Zeta 0.8.1 Description:

Zeta is a small, simple, powerful and reliable software that can be used to calculate zeta potentials for ka>6 from electrophoretic mobilities measured at the stationary level, from apparent zeta potentials displayed by zetameter or from apparent mobilities measured at 3 different levels in a rectangular cell.

For electrophoresis at high zeta potentials and thick double layers additional braking forces must be considered. The force exerted on the particle by the excess of counterions moving in opposite direction is called retardation. Moreover, when the particle moves fast enough the centres of the particle charge and countercharge (diffuse layer) do not coincide and thus the effective electric field strength felt by the particle is lower than the external field (relaxation).

Accurate differential equations accounting for these effects have been published by O'Brien and White. These equations do not lead to accurate analytical expressions to calculate mobility from zeta potential. This problem can be solved numerically and desired accuracy can be achieved when the number of iterations is high enough. Commercial (and not open-source) programs Mobility and Winmobil are available from University of Melbourne. The solutions obtained by means of these programs are valid for any value of the zeta potential and kappa*a.

Why do we need Zeta when Mobility and Winmobil are available? For systems with kappa*a < 10 Zeta is useless. However in many systems with practical meaning 10 < kappa*a < 100 and here Zeta can help a lot (with kappa*a > 100 one can simply use Smoluchowski equation). With Mobility and Winmobil one can only calculate mobilities from zeta potentials as input data but it is mobility that can be experimentally determined. So the user has to select proper zeta potential values to cover the entire interesting range of mobilities, calculate mobilities for the selected zeta potentials and make a sort of calibration curve.

The final step is to read zeta potentials corresponding to the experimentally determined mobilities from this curve (manually or by means of some computer program).

With Zeta you simply introduce mobilities as input data and get zeta potentials as output data (no calibration curve is necessary). Unfortunately only for kappa*a > 10 the results will be reasonably accurate. This limit follows from the validity limit of the equation first published by Ohshima, H., Healy, T.W. & White, L.R., J.Colloid Interface Sci. 90, 17 (1982).

Many commercial zetameters have Smoluchowski equation built in the software, very often with the electric permitivity and viscosity data for water at 25 degrees Celsius so the results are displayed as (apparent) zeta potentials. When kappa*a < 100 the users of Winmobil need an additional step before reading from the calibration curve, namely they have to convert the apparent zeta potentials into mobilities. In Zeta, apparent zeta potentials calculated from Smoluchowski equation can be automatically converted into more accurate values if desired.

Zeta security information

You cannot download any crack or serial number for Zeta on this page. Every software that you are able to download on our site is legal. There is no crack, serial number, hack or activation key for Zeta present here. Our collection also doesn't contain any keygens, because keygen programs are being used in illegal ways which we do not support. All software that you can find here is freely downloadable and legal.

Zeta installation package is prepared to be downloaded from our fast download servers. It is checked for possible viruses and is proven to be 100% clean and safe. Various leading antiviruses have been used to test Zeta, if it contains any viruses. No infections have been found and downloading Zeta is completelly problem free because of that reason. Our experts on malware detection tested Zeta with various spyware and malware detection programs, including fyxm.net custom malware and spyware detection, and absolutelly no malware or spyware was found in Zeta.

All software that you can find on our servers, including Zeta, is either freeware, shareware or open-source, some of the software packages are demo, trial or patch versions and if possible (public domain licence), we also host official full versions of software.

Because we want to be one of the fastest download sites on the web, we host all the software including Zeta on our servers. You cannot find here any torrents or download links that would lead you to dangerous sites.

Fyxm.net does support free software, however we do not support warez or illegal downloads. Warez is harming producers of the software.

Enjoy!