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CHARACTERISATION TOOL FOR BIOMATERIALS
SCANNING ELECTRON MICROSCOPE
GAUTAM KKS
Electron Microscopy
High Voltage Unit
Online UPS
Chillar Unit
• mean free path of electrons v short in air
- at least 10 -5 mbar usually aimed for
• also
- tungsten filaments burn out in air
- columns must be kept dust free
• achieved by 2-fold pumping:
rotary (mechanical) pump + diffusion pump
or + turbo pump
why high vacuum ?
Rotary Pump
how does a diffusion pump work?
Defusion Pump
Sputter Unit
Gold Plate
the electromagnetic lens
(SEM) and TEM
ANT
ANT EYE
ANT LEG
TEFLON TAPE
FIBERS
FRACTURED 1
FRACTURED 2
AL CU MICROSTRUCTURE
NANOPARTICLES
WEARED SURFACE
WEARED SURFACE 2