FT-IR Analysis Of Raman

1310 Words 6 Pages
FT-IR analysis.
Figure 1 shows infrared spectra of CNC, CNC treated with HCl and CNC treated with NaOH. This Data suggests that there are no significant changes in the structure of CNC due to extreme acid and basic media exposition. All the major vibration modes remained unchanged, this included 3330 cm-1 broad band corresponding to OH stretching, 2890 cm-1 due to CH2 and CH asymmetric and symmetric stretching, 1638 cm-1 related to the bending mode of absorbed water, 1430 to 1330 regions corresponding to CH2 and CH bending, the sharp band around 1100 cm-1 due to C-O-C asymmetric stretching (β-glucosidic linkage) and C-O/C-C (ring) stretching. 895 cm-1 of the CH rocking mode and the broad band starting 730 cm-1 of the out-of-plane bending of OH and β-glucosidic linkage. 1

Raman analysis
As seen in Figure 2 CNC and CNC treated with HCl and NaOH shows no major differences in the Raman bands. This supports the finding of the FT-IR analysis, and suggests once again that CNC is chemically stable to extreme acid and basic pHs. To assign the bands of the Raman spectrum, it can be divided into regions: 250-550 cm-1 corresponds to skeletal bending modes involving C-O-C and C-C-C, 895 cm-1 band is characteristic of CH2 rocking, 950-1180 cm-1 region is dominated by C-O and C-C stretching and coupling between glucose rings, CH
…show more content…
This Data indicates that the average diameter of CNC in suspension is around 125 nm. An increase in the diameter can be noticed when CNC is treated with HCl and NaOH due to removal of sulfate groups on the surface of CNC that favors the agglomeration of the particles. This hypothesis is supported by the decrease in the surface charge expressed in the Z-potential values. It should be pointed out that the instrument was unable to determine the diameter of CNC treated with NaOH due to a wide range of sizes presents in the suspension (Polydispersive index too

Related Documents