I think 0.2 or 0.45 micron ptfe filter paper wouldn't work because particle sizes are much smaller than pore size of the papers. Can anyone describe the method of Remi R-4C centrifuge to filter out such particles ?
You just can't filter nanoparticles with that size (5 to 25nm). What is the nanoparticle you are filtering? Why do you want to filter? to separate solid from liquid? You may want to use nano spray dry.
Gitartha Kumar Chakraborty
Not sure what you're trying to do. What is the fraction you want to retain and what is the fraction you want to reject? Are you trying to concentrate the nanoparticles in the 5 - 25 nm range? If you attempt to dry the nanoparticles then they'll lose their 'nano-ness'. You need to retain them in suspension to avoid irreversible aggregation on drying. See, for example, this webinar (registration required):
Dispersion and nanotechnology
https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W190528DispNanoMat
.. and 2 quotes from those greater than I...:
- 'I think dry nanotechnology is probably a dead-end' Rudy Rucker Transhumanity Magazine (August 2002)
- ‘If the particles are agglomerated and sub-micron it may be impossible to adequately disperse the particles……‘The energy barrier to redispersion is greater if the particles have been dried. Therefore the primary particles must remain dispersed in water….’ J H Adair, E. Suvaci, J Sindel, “Surface and Colloid Chemistry” Encyclopedia of materials: Science and Technology pp 8996 - 9006 Elsevier Science Ltd. 2001 ISBN 0-08-0431526
@ Marilou Sarong & @ Alan F Rawle, I have MWCNTs with diameter 5-25nm which have been acid functionalised by me. To attach these CNTs to Transition metal oxide (TMO), I wanted to filter thsese CNTs. The particles got very well dispersed in the acid mixture. How do I get back these particles so that I can attach them to TMOs ? Without filtering, would directly putting the acid+CNT solution to the TMO solution and then stirring magnetically work for this purpose? Thank you very much.
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