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Knut Baumann of the University of Technology Braunschweig. Photo Credit: © Knut Baumann

Spectroscopy sat down with Knut Baumann of the University of Technology Braunschweig to discuss his latest research examining the classification of two closely related horsetail species, Equisetum arvense (field horsetail) and Equisetum palustre (marsh horsetail), using near-infrared spectroscopy (NIR).

To better determine fish freshness within the context of rapid spectroscopic analyses, salmon fillet was analyzed via hand-held fluorescence and absorption spectroscopy devices across the visible and near-infrared (vis-NIR) range and benchmarked against industry-standard potentiometry and the gold-standard laboratory procedure, nucleotide extraction assays, over a 11-day period.

Future looking alternative energy technology concept with a digital lithium ion rechargeable battery symbol and a high voltage charging energy storage icon with bright blue neon lightning particles. Generated by AI. | Image Credit: © AkuAku - stock.adobe.com

A comprehensive understanding of aging phenomena and the resulting performance loss occurring in lithium-ion batteries (LIBs) is essential for ongoing improvement of the technology. The formation of a uniform solid electrolyte interphase (SEI) is of crucial importance for the performance, lifetime, and safety of LIBs. Transition metal dissolution (TMD), caused by degradation of the cathode, and subsequent TM deposition on the anode surface can deteriorate the protective properties of the SEI, possibly leading to reconstruction of the SEI and loss of active lithium. We explore this topic here.

High-angle view of intricately patterned cultivation areas, highlighting the artistry in agricultural land use. The fields are divided into distinct sections with varying crop types, forming a mosaic. Generated by AI. | Image Credit: © Thanyaporn - stock.adobe.com.

In recent years, advances in X-ray optics and detectors have enabled the commercialization of laboratory μXRF spectrometers with spot sizes of ~3 to 30 μm that are suitable for routine imaging of element localization, which was previously only available with scanning electron microscopy (SEM-EDS). This new technique opens a variety of new μXRF applications in the food and agricultural sciences, which have the potential to provide researchers with valuable data that can enhance food safety, improve product consistency, and refine our understanding of the mechanisms of elemental uptake and homeostasis in agricultural crops. This month’s column takes a more detailed look at some of those application areas.

Visualizing Propane: Molecular Structure in 3D. Generated with AI. | Image Credit: © Samana - stock.adobe.com.

In the fourth installment of our review of infrared spectral interpretation, we will discuss the spectroscopy of hydrocarbons. We will look at the stretching and bending vibrations of methyl (CH3) and methylene (CH2) groups, how to distinguish them, and how to know whether one or both of these functional groups are present in a sample. We will also discuss aromatic hydrocarbons, specifically the C-H stretching and bending peaks of mono- and disubstituted benzene rings, and how to distinguish them.