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qzhaoxia

铜虫 (小有名气)

[交流] 【请教】zeta potential测量 已有3人参与

The zeta potential of my sample should be around zero(the surface of my sample is supposed to be neutral or slightly positively charged), however, the measurement result I got is about -30mV, which is too much off. I repeated the measurement, but the result was similar. Since I'm not so experienced in measuring zeta potential, does anyone can do me a favor by providing possible explanations? Thanks very much!
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liudb

木虫 (著名写手)

qzhaoxia(金币+1):Thanks very much! 2010-10-05 05:05:39
The 2ed flour is riight, zeta potentials are highly dependant on the pH value of solution in whiich your materials are dispersed.
谦虚、谨慎、得体
3楼2010-10-02 23:15:18
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charley86577

至尊木虫 (职业作家)

qzhaoxia(金币+1):Thanks very much! 2010-10-05 05:05:22
why do you think that the zeta potential of your sample should be zero?

The zeta potential have strong relationship with the pH of the solution.
keepeyesontheclouds,keepfeetfirmlyontheground
2楼2010-10-02 20:27:08
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markyhoo

金虫 (小有名气)

qzhaoxia(金币+1):Thanks! 2010-10-05 05:05:49
Please measure it in a definite pH value and ionic strength
4楼2010-10-03 00:43:49
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keven7928

至尊木虫 (知名作家)

水手


小木虫(金币+0.5):给个红包,谢谢回帖
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2楼: Originally posted by charley86577 at 2010-10-02 20:27:08:
why do you think that the zeta potential of your sample should be zero?

The zeta potential have strong relationship with the pH of the solution.

您好!pH对Zeta potential的影响是怎么样的?能否给介绍一下,另外Zeta potential的测定必须在水溶液中进行吗?其中还有少量有机溶剂可否?多谢!
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5楼2011-09-12 15:26:29
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