DOCSLIB.ORG

The Life of an Anise-Flavored Alcoholic Beverage: Does Its Stability Cloud Or Confirm Theory?

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Life of an Anise-Flavored Alcoholic Beverage: Does Its Stability Cloud Or Confirm Theory? Langmuir 2008, 24, 1701-1706 1701 The Life of an Anise-Flavored Alcoholic Beverage: Does Its Stability Cloud or Confirm Theory? Elke Scholten,†,§ Erik van der Linden,*,† and Herve This‡ Food Physics Group, Department of Agrotechnology and Food Sciences, Wageningen UniVersity, Bomenweg 2, 6703 HD Wageningen, The Netherlands, and INRA Group of Molecular Gastronomy, Laboratory of Chemistry, UMR 214 INRA/AgroParisTech, 16 rue Claude Bernard, 75005 Paris, France ReceiVed July 19, 2007. In Final Form: NoVember 6, 2007 The well-known alcoholic beverage Pastis becomes turbid when mixed with water due to the poor solubility of trans-anethol, the anise-flavored component of Pastis in the water solution formed. This destabilization appears as the formation of micrometer-sized droplets that only very slowly grow in size, thus expanding the life of the anise- flavored beverage. The slow growth has been attributed to an extremely low interfacial tension of the droplets. Fitting experimental droplet growth rates to an Ostwald ripening model, interfacial tensions were deduced in the past. Direct determination of the interfacial tensions was not yet reported on these systems. We have measured the interfacial tensions and used these data to predict droplet growth rates using an Ostwald ripening model and a model for creaming of the droplets. The interfacial tension was measured to be about 11 mN/m for a 30/70 w/w % ethanol/water mixture, and it decreases slightly to a value of 1.4 mN/m in the case of a 70/30 w/w % ethanol/water mixture. These values are not as low as those deduced in the past. The theoretical predictions for both the Ostwald ripening rates and the creaming rates, using the directly measured interfacial tensions, are found to contradict with the experimental results on Ostwald ripening and creaming. While the experiments on Ostwald ripening show an increase in stability with increasing ethanol concentration, the results based on our interfacial tension measurements in combination with the same Ostwald ripening model show a decrease in stability with an increase in ethanol concentration. Further research is needed to understand fully which parameters play a role in both droplet growth and the stability of these three- component emulsions to elucidate the current discrepancy between model and experiment. This could be useful for a better control of “spontaneous emulsification” processes. 1. Introduction causes the oil droplets to form in the solution due to the supersaturation of the oil. The tremendous decrease in solubility In Mediterranean countries, anise-flavored alcoholic beverages due to the addition of water causes a very large supersaturation, are frequently consumed. These beverages include, for example, so that many nuclei form from small fluctuations in concentration. Pastis, Pernod, Ricard (in France), Ouzo (in Greece), Raki (in Although the amount of oil is small, it results in the appearance Turkey), and Sambuca (in Italy). All appear transparent when of a large number of small droplets, since the initial rate of bottled, with an ethanol content around 40% (v/v). Many nucleation is extremely large. These droplets are of the order of manufacturers offer advice to drink this Pastis-like beverage the size of 1 µm or less. Due to the many droplets in the solution, (PLB) with the addition of water (dilution of about 5 times), after visible light gets multiply scattered within the solution, and the which the drink spontaneously changes into an opaque, milky resulting diffusive motion of the light makes the solution to white solution. This phenomenon is known as the Pastis effect1 2,3 appear milky white. The systems created by addition of water or Ouzo effect. Some research has been performed on this to PLBs can therefore be regarded as emulsions, where the oil beverage to gain insight into this physical phenomenon. When is distributed as small droplets in another liquid. However, there bottled, PLBs are three-component homogeneous solutions is a distinct difference between most food emulsions and the composed of water (about 55%), alcohol (about 45%), and “oil” emulsions created by the addition of water to PLBs. The first (about 0.1%). This “oil” consists mainly of trans-anethol, which difference is that most food emulsions are stabilized (indeed it is an ester with a very specific odor that gives its unique anise is only metastability) by one or more surfactants that migrate smell to these beverages. Anethol is soluble in ethanol but toward the water/oil interface, whereas the emulsion formed extremely insoluble in water (calculated log P of 2.91). When from PLBs does not contain an emulsifier. The second difference bottled, the ratio between the ethanol, water, and oil is chosen is that, to make normal