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EC number: 236-675-5
CAS number: 13463-67-7
The point at which the curve crosses a zeta
potential value of 0 mV is known as the isoelectric point, where the
particles effectively carry no net electrical charge.
Conductivity measurements obtained for each
sample remained fairly consistent from pH 4 to pH 11, which is an
important property for zeta potential measurement. Below pH 4,
conductivity was found to increase markedly, likely due to the
substantial amounts of HCl needed in order to reach the low pH values.
As a result, the concentration of TiO2 also decreased substantially in
this pH range. In addition, the composition of each of the samples is
not known. It is often found that TiO2 is coated with e.g. Al2O3 or ZrO2
which, especially in the case of Al2O3 exhibit increased solubility at
pH values > pH 10. It is therefore strongly noted that data points below
pH 4 and above pH 10 are unreliable in comparison to the rest of the
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