Electronic two-dimensional Fourier transform (2D-FT) spectroscopy is applied to semiconducting single-walled carbon nanotubes and provides a spectral and time-domain map of exciton-phonon assisted excitations. Using 12 fs long pulses, we resolve side-bands above the E(22) transition that correspond with the RBM, G, G', 2G and other multiphonon modes. The appearance of 2D-FT spectral cross-peaks...

FT-Raman spectroscopy (FT-RS) was used to investigate green tea’s potential protective effect as an antioxidant during frozen storage of Atlantic mackerel (Scomber scombrus). stored for more than 26 weeks at −10°C or –80°C (control), with without tea (GT). Raman analysis showed substantial changes in protein structure due storage, especially the higher temperature (−10°C), compared findings −80...

For centuries, the colour of foods has played a significant role in way products are perceived and valued. Generally, more vibrant product, higher its quality price. modern-day consumers, various brightly coloured known as superfoods often consumed at concentrations than before. There is emerging attention for adulteration turmeric with yellow, toxic carcinogenic compound lead chromate. Rapid d...

The polyvinyl chloride (PVC) industry relies heavily on material property testing during the development of a product. Many these procedures are outdated and time-consuming, resulting in high financial input. Non-destructive, fast, easy-to-use methods can significantly reduce time required to quantify raw materials. We explored alternative analysis techniques, Fourier transform-infrared (FT-IR)...

Abstract FT-Raman spectroscopy was employed to study (in-vitro) non-altered human colorectal tissues aiming evaluate their spectral differences. The samples were collected from 39 patients, adding 144 spectra. The results enable one estabilish 3 well defined spectroscopic groups of what was consistently checked by statistical (clustering) and biological (histopathology) analysis. The similarity...

The present work describes a methodology for estimation of monomer concentration during homopolymerization reactions by Raman spectroscopy. The estimation is done using linear models based on two different approaches: a univariate approach and a multivariate approach (with principal component regression, PCR, or partial least squares regression, PLS). The linear models are fitted with data from...

• Graphene Oxide, enhanced Hummer technique, EDAX, FT-IR, Thin film, XPS, Raman. oxide (GO) sheets possess a 2D filiform structure and were indigenously synthesized via the methodology. It is accepted that redox approach may be distinctive technique to fabricate GO films as sheet on an expanded scale. Instrumental characterizations showed ready during this study had bi-directional lamellar laye...

The identification of coloring substances is a relevant task in the field conservation and restoration, but it can be challenging as real samples target analytes are inserted very complex matrix made binders additives. Understanding this concept fundamental for upper-division undergraduate students interested science; therefore, laboratory experiment aims to make aware problem leads them develo...