emulsions with droplet sizes of the order in such a way that the oil is still soluble in the mixture, so the of 1 µm, energy (e.g., mechanical energy such as in homog- mixture appears transparent. However, when the alcoholic enization) is required to compensate for the important increase beverage is poured into water, the oil is no longer soluble. This in surface energy (about 1 J for a 100 mL drink). However, the emulsification process of the PLB mixing with water does not * To whom correspondence should be addressed. E-mail: erik. require the addition of any form of mechanical energy. Therefore, [email protected]. † Wageningen University. this process is called “spontaneous emulsification”. It is nowadays ‡ UMR 214 INRA/AgroParisTech. frequently used for the production of nanocapsules and nano- § Current affiliation: Massachusetts Institute of Technology, Department particles,4,5 which makes it possible to create particles smaller of Chemical Engineering, 77 Massachusetts Avenue, Cambridge, Mas- than those created with conventional methods, such as solvent sachusetts 02139. (1) Grillo, I. Colloids Surf., A 2003, 225, 153-160. (2) Vitale, S. A.; Katz, J. L. Langmuir 2003, 19, 4105-4110. (4) Ganachaud, F.; Katz, J. L. ChemPhysChem 2005, 6, 209-216. (3) Sitnikova, N. L.; Sprik, R.; Wegdam, G.; Eiser, E. Langmuir 2005, 21, (5) Bouchemal, K.; Briancon, S.; Perrier, E.; Fessi, H.; Bonnet, I.; Zydowicz, 7083-7089. N. Int. J. Pharm. 2004, 269,89-100. 10.1021/la702186g CCC: $40.75 © 2008 American Chemical Society Published on Web 01/24/2008 1702 Langmuir, Vol. 24, No. 5, 2008 Scholten et al. evaporation techniques. This technique can also be used to create the continuous phase is also at its saturation level. To saturate the small nanospheres, liposomes, and vesicles.4 ethanol/water mixtures, we added an excess of trans-anethol to the Measurements performed with various techniques, such as solution. The mixtures were then heated up to 35 °C, 10 °C above small angle light scattering, small angle neutron scattering, the desired temperature of the experiments, to increase the solubility of the oil into the mixtures. This ensured full saturation of the mixtures electrical resistance, and dynamic light scattering, mostly show ° 1,2,3,6 when the temperature was lowered down to 25 C. The excess trans- that the droplet diameters are of the order of 1 µm, though anethol was centrifuged down, as the density of the used ethanol/ some experiments even show that the size of the droplets can water mixtures was lower than that of the oil. The oil-saturated 6 be as small as 200 nm. This is rather small, as no mechanical mixtures were then poured into a cuvette. A millimeter-sized droplet agitation is used. Several experiments have followed the increase of trans-anethol was inserted in the ethanol/water mixtures using a of the size of the droplets with time. Although the size appears syringe, equipped with a needle, and its size was determined by the to increase slightly in the beginning, it stabilizes after a few software. Since ethanol is soluble in the oil droplets, little diffusion hours; PLB-based emulsions can then stay stable for days, weeks, of ethanol into the droplets was expected. We therefore measured or even months. The initial size of the droplets and the droplet the volume of the droplet and the interfacial tension in time. As the size obtained after stabilization depend on the ethanol/water ratio volume of the droplets (and the interfacial tension) did not change and the amount of oil present in the system. Experiments1,3 also significantly during time, we assumed the system to be in equilibrium. Since the size of the droplet did not change, we assumed the density indicated that the growth of the droplets immediately after of the oil droplet to be unchanged and constant throughout the time nucleation of the oil is obtained via a process called Ostwald span of the experiment. The droplet size and its shape were then ripening rather than through droplet coalescence. Both coales- used to calculate the interfacial tension with the use of the density cence and Ostwald ripening can be studied by monitoring the difference between the trans-anethol and the ethanol/water mixtures. droplet size with time. Droplet growth via coalescence occurs In practice, the ethanol/water mixtures were poured into a sample due to the merging of two or multiple droplets, and the volume holder of a few milliliters. A syringe with a curved needle was of the droplets increases exponentially in time. The growth of inserted into the mixture. The end of the needle was facing up so the droplets due to Ostwald ripening does not depend on the that the droplets were placed on top of the needle. Using a needle merging of droplets but rather by the diffusive transport of the facing upward prevents the droplets from falling down, and gives dissolved oil through the medium, and this process is characterized the droplet a more oblate spheroid shape rather than a prolate spheroid by a linear droplet growth in time.
