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Surface Chemistry
Rating: 4.1 out of 5(6 ratings)
258 students

Surface Chemistry

Adsorption, Colloidal Solution and Catalysis
Created byVinay Arya
Last updated 4/2019
English

What you'll learn

  • Surface Phenomenon, Adsorption, Absorption, Adsorbate, Adsorbent,Physical Adsorption and Chemical Adsorption

Course content

1 section • 9 lectures • 2h 3m total length

  • Introduction10:10

    Introduction to surface chemistry covers adsorption vs absorption, adsorption applications in pollution control, and the properties and types of colloids, solutions, and suspensions for modern equipment and daily life.

  • Adsorption14:44

    Explore surface chemistry through adsorption and absorption at interfaces, distinguishing physical and chemical adsorption, understanding activation energy, surface area effects, and real-world examples.

  • Application of Adsorption12:38

    Explore how adsorption underpins everyday solutions, from activated charcoal in gas masks and humidity control with silicone gel to pigment decolorization and chromatography, highlighting practical applications of adsorption.

  • Colloidal Solutions13:42

    Explore the classification of mixtures in surface chemistry, including true solutions, colloidal solutions, and suspensions defined by particle size and dispersion.

  • Preparation of Colloidal Solutions14:58

    Learn how to prepare colloidal solutions through condensation and chemical methods, understand stabilization and precipitation processes, and explore mechanical and electrical dispersion to form stable suspensions.

  • Properties of Colloidal Solutions13:46

    Explore the properties of colloidal solutions, including Brownian movement, scattering, and coagulation, and learn dialysis and centrifugation as separation methods, plus osmotic pressure and boiling point elevation, freezing point depression.

  • Applications of Colloidal Solutions12:22

    Explore the industrial and daily life applications of colloidal solutions, including water purification by coagulation and electrostatic precipitation, photography, latex, leather finishing, paints, lubricants, and rubber products.

  • Coagulation, Gold number and Emulsions18:24

    Explore coagulation mechanisms, the gold number concept, and emulsions in surface chemistry, including how electrolytes, stabilizers, and protective agents influence precipitation and particle stability.

  • Catalysis12:59

    Explore surface chemistry and catalysis, comparing homogeneous and heterogeneous catalysts and how they alter reaction rate and selectivity by adsorption and surface mechanisms.

  • Innovation

Requirements

  • Be able to judge Absorption

Description

Many chemical reactions take place at the surfaces of solids, e.g., at the surface of solid catalysts. Corrosion of metals takes place at their surfaces. Surface means the topmost layer on the very exterior of a solid. Now-a-days, there are ways of studying the top 0.5 to 2 nm, i.e., two to five of the topmost layers of atoms of the solid surface.

Adsorption. The existence of a substance at a surface in different concentration than in the adjoining bulk is called adsorption. It is selective absorption.

Absorption. It is the phenomenon in which a substance is uniformly distributed all over the surface.

Adsorbent. The substance present in bulk, on the surface of which adsorption is taking place is called adsorbent.

Adsorbate. The substance which is being adsorbed on the surface of another substance is called adsorbate.

Desorption. The process of removing an adsorbed substance from a surface on which it is adsorbed is called desorption.

Physical adsorption or physisorption. If the adsorbate is held on a surface of adsorbent by weak Vander Waal's forces, the adsorption is called physical adsorption or physisorption.

Chemical adsorption or chemisorption. If the forces holding the adsorbate are as strong as in chemical bonds, the absorption process is known as chemical adsorption or chemisorption.

Enthalpy or heat of adsorption. Adsorption generally occurs with release in energy, i.e., it is exothermic in nature.

Who this course is for:

  • Beginners, 12 grade students and research Scholars

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