Small Angle X-ray Scattering Laboratory

Phone : +91-3222-283178

Location : OB / FF / 6, CRF

Facilitator : Prof. Narayan Chandra  Das, Rubber Technology Center
Email: ncdas@rtc.iitkgp.ac.in, Contact:+91-3222-283190



Objectives

Fundamental Principles of SAXS:

SAXS makes the use of x-ray scattering toward low angle (typically less than 10 degree). Since this angular range contains information about sample's inhomogeneities (i.e., electron density difference) in size ranging from ~5 to ~150 nm, SAXS can provide structural information (i.e., size, size distribution and shape) of macromolecules of repeat distances in partially ordered systems up to ~150 nm whose dimensions are on the same order as the X-ray wavelength.

People

Prof. Narayan Chandra  Das
Facilitator
Rubber Technology Center
ncdas@rtc.iitkgp.ac.in
+91-3222-283190
Mr. Souvik Das
Technical Staff
Central Research Facility
sd_dass89@rediffmail.com

Equipment Details

Small Angle X-Ray Scattering (SAXS)

Manufacturer : XENOCS S.A. France, Xenocs SAS - Headquarters

38360 Sassenage, France

Instrument Details :

X-ray Source : 30 Watts Cu tube with 50 KV  0.6mA current

Optics  : Single reflection multilayer parabolic mirror.

Slits  : Single crystal scatter less slits ( S1, S2)

Detector  : Single photon counting Hybrid pixel on-line  

detector Pilatus 300K from Dectries.

Automation : SpecFE based software to control motors slits, etc.

Data Acquisition : Foxtrot

Analysis Software : Sasfit from Synchtron Granobel.

Purchase source : H P I Services, India

Year of installation  : 2015

Utility and Working Principal

Image result for small angle X-ray scattering

It works on the principle of Braggs Law.

nλ=2d sinθ, where:

  • λisthe wavelength of the x-ray,
  • disthe spacing of the crystal layers (path difference),
  • θis the incident angle (the angle between incident ray and the scatter plane), and
  • nisan integer


Sample Details

The samples can be solid or liquid and they can contain solid, liquid or gaseous domains (so-called particles) of the same or another material. The applications include a wide variety of samples such as colloids, metal particles, ceramic particles, polymers, proteins and pharmaceuticals in the form of power, gel, thin film, solution, etc.



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