briefly describe an experiment arrangement for observing scattering of light in colloidal solution.

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Solution

$T h e s c a t t e r i n g o f l i g h t f r o m c o l l o i d a l s u s p e n s i o n i s b e i n g d o n e u \sin g a t e c h n i q u e c a l l e d " D y n a m i c l i g h t s c a t t e r i n g " o r D L S . I n t h i s m e t h o d u \sin g a f o c u s e d l a s e r l i n e, d e t e c t o r d e t e c t s t h e s c a t t e r i n g i n t e n s i t i e s f r o m c o l l o i d s a t d i f f e r e n t i n s \tan c e o f t i m e a n d f i n a l l y c o r r e l a t e t e h i n t e n s i t y f l u c t u a t i o n s (a s I (t) = I_{0} \pm δ I) w i t h r e s p e c t t o t i m e i n t e r v a l s . t h i s i s b e i n g c a l c u l a e t d u \sin g a u t o c o r r e l a t i o n f u n c t i o n c a l l e d g_{2} (τ) = \frac{< I (t) I (t + τ) >_{t}}{< I (t) >^{2}} f r o m t h e a u t o c o r r e a l t i o n w e c a n f i n d c h a r a c t e r i s t i c d y n a m i c a l d e c a y t i m e o f t h e s y s t e m w h i c h i n d e e d p r o v i d e s o m e i n h e r e n t m i c r o r h e o \log i c a l p r o p e r i e s l i k e v i s c o e l a s t i c m o d u l u s, m e a n s q u a r e d i s p l a c e m e n t e t c a f t e r f u r t h e r n u m e r i c a l p r o c e s \sin g .$

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