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In this work, a sensor to evaluate sterilization processes with hydrogen peroxide vapor has been characterized. Experimental, analytical and numerical methods were applied to evaluate and study the sensor behavior. The sensor set-up is based on planar interdigitated electrodes. The interdigitated electrode structure consists of 614 electrode fingers spanning over a total sensing area of 20 mm². Sensor measurements were conducted with and without microbiological spores as well as after an industrial sterilization protocol. The measurements were verified using an analytical expression based on a first-order elliptical integral. A model based on the finite element method with periodic boundary conditions in two dimensions was developed and utilized to validate the experimental findings.
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http://dx.doi.org/10.3390/s151026115 | DOI Listing |
Chem Rec
September 2025
Department of Chemical Engineering, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, M. P., 462066, India.
Flow fields (FFs) play multifaceted roles in direct methanol fuel cells (DMFC) by facilitating the transport and distribution of species, removal of products, support to the membrane electrode assembly (MEA), electrical conductivity, water, and thermal management. Therefore, the performance of DMFC is directly related to the pattern and geometry of the FF. DMFCs can generate power density of up to ≈100-300 mW cm; however, their performance is impeded by cathode flooding, CO gas bubbles formation, and mass transfer limitations.
View Article and Find Full Text PDFAdv Mater
September 2025
Department of Chemical Engineering, McGill University, 3610 University Street, Montréal, QC, H3A 0C5, Canada.
Naturally conductive protein nanowires have inspired efforts to engineer electrical conductivity into synthetic fibrous proteins for the development of bioelectronic materials and devices. A comprehensive analysis of charge transport in these systems requires a combination of various measurement methods, instruments and electrode designs. Measurements under direct current (DC) typically focus on charge transport without distinguishing between charged species, requiring alternating current (AC) and electrochemical methods to probe additional phenomena.
View Article and Find Full Text PDFJASA Express Lett
September 2025
IEMN (UMR CNRS 8520), University Polytechnique Hauts-de-France, CNRS, University Lille, INSA HdF, F-59313 Valenciennes,
This study presents a non-destructive method for estimating surface acoustic wave attenuation, which is highly sensitive to microstructural features, especially at high frequencies. The method uses a single wideband dispersive interdigital transducer (IDT) that remotely emits acoustic waves at the sample's edge. Chirp compression of the temporal displacement response is achieved by correlating the excitation signal with the spatial configuration of the IDT's electrodes.
View Article and Find Full Text PDFTalanta
August 2025
Department of Chemistry, College of Science, King Khalid University, Abha, 62529, Saudi Arabia; Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha, 62529, Saudi Arabia.
Human papillomavirus type 16 (HPV-16) is a leading cause of cervical cancer among women worldwide. This study presents an electrochemical impedance spectroscopy (EIS)-based biosensor for the sensitive and selective detection of HPV-16 mutant DNA. A single-stranded DNA probe complementary to the target sequence was immobilized on a gold interdigitated electrode (G-IDE) modified with lanthanum strontium cobalt ferrite LaSrCoFeO (LSCF) nanopowder to enhance charge transfer.
View Article and Find Full Text PDFSustain Energy Fuels
August 2025
Electrochemical Materials and Systems, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands
Understanding reactive mass transport in redox flow reactors is key to improving performance, yet conventional characterization techniques often rely on cell-averaged metrics and fail to resolve local transport phenomena. In this study, we employ neutron radiography to visualize concentration distributions in redox flow cells with non-aqueous electrolytes, leveraging the high attenuation of hydrogen-containing organic molecules and boron-containing supporting ions. Symmetric flow cell experiments were conducted with three electrode types (paper, cloth, and a hierarchical porous electrode fabricated by non-solvent induced phase separation), and two flow field designs (parallel and interdigitated).
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