Load more

Recommended publications
  • Nanoparticles and Nanocapsules Created Using the Ouzo Effect
    Nanoparticles and Nanocapsules Created Using the Ouzo Effect: Spontaneous Emulsification as an Alternative to Ultrasonic and High-Shear Devices FranÅois Ganachaud*[a] and Joseph L. Katz[b] The preparation of polymeric particles and capsules by means of solvent and a hydrophobic oil—and optionally some water— spontaneous droplet formation and subsequent polymer precipi- thus generating long-lived small droplets, which are formed even tation or synthesis is well-known. However, spontaneous emulsifi- though no surfactant is present. Herein, we review and reinter- cation is a phenomenon that has often been erroneously inter- pret the most relevant publications on the synthesis of a variety preted. This Minireview provides new insights into the prepara- of dispersions (pseudolatexes, silicone emulsions, biodegradable tion of metastable liquid dispersions by homogeneous liquid– polymeric nanocapsules, etc.), which we believe have actually liquid nucleation, and is based primarily on a recent study by been synthesized using the Ouzo effect. The Ouzo effect may also Vitale and Katz (Langmuir, 2003, 19, 4105–4110). This spontane- become a substitute for high-shear techniques, which, to date, ous emulsification, which they named the Ouzo effect, occurs have only been of limited utility on industrial scales. upon pouring, into water, a mixture of a totally water-miscible 1. Introduction Well-known aperitifs (Ouzo in Greece, Pastis in France, etc.) are in the phase diagram of these mixtures there is a region, be- ethanol extracts of anis seeds. Upon dilution with water, such tween the spinodal and the binodal curves, where a metasta- extracts, whose major components are water, ethanol, and the ble dispersion can be generated (Figure 2).
    [Show full text]
  • A Toast to Dynamic NMR Spectroscopy: Towards a Better Comprehension of Palatable Emulsions
    VOL. 21 NO. 5 (2009) AARTICLERTICLE A toast to dynamic NMR spectroscopy: towards a better comprehension of palatable emulsions David Carteau, Isabelle Pianet and Dario M. Bassani Institut des Sciences Moléculaires, CNRS UMR 5255, Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence France. E-mail: [email protected] Introduction and aniseed. One of the most intriguing cules that are in different environments.5 Memories of summer vacations on the properties of t-A, however, is its capabil- In many occurrences, however, the NMR Mediterranean would not be complete ity to undergo spontaneous emulsifica- spectra of emulsions are not very inform- without recollections of the refresh- tion upon rapid dilution of a concentrated ative due to inhomogeneous line-broad- ing anise-flavoured alcoholic beverages solution with a miscible but non-solubilis- ening of the signals. Surprisingly, this is served during the hot afternoons. Though ing solvent. This phenomenon, for which not the case for emulsions of t-A in water, varying in name and composition across the term “ouzo effect” has been coined though, as convincingly shown in Figure cultures (Raki in Turkey, Arak in Lebanon, by some authors,2 is responsible for the 1. The sharp and clearly distinguishable Ouzo in Greece, Sambuca in Italy and cloudy aspect of the above-mentioned signals are attributed to t-A located in Pastis in France), extracts from star anis beverages as the alcohol content of the different environments: a moderately (Illicium floridanum) are a common prin- hydro-alcoholic solution is dropped from polar aromatic environment within the cipal ingredient of the plant extracts used above 40% to ca 5% v/v and affects the aggregates, and a hydrophilic aqueous in their production.
