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Mcnt-Cooh Synthesis Lab Report

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Synthesis of MWCNT-COOH: Carboxylic acid-functionalized MWCNTs (MWCNT-COOH) were prepared following the literature [35]. Pristine MWCNTs were oxidized by a mixture of H2SO4/HNO3 at 70 °C for 3 h to prepare MWCNT-COOH. The resulting suspensions were then dialyzed for 3 days to remove all the salts and acids, and the purified MWCNT-COOH powder was collected by filtration and dried under vacuum. The MWCNT-COOH was redispersed in ethanol via sonication. Synthesis of OA-Fe3O4 NPs: OA-Fe3O4 NPs were prepared following the literature method [36]. For the synthesis of OA-stabilized Fe3O4 NPs, Fe(acac)3 (2 mmol), 1,2-hexadecanediol (10 mmol), oleic acid (5 mmol), oleylamine (6 mmol), and benzyl ether (20 mL) were mixed and magnetically stirred under …show more content…

For the synthesis of TOABr-stabilized Pd NPs with a diameter of ∼2.61 nm, an aqueous solution of 30 mM aqueous K2PdCl4 (30 mL) was first added to 25 mM TOABr in toluene (80 mL). Transfer of the K2PdCl4 from the aqueous phase to the toluene phase was observed within 1 min. A solution of 0.4 M NaBH4 (25 mL) was added to the reaction mixture. After 30 min, the separated aqueous phase was removed, and the toluene solution containing the reduced TOABr-Pd NPs was subsequently washed sequentially with 0.1 M H2SO4, 0.1 M NaOH, and H2O. Synthesis of Cationic-Pd NPs: Cationic Pd NPs were prepared as reported previously [32]. For the synthesis of cationic Pd NPs, an aqueous solution of 0.1 M 4-dimethylaminopyridine (DMAP) (80 mL) was added to the as-prepared TOABr-Pd NP toluene solution (80 mL). In this case, the Pd NPs were directly phase-transferred from toluene to the aqueous phase within 3 h, and the toluene phase was subsequently removed. The resulting Pd NPs were stabilized by cationic DMAP ligands in water (i.e., DMAP-Pd …show more content…

The solution was transferred to an autoclave, sealed, and maintained at 180 °C for 12 h, followed by washing with methanol. The OA-TiO2 NPs were isolated by centrifugation and dispersed in toluene. Synthesis of OA-Ag NPs: For the preparation of OA-stabilized Ag NPs [39], silver trifluoroacetate (0.4 g), OA (3.5 mL), and isoamyl ether (30 mL) were mixed in a 250 mL three-neck flask under argon. The mixture was heated at 160 °C for 30 min then cooled to room temperature by removing the heat source. The purification process was performed four times using excess polar solvent (ethanol) and centrifugation. The precipitated OA-Ag NPs were dispersed in

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