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首页> 外文期刊>Applied Surface Science >Desorption of surfactant and sintering of surface-modified PdxNi1-x nanoparticles
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Desorption of surfactant and sintering of surface-modified PdxNi1-x nanoparticles

机译：表面活性剂的解吸和表面改性的PdxNi1-x纳米粒子的烧结

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A series of PdxNi1-x nanoparticles in a diameter of 6-7 nm were prepared by wet chemical reduction. They were then modified with two surfactants, stearic acid (SA) and polyethylene glycol (PEG). Desorption of the surfactant was studied using a temperature programmed desorption technique, and the sintering behavior of surface-modified PdxNi1-x nanoparticles was examined. Since surface energy of the nanoparticles depends on the alloy composition, it can be correlated with the desorption temperature of surfactant from the nanoparticle surface. Because Ni has a higher surface energy, the surfactant desorption temperature increases as the Ni content increases. With the same stoichiometry, the desorption temperature of SA is always higher than that of PEG. The SA-modified nanoparticles have higher thermal stability and are less sintered than PEG-modified nanoparticles. The sintering and growth behavior of the nanoparticles can be correlated with variation of surface energy due to different surface modification. (c) 2006 Elsevier B.V. All rights reserved.
机译：通过湿化学还原制备了一系列直径为6-7 nm的PdxNi1-x纳米颗粒。然后用两种表面活性剂硬脂酸（SA）和聚乙二醇（PEG）进行改性。使用程序升温脱附技术研究了表面活性剂的脱附，并研究了表面改性的PdxNi1-x纳米粒子的烧结行为。由于纳米颗粒的表面能取决于合金组成，因此它可以与表面活性剂从纳米颗粒表面的解吸温度相关。因为Ni具有较高的表面能，所以表面活性剂的解吸温度随着Ni含量的增加而增加。在相同的化学计量比下，SA的解吸温度始终高于PEG。 SA改性的纳米粒子比PEG改性的纳米粒子具有更高的热稳定性，并且烧结较少。由于不同的表面改性，纳米颗粒的烧结和生长行为可以与表面能的变化相关。 （c）2006 Elsevier B.V.保留所有权利。

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