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Photovoltaic Generator Based on Laser-Induced Reversible Aggregation of Magnetic Nanoparticles
摘要： A new principle of electromotive force generation is proposed, based on the intermittent laser-induced reversible cluster formation due to the aggregation of magnetic nanoparticles in a ferrofluid placed in the constant magnetic field. In such a configuration, according to Faraday law, in response to unsteady light-induced periodic motion of magnetized materials in an external magnetic field, an alternating current is induced in the coil wrapped around the ferrofluid tube.
关键词： Cluster Formation,Photovoltaic Generator,Laser,Faraday Law,Magnetic Nanoparticles
更新于2025-09-16 10:30:52
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Magnetic Hollow Spheres Assembled from Graphene-Encapsulated Nickel Nanoparticles for Efficient Photocatalytic CO2 Reduction
摘要： The exploitation of efficient, robust, and easily recyclable catalysts is highly desirable for photochemical CO2 reduction to produce fuels and chemicals. Herein, we demonstrate the preparation of Ni@GC magnetic hollow spheres composed of metallic Ni nanoparticles surrounded by few-layered graphitic carbon (GC) for photocatalytic CO2 reduction with high efficiency. The Ni@GC hollow spheres were prepared by thermal annealing a Ni-containing metal-organic framework (Ni-MOF) under N2 atmosphere. A series of physiochemical characterizations reveal that the Ni@GC hollow spheres are successfully synthesized with large surface area and highly porous structure. In the presence of Ni-C bonding, the porous Ni@GC material can efficiently accelerate the separation and transportation of photoexcited charges, as well as improve CO2 adsorption. With the cooperation of a ruthenium photosensitizer under visible light irradiation, the Ni@GC catalyst exhibits a high CO2-to-CO conversion activity, giving a superior CO-production rate of 27 μmol h-1 (e.g., 9.0 mmol h-1 g-1). Moreover, the Ni@GC photocatalyst is highly stable and can be separated easily by a magnetic field for reuse. The possible photosensitized CO2 conversion mechanism is also proposed based on the relative energy levels of the Ni@GC catalyst and the ruthenium photosensitizer.
关键词： magnetic nanoparticles,hollow spheres,graphene,photocatalysis,CO2 reduction
更新于2025-09-16 10:30:52
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[Methods in Molecular Biology] || Multifunctional Magnetic Nanoparticles-Labeled Mesenchymal Stem Cells for Hyperthermia and Bioimaging Applications
摘要： Magnetic nanoparticles have demonstrated considerable capacity for theranosis purposes due to their unique characteristics, including magnetic properties, comparable size to biomolecules, favorable conjugations of drugs and biomolecules, ability to labeling, and capability of sensing, separation, detection, and targeted drug delivery. They could be exploited in magnetic resonance imaging as the contrast agents and also warmed as exposed to an external magnetic AC ?eld that could be applied in hyperthermia. Here, progresses and advances in the strategy and assembly of ?uorescent magnetic nanoparticles are presented for stem cell tracing and drugs/biomolecules targeting into cells.
关键词： Conjugation,Fluorescent probe,Stem cell tracing,Magnetic resonance imaging,Magnetic nanoparticles,Hyperthermia
更新于2025-09-12 10:27:22
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Rapid immunofluorescence assay for staphylococcal enterotoxin A using magnetic nanoparticles
摘要： A competitive immunoassay for staphylococcal enterotoxin A (SEA) detection in milk was developed, using immobilised antibody onto magnetic nanoparticles (MNPs). MNPs were prepared and then modified to introduce amino groups on them. The morphology and size of the obtained both unmodified and modified MNPs were characterized using TEM analyses. Monoclonal anti-SEA antibody was immobilised onto the modified MNPs (MNP-Ab). Staphylococcal enterotoxin A was conjugated with fluorescent dye ATTO620NHS. The characteristics of fluorescence conjugate were examined. The amount of MNP-Ab and concentration of the fluorescent conjugate used for competitive immunoassay were optimized: 0.25 mg and 53 lg mL(cid:1)1, respectively. The detection limit of developed immunoassay was determined – 0.23 ng mL(cid:1)1 SEA in spiked milk samples. The immunoassay takes only 30 min, the magnetic separation is fast (<10 s) and the volume of the sample for analysis is very small (200 lL).
关键词： fluorescent conjugate,staphylococcal enterotoxin,milk,Antibody immobilisation,magnetic nanoparticles,immunofluorescence
更新于2025-09-09 09:28:46
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Fast dispersive liquid–liquid microextraction based on magnetic retrieval of in situ formed an ionic liquid for the preconcentration and determination of benzophenone-type UV filters from environmental water samples
摘要： This work concerns the development of a novel and rapid in situ dispersive liquid–liquid microextraction method for magnetic retrieval of ionic liquid as a new approach for the separation of benzophenone type (BP-type) UV filters via quantification using UPLC with PDA detection. The analytes determined in this study were a group of three benzophenones: 2,4-dihydroxybenzophenone (BP1), 2,2′,4,4′-tetrahydroxybenzophenone (BP2) and 2-hydroxy-4-metoxybenzophenone (BP3). The hydrophilic ionic liquid found suitable for use as an extraction solvent of the targeted analytes was didecyldimethylammonium chlorate (DDAC). An anion exchanger, NaClO4 was added to promote a metathesis reaction and in situ formed the IL, [DDA][ClO4]. The experimental parameters such as the concentration of IL, the molar ratio of DDAC to NaClO4, amount of iron oxide added and volume of water sample were investigated and optimised using a step-by-step optimisation process. The optimum experimental parameters were as follows: 30 mL of sample volume, 1% concentration of DDAC, the molar ratio of DDAC to NaClO4—1:2, and 5 mg of Fe3O4 magnetic nanoparticles. The proposed extraction method is simple and requires no more than 5 min. The detection limit (LOD) obtained for target analytes ranged from 12.320.0 ng L?1, while the correlation coefficient (r2) was from 0.9995 to 0.9999. Finally, the developed method was successfully applied to the determination of BP-type UV filters in environmental water samples, and satisfactory results were obtained.
关键词： In situ MR IL-DLLME,Ionic liquid,Benzophenones,BP-type UV filters,Magnetic nanoparticles
更新于2025-09-09 09:28:46
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Gold nanoparticles – an optical biosensor for RNA quantification for cancer and neurologic disorders diagnosis
摘要： The objective of this study is to develop a facile tool for the absolute detection and quantification of nucleic acid transcripts, using a gold nanoparticle-based optical biosensor. Topoisomerase 1 (TOP1) and tyrosyl DNA phosphodiesterase 2 (TDP2) were among the nucleic acid transcripts of choice due to their role as genomic instability biomarkers and their implication in various cancers and neurologic disorders. This opens the door to develop a simple tool that can be used for diagnosing and monitoring treatment response for such diseases, overcoming the requirements for high cost, time, and complexity of the existing technologies for the absolute quantification of transcripts of interest.
关键词： RNA extraction,genomic instability,tumor markers,gold aggregating gold,TDP2,TOP1,neurodegenerative diseases,magnetic nanoparticles
更新于2025-09-04 15:30:14