74][75][76].…”

Section: Solidification Of a Single Samplementioning

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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“…With the help of the J(r) functions [3] and [4] and of Eq. [12], upon performing the integrations in [6] and [8] we obtain …”

Section: Polydisperse Emulsionmentioning

confidence: 99%

“…Since in practice emulsions are polydisperse, i.e. they consist of droplets of various sizes, there is a need of a theory which, in line with Turnbull's (8) and later (11,12) studies, describes more comprehensively the kinetics of crystallization in emulsions by allowing explicitly for the size distribution of the emulsion droplets. This distribution can be expected to have an effect when it is sufficiently wide, because then, due to the dependence of the nucleation rate on the droplet size, the larger droplets will crystallize considerably more rapidly than the smaller ones.…”

Section: Introductionmentioning

confidence: 99%