Mike Devour wrote: >Ivan!! I'm so glad to hear this from someone else. <GRIN> I have a >hunch that it'll be a *lot* cheaper to hire somebody's UV/visible >spectrophotometer than to put dozens of samples through the electron >microscope. Microscopy can double check the correlation between >absorption and particle size distribution. Then use UV-spec on the >bulk of samples to explore particle size distribution vs. process >variables.
>Find us an inexpensive method for measuring concentration and we're >on our way! <g> Yes indeed! I have my doubts about electron microscope measurement. I know that the EM technicians dont much like scanning CS because of the amount of preparation required. I think the sample needs to be filtered and dried in some manner and I wonder if this process alters the particle aggrigation and range. Colorimetry seems to be an inexpensive method for measuring concentration, although a cell requiring a reagent is needed. About US$300 for an automatic hand held model (tripple that in NZ$). Most use ca. 420nm filters to measure Ag. Merc have a model with which a test strip that has been immersed in the sample is read electronically NZ$ 4,000. There are some zeta potential meters, I notice, which also measure particle size by Stokes-Einstein eqn to light scattering electrophoresis, ultrasonic, acoustic measuring equiment etc. etc., its going to take some serious study to put this all into perspective, and you are just the man for the job ; ) >Welcome aboard, my man! This is going to be fun. >Mike D. Thanks, I think. Ivan -- 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: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] List maintainer: Mike Devour <[email protected]>
