Question
Collect information about surface chemistry.
✓
Answer
- Surface or interface represents the boundary which separates two bulk phases.
e.g. Boundary between water and its vapour is a liquid-gas interface. - Certain properties of substances, particularly of solids and liquids, depend upon the nature of the surface.
- An interface usually has a thickness of a few molecules. However, its area depends on the size of the bulk phase particles.
- Commonly considered bulk phases may be pure compounds or solutions.
- A number of important phenomena, namely, dissolution, crystallization, heterogeneous catalysis, electrode processes and corrosion take place at an interface.
- Thus, study of chemistry of surfaces is critical to many applications in industry, analytical investigations and day-to-day activities such as cleaning and softening of water.
- The branch of chemistry which deals with the nature of surfaces and changes occurring on the surfaces is called surface chemistry.
- Study of surfaces requires a rigorously clean surface. An ultra-clean metal surface can be obtained under very high vacuum, of the order of $10^{-8}$ to $10^{-9}$ pascal.
- Adsorption, catalysis and colloids (such as emulsions and gels) are some of the important aspects of surface chemistry.
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