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Optical properties12

Physical pharmaceutics -II

Chandrashekhar3
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Optical properties12

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  1. Subject :- Information Of Optical Properties Presented by :- Disha Mahendra Kursunge Guided by :- Badwaik Sir

  2. OPTICAL PROPERTIES OPTICAL PROPERTIES It is use to identify the size , shape, Molecular weight of particles.

  3. ➢ THERE ARE THE FIVE TYPES OF THE OPTICAL PROPERTIES 1. Tyndall Effect 2. Ultramicroscopy 3. Electron microscope 4. Turbidity 5. Ordinary Light Microscope

  4. Tyndall Effect :- Tyndall in 1969 Observed That When Strong Beam of light pass through a true solution. In cannot be see unless Observed through the path of light. When it is assed through a colloidal dispersion The path of light become iluminate.When the same Beam of light is passed through colloidal solution They Become (show) Visible &This is the phenomenon is called faraday Tindall Effect. Lyophobic System show Most intense Tyndall Effect. Lyophilic system show little or no effect

  5. 2. Ultramicroscopy :- The colloidal particle an too small to be seen with an optical microscope. Optical Microscopy when a cell containing a colloidal dispersion. Viewed through an ultramicroscope against a dark background. At right angle to intense beam of light. The particle appear or bright spots against the dark background. The actual particle are not seen as they are very small but the light scatted by them equation be seen..

  6. 3. Electron microscopic It was first developed in germany (1932) by - James Albert Prebus.V.K Zworkying of us made Notable contribution to its development. Ultramicroscope are sometimes not able to recive some lyophilic colloids so electron microscopes are used. Electron microscopic which is not limited by the power of optical lenses of light, but permits Grather Magnification & grether Depth of focous than optical microscope The electron microscope works on the principle that the smaller is the wavelength of incident Grather is the resolution Power. Ultramicroscope are sometimes not able to resolve Lyophilic Colloids so electronic microscope are used. Electron microscope is usefull in getting picture of actual particle so they help size/shape. also structure of colloidal particles. E.g. :- Microbes like viruses & Bacteria. Magnification Order 1000.

  7. 4. Turbidity Colloidal dispersion show Turbidity according to molecular weight of colloids of spectrophotometer are used to find out. Turbidity increases then Increases in molecular weight.

  8. 5. Ordinary Light Microscope Ordanary Light Microscope uses Visible light as it's it sources of radiation resolve particles separates by a distance 1800 Å or more (limitation) only large colloidal particles size range are resolved (determination) and also use in observing all size colloidal particles.

  9. Thank you………..

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