Interesting; two axes here, freq and strength (as distance per impact?) Another possible effect is outlined in Science News, Aug 24, p116 where simple diffusion as exemplified by a 'random walk' model is modified. The experimenters 'added a so-called "drift term" to the classic equation for diffusion.' The drift term was essentially a complex term of attraction between particles, based in part on distance between individuals, in part on concentrations of particles, and on other factors. Below a certain value, random distribution ensues but above it an increasingly powerful tendency to aggregate takes place, often forming what statisticians call a 'fat - tailed distribution' or grouping. This sort of grouping is empirically found in examples of data from bird populations, national economic productivity, and stock prices. Perhaps there would be a 'drift away' term for mutually repelling particles that would be effective at some powers but overwhelmed by impact agglomeration at other excursions or velocities? Original report in Aug 19 Physical Review Letters, J. R. Banavar.
Malcolm Marshall Dudley wrote: > Interesting. Since we know that browning movement is involved in the > aggregation of particles, I would suspect that ultrasonic vibrations would do > the same thing if sufficiently strong enough. But testing would have to be > done > to be sure. > > Marshall > > [email protected] wrote: > > > As a user of the pulsed d.c. method of cs generation,I have recently become > > curious as to any beneficial effect of ultrasound frequencies applied to the > > colloidal process. > > My initial reasoning was related to the effect called cavitation,wherein > > microscopic pressure "bubbles" (as utilised in ultrasonic cleaning) greatly > > assist surface cleansing..a "scrubbing action",if you will. > > Now,would using such a system during the making of cs speed up the > > process,and,is there an optimum frequency range? > > Apparently,higher ultrasound (~350kHz) dislodges smaller particles than a > > lower ultrasound (eg 100kHz) during ultrasonic cleaning.Hence could one > > optimise the applied ultrasound frequency to the colloid generation for the > > desired particle size(s)? > > Hey,what if the silver electrodes themselves are pulsed at this ultrasonic > > frequency? > > I had a glance on the net enough to realise the scientific research is > > somewhat beyond me,hence my question to the list..Is anyone else pursuing > > this line of inquiry? > > petemc > > > > -- > > The silver-list is a moderated forum for discussion of colloidal silver. > > > > Instructions for unsubscribing may be found at: http://silverlist.org > > > > To post, address your message to: [email protected] > > > > Silver-list archive: http://escribe.com/health/thesilverlist/index.html > > > > List maintainer: Mike Devour <[email protected]>