    [Show full text]
  • 3-D Silk Fibroin Porous Particles Created by the Ouzo Effect for Biomedical Applications
    UNLV Theses, Dissertations, Professional Papers, and Capstones 5-1-2020 3-D Silk Fibroin Porous Particles Created by the Ouzo Effect for Biomedical Applications Ashley Nicole Lamb Follow this and additional works at: https://digitalscholarship.unlv.edu/thesesdissertations Part of the Biomechanical Engineering Commons, Biomedical Commons, and the Biomedical Devices and Instrumentation Commons Repository Citation Lamb, Ashley Nicole, "3-D Silk Fibroin Porous Particles Created by the Ouzo Effect for Biomedical Applications" (2020). UNLV Theses, Dissertations, Professional Papers, and Capstones. 3914. http://dx.doi.org/10.34917/19412108 This Thesis is protected by copyright and/or related rights. It has been brought to you by Digital Scholarship@UNLV with permission from the rights-holder(s). You are free to use this Thesis in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s) directly, unless additional rights are indicated by a Creative Commons license in the record and/ or on the work itself. This Thesis has been accepted for inclusion in UNLV Theses, Dissertations, Professional Papers, and Capstones by an authorized administrator of Digital Scholarship@UNLV. For more information, please contact [email protected]. 3-D SILK FIBROIN POROUS PARTICLES CREATED BY THE OUZO EFFECT FOR BIOMEDICAL APPLICATIONS By Ashley Lamb Bachelor of Science in Engineering – Mechanical Engineering University of Nevada, Las Vegas 2018
    [Show full text]
  • Small-Angle Neutron Scattering Study of a World-Wide Known Emulsion: Le Pastis
    Colloids and Surfaces A: Physicochem. Eng. Aspects 225 (2003) 153Á/160 www.elsevier.com/locate/colsurfa Small-angle neutron scattering study of a world-wide known emulsion: Le Pastis Isabelle Grillo Institut Laue-Langevin, Large Scale Structures, 6 rue Jules Horowitz, B.P. 156, 38042 Grenoble Cedex 9, France Received 20 February 2003; accepted 12 June 2003 Abstract ‘Pastis’ is a famous aniseed based beverage, symbolic of hot summer days in the south of France. But who really knows the origin of the milky color when adding water? Each time you drink a glass of ‘Pastis’, you observe a complex phenomenon in physical chemistry! Pastis is mainly composed of anethol, an aromatic molecule, water, ethanol and additive compounds that improve the taste. Anethol has a very low solubility in water and further addition of water to the ‘dry’ preparation induces the formation of an emulsion made of large anethol droplets in a water-plus-ethanol solvent that scatter light. The origin of the spontaneous formation of the emulsion is a well-known phenomenon, which appears in liquid systems with three or more compounds, when the sample composition is trapped between the binodal and spinodal curves on the phase diagram. The radius of the droplets has been determined using the small-angle neutron scattering technique (D22, Institut Laue-Langevin, Grenoble). Of the order of a micron, the droplet size depends on the anethol/ethanol volume ratio and grows with time and temperature. # 2003 Elsevier Science B.V. All rights reserved. Keywords: Anethol; Spontaneous emulsion; Small-angle neutron scattering; Porod’s law 1.
    [Show full text]
  • Methods and Techniques
    This doctoral thesis was made out at the Institute of Physical and Theoretical Chemistry, University of Regensburg, between November 2012 and October 2015 and under the supervision of Prof. Dr. Werner Kunz. I would like to thank many people for their help and support throughout these years. First of all, I would like to thank Prof. Dr. Werner Kunz for welcoming me and giving me the opportunity to prepare my thesis at his institute. Thank you for the numerous ideas, advices and discussions and for the time you invested to follow my work. Thank you also for this interesting topic that I had the chance to present at many conferences. I also express my gratitude to Dr. Didier Touraud for his great help, his availability and his amazing ideas. Thank you for all the corrections and advices regarding the publications, and for taking the time to discuss any subject with me. Merci! I deeply thank Prof. Dr. Thomas Zemb and Dr. Olivier Diat at the Institut de Chimie Séparative de Marcoule, France, for their help, explanations and guidance regarding the small- and wide- angle x-ray scattering and the small-angle neutron scattering techniques. Many thanks for the interest you gave to my work. Thanks to PD Dr. Rainer Müller and Prof. Dr. Richard Buchner for letting me use their equipment. Special thanks to Rosi and Sonja for their help, their kindness, and their good mood every day! I would like to thank all my colleagues for all the scientific help and especially for the fantastic atmosphere at the institute.
