کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1483402 | 1510510 | 2009 | 8 صفحه PDF | دانلود رایگان |

Nickel-modified carbon cryogel beads (Ni/CCBs) with uniform particle size were successfully prepared using the syringe injection method, employing sol–gel polycondensation of a resorcinol–formaldehyde (RF) solution containing Ni acetate as a catalyst. This process was followed by solvent exchange, freeze-drying and carbonization in a nitrogen atmosphere. The effect of viscosity, which increased as the sol–gel polycondensation progressed, of the RF solution on both the particle size distributions of the Ni/CCB and the porous properties was investigated. The influence of Ni content in the initial reactants on the porous properties of the Ni/CCBs was also studied. Monodisperse Ni/CCBs could be obtained by injection during the initial reaction period, before the steep increase in the viscosity of the RF solution. The porous properties of the Ni/CCBs were independent of the viscosity of the RF solution. The BET surface area, micropore volume and mesopore volume of Ni/CCBs decreased with increased Ni content, whereas the macropore volume increased with increased Ni content. The size of the Ni nanoparticles dispersed in the carbon matrix of Ni/CCBs was confirmed to range from 30 to 60 nm.
Journal: Journal of Non-Crystalline Solids - Volume 355, Issues 31–33, 1 September 2009, Pages 1605–1612