Effects of Reactant Mixing Mode on Dispersibility and Particle Size Stability of Cuprous Oxide Particles

doi:10.3724/SP.J.1077.2012.00195

Abstract

Abstract:

Spherical Cu₂O particles were prepared under high reaction concentration and without any additives using CuSO₄, NaOH, and glucose as raw materials. The products were characterized by XRD, SEM and smileview software. The effects of reactant mixing modes on dispersibility and size stability of Cu₂O particles were investigated. It is found that when Cu(OH)₂ was prepared by slowly mixing NaOH and CuSO₄ solutions at first step, and then reduced by adding glucose solution at second step, Cu₂O particles were formed by so-called “rapid nucleation- slow growth” model, and well-dispersed spherical Cu₂O particles with stable particle size were prepared. The good dispersibility of Cu₂O particles can be explained by the slow growth of Cu₂O particles, which allows the soft agglomeration of Cu₂O particles to be broken by stirring and prevented from becoming hard agglomeration through chemical bond between crystal nuclei. The good particle size stability can be explained by good thermal stability of Cu(OH)₂ which allows the precursor to keep oneness during heating up and prevents the renucleation in the reduction.

Key words: cuprous oxide powder, glucose reduction, dispersibility, particle size control

CLC Number:

TQ131

WANG Yue-Jun, ZHOU Kang-Gen, JIANG Zhi-Gang. Effects of Reactant Mixing Mode on Dispersibility and Particle Size Stability of Cuprous Oxide Particles[J]. Journal of Inorganic Materials, 2012, 27(2): 195-200.

Figures/Tables 8

Fig. 1 SEM images of Cu2O particles prepared by different reactant mixing modes

Table 1 Particle diameter of different Cu2O particles prepared by reactant mixing mode iii

Cu₂O particles	Diameter /μm	Standard deviation
a	0.85	0.231
b	0.75	0.211
c	1.35	0.230

Table 2 Particle diameter of different Cu2O particles prepared by reactant mixing mode iv

Cu₂O particles	Diameter /μm	Standard deviation
a	1.25	0.093
b	1.29	0.094
c	1.32	0.061

Fig. 2 SEM images and particle size (a, b, c) for different tests distribution of Cu2O powders prepared by reactant mixing mode iii

Fig. 3 SEM images and particle size (a, b, c) for different tests distribution of different Cu2O prepared by reactant mixing mode iv

Fig. 4 XRD pattern of Cu2O powders prepared in the experiments

Fig. 5 Lamer modle of nucleation and growth dependences with concentration[21]

Fig. 6 Concentration dependences of nucleation and growth rates[21], where V is the total volume of the precipitate[21]

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