    [Show full text]
  • Physrevfluids.4.100502
    PHYSICAL REVIEW FLUIDS 4, 100502 (2019) Gallery of Fluid Motion Shaky life of a water drop in an anise oil-rich environment Óscar R. Enríquez ,1,* Daniel Robles,2 Pablo Peñas-López,3 and Javier Rodríguez-Rodríguez1 1Fluid Mechanics Group, Carlos III University of Madrid, 28911 Leganés, Madrid, Spain 2Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, México DF, México 3Physics of Fluids Group, University of Twente, Enschede, The Netherlands (Received 4 February 2019; published 24 October 2019) This paper is associated with a video winner of a 2018 APS/DFD Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2018. GFM.V0054 DOI: 10.1103/PhysRevFluids.4.100502 We illustrate the rich physical phenomena that can arise in certain kinds of three-liquid mixtures. In this particular case, we use anethole (anise oil), ethanol, and water. The situation can be humorously compared to a “love triangle” enacted by fluids: anethole and ethanol are miscible (they “love” each other), and so are water and ethanol; however, water and anethole are only sparingly soluble (they “hate” each other). Put the three together, and ... The best-known example of this type of mix is termed the ouzo effect and is seen upon adding water to anise-based alcoholic drinks (ouzo, pastis, raki, anís, arak, absinthe, etc.), which triggers the emulsification of anise oil, giving these drinks their characteristic milky aspect. However, this is interesting not only for enjoying drinks but also in exploring spontaneous solvent separation processes, the formation of nanodroplets, microemulsions, and more.
    [Show full text]
  • Menu Bev Book 10:16
    Beverages See Main Menu for New, Seasonal, & Specials ! Custom Pairings, Tastings & Bar Services for groups or individually by appointment, as well as Events for all of our Beverages. Inquiries @ our Front Desk. Striving to offer the finest beverage selection @ the best value ! Please leave a request at the Front Desk should you wish for an item not listed ! Not all items are stocked at our bars, some are in the basement & will take a moment to provide. Due to limited production, changing distribution, acts of God, Etc. - all items may be limited. Pricing may change w/out notice. Product info listed is derived directly from the bottle or the manufacturer’s website. Proof, ABV, & such listed right after products name. General Info courtesy of the free web ! Abiding by all NYS Liquor Authority Rules, Regulations pertinent to service under our License, as well as common sense, & reserving the right to refuse service to anyone for any reason - for over 30 Years. Please enjoy responsibly ! “Spirits are a wonderful servant but a terrible master”. Thank You for your Patronage ! !!!INDEX ! !1 - 12!BEER ASK SERVER FOR DRAFT CHOICES - SEE MAIN MENU FOR NEW BEERS !!14!HARD CIDERS & PERRIES !!15!MEADS & BRAGGOTS ! !16-17!SODA!H2O!SYRUPS!JUICE !!18!COFFEE!ESPRESSO!CAPPUCINO!+ SPIRITS !!19!TEA!SEASONAL !!20!SPARKLING !!21!FROZEN & 16 OZ CLASSIC / NEW !!22!COCKTAILS !!23!AROMATIZED WINE & APERITIFS ! !24-25!DIGESTIFS, AMARI, HERBALS !!26!ABSINTHE & PASTIS ! !27-29!LIQUEURS, CORDIALS & CREME LIQUEURS !30-32!VODKA !!33!GIN !!34!RUM ! !35-36!TEQUILA & MEZCAL ! !36-37!GRAPPA & EAU-DE-VIE ! !37-38!ARMAGNAC, COGNAC !!39!BRANDY !40-42!SHERRY & MADEIRA !!43!DESSERT WINE !44-47!PORT !!48!WHISKEY & WHISKY !49-51!AMERICAN BOURBON ! !52-53!AMERICAN STRAIGHT RYE !!54!AMERICAN, TENNESSEE, & CANADIAN !!55! IRISH & SINGLE MALT !!56!BLENDED SCOTCH ! !57-59!SINGLE MALT SCOTCH !!!BEERS Serving temps of beer influence’s the drinking experience.
