Synthesis of highly monodisperse Pd nanoparticles using a binary surfactant combination and sodium oleate as a reductant

Abstract

Palladium nanoparticles (NPs) are relevant for a broad range of applications such as sensing and catalysis. This study presents the synthesis of monodisperse Pd nanoparticles (NPs) stabilized by sodium oleate...

Just Soaping Them: The Simplest Method for Converting Metal Organic Frameworks into Superhydrophobic Materials

“…In contrast to several known PSM methods that are effective only in MOFs bearing linkers with specific functional groups, ,,, this method is applicable to MOFs with a variety of metal ions and linkers. Moreover, in our approach, superhydrophobicity is conferred by ligation of oleate ions, an inexpensive, widely available, and low-toxicity organic substance. − The estimated cost for the conversion of UiO-66 into a superhydrophobic material, considering the retail price of crude sodium oleate (purity ≥82%, cost ≈58 €/kg) and the negligible solvent and energy costs (as the process takes place in aqueous solutions and ambient temperature for only 90 min), is calculated approximately 4 € per kg of MOF. In contrast, other methods involve the use of costly and/or toxic materials such as perfluorinated agents, phosphate-containing surfactants, polymer coatings etc., or require specialized equipment and synthetic conditions. ,,,− , Therefore, the above comparison demonstrates that the method described here is widely applicable and probably the “greenest” and least expensive method ever described for the conversion of MOFs into superhydrophobic materials.…”

“…Sodium oleate is particularly cost-effective since it can be readily prepared by neutralizing free oleic acid or saponifying triglycerides . In addition, it exhibits low toxicity and no carcinogenic effects. , Oleate anion is an excellent ligand for metal ions, coordinating to them through its carboxylate group, , and has been widely used as capping agent for metal nanoparticles. − Considering all above features of sodium oleate, it appears to be an ideal reagent for modifying the wetting properties of MOFs through a straightforward and affordable route involving coordination of metal centers with the powerful oleate ligand. It is anticipated that sodium oleate could effectively transform most MOFs into hydrophobic/superhydrophobic materials, regardless of the type of metal ion, ligand, or metal coordination environment.…”

The Effect of the Pd Precursors on the Shape of Hollow Ag–Pd Alloy Nanoparticles Using Ag Nanocubes as Seeds

“…This result is supported by our previous efforts identifying the shortcomings of the colloidal stability of nanoparticles in the presence of CTAC/NaOL binary solution, which revealed that the stoichiometry of cationic and anionic surfactants is crucial for nanoparticle morphology control. 23,34 ■ CONCLUSIONS In this work, hollow Ag−Pd alloy nanodendrites and nanoboxes were synthesized successfully by using H 2 PdCl 4 and Pd(acac) 2 , respectively, as precursors. It illustrates that the type of precursors influences the shape of final nanoparticles.…”

“…In the presence of a mixture of NaOL and halide ions, substantial shape degradation of the nanocube seed morphology was observed with concomitant formation of small nanoparticles, as shown in Figure S6 of the ESI. This result is supported by our previous efforts identifying the shortcomings of the colloidal stability of nanoparticles in the presence of CTAC/NaOL binary solution, which revealed that the stoichiometry of cationic and anionic surfactants is crucial for nanoparticle morphology control. , …”

“…This result is supported by our previous efforts identifying the shortcomings of the colloidal stability of nanoparticles in the presence of CTAC/NaOL binary solution, which revealed that the stoichiometry of cationic and anionic surfactants is crucial for nanoparticle morphology control. 23 , 34 …”