Size-tuneable synthesis of nickel nanoparticles

Size Control of Carbon Encapsulated Iron Nanoparticles by Arc Discharge Plasma Method

“…These results are in agreement with HRTEM observations. Similar trend and size dependency for iron saturation magnetization have been reported in the literature [47][48][49][50].…”

Ni/SiO2 catalyst prepared via Ni-aliphatic amine complexation for dry reforming of methane: Effect of carbon chain number and amine concentration

“…In short, the larger N c of the aliphatic amine, the higher possibility of the steric nature of the aliphatic amine to limit the uptake of the nickel nuclei into the nanoparticle core and prevent agglomeration [50,63], resulting in a smaller Ni particle formed after calcination and reduction; on the other hand, the higher C a of the amine, the faster nucleation rate of Ni, leading to a smaller Ni size [64]. These findings are also correlated with the quantitative size of NiO and Ni in Table 1 by using Scherrer equation [57].…”

“…2(A) and (B) displays the XRD patterns of reduced catalysts. The diffraction pattern exhibited one distinctive peak at 44.4 • 2Â degrees which was indexed to be the Ni(1 1 1) fcc reflection [50]. The wider the 2Â degrees on the Ni(1 1 1) peak, the smaller the particle size.…”

“…Due to less waste streams released and simpler operation [45], incipient wetness impregnation (IWI) method turns into a promising approach of preparing highly dispersed nanoparticles. Although non-uniform metal size distribution is an issue [44], we can use organic molecules to fix it, since organic molecules are well known for preparing metal nanoparticles as surfactants [46,47], ligands [48][49][50], or reducing agents [46,[51][52][53]. Among the various organic surfactants or ligands used, aliphatic amine-capped nanocrystals have been published in many literatures, such as oleylamine-capped copper nanocrystals [47], hexadecylaminecapped magnetic oxide nanocrystals [52] and methylamine-capped concave polyhedral platinum nanocystals [54].…”

“…Among the various organic surfactants or ligands used, aliphatic amine-capped nanocrystals have been published in many literatures, such as oleylamine-capped copper nanocrystals [47], hexadecylaminecapped magnetic oxide nanocrystals [52] and methylamine-capped concave polyhedral platinum nanocystals [54]. Also, aliphatic amines were applied in size control of nanocrystals due to different bulky property of their carbon chains [50]. The carbon chain numbers of selected aliphatic amines in this research are 2, 6, 12, 15, 18, which have been used to control the metal particle size [47,55,56], however, this is the first systematic study of the effect of the aliphatic amines on the size and MSI of supported Ni/SiO 2 catalysts synthesized by impregnating the Ni-amine complexes on the silica support; also the mechanism of how the aliphatic amines influence the particle size and MSI is proposed.…”