Dynamic Light Scattering (DLS)

  Instrument Details  
Make & Model : Malvern Zetasizer, Zeta nano ZS90
Temperature control range : 0˚C to 90˚C
Standard laser : 633nm
Size Specifications:
Range (Max diameter) : 0.3nm - 5microns
Min sample volume : 20μL
Max concentration : Dilute
Measurement angles : 13° + 90°
Zeta Potential Specifications:
Zeta potential range : > +/-500mV
Min sample volume : 20μL
Max concentration : 40% w/v
Maximum sample conductivity : 200mS/cm




  Working Principles   

         This is an entry level system for the measurement of particle size at a 90 degree scattering angle using Dynamic Light Scattering, also with the ability to measure zeta potential and molecular weight using Static Light Scattering.

The principle of dynamic light scattering is that fine particles and molecules that are in constant random thermal motion, called Brownian motion, diffuse at a speed related to their size, smaller particles diffusing faster than larger particles. To measure the diffusion speed, the speckle pattern produced by illuminating the particles with a laser is observed. The scattering intensity at a specific angle will fluctuate with time, and this is detected using a sensitive avalanche photodiode detector (APD). The intensity changes are analyzed with a digital autocorrelator which generates a correlation function. This curve can be analyzed to give the size and the size distribution.


  Applications   

     Size measurement from 0.3nm (diameter) to 5 microns using 90 degree scattering optics
     Zeta potential of colloids and nanoparticles using patented M3-PALS technology
     Molecular weight measurement down to 9,800 Da
     Automation of measurements using an autotitrator option
     Temperature range extension option to 120°C

  Contact Person   

        Dr. Sachin Tyagi
         Contact: +91-172-2642545         
Email Id : sachintyagi.iitr@gmail.com



 Charges with GST Extra  

Size measurement and Zeta potential measurementRs. 450per sample