Microsc Microanal
Department of Microstructure Physics and Alloy Design, Max Planck Institute für Eisenforschung, Max Planck Straße 1, 40237 Düsseldorf, Germany.
Published: August 2024
The biocompatibility and resorption characteristics of β-tricalcium phosphate (β-TCP, Ca3(PO4)2) have made it a coveted alternative for bone grafts. However, the underlying mechanisms governing the biological interactions between β-tricalcium phosphate and osteoclasts remain elusive. It has been speculated that the composition at grain boundaries might vary and affect β-TCP resorption properties. Atom probe tomography (APT) offers a quantitative approach to assess the composition of the grain boundaries, and thus advance our comprehension of the biological responses within the microstructure and chemical composition at the nanoscale. The precise quantitative analysis of chemical composition remains a notable challenge in APT, primarily due to the influence of measurement conditions on compositional accuracy. In this study, we investigated the impact of laser pulse energy on the composition of β-TCP using APT, aiming for the most precise Ca:P ratio and consistent results across multiple analyses performed with different sets of analysis conditions and on two different instruments.
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http://dx.doi.org/10.1093/mam/ozae077 | DOI Listing |
ACS Appl Mater Interfaces
January 2025
Department of Materials Science and Engineering, Feng Chia University, Taichung City, 40724, Taiwan.
The unique optical properties of perovskite quantum dots (PQDs), particularly the tunable photoluminescence (PL) across the visible spectrum, make them a promising tool for chlorinated detection. However, the correlation between the fluorescence emission shift behavior and the interface of phase transformation in PQDs has not been thoroughly explored. In this study, we synthesized CsPbBr PQDs via the hot-injection method and demonstrated their ability to detect chlorinated volatile compounds such as HCl and NaOCl through a halide exchange process between the PQDs' solid thin film and the chlorinated vapor phase.
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January 2025
Department of Mathematical and Natural Sciences, Özyeğin University, Istanbul, Türkiye.
The present study introduces the idea of a novel fluorescence-based imaging technique combined with a microfluidic platform that enables a precise control of dark transient state populations of fluorescent probes flowing over a uniform, top flat supergaussian excitation field with a constant flow rate. To demonstrate the imaging capability of the proposed detection method, numerical simulations have been performed by considering laser, microscope and flow parameters of experimental setup together with photophysical model and electronic transition rates of fluorescent dyes. As an output data to be assessed, fluorescence image data is simulated numerically for bromine-free carboxyfluorescein and its brominated derivatives having different numbers of bromine atoms.
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January 2025
School of Chemical and Biological Engineering, Institute of Chemical Process (ICP), Institute of Engineering Research, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.
As an oxidant, the ferryl-oxo complex (Fe═O) offers excellent reactivity and selectivity for degrading recalcitrant organic contaminants. However, enhancing Fe═O generation on heterogeneous surfaces remains challenging because the underlying formation mechanism is poorly understood. This study introduces edge defects onto a single-atom Fe catalyst (FeNC-edge) to promote Fe═O generation via peroxymonosulfate (PMS) activation.
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January 2025
Center for Physical Sciences and Technology (FTMC), Saulėtekio Ave. 3 LT-10257 Vilnius, Lithuania. Electronic address:
The combination of surface-enhanced Raman spectroscopy in the ultraviolet spectral region (UV-SERS) with resonance Raman scattering enhancement, referred to as UV-SERRS, enables ultrasensitive and reliable detection of biomolecules because of the strong electronic transition of many biologically important compounds in UV region. Adenine solution studies by UV-Raman spectroscopy revealed pre-resonant enhancement of various modes by 2-16 times at 325 nm excitation wavelength. Adsorption and structural properties of adenine on a cobalt electrode were probed by UV-SERS.
View Article and Find Full Text PDFNat Commun
January 2025
Department of Physics and Astronomy, University of California, Riverside, CA, USA.
The floating phase, a critical incommensurate phase, has been theoretically predicted as a potential intermediate phase between crystalline ordered and disordered phases. In this study, we investigate the different quantum phases that arise in ladder arrays comprising up to 92 neutral-atom qubits and experimentally observe the emergence of the quantum floating phase. We analyze the site-resolved Rydberg state densities and the distribution of state occurrences.
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