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Question 4 ( i ) Why does a liquid crystalline fluid appear cloudy, but when heated sufficiently appears transparent? 2 0 % ( ii )
Question
i Why does a liquid crystalline fluid appear cloudy, but when heated sufficiently
appears transparent?
ii When a supersaturated solution of aluminium and copper is aged, metastable pre
cipitates such as or form first, rather than the equilibrium Explain
why this happens. Why is the solubility of copper in aluminium larger when in
equilibrium with a metastable precipitate?
iii Derive an equation that relates solidification velocity to the activation barrier
for the transfer of atoms from liquid to solid and the magnitude of the driving force
for solidification,
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