|Technique:||Small Angle X-ray Scattering (SAXS), Wide Angle X-ray Scattering (WAXS)|
|Applications:||Nano structural investigation of materials, Nano particle size analyses|
|Radiation source :||Multipole wiggler|
|Photon flux at sample:||~2e9 phs/s|
|Photon energy range:||6-9 keV (optimized at 9 keV)|
|Beam size @ sample:
||2x1 mm (HxV)|
|Beam collimation:||3 slits + 1 guard slit|
|Monochromator type:||Double Multilayer Monochromator (W/B4C)|
|Focusing element||Toroidal mirror|
|Detectors:||CCD (Rayonix SX165, LX170HS)
|Sample-detector distance:||140 - 4500 mm (WAXS/SAXS modes)|
|Minimum q:||0.06 nm-1|
|Measurable characteristic length:||~ 1 - 100 nm|
|Sample type:||Powder / solid / liquid / fiber|
|Sample environment:||In air|
Sample is attached to a sample stage and the measurement is performed in air. A metal frame with square aperture of 10x10 mm is availble as the sample holder for solid and powder sample. A sample cell with aperture of 4x10 mm and the thickness 1.5 mm is available for liquid sample. The amount of liquid sample required for each measurement is 60 micro litre. Kapton film is used as the window for the sample cell.
Heating / Cooling stage
A heating/cooling stage is available to perform in situ measurements. The temperature can be varied between 15 to 200 C.
Tensile / Heating / Cooling stage
A tensile stage with force up to 500 N is available for in situ tensile experiment. The tensile stage can also heat the sample to the temperature 100 C.
Sample-detector distance calibration
Silver behenate is available on site as calibration standard for SAXS measurements. 4-Bromo Benzoic acid and other standards, such as TiO2 are available for WAXS calibration. Other standard such as rat-tail tendon, if needed, will have to be brought by users.
Image processing program such as FIT2D (http://www.esrf.eu/computing/scientific/FIT2D/) can be used to process the measured 2D scattering patterns for further analyses.
A Matlab-based data processing program called SAXSIT which is developed in-house is also available to process the 2D scattering pattern. The program can do, for example, pattern masking, pattern alignment, circular averaging, data merging and a few other things including some simple fitting and modeling. The program SAXSIT is available for download below.
Each measured pattern file is about 8 MB and each experiment usually takes a lot of patterns. Users are therefore recommended to bring DVDs or an external hard disk to save the data to take back home.
Example of measured patterns
Collagen fiber in rat tail tendon
4-Bromo Benzoic acid
Rubber wood (measurement of Micro Fibril Angle)
BL1.3W Station Manual
The manual for BL1.3W contains details of the instruments, sample preparation, measurement procedure, etc. The manual also contains SAXS principles and some details on data reduction and analyses. The station manual can be downloaded below (BL1.3W SAXS/WAXS Station manual).
The program SAXSIT has been developed by BL1.3W : SAXS team for processing of scattering patterns, data manipulation and some fitting and modeling. The code is written on Matlab and compiled to executable. The code can be run without Matlab. However, the Matlab Runtime Library (MCRInstaller.exe) will have to be run once on the computer. The code is available for Windows 64 bit and can be downloaded below.
The current version (as of Nov 2018) is SAXSIT4.41. Here are things it can do:
- Pattern alignment (using standard with circular scattering pattern)
- Sample-detector distance calibration (using standard with known period size)
- Background subtraction of patterns
- Pattern median masking
- Circular averaging (to obtain 1D scattering profile as a function of 2theta or q)
- Automated data processing to automatically process multiple patterns with the same setup (such as patterns from the same sample at different temperature)
- Radial integration (to obtain 1D profile as a function of azimuthal angle)
- Calculation of Hermans orientation factor
- Guinier and Porod fits (to obtain radii of gyration or slope)
- Profile smoothing
- Data merging
- Normalization of data sets by area under curve
- Peak search
- Nano particle size and size distribution fitting
- Rod + Debye-Bueche model fitting
- Core-shell with sticky hard sphere model fitting
- Paracrystalline model fitting
- Peak function fitting (Pseudo Voigt and Pearson VII)
- A few other things
After downloading the files, please unzip and follow the procedure in readme_HowToInstall_SAXSIT.txt to install the program.
|Dr. Siriwat Soontaranon : siriwat|
|Dr. Nuntaporn kamonsutthipaijit : nuntaporn|
|Dr. Sirinart Srichan : sirinart|
|Ms. Chonthicha Keawhan : chonthicha|