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首页> 外文会议>International Conference on Surface and Colloid Science; 200309; Brazil >More reliable zeta potentials using electroacoustics
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More reliable zeta potentials using electroacoustics

机译：使用电声更可靠的Zeta电位

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The traditional methods of determining zeta potentials (particle electrophoresis, streaming potential and electroosmosis) all suffer from real drawbacks in the matter of reliability. Measurements on very dilute systems (using, say, microelectrophoresis) are prone to contamination problems, but even when the direct current mobility is accurately assessed, current estimates of zeta potentials can be in error by as much as 100% or 100 mV in the most unfavourable cases. Electroacoustics overcomes the contamination problem by allowing measurements at significant particle concentrations. The simultaneous measurement of both size and zeta potential, using the elec-troacoustic spectroscopy technique, means that the correct average size is used for estimating zeta in polydis-perse systems. Use of the entire mobility spectrum, over a range of frequencies, allows one to avoid the ambiguities which can occur with a single point (direct current) measurement. One can also take account of the effects of stagnant layer conduction, either by undertaking simultaneous measurements of the dielectric relaxation behaviour at high frequency or, more simply, by doing a salt titra-tion from low ionic strength to concentrations where the effect of stagnant layer conduction is negligible.
机译：确定ζ电势（颗粒电泳，流动电势和电渗）的传统方法在可靠性方面都存在真正的缺陷。在非常稀的系统上进行的测量（例如使用微电泳）容易出现污染问题，但是即使准确地评估了直流迁移率，当前对ζ电势的估计在最大范围内也会有高达100％或100 mV的误差。不利的情况。电声通过允许在显着的颗粒浓度下进行测量而克服了污染问题。使用电声光谱技术同时测量尺寸和Zeta电位，意味着使用正确的平均尺寸来估算多分散系统中的Zeta。在一定频率范围内使用整个迁移谱，可以避免单点（直流）测量可能出现的歧义。人们也可以考虑停滞层传导的影响，方法是同时测量高频下的介电弛豫行为，或者更简单地，通过从低离子强度到停滞层影响的浓度进行盐滴定传导微不足道。

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