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納米鉍粉在正辛烷溶液中分散穩(wěn)定性研究
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Study on the Dispersion of Nano-Sized Bismuth Powders in Octane Solvent
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National Natural Science Foundation of China (10502025); Natural Science Foundation of the Jiangsu Higher Education Institutions of China(05KJB1300421); The Torch Plans of Jiangsu(H2007306)

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    摘要:

    選用油酸(OA)、硬脂酸(SA)和12-羥基硬脂酸(HAS) 3種脂肪酸在正辛烷溶液中分散納米鉍粉。用紫外可見光分光光度計(jì)表征了脂肪酸修飾后的粉體在正辛烷溶液中的分散穩(wěn)定性。結(jié)果表明：3種脂肪酸都能將粉體表面改性成Bi-脂肪酸型疏水性表面；懸浮液的分散穩(wěn)定性隨著分散劑在粉體表面吸附量的增多而增強(qiáng)，12-羥基硬脂酸在納米鉍粉表面吸附量最大，其懸浮穩(wěn)定性最好；脂肪酸對懸浮液的穩(wěn)定機(jī)制是，不僅能減小粉體間的范德華吸引力而且能產(chǎn)生一定的空間位阻作用

    Abstract:

    Three types of fatty acids—oleic acid, stearic acid, and 12-hydroxystearic acid—were used to disperse nano-sized bismuth powders in octane solvents. The surface characteristics of bismuth powders were modified to be hydrophobic in nature, and the bismuth-fatty acid formed on the surface. Stability property of the suspension was measured by ultraviolet-visible spectrophotometer. Results indicate that better suspension stabilization can be achieved when the 12-hydroxystearic acid is used. Adsorption behavior reveals that a greater affinity at the solid/liquid interface occurred for the 12-hydroxystearic acid than that for stearic acid or oleic acid. This observation suggests that the adsorption of 12-hydroxystearic acid may lead to a better packing of the acid molecules onto the solid surface than others and also results in better suspension stability. It is also evidenced by the results of theoretical calculation of potential energies that the colloidal stability of organic bismuth suspension is caused by fatty acid reducing the attractive interparticle potential and by steric repulsion mechanism

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楊江海,張振忠,趙芳霞,江成軍.納米鉍粉在正辛烷溶液中分散穩(wěn)定性研究[J].稀有金屬材料與工程,2010,39(4):582~586.[Yang Jianghai, Zhang Zhenzhong,,Zhao Fangxia, Jiang Chengjun. Study on the Dispersion of Nano-Sized Bismuth Powders in Octane Solvent[J]. Rare Metal Materials and Engineering,2010,39(4):582~586.]
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  • 收稿日期:2009-04-13
  • 最后修改日期:2010-03-18
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