    [Show full text]
  • How to Explain Microemulsions Formed by Solvent Mixtures Without Conventional Surfactants
    How to explain microemulsions formed by solvent mixtures without conventional surfactants Thomas N. Zemba,1, Michael Klossekb, Tobias Lopiana,b, Julien Marcusb, Sebastian Schöettlb, Dominik Horinekb, Sylvain F. Prevostc, Didier Touraudb, Olivier Diata, Stjepan Marceljaˇ d, and Werner Kunza,b,1 aICSM (Institut de Chimie Séparative de Marcoule), UMR 5257 (Commissariat a l’energie atomique et aux energies alternatives/CNRS/Ecole Nationale Supérieure de Chimie de Montpellier, Université de Montpellier), 30207 Bagnols sur Cèze, France; bInstitut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany; cEuropean Synchrotron Radiation Facility (ESRF), 38043 Grenoble, CEDEX 9, France; and dDepartment of Applied Mathematics, Research School of Physics & Engineering, Australian National University, Canberra, ACT 0200, Australia Edited by Monica Olvera de la Cruz, Northwestern University, Evanston, IL, and approved February 26, 2016 (received for review August 7, 2015) Ternary solutions containing one hydrotrope (such as ethanol) and enough to get a macroscopically homogeneous, stable, transparent two immiscible fluids, both being soluble in the hydrotrope at any one-phase system. Surprisingly, these one-phase systems are struc- proportion, show unexpected solubilization power and allow strange tured as revealed by combined X-ray and neutron scattering (2). In but yet unexplained membrane enzyme activity. We study the system analogy to the Ouzo effect, which is related to relatively stable fine ethanol-water-octanol as a simple model of such kinds of ternary emulsions without surfactants, we named the unexpected structur- solutions. The stability of “detergentless” micelles or microemulsions in ing in these monophasic systems the pre-Ouzo effect, emphasizing such mixtures was proposed in the pioneering works of Barden and that it occurs before the system is diluted with so much water that it coworkers [Smith GD, Donelan CE, Barden RE (1977) J Colloid Interface phase-separates (9).
    [Show full text]
  • Thesis Submitted in Candidature for the Degree of Doctor of Philosophy
    University of Bath PHD Phase inversion temperature emulsification: from batch to continuous process Marino, Helene Award date: 2010 Awarding institution: University of Bath Link to publication Alternative formats If you require this document in an alternative format, please contact: [email protected] General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Download date: 11. Oct. 2021 Phase Inversion Temperature Emulsification: From Batch to Continuous Process Helene Marino A thesis submitted in candidature for the degree of Doctor of Philosophy University of Bath Department of Chemical Engineering April 2010 Copyright: Attention is drawn to the fact that copyright of this thesis rests with its author. A copy of this thesis has been supplied on condition that anyone who consults it is understood to recognise that its copyright rests with the author and they must not copy it or use material from it except as permitted by law or with the consent of the author.
    [Show full text]
  • S41567-019-0639-9.Pdf
    research highlights EXOPLANETS of rock, their expected radii are also BIOMIMETICS Star companions similar to Earth’s radius — they might The best of both eyes Astron. Astrophys. 627, A49 (2019) even be habitable. SR Adv. Funct. Mater. 29, 1903340 (2019) https://doi.org/10.1038/s41567-019-0639-9 Naturally evolved eyes have their strengths and weaknesses. Compound eyes allow insects FLUID DYNAMICS to see over a wide range of angles, but the Love–hate liquids fixed focal length limits resolution and depth Phys. Rev. Fluids (in the press) perception. Vertebrate eyes, on the other hand, are varifocal but have a small field of view. The ‘ouzo effect’ refers to the stable Zhuo-Chen Ma and colleagues have combined microemulsion that forms when the two principles and made an artificial anise-based liqueur is mixed with water. compound lens with variable focal length. And it can be understood as something The lens comprises approximately 80 of a love triangle: the anethole and individual facets arranged in a hexagonal ethanol in ouzo are miscible, and ethanol pattern — similar to a dragonfly eye — and was fabricated from the protein bovine serum Credit: NASA/Walt Feimer plays well with water, but the third pairing is antagonistic, resulting in albumin using direct laser lithography. The that familiar milky emulsion. Oscar protein reacts to a change in the pH value of When we gaze at the northern celestial Enríquez and colleagues have captured its environment by swelling or shrinking and hemisphere, we might observe a few stars of the dynamics of a water droplet therefore with a change of focus and of the the Aries constellation.
