In XRD results for porous boron-carbon samples I've got a huge signal (11 000 arb. units) for small angle at 2theta=2.7. I know that this signal can indicate the preaense of small particles or small pores. Where I can find more explanation about diffractograms of porous solids? I would like to get more explanation in that field.
Thank you for you help.
the broadness of the FWHM of the peaks is the indication of porous nature. Also the peak intensity being less can be attribute to the porous natute of the sample. An xrd spectrum where all additional peaks to the characteristic peak almost disappear and there exist one peak with extreamely lare FWHM, the sample is amorphius in nature.
The once declared porous sample on inreasing temperature improves its intensity peaks in XRD along with the reduction in the width of FWHM
Change in FWHM will help you to study pore size . Read the attached papers.
The porosity measures by Porosimeter devices. While XRD used of the determination of phases formation and development.
Regards
Dr. G.A. Khater
most of the time the broadness of the FWHM of the peaks is the indication of porous nature Change in FWHM will help you to study pore size
for more information you can web this site it will help you alot
https://materialsproject.org/
I think so,
If the starting peak is higher than 8 or 9° then this implies small pore, but if it is in-between 6 to 7 medium pore, 5 to 6 could be large pore, and 5 to 5.5 very large pore etc. I hope this helps
XRD use use in the determination of phase identification but porosity determine by Porosimeter device
Regards
I totally agree with G.A. Khater that helium porosimeter is the best way to get assign porosity and MICP tool to assign the pore throat distribution and percentage of each pore size
Dear All, you may get the porosity from BET, that is include N2 or Ar adsorption-desorption, which give you a full isotherm, and pore distribution. From the pore distribution, the materials may be classified as 3 categories, microprous (50 nm.
This is the classification by IUPAC.
There are many other methods that include MB adsorption, but I do not recall the citation at the moment.
Regards,
A suitable technique to characterize ordered-pore structures is called small angle X-ray diffractometry which you actually used. Materials like MCM41 can be well characterized in the few nms scale. Please visit the links:
https://www.researchgate.net/post/How_low_angle_XRD_explains_the_mesoporosity_of_a_material
Article Pore Size Determination in Ordered Mesoporous Materials Usin...
Article Encapsulation of Biosynthesized Nanosilver in Silica Composi...
- Badges
- Science method
- Similar topics
- Methodology
- Crystallography
- X-ray Diffraction