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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).
Colloids and Surface Chemistry. • Simplest: tiny particles dispersed in water. What is a colloid? Finely-divided dispersion of one phase in another. Size of dispersed (“solute-like”) entity >> ordinary molecules. Example: blood cell in water. Solution. homogeneous particles are molecules. Colloid. size 1–1000 nm. particles remain suspended.
General Instructions: 1. There are 36 questions in this paper. 2. Marks are indicated against each question. 3. Q 24 to Q 36 are based on practical skills. 4. All questions are compulsory.
27 Σεπ 2022 · Colloids are classified as foams, aerosols, emulsions, gels, or sols, depending on the nature of the dispersed phase and dispersion medium. Familiar examples of colloids include mayonnaise, milk, fog, smoke, and gelatin. A gel is a colloid of solid particles in a liquid medium.
4 Οκτ 2023 · First, we describe the synthesis of colloidal samples and techniques for characterizing particle concentration, particle size, and surface charge number. Next, we will show how to prepare various colloidal crystals described in Chap. 2. Some practical tips will also be presented.
13 Νοε 2022 · Explain why freezing or addition of an electrolyte can result in the coagulation of an emulsion. Describe some of the colloid-related principles involved in food chemistry, such as the stabilization of milk and mayonaisse, the preparation of butter, and the various ways of cooking eggs.
Describe the composition and properties of colloidal dispersions. List and explain several technological applications of colloids. As a child, you may have made suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water, known as tempera paint.
