This emulsion is generally formed if the aqueous phase constitutes more than 45 % of the total weight and a hydrophilic emulsifier is used. The emulsion are generally prepared by shaking strongly the mixture of two colloids these emulsions are generally unstable. Rated best chemistry notes for high school chemistry, ap chemistry, college chemistry and general chemistry courses. A stable emulsion will have polydisperse droplets vmd of 5 and 20.
Chapter 11 emulsion breaking an emulsion is an intimate mixture of two liquid phases, such as oil and water, in which the liquids are mutually insoluble and where either phase may be dispersed in the other. Class 12 notes edurev is a part of the class 12 course chemistry class 12. Depending upon the nature of the dispersed phase, the emulsions are classified as. Mechanism, types, uses, emulsifying agents, videos. Bulk polymerizationpolymer chemistryengineering chemistry. Basic chemistry up to class x level is asked in competitive exams such as indian railways alp and group d exams and ssc exams. Tadros is a very well recognized individual in the surface chemistry community and is known to write. The term emulsion is also applied to a group of mixed systems called as solutions, or gels or suspensions. Emulsions are part of a more general class of twophase systems of matter called colloids. Emulsion chemistry gl lifi hil ttgeneral emulsifier chemical structures salt formation surface activity of emulsifiers. Milk oil in water emulsion is on the edge of colloidal stability. The emulsion in which oil is present as the dispersed phase and water as the dispersion medium continuous phase is called an oilinwater emulsion.
Pdf emulsion and emulsification technology researchgate. It should be noted that a certain concentration of sur. An emulsion is a colloidal dispersion in which both the dispersed phase and the dispersion medium are liquids. In other words, an emulsion is a special type of mixture made by combining two liquids that normally dont mix.
For wo emulsion, pit of 10400c lower than the storage temperature is desired. To accomplish surface studies meticulously, it becomes imperative to have a really clean surface. Apr 06, 2020 emulsions and their properties class 12 notes. For wo emulsion, the orientation of the emulsifier would be the opposite as that of ow. Emulsion chemistry emulsion composition and performance. Pdf emulsion is one of the most common products in our lives and used to. Surface chemistry class 12 notes pdf download inorganic. An emulsion is a mixture of two or more liquids that are normally immiscible unmixable or unblendable. Ppt emulsion chemistry powerpoint presentation free to. The uses of emulsions are found in several chemical, energy, and. Do if possible, use warm water for dilution and always add the water slowly to the emulsion not the emulsion to the water. Examples of emulsions include mayonnaise, milk, lotions, etc.
This phenomenon of attracting and retaining the molecules of a substance by a solid or a liquid on its surface resulting into a higher concentration of the molecules on the surface is known as adsorption. Emulsion, types, oilinwater, waterinoil, chemistry study. Emulsion polymerization an overview sciencedirect topics. These are referred for oral administration and cosmetics. Surface chemistry class 12 notes chemistry chapter 5 learn cbse. Emulsion meaning, types of emulsion, properties, examples byjus. Class 12 chemistry revision notes for chapter 5 surface. These notes are preliminary and may contain errors. This document is highly rated by class 12 students and has been viewed 291 times. The polymerization is initiated by free radicals arising from the addition of an initiator soluble or partially in the aqueous phase.
If you continue browsing the site, you agree to the use of cookies on this website. Milk is an emulsion of fat and water, along with several other components. Class 12 chemistry surface chemistry all topic notes cbse class 12 chemistry all chapters notes. Chemistry notes chapters 17 and 18 water and aqueous systems solutions goals.
Note, the shear stress is the product of shear rate and viscosity and hence it. Brief overview there are two basic classes of bituminous materials. An emulsion is a colloid in which both the dispersed phase and the dispersal medium are liquids. Emulsions can be oil in water emulsion or water in oil emulsion. Periodic table, periodic table with groups, conversion factors, conversion flashcards. The viscosity of an emulsion is correlated with the starting oil, however there exists high variation in this factor. Chemistry notes class xii as per cbse ncert books chapter wisenotes pdf board level. A good lubricating oil should form such an emulsion with water which breaks easily. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both phases, dispersed and continuous, are liquids. But what exactly are these emulsions and what is their significance in our daily lives as well as their applicability in industries. Chemistry notes chapters 17 and 18 water and aqueous. Cbse ncert notes class 12 chemistry surface chemistry. Emulsions like water and oil separate into two layers and make the emulsion unstable. A stable emulsion will have polydisperse droplets vmd of 5 and 20 microns, whereas an unstable emulsion will not.
Emulsion is a dispersion in which the dispersed phase is composed of small globules of a liquid. Emulsion a colloid which contains one liquid in another in which it is not soluble or miscible. These videos can be used in a flipped classroom model or as. Basic emulsion chemistry aema asphalt emulsion technologies workshop november 14, 2011 andrew bickford asphalt innovations meadwestvaco. Common examples of emulsions include egg yolk, butter, and mayonnaise. Emulsion polymerization in practice is a very simple process, consisting of a reaction system in which the monomers are stabilized via the use of surfactants and are dispersed in an aqueous phase. The chemical structure of surfactant consists of hydrophilic and lipophilic groups. An emulsion is a colloid of two or more immiscible liquids where one liquid contains a dispersion of the other liquids. Osmotic pressure with vant hoff factor, colloids, tyndall effect, brownian motion, aerosol, foam, emulsion. Unit 1 pdf notes, step by step significant figures without highlighting, step by step conversions without highlighting. Jan 31, 2020 an emulsion is a colloid of two or more immiscible liquids where one liquid contains a dispersion of the other liquids. The characteristic red colour of an emulsion appears to be related to this polydispersability.
