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• W3032172843 endingPage "375603" @default.
• W3032172843 startingPage "375603" @default.
• W3032172843 abstract "Herein, the desorption effect of supercritical CO2 (scCO2) was utilized to obtain sub-5 nm Ag nanoparticles (NPs) with a high Ag loading in SBA-15. The size of the Ag NPs decreased from 3.54 ± 0.79 nm (Ag loading of 25.3 wt.% wt.%) to 2.38 ± 0.68 (Ag loading of 10.5 wt%) nm by changing the depressurization curve from 0.1 MPa min−1 (20–14 MPa) to 3 MPa min−1 (20–12 MPa). Meanwhile, the intensity of the crystalline Ag characteristic peaks was obviously higher than the latter sample from the x-ray diffraction (XRD) patterns. However, compared with the adsorption kinetics of the two precursors of AgNO3 and Cu(NO3)2 on SBA-15, under the same deposition and depressurization conditions, when the two depositional systems used water as a co-solvent, the time taken to reach the adsorption equilibrium of Ag+ on the supports was longer than the time taken by Cu2+, which existed in the water as [Cu(H2O)4]2+. The surface of SBA-15 was hydrophilic, and then the interaction of Ag+ and the surface was weaker compared with Cu2+, making Ag+ highly dispersed on the surface under the scCO2 desorption effect. After calcination, the size of the Ag NPs decreased, but the morphology of CuO was mainly characterized by nanorods (NRs). Moreover, by comparing the experiments of wetness impregnation, the dispersion ability of the bulk scCO2 of the reactor was inefficient for Ag+ adsorbed on the channels in the depressurization process." @default.
• W3032172843 created "2020-06-05" @default.
• W3032172843 creator A5014058024 @default.
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• W3032172843 date "2020-06-30" @default.
• W3032172843 modified "2023-10-09" @default.
• W3032172843 title "Efficient synthesis of sub-5 nm Ag nanoparticles by the desorption effect of supercritical CO₂ in SBA-15" @default.
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• W3032172843 doi "https://doi.org/10.1088/1361-6528/ab96e7" @default.
• W3032172843 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32460263" @default.
• W3032172843 hasPublicationYear "2020" @default.
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