When Chitin and cellulose nanocrystals prepared using acid hydrolysis are mixed, I get two new peaks at 264 and 700. I have read some papers that indicate that these peaks correspond to aliphatic CC bonds but I not sure if that happens.
Note: these peaks do not show up on spectra when nanocrystals are are not mixed
Dear sir, please read
1.https://www.utsc.utoronto.ca/~traceslab/PDFs/raman_understanding.pdf
.2. https://www.chemie-biologie.uni-siegen.de/ac/be/lehre/ws1213/ir-ramanlong.pdf
3. https://www.lkouniv.ac.in/site/writereaddata/siteContent/202003281454236324abhinav_Raman_Spectroscopy2.pdf
Several vibrations give higher wavenumbers for Na-micas compared to K-micas, in accord with the smaller ionic size of Na + than K +. The =195 cm -1 and ~270 cm -1 peak wavenumbers and intensities vary as functions of the chemistry of the octahedral sites, i.e. the replacement of Mg 2+ by Mn 2+, Zn 2+, Cr 3+, Fe 3+, Ti 4+ , and especially by AP +, or by a vacancy, and the replacement of (OH)- by F-. The group of ~700 cm -1 peaks vary in wavenumber,and intensity with the replacement of Si by A1 in the tetrahedra; distinct Si-O-Si and,Si-O-AI vibrations can be recognized.
Hello Mohamed when you say 'mix' is it a physical mixture or a chemical interaction? if it is the former these peaks might be due to crystal(s) re-orientation in the new mixture. The latter could indicate the formation of a new bond.
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