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Originally posted by 独孤残 at 2009-12-4 12:16:
我觉得银纳米粒子是带正点的，但柠檬酸钠应该是带负电，加一起就不知道了。

一般的基本上这种情况都是双电子层，也就是带正电的银颗粒外包裹一层柠檬酸根，也正是这种结构，使得颗粒比较稳定。貌似文献上都是这么解释的。也是为什么我现在搞不清楚颗粒带正电还是负电的原因

用粒度仪测Zeta电位.
未洗涤银为负电荷,洗涤后水分散表面带正电荷.

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Originally posted by 304297704 at 2009-12-10 14:37:
用粒度仪测Zeta电位.
未洗涤银为负电荷,洗涤后水分散表面带正电荷.

Are you sure about the declaration that after rinsing the Ag nanoparticles charged positively?? I have detected  Zeta Potential of Ag prepared in pure deionized water, the value is -20 ! Something wrong, the equipment? This is important to several of my papers. I hope you can give me some proofs about after rinsing, Ag nanoparticles charge positively.

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Originally posted by shikyang at 2009-12-10 16:19:


  Are you sure about the declaration that after rinsing the Ag nanoparticles charged positively?? I have detected  Zeta Potential of Ag prepared in pure deionized water, the value is -20 ! Some ...

不清楚你是怎样制备的,我得到的实验现象就是这样.改变浓度测多少次都是这样.其实我是希望其表面是负电荷.所以遇到这个问题,我自己都在想办法解决.我想向你请教:测Zeta电位时,你设定的物质参数都是多少?比如:Ag的折射率和吸收率.以及你的粒子粒径?

我也是默认的负电

没有zeta 啊

楼上两位谈论一下

洗涤之后  分散在水里

到底啥电性

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Originally posted by 304297704 at 2009-12-11 12:09:

不清楚你是怎样制备的,我得到的实验现象就是这样.改变浓度测多少次都是这样.其实我是希望其表面是负电荷.所以遇到这个问题,我自己都在想办法解决.我想向你请教:测Zeta电位时,你设定的物质参数都是多少?比如:Ag的 ...

I prepared Silver nanoparticles in pure deionized by laser ablation method, which is similar to a physical method. And when I detect the Zeto Potential, it is really -20. And when I apply an electric field, surprisingly, both on the anode and cathode have some Silver structures. It is strange! The parameters when detection the zeta potential is according to the equipment instrument
，