Hi,
I am studying on the effect of activated carbon particle size to supercapacitor electrode physicochemical and electrochemical properties.
I am planning to use laser diffraction particle size (LDPS) analyser but i cannot perform the analysis until i know the refractive and absorption index for my commercial coconut activated carbon. I cannot find any published paper that state the refractive and absorption index for activated carbon even though the published journal paper used LDPS to calculate their activated carbon particle size.
I've found a book that state the refractive index of carbon black. So, is it applicable if i assume the refractive index of my acitvated carbon is the same as carbon black?
What instrument that i can use to analyse the refractive index for my activated carbon?
Hope for the reply
Thank you
first hand you can assume it is the same. Then you should check how sensitive are results on changing the values.
I agree with Titus; a robustness (= sensitivity) study on the effect of the imaginary component is essential in any method development. Couple of useful rules of thumb:
- If the material is large (> 40 lambda; 25 um for a He-Ne laser; ISO13320:2009) then there's likely to be very good robustness to change in optical properties as the particle is essentially opaque to the incident radiation
- A dry measurement will always have better robustness to RI changes as the relative refractive index is always higher in air than in a fluid
- Note that carbon black and activated carbon are similar (typically the real part is around 1.5 - 1.6) but much different from graphite (1.83?) and diamond (2.42) which are other forms of carbon
Couple of background webinars:
June 22nd 2010 Determination of the optical properties of CeO2 and CaCO3 by the volume concentration experiment - the 3 S's, Beer-Lambert and Mie
https://www.brainshark.com/malvern/vu?pi=zF2zI6Y3fz5chz0&tx=preview
June 27th, 2006 Optical Properties - use and abuse http://tinyurl.com/jo2u6p9
Dear Aisyah,
I think you can use infrared internal reflectance spectroscopy (IRS) for analysis.
I agree with Alan for detailed information regarding the refractive and absorption index for commercial coconut activated carbon.
Regards,
Gowhar
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