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Effects of thermal aging on the performance of ordinary and novel superhydrophobic and oleophobic ultra-fine dry powder extinguishing agent.
Sci Rep
January 2025
School of Safety Science and Engineering (School of Emergency Management), Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China.
Powder-based fire extinguishing agents have become a kind of promising substitutes for halon extinguishing agents in civil aircrafts. However, their storage lifespan, significantly influenced by the thermal aging, emerges as a crucial yet overlooked aspect for aviation use. This study investigates the effects of thermal aging cycles on various parameters of ordinary dry powder extinguishing agent (ODPEA) and novel superhydrophobic and oleophobic ultra-fine dry powder extinguishing agent (SHOU DPEA), including surface microscopic morphology, D90 (the diameter at which 90% of the cumulative volume of particles are equal to or smaller than this value), chemical structure, hydrophobic and oleophobic angles, flowability, extinguishing time and effectiveness.
View Article and Find Full Text PDFInfluence of chitosan encapsulation on functionality and stability of astaxanthin nanoemulsion fabricated using high pressure homogenizer.
Int J Biol Macromol
January 2025
Department of Food Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. Electronic address:
Astaxanthin is a natural antioxidant substance, but it can be easily degraded by light, heat, and oxidation. One solution to overcome these problems is to transform astaxanthin into nanoemulsion within a protective matrix produced during an encapsulation process. In this study astaxanthin nanoemulsion (ANE) and chitosan (CS) incorporated with ANE (CS-ANE) were fabricated using high-pressure homogenizer (HPH).
View Article and Find Full Text PDFAntibiofilm mechanism of mouse gastrointestinal stimulation against Vibrio parahaemolyticus under bile salt culture.
Microb Pathog
January 2025
College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China; Shanghai Engineering Research Center of Aquatic-Product Processing & Preservation, Shanghai 201306, China; Laboratory of Quality & Safety Risk Assessment for Aquatic Product on Storage and Preservation (Shanghai), Ministry of Agriculture and Rural Affairs, Shanghai 201306, China; Engineering Research Center of Food Thermal-processing Technology, Shanghai Ocean University, Shanghai 201306, China. Electronic address:
Bile salts are crucial microbe-selective inhibitors present in the intestinal tracts of humans and other animals. Environmental and clinical strains of Vibrio parahaemolyticus (V. parahaemolyticus) exhibited different biofilm-forming abilities under bile salt incubation.
View Article and Find Full Text PDFN-Heterocyclic Carbene Deposition on a Copper Powder Surface Using Mechanochemistry.
ACS Appl Mater Interfaces
January 2025
Department of Chemistry, McGill University, Montréal, Québec H3A 0G4, Canada.
Metal powders are crucial precursors for manufacturing surfaces through thermal spraying, cold spraying, and 3D printing methods. However, surface oxidation of these precursors poses a challenge to the coherence of the metallic materials during manufacturing processes. Herein, we introduce a method for surface modification of copper powder with N-heterocyclic carbenes (NHCs) using mechanochemistry to mitigate surface oxidation.
View Article and Find Full Text PDFHealth risk assessment and Sobol' sensitivity analysis of power plant air pollution (SO2 and NOX): the effect of power plant fuel change.
Integr Environ Assess Manag
January 2025
Department of Environmental Health Engineering, Faculty of Health, Shiraz University of Medical Sciences, Shiraz, Iran.
This study aimed to evaluate the concentrations of sulfur dioxide (SO2) and nitrogen oxides (NOX) around the Qom (a province in Iran) combined cycle power plant in relation to seasonal variations and fuel type from December 2014 to May 2015. Passive sampling was used in three monitoring sites around the power plant to assess noncarcinogenic health risks associated with exposure to SO2 and NOX. Results showed the higher concentrations of NOX and SO2 in winter than in spring.
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