Cited by 9Spectroscopy Techniques in Biomedical and Chemical ResearchSpectroscopy and Laser ApplicationsSpectroscopy and Chemometric Analyses

The DOI matches its Crossref record; 38 of the 38 references it cites were found in a registry or an index.

In Situ Time-Dependent Attenuated Total Reflection Fourier Transform Infrared (ATR FT-IR) Spectroscopy of a Powdered Specimen in a Controlled Atmosphere: Monitoring Sorption and Desorption of Water Vapor

Samokhvalov, Alexander, McCombs, Stanley·2023·Applied Spectroscopy

Abstract

Attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy is a powerful instrumental method of chemical analysis of solids and liquids. The majority of published studies by in situ ATR FT-IR spectroscopy describe analysis of homogeneous samples, such as liquid solutions under circulation, or films on the ATR crystal that react with the gas of interest. The in situ ATR FT-IR spectroscopic studies of specimens in physical shape of crystals or powder that react with a gas or vapor are rare. This work describes a modification of in situ time-dependent ATR FT-IR spectroscopy to allow monitoring heterogeneous reaction "solid-gas" of powder in controlled atmosphere and in the time domain. Also, we describe a new facile gas flow chamber attachment to ATR FT-IR spectrometer which allows creating controlled atmosphere surrounding the specimen on the ATR crystal. Additionally, the capabilities of the described in situ time-dependent ATR FT-IR spectroscopy experiment in controlled atmosphere are enhanced by the sensor for in situ time-dependent monitoring the relative humidity (RH) of air surrounding the specimen. The operation of the setup for in situ time-dependent ATR FT-IR spectroscopy in controlled atmosphere is demonstrated by monitoring reaction of gradual desorption of water vapor from color-indicating molecular sieves under controlled low air humidity. Further, the described spectroscopic method and apparatus is applied to monitor the reverse process, namely sorption of water vapor by color-indicating molecular sieves under controlled elevated air humidity. Water molecules are found to reversibly interact with two distinct sorption sites in the sorbent: the Si-O backbone and the color-indicating Co(II) centers. The reported variant of in situ time-dependent ATR FT-IR spectroscopy in controlled atmosphere is powerful, yet facile and straightforward. It is promising for mechanistic, in situ studies of sorption, desorption, chemosensing, heterogeneous catalysis and photocatalysis, and analysis of chemical kinetics of various "solid-gas" reactions.

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Crossref · 10.1177/00037028221148492

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Metadata

Authors
Samokhvalov, A., & McCombs, S.
Affiliations
Morgan State University (US)
Corresponding author
Samokhvalov, Alexander
Venue
Applied Spectroscopy
Published
2023-01-25
Volume
77
Issue
3
Pages
308-319
ISSN
  • 0003-7028 (ISSN-L)
  • 1943-3530
OpenAlex
W4311822526
Cited by
9
References
38
Citations by year
2026: 2 · 2025: 2 · 2024: 2 · 2023: 3
FWCI
0.78
Type
journal article
Language
en
Open access
closed
Locations
  • Applied Spectroscopy (publishedVersion)
  • PubMed (publishedVersion)
Funders
Army Research Office (W911NF-20-1-0290, W911NF-21-2-0213)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Spectroscopy Techniques in Biomedical and Chemical Research
  • Physical Sciences › Chemistry › Spectroscopy › Spectroscopy and Laser Applications
  • Physical Sciences › Chemistry › Analytical Chemistry › Spectroscopy and Chemometric Analyses
Keywords
controlled atmosphere, water vapor adsorption, water vapor desorption, relative humidity monitoring, gas-solid reactions, chemosensing, heterogeneous catalysis

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