Electrical noise generated by the capillary flow of alkalized latex dispersions carrying carboxyl groups

It has been demonstrated that strong electrical noise is generated during capillary flow of an alkalized latex dispersion of copolymer carrying carboxylic groups where the dispersion particles are swollen. On the other hand, if the content of dissociated carboxylic groups in the alkalized dispersion is higher and swelling turns into decomposition of the particles to macromolecules or their aggregates, the thermal (Nyquist) noise at rest remains unaffected by flow, even if the flow curves are similar to corresponding ones when strong noise is generated. Viscosities and first normal stress differences measured at lower shear stresses suggest that the occurrence of noise generation during flow is affected, not only by pseudoplasticity and elasticity of the liquid, but also by its microstructure.