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huikityy

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yinjuanchen

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Originally posted by huikityy at 2011-05-12 12:33:44:
The electrochemical behaviour of silver nanoparticles in
water solution was also analysed. Stripping voltammetry of
silver nanoparticles, in dissolution in an electrolyte solution,
was carried o ...

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2楼2011-05-12 17:55:48
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yinjuanchen

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Mally89(金币+1): 谢谢交流!~ 2011-05-12 19:11:49
huikityy(金币+20, 翻译EPI+1): 2011-05-12 20:09:16
The electrochemical behaviour of silver nanoparticles in water solution was also analysed. Stripping voltammetry of silver nanoparticles, in dissolution in an electrolyte solution,was carried out using a 25 µmdiameter platinum ultramicroelectrode. To detect silver (I) electrochemically at low concentrations, it is necessary to electrodeposit silver onto  the electrode surface in a pre-concentration step by holding the potential of the electrode at −0.3Vversus for 60 s [18]. This procedure reduces Ag+ to Ag0,which plates onto the electrode surface. When the potential is swept positively from −0.3to+0.35 V, the deposited silver is oxidized to Ag+ and stripped from the electrode, giving a characteristic stripping peak with a
height proportional to the concentration of Ag+ in the solution.
我们对银纳米颗粒在水溶液中的电化学行为也进行了分析。溶出电极测试使用直径为25mm的铂超微电极,纳米粒子溶解在电解质溶液中。为检测低浓度Ag+的电化学性质,需要将电极电势为-0.3VAg/AgCl 预浓缩60S[18],使电极表面镀上一层银。于是银离子从+1价还原为0价的银单质,富集在电极表面。 当电势差变化范围-0.3v至+0.35v时,富集在电极上的的银单质又被氧化为Ag+进入溶液,由此给出溶液中峰高与Ag+浓度成比例的特征峰。
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3楼2011-05-12 18:15:46
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chemistry2228

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Mally89(金币+1): 感谢交流!~ 2011-05-17 21:50:01
对水溶液中的银纳米粒子的电化学行为进行了研究,在电解质溶液中溶解银纳米颗粒,选用溶出伏安法研究银纳米颗粒,具体是选用25直径微米的铂金超微电极。为了测定低浓度的纳米颗粒,必须进行预处理,在电极Ag/AgCl电压−0.3V下用60秒将 银沉积到电极表面。这一过程将银镀到电极表面从而可以阻止其变为氧化银。当扫描电压从−0.3到+0.35 V时,沉积的银会被氧化为银离子,从电极上溶解下来,从而可以检测到银的特征溶出峰。
4楼2011-05-12 18:24:13
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yzbin1013

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Mally89(金币+1): 谢谢交流!~欢迎常来!~ 2011-05-12 19:12:17
水溶液中纳米级银微粒也要进行分析,使用直径25nm超微盘铂电极工具,采用溶出伏安法对在电解质溶液中溶解的银微粒进行分析。为了探索低浓度时的一价银离子的电化学性质,使银的自由电子转移到电极表面,控制电极电势-0.3V保持60秒(相对于Ag/AgCl电极)是非常必要。该过程使Ag+变为了单质银,在电极表面进行电镀。当电势从-0.3V变化到0.35V时,沉积的Ag被氧化为Ag+,Ag单质从电极脱落。会产生一个特征峰,该峰的高度与溶液中Ag+的浓度呈正比。
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5楼2011-05-12 18:28:26
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