Infrared and Fourier transform infrared spectroscopy for nanofillers and their nanocomposites

Performance Evaluation of Two Commercially Available Portable Spectrometers to Non-Invasively Determine Table Grape and Peach Quality Attributes

“…Consequently, the light is reflected, transmitted, or absorbed [6]. A specific molecule, such as the water molecule, can partially or fully absorb the light at a given wavelength or wavelength range resulting in the absorption spectrum.The resulting VIS/NIR, VIS, or NIR spectra of a fresh fruit or vegetable are frequently convoluted due to several interfering factors: Water highly absorbs NIR radiation; low signal-to-noise ratio (SNR) (i.e., measure of the quality or resolution of a peak); high overlap of combination (i.e., simultaneous stretching and excitation bands) and overtones (i.e., bands due to transitions of molecules from ground to higher energy levels) bands; scattering of light (e.g., specular or mirror-like reflectance); instrumental noise; and complex constitution of the biological sample such as a fruit tissue heterogeneities [5,[7][8][9][10]. Chemometrics, or computational chemistry, and mathematical and multivariate statistical tools (e.g., partial least-squares regression) and spectral pre-processing treatments are essential to extract the fruit quality relevant information from the convoluted VIS/NIR spectrum [8,[11][12][13].…”

Laser Ablation-Assisted Synthesis of Poly (Vinylidene Fluoride)/Au Nanocomposites: Crystalline Phase and Micromechanical Finite Element Analysis

“…The FTIR spectrum of PVDF shows vibration bands at 610, 763, and 975 cm −1 , used for the α-phase identification. Also, the absorption peak at 431, 840, 1165, 1176 cm −1 are the characteristic band of β-phase [ 48 , 49 , 50 ]. As could be observed in the figure, by increasing the Au nanoparticles concentration, the intensity of the peaks at 610 and 763 cm −1 related to α-phase was decreased.…”

Monitoring intermediate species formation by DRIFT during the simultaneous removal of soot and NOx over LaAgMnO3 catalyst

“…6), several signals can be observed, the broad and intense band around 3490 cm -1 is attributed to symmetric and antisymmetric -OH stretching J o u r n a l P r e -p r o o f vibration mode of water adsorbed on catalyst surface, which quickly disappears once the heating process starts [19,22,[33][34][35][36][37][38][39]. This signal can also be correlated with the ones observed at 1620 cm -1 and 1430 cm -1 normally associated with the -OH bending vibration mode of water over Mn atoms [33,69] which also decreased with temperature. However, it was noticed that after 200 °C these signals remain constant with temperature and only the low intense band at 1587 cm -1 attributed to OH groups vibration on La(OH)3 could survive the thermal process due to its high stability [55,67,68] Although the formation of La(OH)3 through the La2O3 hydration under atmospheric conditions has been suggested in some studies [55,68] involving perovskite synthesis, its contribution is pretty low as it was confirmed by XPS.…”