Absorption and quantitative characteristics of C-H bond and O-H bond of NIR

Abstract

The previous study mainly focused on the interpretation of the relationship between absorption characteristics and quantitative contribution in each near infrared (NIR) frequency range. Furthermore, the absorption characteristics of NIR mainly cover overtones and combinations of molecular vibrations such as CH, OH, SH, and NH bonds. And it has been know that NIR wavelengths of C-H bond and O-H bond are assigned to different radio frequencies. This paper was intended to investigate the absorption characteristics of bond C-H and O-H bonds in NIR spectral range. Water and acetone which correspond to O-H and C⎯H bonds have been selected as typical solvents, as well as solutes. Calibration models were established using par tial least square regression (PLS) and multiple linear regression (MLR). The parameter of the model were optimized by different spectral pretreatment methods. The result showed that the model set by Savitzky⎯Go lay smooth (SG) in the spectral region of 810-1100 nm could successfully make accurate predictions. Short wave NIR region has been discovered as optimum characteristic absorption of C-H and O-H bonds.

Micro‐ and Nanostructured Surfaces for Selective Solar Absorption

“…1D slab arrays can be optimized for polarization-independent operation in a similar way to metal-only gratings. A Ag/SiO 2 / Ag slab grating by Wu et al [ 86 ] (see Figure 9 b) was optimized using a numerical algorithm for both TE and TM polarizations, predicting a total absorption over 97% at 523 nm. High REVIEW levels of absorption were maintained for both polarizations for incident angles up to 40°.…”

“…Adapted with permission. [ 86 ] Copyright 2013, Elsevier. Experimental demonstrations of 1D slab arrays: c) Ag/ SiO x /Ag.…”

New sensor technologies in quality evaluation of Chinese materia medica: 2010–2015

“…Moreover, with the rapid development of information technologies and especially developments in chemometrics, online NIR sensors have increasing applications in quality analysis abroad3, 4, 5.…”

In-vivo evaluation of clindamycin release from glyceryl monooleate-alginate microspheres by NIR spectroscopy

“…The wave number of NIR is from 4000 cm -1 to 12500 cm -1 , which mainly covers overtones and combinations of molecular vibrations for functional groups involving hydrogen atom such as C-H, N-H, O-H, and S-H gps. Based on the molecular vibrations, the NIR frequency range can be divided into four ranges: combination region (4000-4900 cm -1 ), first combination 115 overtone (4900-7100 cm -1 ), second combination overtone (7100-10000 cm -1 ), and third overtone (10000-12500 cm -1 ) (Wu, Ouyang et al 2014). Usually, multivariate calibration needs to be employed for modelling spectral data and establishing the relationship of the whole data set to the concentrations of analytes.…”