Study on the electrical resistivity of nano calcium carbonate for silicone sealant
Nano calcium carbonate(NCC)was synthesized by the carbonification method,and the effects of raw material origin,crystal shape control agent,type and content of surface treatment agent,process water quality on the electrical resistivity of NCC were investigated.The research results showed that the type and content of surface treatment agent had the most significant impact on the electrical resistivity of NCC,followed by raw material origin,and the influence of crystal shape control agent and process water quality was relatively small.This was because the type and concentration of ions adsorbed or entrapped in nano calcium particles were the main factors affecting the resistivity of nano calcium.The mechanism of influence was that,under the action of the electric field,Na+ and OH-introduced by the process migrated and transported through the capillary tube formed between the NCC particles,causing ion tunneling through the material matrix.The high concentration and molar conductivity intensified the resistivity attenuation of nano calcium.The concentrations of Mg2+,Fe2+,Ca2+,and CO32-introduced by the raw material were low,they were difficult to undergo ion tunneling migration,could only be dissolved in traces of free water to form a sparse distribution of the"salt pool",which relied on interconnection to migrate and conduct electricity,and thus had less impact on electrical resistivity.
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