Emulsions are formed from the component liquids either spontaneously or, more often, by mechanical means. Although the terms colloid and emulsion are sometimes used interchangeably, the term emulsion is used only when both the phases are in a liquid state. Colloids, classification of colloids, physical state of dispersed phase and dispersion. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. A suspension of microscopic liquid drops within another liquid.
Emulsions and their properties class 12 notes edurev. Apr 17, 2020 emulsions and their properties class 12 notes edurev is made by best teachers of class 12. For ow emulsion, emulsifier should yield pit of 20600c higher than the storage temperature. Solutions homogeneous colloids heterogeneous suspensions heterogeneous. Emulsion is a dispersion in which the dispersed phase is composed of.
Types of solutions, expression of concentration of solutions of solids in liquids, solubility of gases in liquids, solid solutions, colligative properties relative lowering of vapour pressure, raoults law, elevation of boiling point, depression of freezing point, osmotic pressure, determination of molecular masses using colligative properties, abnormal molecular mass, vant hoff factor. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Cbse ncert notes for class 12 chemistry surface chemistry. Under very high vacuum of the order of 108 to 109 pascal, it is now possible to obtain ultra clean surface of the metals. The accumulation of molecular species at the surface rather than in. Jun 26, 2019 surface chemistry class 12 notes chemistry chapter 5. Qualitatively we can describe three types of solutions. Emulsion, in physical chemistry, mixture of two or more liquids in which one is present as droplets, of microscopic or ultramicroscopic size, distributed throughout the other. These materials are generally used as waterproofing sealants, and as a binder to hold aggregate together in bituminous pavements.
One of the most widely used methods of manufacturing vinyl polymers, emulsion polymerization involves formation of a stable emulsion often referred to as a latex of monomer in water using a soap or detergent as the emulsifying agent. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Apr 22, 2019 colloidal state of matters colloidal state of matter is, a state in which the size of the particles is such 1 to nm that they can pass through the filter paper but not through animal or vegetable membrane. In water chemistry, two types of emulsions are commonly found, oily wastewater oil emulsified in water or ow emulsions and waste oil. The drop sizes vary, so this mixture is not homogeneous, and therefore not a solution. The accumulation of molecular species at the surface rather than in the bulk of a solid or liquid. Surface chemistry class 12 notes chemistry mycbseguide. Emulsion is a dispersed system in which the phases include immiscible or partially miscible liquids, such as milk and rubber latex. Mackay and novak 1984, mackay, 1984 studied emulsions and found that stable emulsions had low conductivity and therefore a continuous phase of oil. Emulsions notes free download as powerpoint presentation. Large surface area to volume ratio size appropriate for scattering light. In this set of notes we will discuss the differences between these two.
Milk is an example of the oilinwater type of emulsion. Aug 23, 2015 anna university engineering chemistry 1 cy6151 notes unit1 polymer chemistry polymerization techniques bulk polymerization. Igcse chemistry handwritten notes combined sciences a level biology. In an emulsion, one liquid contains a dispersion of the other liquid. Class 12 chemistry revision notes for chapter 5 surface chemistry free pdf download. Find materials for this course in the pages linked along the left. The substance a thus added to stabilize the emulsions are called emulsifiers or emulsifying agents. Do avoid repeated pumping and recycling, if possible, as the viscosity may drop and air may become entrained, causing the. These chemistry lecture notes can be used as a chemistry study guide, since all major chemistry topics are covered. Emulsion meaning, types of emulsion, properties, examples. Ow, wo nonionic surfactants surfactant mixtures micellar emulsions microemulsions ionic surfactants macroemulsions. Solutions, colloids, and suspensions there are 3 categories for mixtures with water. If an emulsion is prepared by homogenizing two pure liquid components, phase separation will generally be rapid, especially if the concentration of the dispersed phase is at all high. Chemistry help, through chemistry notes for ap chemistry, high school chemistry, college chemistry and general chemistry courses, is provided.
Emulsification a noun and emulsify verb mean the process of forming an emulsion. The subject of surface chemistry finds many applications in industry, analytical work and daily life situations. An emulsion is termed an oilwater ow emulsion if the. Solutions homogeneous colloids heterogeneous suspensions heterogeneous homogeneous aqueous systems aqueous solution a water solution containing dissolved substances solvent the dissolving medium the substance that does the dissolving. Surface chemistry class 12 inorganic formulas notes pdf download. Cbse class 12th chemistry chapter 5 surface chemistry important notes are available. The process of mixing liquids to form an emulsion is called emulsification. Surface chemistry class 12 notes chemistry chapter 5. Chemistry notes for class 12 chapter 5 surface chemistry surface chemistry is the branch of chemistry which deals with the phenomenon that occurs on the surfaces or interfaces, such phenomenon includes corrosion. Some other examples of emulsions include butter which is an emulsion of water in fat and egg yolk containing lecithin. An emulsion is a mixture of two or more liquids that are normally immiscible unmixable or.
Lecture notes synthesis of polymers chemical engineering. These studies show that the droplet size of water in emulsions may be related to stability. To get fastest exam alerts and government job alerts in india, join our telegram channel. Surface chemistry class 12 notes pdf download inorganic formulas. Animated emulsion polymerisation polymer chemistry. The word emulsion comes from the latin word meaning to milk milk is one example of an emulsion of fat and water. Soap is an emulsifying agent which acts as a bridge to hold the oil and water together to form an emulsion. Did you know that the word emulsion is derived from the latin word mulgeo which means to milk.
The fuse school is currently running the chemistry journey project a chemistry education project by the fuse school sponsored by fuse. Emulsion formation and stability wiley online books. For example oil and water are not miscible will not dissolve in each other. An emulsion is a type of colloid formed by combining two liquids that normally dont mix. Illustrated glossary of organic chemistry emulsion.
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