The AlCoCrFeNi high-entropy alloy powder was produced by using a plasma rotating electrode process. The morphology, microstructure, and physical properties of the powder were characterized. The powder exhibited a smooth surface and a narrow particle size distribution with a single peak. The relationships between particle size and secondary dendrite arm space as well as cooling rate were evaluated as follows: λ = 0.0105 + 0.062 and = 4.34 × 10 + 2.62 × 10, respectively. The AlCoCrFeNi powder mainly consisted of fcc + bcc phases. As the powder particle size decreased, the microstructure of the powder changed from dendritic to columnar or equiaxed, along with a decrease in the fcc content and an increase in the bcc content. The tap density (4.76 g cm), flowability (15.01 s × 50 g), oxygen content (<300 ppm), and sphericity (>94%) of the powder indicated suitability for additive manufacturing.
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http://dx.doi.org/10.1021/acsomega.4c00291 | DOI Listing |
Anal Bioanal Chem
December 2024
Department of Analytical Chemistry and Organic Chemistry, Universitat Rovira i Virgili, Carrer Marcel·lí Domingo 1, 43007, Tarragona, Spain.
Analysing samples in their original form is increasingly crucial in analytical chemistry due to the need for efficient and sustainable practices. Analytical chemists face the dual challenge of achieving accuracy while detecting minute analyte quantities in complex matrices, often requiring sample pretreatment. This necessitates the use of advanced techniques with low detection limits, but the emphasis on sensitivity can conflict with efforts to simplify procedures and reduce solvent use.
View Article and Find Full Text PDFJ Pharm Sci
December 2024
Drug Product Development, Medicine Development & Supply, GSK R&D, Collegeville, PA 19426, USA. Electronic address:
This study determined process conditions under which polystyrene (CPS) and zirconia (YSZ) beads cause similar breakage kinetics and temperature rise during manufacturing of drug nanosuspensions via wet bead milling and explored relative advantages of CPS beads, particularly for stress-sensitive compounds. Besides temperature and particle size measurements, a microhydrodynamic-based kinetic model simulated the conditions for CPS to achieve breakage rates equivalent to those of YSZ. A power law correlation was applied to find conditions conducive to temperature equivalency.
View Article and Find Full Text PDFTalanta
December 2024
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan, 030006, China; Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China.
The combined application of near-infrared spectroscopy (NIRS) and X-ray fluorescence spectroscopy (XRF) has achieved remarkable results in coal quality analysis by leveraging NIRS's sensitivity to organic compounds and XRF's reliability for inorganic composition. However, variations in particle size distribution negatively affect the diffuse reflectance of NIRS and the fluorescence signal intensities of XRF, leading to decreased accuracy and repeatability in predictions. To address this issue, this study innovatively proposes a particle size correction method that integrates image processing and deep learning.
View Article and Find Full Text PDFMikrochim Acta
December 2024
Department of Analytical Chemistry and Food Technology, Environmental Sciences Institute (ICAM), University of Castilla-La Mancha, Avda. Carlos III S/N, 45071, Toledo, Spain.
Single particle inductively coupled plasma mass spectrometry (SP-ICP-MS) is a powerful tool for metallic nanoparticle (NP) characterisation in terms of concentration and, taking into account several assumptions, also size. However, this technique faces challenges, such as the intrinsic matrix effect, which significantly impact the results when analysing real complex samples. This issue is critical for the calculations of key SP-ICP-MS parameters ultimately altering the final outcomes.
View Article and Find Full Text PDFChem Pharm Bull (Tokyo)
December 2024
School of Traditional Chinese Medicines, Shenyang Pharmaceutical University.
Enteric-coated microcapsules can protect roxithromycin (ROX) from acid hydrolysis enhancing efficacy, solubility, and dissolution rate, representing a promising oral formulation for children and patients with swallowing difficulties. ROX-layered core particles were obtained with polyvinylpyrrolidone (PVP) K30 as the binder and Eudragit L30 D-55 as the coating material using the Wurster process in a fluidized bed processor. The enteric-coated microcapsules were characterized using powder X-ray diffraction, differential scanning calorimetry, and polarized optical microscopy.
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