----- Original Message ----- From: Fred <f...@health2us.com> To: <silver-list@eskimo.com> Sent: Thursday, 9 December 1999 07:28 Subject: Re: CS>RE:Particle size -LV and HV
> Ivan, > > I appreciate your addition to this complex problem (the more to > consider the better the analysis), but must question your last paragraph: Thanks. I am working back through the mail, there are a few I would like to comment on, or seek clarification about. > "There is no doubt that HVAC silver sols are ionic, in that the > particles carry a charge, as can be easily attested by a conductivity > reading." > > Conductivity and charge are not solidly related, from what I have seen, > specifically "a new deionizer cartridge (resin bed) with activated (fine) > charcoal particles will make DW a dark and highly conductive > suspension, with a steady falloff of conductivity as the particles settle". > Is not a charcoal suspension the same as a metallic crystal suspension? Activated charcoal is a complex composition of mainly carbon and some minerals etc. The particles are very large compared to silver colloids and are probably charged to some degree. Would be interesting to put some dc electrodes in the water and see whether they drift towards one of them. Do metallic (neutral) suspensions give a conductivity reading? > Comments? and did you check if 'Zeta Potential' equipment is available > to you? Yes I have posted on Zeta Potential a few times. The only use for this reading in a mono-dispersed suspension is to measure whether the particles are charged or not and whether the particles have lost one or more electrons. To check this one can measure the mV between 2 probes in the solution. In multi-dispersed suspensions the zeta potential can give important data about the interaction between different particle types and alows the adjustment of properties to be measured. The commercial method of measuring ZP is by particle travel speed towards an electrode and can also provide particle sizing down to about 2 nm which I would be more interested in, If I had the readies. Try this for a discussion of ZP measurement: http://reliant.pharm.nottingham.ac.uk/zeta.html -- 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...@id.net>
