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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

1.8K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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IR Spectrum01:19

IR Spectrum

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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%...
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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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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...
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IR Spectrometers01:25

IR Spectrometers

1.2K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
1.2K
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

2.3K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks
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Structural Unit Determination in Silica Nanoparticles Using Infrared Micro-Reflectance Spectroscopy.

Mireia Sainz-Menchón1, Iñigo González de Arrieta1,2, Abdelali Zaki2,3

  • 1Physics Department, University of the Basque Country (UPV/EHU), Leioa, Spain.

Applied Spectroscopy
|December 22, 2023
PubMed
Summary

This study introduces an infrared (IR) micro-reflectance method for analyzing glassy nanomaterials. The technique accurately quantifies structural units in glasses, validated by nuclear magnetic resonance spectroscopy.

Keywords:
Infrared spectroscopyeffective medium theoriesglass structureinfrared microscopysol-gel silica

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Nanotechnology

Background:

  • Characterizing the structure of glassy nanomaterials is crucial for understanding their properties.
  • Existing methods may have limitations in quantitative analysis or require specialized equipment.

Purpose of the Study:

  • To present a novel method for structural characterization of glassy nanomaterials using infrared (IR) micro-reflectance.
  • To validate the quantitative accuracy of the proposed IR method.

Main Methods:

  • Utilizing near-specular reflectance spectra from pressed pellets of glassy nanomaterials.
  • Applying a model that links silicate glass structure to dielectric response.
  • Employing effective medium approximation to account for porosity.
  • Analyzing integrated intensities of phenomenological IR bands attributed to specific structural units (, , ).

Main Results:

  • The IR micro-reflectance method allows for the quantification of relative populations of key structural units.
  • Quantitative results obtained from IR analysis showed good agreement with those from magic-angle spinning nuclear magnetic resonance (MAS-NMR).

Conclusions:

  • The developed IR micro-reflectance method is a feasible and accurate approach for quantitative structural characterization of glassy nanomaterials.
  • This technique provides valuable insights into the composition and structure of glasses, complementing existing analytical methods.