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The suitability of broadband dielectric spectroscopy (DS) as a tool for in-line (in situ) reaction monitoring is demonstrated. Using the esterification of 4-nitrophenol as a test-case, we show that multivariate analysis of time-resolved DS data-collected across a wide frequency range with a coaxial dip-probe-allows reaction progress to be measured with both high precision and high accuracy. In addition to the workflows for data collection and analysis, we also establish a convenient method for rapidly assessing the applicability of DS to previously untested reactions or processes. We envisage that, given its orthogonality to other spectroscopic methods, its low cost, and its ease of implementation, DS will be a valuable addition to the process chemist's analytical toolbox.
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http://dx.doi.org/10.1021/acs.oprd.3c00081 | DOI Listing |
ACS Appl Mater Interfaces
September 2025
National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
In this study, we analyze InO thin-film transistors (InO-TFT) using synchrotron-based hard X-ray photoelectron spectroscopy (HAXPES) in conditions. A bottom-gate InO-TFT with a high- AlO gate dielectric, grown on thermally oxidized silicon (SiO/p-Si), was examined while operating at varying and . The results reveal that the In 3d core level binding energy varies along the horizontal channel length, driven by the potential gradient induced by .
View Article and Find Full Text PDFCompr Rev Food Sci Food Saf
September 2025
Agricultural Product Processing and Storage Lab, School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China.
Fruit and fruit-based products are a valuable source of essential nutrients, critical for food security, and drive economic productivity with minimal inputs. The significant rise in global demand for high-quality imported fruit and fruit-based products reflects a shift in consumer awareness and interest in the products origin and potential health-promoting bioactive compounds. Analytical techniques such as liquid chromatography, gas chromatography, inductively coupled plasma techniques, isotope-ratio mass spectrometry (IRMS), near infrared (NIR) spectroscopy, visible near infrared (VIS-NIR) spectroscopy, hyperspectral imaging (HSI), mid-infrared (MIR) spectroscopy, Raman spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, fluorescence spectroscopy, terahertz spectroscopy, dielectric spectroscopy, electronic nose (e-nose), and electronic tongue (e-tongue) coupled with supervised and unsupervised chemometrics can be employed for traceability, authentication, and bioactive profiling of fruit and fruit-based products.
View Article and Find Full Text PDFInt J Biol Macromol
September 2025
Department of Physics, Faculty of Education, Seiyun University, Hadhramout, Yemen. Electronic address:
In the present study, polymer composite samples were fabricated using the casting technique by incorporating varying weight percentages (0.0, 0.1, 0.
View Article and Find Full Text PDFACS Appl Mater Interfaces
September 2025
National Key Laboratory of Advanced Micro and Nano Manufacture Technology, Shanghai Jiao Tong University, Shanghai 200240, China.
Integrating surface-enhanced fluorescence (SEF) and surface-enhanced Raman spectroscopy (SERS) into a single probe is a natural step forward for plasmon-enhanced spectroscopy (PES), as SEF enables enhanced fluorescent imaging for fast screening of targets, while SERS allows ultrasensitive trace molecular characterization with specificity. However, many challenges remain, e.g.
View Article and Find Full Text PDFACS Omega
September 2025
Ming Hsieh Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, United States.
A nanosecond pulse transient plasma is employed to initiate and control the exothermic decomposition of ionic liquids, namely, a mixture of hydroxylammonium nitrate (HAN) and 1-ethyl-3-methylimidazolium ethyl sulfate [EMIM]/[EtSO], as well as some noncombustible ionic liquids. Here, the plasma is discharged in a cylindrical geometry with a coaxial center wire electrode. High voltage (20 kV) nanosecond pulses (20 ns) at various frequencies up to 10 kHz produce a plasma discharge in the ionic liquid that initiates its nonthermal decomposition.
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