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Books > Professional & Technical > Mechanical engineering & materials > Materials science
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Soft Matter Physics (Paperback, Softcover reprint of the original 1st ed. 1999)
Loot Price: R2,723
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Soft Matter Physics (Paperback, Softcover reprint of the original 1st ed. 1999)
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In a liquid crystal watch, the molecules contained within a thin
film of the screen are reorientated each second by extremely weak
electrical signals. Here is a fine example of soft matter:
molecular systems giving a strong response to a very weak command
signal. They can be found almost everywhere. Soft magnetic
materials used in transformers exhibit a strong magnetic moment
under the action of a weak magnetic field. Take a completely
different domain: gelatin, formed from col lagen fibres dissolved
in hot water. When we cool below 37 DegreesC, gelation occurs, the
chains joining up at various points to form a loose and highly
deformable network. This is a natural example of soft matter. Going
further, rather than consider a whole network, we could take a
single chain of flexible polymer, such as polyoxyethylene [POE =
(CH CH O)N, 2 2 5 where N rv 10 ], for example, in water. Such a
chain is fragile and may break under flow. Even though hydrodynamic
forces are very weak on the molecular scale, their cumulated effect
may be significant. Think of a rope pulled from both ends by two
groups of children. Even if each girl and boy cannot pull very
hard, the rope can be broken when there are enough children
pulling.
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