Diffuse Reflectance Infrared Fourier Transform Spectroscopy: an
            <i>In situ</i>
            Method for the Study of the Nature and Dynamics of Surface Intermediates

Drochner, Alfons; Vogel, G. Herbert

doi:10.1002/9783527636839.ch14

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…The DRIFTS instrument operates by directing the IR radiation into a sample cup, where it interacts with the sample grains. The IR light is reflected or scattered off as it scans the surfaces, and becomes diffused (Drochner & Vogel 2012). The spatial resolution of the measurements was about 1 mm, but definitely below 1.5 mm due to the infrared spot size on the sample.…”

Section: Methodsmentioning

confidence: 99%

Irradiation induced mineral changes of NWA10580 meteorite determined by infrared analysis

Gyollai,

Biri,

Juhász

et al. 2024

A&A

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Identifying minerals on asteroid surfaces is difficult as space weathering modifies the minerals' infrared spectra. This should be better understood for proper interpretation. We simulated the space weathering effects on a meteorite and recorded the alterations of the crystalline structure, such as the change in peak positions and full width at half maximum values. We used proton irradiation to simulate the effects of solar wind on a sample of NWA 10580 CO3 chondrite meteorites. After irradiation in three gradually increased steps with 1 keV ion energy, we used infrared microscopic reflectance and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) to identify and understand the consequences of irradiation. We find negative peak shifts after the first and second irradiations at pyroxene and feldspar minerals, similarly to the literature, and this shift was attributed to Mg loss. However, after the third irradiation a positive change in values in wavenumber emerged for silicates, which could come from the distortion of SiO$_4$ tetrahedra, resembling shock deformation. The full width at half maximum values of major bands show a positive (increasing) trend after irradiations in the case of feldspars, using IR reflection measurements. Comparing DRIFTS and reflection infrared data, the peak positions of major mineral bands were at similar wavenumbers, but differences can be observed in minor bands . We measured the spectral changes of meteorite minerals after high doses of proton irradiation for several minerals. We show the first of these measurements for feldspars; previous works only presented pyroxene, olivine, and phyllosilicates.

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Section: Methodsmentioning

confidence: 99%

Irradiation induced mineral changes of NWA10580 meteorite determined by infrared analysis

Gyollai,

Biri,

Juhász

et al. 2024

A&A

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show abstract

“…For example, to minimise the effect of specular reflection, the sample particle size should be smaller than the wavelength of the incident radiation (generally between 780 nm and 1 mm). For highly absorbent samples, dilution in an IR non-absorbent matrix (KCl or KBr) allows for a deeper penetration of the incident radiation and minimises the contribution of specular reflection from the sample surface [67,[84][85][86][87][88].…”

Section: Sampling Techniques For Ir Analysismentioning

confidence: 99%

Physico-Chemical Approaches to Investigate Surface Hydroxyls as Determinants of Molecular Initiating Events in Oxide Particle Toxicity

Pavan

Santalucia

Escolano-Casado

et al. 2023

IJMS

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The study of molecular recognition patterns is crucial for understanding the interactions between inorganic (nano)particles and biomolecules. In this review we focus on hydroxyls (OH) exposed at the surface of oxide particles (OxPs) which can play a key role in molecular initiating events leading to OxPs toxicity. We discuss here the main analytical methods available to characterize surface OH from a quantitative and qualitative point of view, covering thermogravimetry, titration, ζ potential measurements, and spectroscopic approaches (NMR, XPS). The importance of modelling techniques (MD, DFT) for an atomistic description of the interactions between membranes/proteins and OxPs surfaces is also discussed. From this background, we distilled a new approach methodology (NAM) based on the combination of IR spectroscopy and bioanalytical assays to investigate the molecular interactions of OxPs with biomolecules and membranes. This NAM has been already successfully applied to SiO2 particles to identify the OH patterns responsible for the OxPs’ toxicity and can be conceivably extended to other surface-hydroxylated oxides.

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RETRACTED ARTICLE: Transformational thinking and a new deal in heterogeneous catalysis – III: fundamental paradigm shifts and future critical directions

Gogate¹

2018

Indian Chemical Engineer

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Diffuse Reflectance Infrared Fourier Transform Spectroscopy: an In situ Method for the Study of the Nature and Dynamics of Surface Intermediates

Cited by 3 publications

References 31 publications

Irradiation induced mineral changes of NWA10580 meteorite determined by infrared analysis

Irradiation induced mineral changes of NWA10580 meteorite determined by infrared analysis

Physico-Chemical Approaches to Investigate Surface Hydroxyls as Determinants of Molecular Initiating Events in Oxide Particle Toxicity

RETRACTED ARTICLE: Transformational thinking and a new deal in heterogeneous catalysis – III: fundamental paradigm shifts and future critical directions

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