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[3: Discusses elementary theory of liquid crystal states and the use of liquid crystals in practical display devices. Includes models of nematic, smectic and cholesteric phases, discusses devices using...
Two video sequences showing a series of demonstrations of experimental techniques which include: continuous extractions; flash chromatography; reduced-pressure distillation; small-scale recrystallisation and...
An introduction to crystals with a discussion of new research developments.*
Recorded in a laboratory in University College, London. Discusses the various techniques and procedures that are used to prepare pure organic compounds. Organic reactions and product recovery are seen from...
Introduction to crystal structures. Shows how the regularity of the external appearance of a crystal (interfacial angles, cleavage planes) reflects its internal order. Illustrated with examples of the...
Looks at the way a molecular structure can build up through the repeated unit cell into a crystal lattice. Explains the main types of bonding which produce different types of crystal structure. Also...
Summary of the optical properties of anisotropic solid crystals. Bi-refringence of liquid crystals and transition of the isotropic state. Study in parallel and convergent polarized light of plates of nematic...
Early use of crystals; working principles of the germanium diode and the transistor; applications and advantages.
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