Particle Size of Titanium Dioxide
Particle size refers to the size of a particle, for regular spherical particles, we can use the "diameter" to accurately describe its size, in actual production, due to the instability of the control, the vast majority of cases the shape of the particles are not spherical, can not be expressed in terms of diameter, so that the size of the particles introduced the The concept of "particle size" was introduced.
The so-called particle size can be understood as a factor of size. The same particle, due to the different applications, often measurement methods will be different, the value of the particle size obtained is also different; microscope to see the size of the particle and the projection on the perpendicular plane of the line of sight; sieving method to obtain the particle size is the size of the sieve hole; sedimentation determination method to obtain a certain settling characteristics of the same spherical particle diameter. In production practice, the involved is often not a single particle size, but contains a number of particles of different particle sizes of the aggregate, that is, the particle group, how to describe the particle group of all particle size characteristics has also become a problem. Nowadays, the average particle size of the particle group is calculated by statistical mathematical methods, and then segmented to describe the size and distribution of particles, i.e. particle size distribution, i.e. the particle content of different particle size intervals in pigment powders.
The titanium dioxide we see, whether anatase or rutile, is composed of single crystals of spherical particles with a diameter of 0.1 to 0.3 μm. The size of the single crystal particles and the resulting agglomeration of the secondary particle binding force values and the amount of binding will lead to a large change in the pigment properties of the titanium dioxide dispersion system, such as whiteness, achromatic power, dispersion, and weatherability. Therefore, particle size and particle size distribution is one of the important properties affecting pigment performance and application index, and has a decisive influence on almost all pigment properties.
