Dispersion Behavior of Al2O3 and SiO2 Nanoparticles in Nickel Sulfamate Plating Baths of Different Compositions
Dispersion Behavior of Al2O3 and SiO2 Nanoparticles in Nickel Sulfamate Plating Baths of Different Compositions
复制标题
Al2O3和SiO2纳米颗粒在不同成分氨基磺酸镍镀液中的分散行为
DOI：
10.1149/1.1885286
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发表时间：
2005
影响因子：
3.9
通讯作者：
H. Ferkel
中科院分区：
文献类型：
--
作者：
G. Vidrich;J.;H. Ferkel
采用Zeta电位法和光子相关光谱法研究了纳米Al2O3和SiO2在不同组成的氨基磺酸镍镀液中的分散行为。Al2O3颗粒的中位直径为25 nm，晶化为δ-和γ-相。无定形SiO2颗粒的中位直径为7nm。在分散体与Al 2 O 3颗粒的情况下，它被发现由PCS，其附聚的倾向随着增加浴中的离子浓度，因此定性地服从Delaguin-Landau-Verwey-Overbeek（DLVO）理论。相同电解质中的SiO2颗粒表现出不同的行为：在特定的离子浓度下，零电荷点（等电点）向更高的pH值移动。在研究的最高离子浓度下，颗粒电荷测量返回约+15 mV的ζ电位值，甚至在pH值高达6时也更高。这一结果可以用Ni2+离子在SiO2颗粒表面的吸附来解释。PCS在此分散揭示了低团聚的二氧化硅纳米粒子在所采用的电镀浴。并对结果进行了讨论。
The dispersion behavior of Al 2 O 3 and SiO 2 nanoparticles in nickel sulfamate plating baths of different compositions were investigated by Zeta potential measurements and photon correlation spectroscopy (PCS). The Al 2 O 3 particles have a median diameter of 25 nm and are crystallized in the δ- and γ-phase. The amorphous SiO 2 particles have a median diameter of 7 nm. In the case of dispersions with Al 2 O 3 particles it was found by PCS that their agglomeration tendency increases with increasing ion concentration of the bath and therefore obeys qualitatively the Delaguin-Landau-Verwey-Overbeek (DLVO) theory. SiO 2 particles in the same electrolytes show a different behavior: At a specific ion concentration the point of zero charge (isoelectric point) is shifted to higher pH values. At the highest ion concentration investigated, the particle charge measurements returned zeta potential values of about +15 mV and higher even at pH values up to 6. This result could be explained by an adsorption of Ni 2 + ions on the SiO 2 particle surface. PCS at this dispersion reveals low agglomeration of the SiO 2 nanoparticles in the employed plating bath. The results are discussed.