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Articles about surface and interface tension and liquid foam research
Articles about surface and interface tension and liquid foam research


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Are you working on #foams, #emulsions, #bubbles, or #drops phenomena?
This convention is for you! Moreover, it is taking place in the nice, sunny city of Lyon capital of gastronomy! Want to participate, exhibit, or sponsor the event? Click here to get more info:

“Bubble & Drop” is a scientific convention which gathers together scientists, academic community, and industrial world around emulsion and foam research.
Conferences, scientific posters, industrial applications, all drops and bubbles aspects will rhythm the week to inspire, reveal, and make scientific research grow.
Bubble & Drop is the scientific congress reference in Europe which brings together between 250 to 300 people.

In 2017, Life Sciences will especially be in the spotlight: health, nutrition, personal and home care, environment…

Come and join us to enhance your knowledge on those issues and share your innovative developments!
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Recommended publication: "Breaking oil-in-water emulsions stabilized by yeast"

Elsevier: Colloids and Surfaces B: Biointerfaces
Volume 128, 1 April 2015, Pages 568–576 2015
Guilherme F. Furtado a, Carolina S.F. Picone a, b, Maria C. Cuellar c, Rosiane L. Cunha a,

a. Department of Food Engineering, School of Food Engineering, University of Campinas, Campinas 13083-970, SP, Brazil
b. School of Technology, University of Campinas, Limeira 13484-332, SP, Brazil
c. Department of Biotechnology, Delft University of Technology, Julianalaan 67 Delft, 2628BC, The Netherlands.

Several biotechnological processes can show an undesirable formation of #emulsions making difficult phase separation and
product recovery. The breakup of oil-in-water emulsions stabilized by yeast was studied using different physical and
chemical methods.

Equipment: #Drop #Tensiometer Tracker
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Des données quantitatives et qualitatives pour valider un composant, un ingrédient, un additif, un #tensioactif / #surfactant...

La tension superficielle est une force existant au niveau de la surface entre un liquide et un gaz et la tension d'interface se mesure entre deux liquides. 
Les molécules à la surface préférant être entourées par leurs congénères, le système tend à minimiser la surface de contact entre les deux milieux. 
Ce phénomène permet d’expliquer par exemple la forme sphérique des bulles de savon, la forme bombée de la surface d’un verre d’eau un peu trop rempli, 
la forme des gouttes qui tombent du robinet … 

Cette force peut être modifiée par des molécules que l’on appelle agents de surface ou tensioactifs qui réduisent l’énergie à la surface entre ces deux milieux. 
Ces molécules sont amphiphiles, c’est-à-dire qu’elles présentent une double affinité avec une partie lipophile (miscible dans les corps gras) apolaire et une partie 
hydrophile (miscible dans l’eau) polaire. 

Pour mesurer la tension superficielle ou d'interface, il existe différentes méthodes (De Nouÿ, Wilhelmy …) dont celle de la goutte montante ou pendante qui 
permet une mesure précise de la tension en fonction du temps et qui donne accès à des informations complémentaires sur les tensioactifs.

Pour en savoir plus sur le #tensiomètre à goutte :
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Understanding foaming phenomenon is a major challenge for both academic and industrial
Indeed, foam has exceptional properties in various fields such as
food-processing industry, cosmetics, petrochemicals etc ...

To better understand foam, different scales should be analyzed from molecular to foam volume.
Foam volumes already allow to measure properties such as
structure, drainage speed, stability...

For a finer study of destabilization phenomenon, 3D foam gives us
only some part of information.

One way to understand those phenomena is to analyze foam cells
structure, including cell size, distribution, film size and
evolution of foam over time. 2D foam can allow access to these data.

A two-dimension foam is a foam which is created between two glass plates
whose spherical radius is larger than the space of the two plates.

Thanks to this type of apparatus, we can analyze foam structure more
precisely. Access to parameters previously set is facilitated.
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"From Sources to Solution" book: Evaluation of #foam #stability in decontamination foam, chapter 85 - page 477
Foamscan Instrument by Teclis used for tests.
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