As I understand it Frank, the actual measurement is of the eletrophoretic movement of the particle, the light being the method of following the movement. Is it not true that at small particle size, it is not the particle that is measured, but the interface between the different refractive indexes of the bulk solution and the hydrating layer surrounding the particle, and that the extrapolation to particle size relies on a rather complicated series of assumptions, and an understanding of the properties of the particle under observation and the environment in which it is found.
Have you thought to use a 20nm and 100nm syringe filters (such as manufactured by Whatman) to correlate your results. Ivan ----- Original Message ----- From: "Frank Key" <fr...@strsoft.com> To: <silver-list@eskimo.com> Sent: Friday, 30 March 2001 04:37 Subject: Re: CS>Commercial Product Reports > Ivan wrote: > > > > Another question. Would not the large percentage of ions to particles > > have an effect upon the Zeta potential measurement, and if so, would > > this not affect this and therefore also the particle size determination? > > In a PCS, size and zeta potential are determined by measuring scattered laser light. Since ions are invisible and do not reflect light, they do not interfere with either measurement. > > frank key --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.240 / Virus Database: 116 - Release Date: 24/03/2001 -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: silver-list-requ...@eskimo.com -or- silver-digest-requ...@eskimo.com with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: silver-list@eskimo.com Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <mdev...@eskimo.com>
