ZnS nanoparticles were precipitated in aqueous dispersions of cationic surfactant cetyltrimethylammonium bromide (CTAB). The sphere radii of ZnS nanoparticles calculated by using band-gap energies steeply decreased from 4.5 nm to 2.2 nm within CTAB concentrations of 0.4-1.5 mmol L(-1). Above the concentration of 1.5 mmol L(-1), the radii were stabilized at R=2.0 nm and increased up to R=2.5 nm after 24 h. The hydrodynamic diameters of CTAB-ZnS structures observed by the dynamic light scattering (DLS) method ranged from 130 nm to 23 nm depending on CTAB concentrations of 0.5-1.5 mmol L(-1). The complex structures were observed by transmission electron microscopy (TEM). At the higher CTAB concentrations, ZnS nanoparticles were surrounded by CTA(+) bilayers forming positively charged micelles with the diameter of 10nm. The positive zeta-potentials of the micelles and their agglomerates were from 16 mV to 33 mV. Wurtzite and sphalerite nanoparticles with R=2.0 nm and 2.5 nm covered by CTA(+) were modeled with and without water. Calculated sublimation energies confirmed that a bilayer arrangement of CTA(+) on the ZnS nanoparticles was preferred to a monolayer.
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http://dx.doi.org/10.1016/j.jcis.2012.03.073 | DOI Listing |
Background: Ciprofloxacin is a widely used antibiotic in medicine and agriculture. It can cause pollution to the environment and food, thereby affecting human health.
Objective: This study proposes the preparation of molecular imprinted fluorescent sensors and their selective detection of ciprofloxacin, with the aim of achieving specific recognition and accurate detection of ciprofloxacin.
Sci Bull (Beijing)
November 2024
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China. Electronic address:
Excess intracellular HS induces destructive mitochondrial toxicity, while overload of Zn results in cell pyroptosis and potentiates the tumor immunogenicity for immunotherapy. However, the precise delivery of both therapeutics remains a great challenge. Herein, an electrically activable ZnS nanochip for the controlled release of HS and Zn was developed for enhanced gas-ionic-immunotherapy (GIIT).
View Article and Find Full Text PDFJ Fluoresc
December 2024
Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt.
Chem Sci
November 2024
Department of Biomedical Engineering, College of Engineering and Applied Sciences, Nanjing National Laboratory of Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing University Nanjing Jiangsu 210023 China
Copper homeostasis is crucial for cells, especially for rapidly proliferating cancerous cells. Copper imbalance-induced cell death (, cuproptosis) has emerged as a new strategy for tumor therapy. While copper accumulation-induced cuproptosis has been extensively investigated and its underlying mechanism recently elaborated, copper depletion-induced cuproptosis remains largely unexplored.
View Article and Find Full Text PDFRSC Med Chem
November 2024
Department of Chemistry, Christ University Hosur Road Bangalore Karnataka 560029 India
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