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Colloid is a term that has come to encompass solid particles suspended in a liquid (a colloidal dispersion), microscopic droplets in a liquid (an emulsion), or either solid or liquid phases suspended in a gas (an aerosol). 1.2 Gallery of colloids. Fig. 1.1 is a gallery of colloidal particles that have been used in our laboratory, including:
Freshly prepared ferric hydroxide, aluminium hydroxide and arsenic sulphide sols are examples of lyophobic sols. A few methods of preparation of colloids are – chemical methods, electrical disintegration and peptization. In this unit you will learn to prepare both the types of sols. Also, you will learn a method of purification of sols.
27 Σεπ 2022 · Familiar examples of colloids include mayonnaise, milk, fog, smoke, and gelatin. A gel is a colloid of solid particles in a liquid medium. A sol consists of liquid particles in a solid medium. An emulsion is a colloid formed by two or more liquids. A foam forms by gas particles trapped within a liquid or solid.
13 Νοε 2022 · Define: surfactant, detergent, emulsifier, micelle. Give some examples of how colloidal dispersions can be made. Explain why freezing or addition of an electrolyte can result in the coagulation of an emulsion.
Learning Objectives. By the end of this section, you will be able to: Describe the composition and properties of colloidal dispersions. List and explain several technological applications of colloids.
Colloids may involve virtually any combination of physical states (gas in liquid, liquid in solid, solid in gas, etc.), as illustrated by the examples of colloidal systems given in Table 11.4. Examples of Colloidal Systems. Table 11.4. Preparation of Colloidal Systems.
12 Αυγ 2019 · Science ›. Chemistry. Colloid Examples in Chemistry. Examples of Colloids and How to Tell Them From Solutions and Suspensions. PLAINVIEW, Getty Images. By. Anne Marie Helmenstine, Ph.D. Updated on August 12, 2019. Colloids are uniform mixtures that don't separate or settle out.
