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Applications of IR Spectroscopy: Overview

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...

IR Spectrum

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...

IR Frequency Region: Fingerprint Region

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...

IR Frequency Region: Alkyne and Nitrile Stretching

IR Frequency Region: Alkyne and Nitrile Stretching

Both alkyne (C≡C) and nitrile (C≡N) functional groups contain triple bonds and show stretching absorptions around the wavenumber range of 2100 to 2300 cm−1 in the diagnostic region of the IR spectra.
Comparing the stretching vibrational frequency of C≡C triple bonds with that of double and single bonds, it is evident that C≡C triple bonds exhibit a higher stretching frequency than C=C double and C–C single bonds. Similarly, the C≡N triple bond exhibits higher stretching absorption than the C=N...

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...

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Related Experiment Video

Updated: Jun 25, 2026

Enhanced Photoluminescence of Curcuma longa Extracts via Chitosan-Mediated Energy Transfer for Textile Authentication Applications

Enhanced Photoluminescence of Curcuma longa Extracts via Chitosan-Mediated Energy Transfer for Textile Authentication Applications

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[NIR analysis of textile natural raw material].

Ying Zhou¹, Hui-rong Xu, Yi-bin Ying

¹College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China.

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|March 3, 2009

Summary

Near-infrared (NIR) spectroscopy offers a rapid, non-destructive method for textile analysis. This technology, combined with chemometrics, overcomes limitations of traditional methods, enabling faster and more accurate fiber identification and content analysis.

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Area of Science:

Analytical Chemistry
Spectroscopy
Chemometrics

Context:

Traditional textile fiber analysis methods (microscopy, solution methods) are time-consuming, require expertise, and are prone to artificial errors.
Near-infrared (NIR) spectroscopy presents a faster, non-destructive alternative for textile analysis.
NIR technology, when integrated with chemometrics, effectively addresses challenges like spectral overlap and weak information signals.

Purpose:

To explore the application of Near-Infrared (NIR) spectroscopy in the textile industry for analyzing natural raw materials.
To demonstrate the efficacy of NIR technology in discriminating between different natural fiber varieties.
To assess the capability of NIR for detecting foreign fibers within textile samples.

Summary:

NIR spectroscopy, enhanced by chemometrics, significantly reduces textile analysis time from hours to seconds.
The study focuses on NIR's application in differentiating natural fibers (wool, cotton, silk) and identifying foreign fibers.
Research investigates NIR's potential for predicting properties like residual grease, mean fiber diameter (MFD), and moisture content in natural fibers.

Impact:

Provides a significantly faster (30 seconds vs. 6 hours) and more objective method for textile fiber analysis.
Enables non-destructive testing, preserving sample integrity for further analysis.
Facilitates large-scale sample analysis, improving efficiency in the textile industry.