Silver microflowers and large spherical particles: Controlled preparation and their wetting properties.
Silver microflowers and large spherical particles: Controlled preparation and their wetting properties.
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DOI：
10.1016/j.jcis.2007.03.058
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发表时间：
2007-07
影响因子：
9.9
通讯作者：
Wei Song;Huiying Jia;Q. Cong;Bing Zhao
中科院分区：
文献类型：
--
作者：
Wei Song;Huiying Jia;Q. Cong;Bing Zhao
在本文中，我们报道了一种简单的湿化学方法来制备银微花和大球形颗粒。银的两种不同微观结构的形成是基于室温下对苯二胺在水介质中还原AgNO_3。只有通过调节反应物的浓度，才能实现对银微观结构的控制。结果表明，两种不同的银微结构表现出相反的润湿性能。大的球形银粒子表现出超亲水性质，接触角接近0°，微花状的银粒子表现出高度的疏水性，接触角约132°。用X射线衍射仪(XRD)、X射线光电子能谱(XPS)和紫外可见光谱(UV-Vis)对所得产物进行了表征。
In this article, we report a simple wet-chemical method to prepare silver microflowers and large spherical particles. The formation of the two different microstructures of silver is based on the reduction of AgNO3by para-phenylenediamine in aqueous medium at room temperature. The controlling of the silver microstructures can be achieved only by adjusting the concentration of the reactants. It is found that the two different silver microstructures display opposite wetting properties. Large spherical silver particles exhibit superhydrophilic properties with a contact angle (CA) of close to 0°, microflower-like silver particles exhibit highly hydrophobic properties with CA about 132°. X-ray diffraction (XRD), X-ray photoelectron spectra (XPS) and UV–vis spectra are used to characterize the chemical structure of the obtained products.