    [Show full text]
  • Surfactant Free Microemulsions: Possible Applications for Solubilisation and Extraction of Hydrophobic Components
    Surfactant free microemulsions: possible applications for solubilisation and extraction of hydrophobic components Jurko, Lucija Master's thesis / Diplomski rad 2017 Degree Grantor / Ustanova koja je dodijelila akademski / stručni stupanj: University of Split, Faculty of Chemistry and Technology / Sveučilište u Splitu, Kemijsko-tehnološki fakultet Permanent link / Trajna poveznica: https://urn.nsk.hr/urn:nbn:hr:167:147644 Rights / Prava: In copyright Download date / Datum preuzimanja: 2021-10-01 Repository / Repozitorij: Repository of the Faculty of chemistry and technology - University of Split UNIVERSITY OF SPLIT FACULTY OF CHEMISTRY AND TECHNOLOGY SURFACTANT-FREE MICROEMULSIONS: POSSIBLE APPLICATIONS FOR SOLUBILISATION AND EXTRACTION OF HYDROPHOBIC COMPONENTS DIPLOMA THESIS Lucija Jurko Parent number: 58 Split, October 2017. UNIVERSITY OF SPLIT FACULTY OF CHEMISTRY AND TECHNOLOGY Graduate study of Chemistry Orientation: Organic Chemistry and Biochemistry SURFACTANT-FREE MICROEMULSIONS: POSSIBLE APPLICATIONS FOR SOLUBILISATION AND EXTRACTION OF HYDROPHOBIC COMPONENTS DIPLOMA THESIS Lucija Jurko Parent number: 58 Split, October 2017. SVEUČILIŠTE U SPLITU KEMIJSKO-TEHNOLOŠKI FAKULTET Diplomski studij Kemija Smjer: Organska kemija i biokemija MIKROEMULZIJE BEZ PRISUTNOSTI SURFAKTANTA: MOGUĆE PRIMJENE ZA OTAPANJE I EKSTRAKCIJU HIDROFOBNIH KOMPONENATA DIPLOMSKI RAD Lucija Jurko Matični broj: 58 Split, listopad BASIC DOCUMENTATION CARD DIPLOMA THESIS University of Split Faculty of Chemistry and Technology Split Graduate study of Chemistry Scientific area: Natural Sciences Scientific field: Chemistry Thesis subject was approved by Faculty Council of Faculty of Chemistry and Technology, session no 21. Mentor: Vesna Sokol, PhD, Associate professor Technical assistance: Sebastian Krickl, M. Sc. Surfactant-free microemulsions: possible applications for solubilisation and extraction of hydrophobic components Lucija Jurko, 58 Abstract: This work deals with surfactant-free microemulsions (SFME) and is composed of two parts.
    [Show full text]
  • Examining the Temperature Dependence of Louche Formation in Absinthe
    Cleveland State University EngagedScholarship@CSU Physics Faculty Publications Physics Department 7-2021 Examining the Temperature Dependence of Louche Formation in Absinthe Jessica E. Bickel Cleveland State University, [email protected] Anna Ellis Cleveland State Univesity Andrew Resnick Cleveland State University, [email protected] Follow this and additional works at: https://engagedscholarship.csuohio.edu/sciphysics_facpub Part of the Physics Commons How does access to this work benefit ou?y Let us know! Repository Citation Bickel, Jessica E.; Ellis, Anna; and Resnick, Andrew, "Examining the Temperature Dependence of Louche Formation in Absinthe" (2021). Physics Faculty Publications. 432. https://engagedscholarship.csuohio.edu/sciphysics_facpub/432 This Article is brought to you for free and open access by the Physics Department at EngagedScholarship@CSU. It has been accepted for inclusion in Physics Faculty Publications by an authorized administrator of EngagedScholarship@CSU. For more information, please contact [email protected]. http://pubs.acs.org/journal/acsodf Article Examining the Temperature Dependence of Louche Formation in Absinthe Jessica E. Bickel,* Anna Ellis, and Andrew Resnick Cite This: ACS Omega 2021, 6, 17674−17679 Read Online ACCESS Metrics & More Article Recommendations ABSTRACT: Absinthe is an anise-flavored alcohol that is typically served by adding cold water to form a cloudy green louche, similar to the cloudy white louche of ouzo. This microemulsion formation, due to the competing interactions within the oil−alcohol−water system, has been termed the ouzo effect. Previous work has examined the ternary oil−alcohol−water phase diagram in ouzo and limoncello. Additional work has also characterized the droplet size and stability of microemulsions in ouzo, limoncello, and pastis.
    [Show full text]