Important Parameters in Production of Saturated Colloidal Ionic Silver Dispersions

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Several years back I got interested in the properties of properly made colloidal (ionic) silver dispersions. First samples I got proved to be efficient in eradicating mould, reducing clothes and shoes odour and in general in proved to be efficient in eradicating microbes. However, I fast noticed that the results sometimes significantly varied between different samples produced according to different described production procedures.

I was curious to learn which parameters were important in determining effectiveness of the colloidal ionic silver dispersion and in which way production process methodology affected quality and consequent effectiveness of the end product. As starting point I had numerous internet resources at disposal. It fast became evident that a lot of presented data is contradictory and even self-conflicting.

In order to determine which statements are factual and which are just conjectures, I performed a number of experiments. My goal was to determine which methods of production end up with useful dispersion and which do not. After great deal of experimenting I was beginning to understand which parameters are important for production of very high concentration of silver ion cations (Ag+) and which parameters are only marginally important. As it turns out, purity and temperature of water, shape, surface and size of electrodes and geometry of fluid flow are all important contributing factors in production of saturated colloidal ionic silver containing high content of silver ions.

Additionally, appropriate laboratory and measurement equipment have to be used if one is to employ appropriate electrical signal and maintain precise control of the dispersion production process in order to prevent contamination of dispersion or its agglomeration. When sufficiently precise measurements of several physical parameters are made continuously then saturation curve of dispersion in time domain can be observed. It is then possible to dynamically adjust rate of processing and eventually stop it just prior to point of agglomeration. Reaching high concentration values of up to 20 ppm of silver particles (mostly Ag+) is then achievable even with some of the conventional equipment if appropriate production methodology is observed. However, in case of most of conventional colloidal ionic silver production equipment, making such saturated dispersions comes at the expense of significantly longer processing time.

It soon became apparent that in order to produce high quality colloidal ionic silver dispersion, in as short amount of time as possible, appropriate methodology and hardware would have to be developed. Preliminary results during our on-going research and development in that direction yielded dispersions with extremely high concentration of silver particles of up to 20 ppm.

Even taking into account inaccuracies and non-linearity of the measuring process and equipment, some of the observed physical properties of saturated dispersion provide circumstantial evidence that indeed such high saturation is possible. For example, often it can be observed that high concentration dispersions are sometimes so saturated that although they appear stable, sometimes all it takes is some external stimulus to destabilise them to the point of agglomeration. For example, brief exposure of such saturated colloidal ionic silver dispersions to sunlight or change in temperature of just 2-3 °C often causes sudden agglomeration. Agglomeration usually happens momentarily and the very moment it happens it renders produced dispersion useless for any practical medicinal purposes.

By carefully observing all relevant parameters and with the developed methodology, I was able to reliably produce stable, saturated colloidal ionic silver dispersions. Based on gained experience, we are currently considering development of the manufacturing equipment capable of comparatively faster production of high quality, saturated colloidal ionic silver dispersions with high content of silver cations (Ag+).

Numerous simple experiments I performed with different yeasts and moulds confirmed that indeed almost linear relationship exists between saturation level of dispersion and observed bioactive effects (death of yeast and mould samples). Saturated colloidal ionic silver dispersion virtually always yielded better results compared to less saturated dispersions.

It also became apparent that saturated dispersions are more sensitive to light compared to low saturation dispersions and it is best to store them in dark glass containers in order to postpone eventual agglomeration. Saturated colloidal ionic silver dispersions are also increasingly unstable and tend to agglomerate with the rising temperature so it is best to store them in cool places. Given the fact that density of water is at its maximum ~4°C, one could assume that as the storage temperature nears the region of highest density, the potential for agglomeration of the dispersion would rise. If such assumption is verified with further experimental observations, it would mean that saturated colloidal ionic silver dispersions have to be stored on temperatures higher than 10°C because at that point the density of water starts to significantly drop thus reducing the probability of agglomeration. That puts best storage temperature in the range of 10 – 20 °C. Another solution for storage in unfavourable temperature environment would be to adjust saturation of the dispersion to account for expected storage temperature range with the consequent reduction in medicinal effectiveness.

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