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The Preparation of Small Particles with a SDR Traditionally, precipitations are carried out using either batch or nozzle technology.[26] More recently the HiGee reactor (cf. Figure 4) and also SDR[27,28] have also been employed. The synthesis of BaSO4 via precipitation (Reaction 5) is complete in a timescale of milliseconds and we thus took it as an example to study the suitability of a SDR as a precipitation reactor. (5) Barium sulphate is also interesting since it is often used as a filler for plastics and rubber where especially its high density is required. Commercially available BaSO4 has a particle size from 2 to 40 μm. Cai[13] was able to reproduce the results reported in GB 2377661[28] and, without too much optimisation, was able to obtain particle sizes down to 170 nm. The equipment used was essentially the same as that used for the synthesis of reactive polyurethanes and for the polymerisations already discussed. The key parameters were the concentration of the solutions and the position of the feed for the precipitant with respect to the centre of the disc. The speed of rotation and the feed rate had little effect on particle size. Nevertheless, it appears that the form of the particles is affected by the latter parameters although this effect is not well understood. [26] The need for regularly shaped silver particles with narrow particle size distributions has increased considerably in recent years. Thus, such materials find application e.g. in conductive inks as well as in seals and adhesives for electronic components.[29,30] Silver particles can be prepared by reductive precipitation in either aqueous or organic solutions.[31,32] A relatively new method is the so-called polyol-process (reaction 6). (6) AgNO3 is reacted with a polyol at temperatures between 120 and 200 oC whereby regularly formed silver nano-particles are obtained e.g. in ethylene glycol within seconds.[33,34] Thus the SDR is a very suitable reactor for this process. The polyol used as reducing agent for Ag+ by 11PDF Image | Spinning Disk Reactor for Polymers and Nanoparticles
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Infinity Turbine Developing Spinning Disc Reactor SDR or Spinning Disc Reactors reduce processing time for liquid production of Silver Nanoparticles.
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