thank you for this insightful lecture. I have a small question, if I have a porous material with nanoparticles in the matrix can I do SAXS to understand the distribution of the nanoparticle; can I compare two materials will SAXS analysis be helpful?
It may be possible to get size and size distribution information on nanoparticles in a porous matrix. Check out the publications which were done with the group of Zoe Schnepp (lookingatnothing.com) where we did something similar. As always, it relies heavily on how systematic and careful you do your measurements. Good luck!
As always a great talk Dr. Pauw. Thank you for sharing! Two small questions: 1) In your example of the Fourier Transformation we saw that we lose phase information, so we get no absolute information about anisotropic effects. But would it still be viable to describe a degree of orientation by a relative comparison and a possible change in intensity? E.g. cylindric particles measured in random orientation vs. cyclindric particles with high degrees of alignment (e.g. by cresting them or enforced orientation by applying a current)? To be precise I have a sample of cyclindric particles and we wondered if we could use SAXS to determine if they align in a matrix in a certain way (degree of alignment and maybe angle dependency) at different currents. 2) I saw that you worked on a SAXSess mc2, which by default provides data in the .pdh format. Former colleagues of mine used the same instrument and complained a lot about outdated evaluation software and the presented DAWN software looks very interesting and promising. Is there a way to convert the .pdh files into NXsas files?
Hello Baganda, 1) The information loss means that we cannot tell which material phase we scatter from. However, orientation of anisotropic scatterers is something we can measure with the right equipment (a pinhole-collimated beam and a 2D detector). That is something we've done in the past on fibers, which have an elongated pore structure in the fiber direction. You can then derive an orientation distribution of the particles. I also have literature examples of people doing this (or SANS) with particles in elastomers, which then orient depending on the degree of stretching... 2) heh, yes. PDH is a bit of a funny format. We're working on translating the data to NeXus and using DAWN for correction to get a unified processing over the instruments in our lab. One missing component is a good example implementation of a desmearing routine, which would be required for visualization purposes. Once I have some time, I'll write one of those so my colleagues can recode that as an optional processing step in DAWN. Time is unfortunately not something I've much of...
thank you for this insightful lecture. I have a small question, if I have a porous material with nanoparticles in the matrix can I do SAXS to understand the distribution of the nanoparticle; can I compare two materials will SAXS analysis be helpful?
It may be possible to get size and size distribution information on nanoparticles in a porous matrix. Check out the publications which were done with the group of Zoe Schnepp (lookingatnothing.com) where we did something similar. As always, it relies heavily on how systematic and careful you do your measurements. Good luck!
As always a great talk Dr. Pauw. Thank you for sharing! Two small questions:
1) In your example of the Fourier Transformation we saw that we lose phase information, so we get no absolute information about anisotropic effects. But would it still be viable to describe a degree of orientation by a relative comparison and a possible change in intensity? E.g. cylindric particles measured in random orientation vs. cyclindric particles with high degrees of alignment (e.g. by cresting them or enforced orientation by applying a current)? To be precise I have a sample of cyclindric particles and we wondered if we could use SAXS to determine if they align in a matrix in a certain way (degree of alignment and maybe angle dependency) at different currents.
2) I saw that you worked on a SAXSess mc2, which by default provides data in the .pdh format. Former colleagues of mine used the same instrument and complained a lot about outdated evaluation software and the presented DAWN software looks very interesting and promising. Is there a way to convert the .pdh files into NXsas files?
Hello Baganda,
1) The information loss means that we cannot tell which material phase we scatter from. However, orientation of anisotropic scatterers is something we can measure with the right equipment (a pinhole-collimated beam and a 2D detector). That is something we've done in the past on fibers, which have an elongated pore structure in the fiber direction. You can then derive an orientation distribution of the particles. I also have literature examples of people doing this (or SANS) with particles in elastomers, which then orient depending on the degree of stretching...
2) heh, yes. PDH is a bit of a funny format. We're working on translating the data to NeXus and using DAWN for correction to get a unified processing over the instruments in our lab. One missing component is a good example implementation of a desmearing routine, which would be required for visualization purposes. Once I have some time, I'll write one of those so my colleagues can recode that as an optional processing step in DAWN. Time is unfortunately not something I've much of...
@@drheaddamage Thank you very much!