Fabrication Of Palladium Nanoparticles Research Articles

Fabrication of palladium nanoparticles as effective catalysts by using supramolecular gels

Abstract Two-component supramolecular gels were made through self-assembly of tetrazolyl derivatives and Pd(OAc)2. The robust gels indicated high storage modulus (>10,000 Pa) and loss modulus, which were studied by rheological measurements. The formed Pd nanoparticles (∼9 nm) obtained during the formation of the gel showed effective catalytic hydrogenation of nitrobenzene and could be recovered and reused without loss of activity.

Fabrication of Palladium Nanoparticles by Laser Ablation in Liquid

Laser ablation of a palladium disc target immersed in heavy water or light water using second harmonic Nd:YAG laser was carried out to fabricate palladium nanoparticles. The properties of palladium nanoparticles ablated in heavy water or light water were investigated and compared. It is shown that liquid with smaller optical absorption coefficient improve the yield of nanoparticles. The transmission electron microscopy observation revealed that palladium nanoparticles with a diameter range from a few nm to several tens of nanometer were produced in light water while the average diameter of palladium nanoparticles produced in heavy water was smaller. Magnetic properties of palladium nanoparticles were also measured. M-H curves show palladium nanoparticles were superparamagnetic. Furthermore, laser ablation in heavy water or light water causes larger magnetic susceptibility than commercial palladium powder and plate. Keyword : Palladium nanoparticle, laser ablation, magnetic susceptibility

Multifunctional Fourfold Interpenetrating Diamondoid Network: Gas Separation and Fabrication of Palladium Nanoparticles

A fourfold interpenetrating diamondoid network, [{[Ni(cyclam)]2-(mtb)}(n)].8n H2O.4n DMF (1) (MTB=methanetetrabenzoate, DMF=dimethylformamide), has been assembled from [Ni(cyclam)][ClO4]2 (cyclam=1,4,8,11-tetraazacyclotetradecane) and methanetetrabenzoic acid (H4MTB) in DMF/H2O (7:3, v/v) in the presence of triethylamine (TEA). Despite the high-fold interpenetration, 1 generates 1D channels that are occupied by water and DMF guest molecules. Solid 1, after removal of guest molecules, exhibits selective gas adsorption behavior for H2, CO2, and O2 rather than N2 and CH4, suggesting possible applications in gas separation technologies. In addition, solid 1 can be applied in the fabrication of small Pd (2.0+/-0.6 nm) nanoparticles without any extra reducing or capping agent because a Ni II macrocyclic species incorporated in 1 reduces Pd II ions to Pd 0 on immersion of 1 in the solution of Pd(NO3)2.2H2O in MeCN at room temperature.