Group frequencies are characteristic of small groups of atoms or functional groups such as CH₂, OH, and C=O. These types of bands are typically seen above 1,500cm-1 in the infrared spectrum and they’re usually unique to a specific functional group, making them a reliable means of iden...
(Irtran-4) 1.0-19.5 10,000-515 2.41 Insoluble Polyethylene (high density) 16-333 625-30 1.54 (at 5,000 cm-1) Insoluble 窗片的选择和使用 红外官能团区域表Infrared Functional Group Table 固体样品测量 固体样品的制备和测试 固体样品可以有各种不同的形态,有粉末样品,有颗粒状、块状样品,也有薄膜,...
From the analysis of 3601 features, 122 demonstrated statistically significant differences (p < 0.05), indicating notable group-level variations (Supplementary, Table S1). These features, often associated with specific molecular vibrations, suggest distinct molecular interactions or functional group chan...
The infrared spectrum generated by the sample will therefore depend on the type of molecule and chemical functional group involved in the phenomenon. For example, a carboxylic group (−C = OOH) typical of an acid will absorb energy at a different wavelength from the carbonyl group (C = O)...
3), the milled sample contains only one sharp peak at 3004 cm−1 characteristic to the associated −OH groups and this main functional group refers to Polypropylene non-woven fabrics [47]. Also, other distributed weak peaks appeared at 2950 cm−1 because of C–H present in CH2OH ...
Full size table Figure 3 Partial least square regression (PLSR) models for the prediction of lignin (A) and energy (B) content in extractive-free poplar wood exhibiting a natural range of variability. Lignin was measured with the acetyl bromide method. The energy content was determined with a...
aA relative extensive, comprehensive of interpretation of FTIR spectral has been tabulated in Table 1, which offers a detailed description of spectral frequencies of the organic functional group and elemental composition. 正在翻译,请等待...[translate]...
in the temperature range of less than 500°C, the size of aromatic lamellae of coal decreases, the distance between lamellae decreases, and the degree of bridge bond breaking, aliphatic side chain cracking, and oxygen- containing functional group cracking rises, suggesting that the degree of aroma...
Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy is a type of FTIR used to identify and quantify the organic functional groups and inorganic ions in aerosol samples. From: Microchemical Journal, 2020 About this pageSet alert ...
Table 2. Prediction ability of lard in palm oil by ATR-FTIR. Spectral region (cm−1)Baseline typeFactorsR2RMSECRMSECVRMSEP 1118–1096 None 1 0.9861 1.98 3.67 0.978 1250–1150 None 1 0.9772 2.64 1.73 0.989 1128–1259 None 2 0.9671 1.19 2.98 0.963 3067–2745 None 4 0.9188 0.469 2.34 0.953...