1, pyridine is added to reduce the solubility of sorbic acid in water. To put it bluntly, it is easier to crystallize and form a solid, that is, to separate. Whether there is a catalytic effect is unknown.
2. Since sorbic acid is an acid, it definitely needs PH quality. If it becomes alkaline, it will definitely form salt. The purpose of freezing overnight is to reduce the temperature and solubility, just like adding pyridine.
I really don't know.
4. Full-range Mie scattering theory winner series laser particle size analysis adopts full-range Mie scattering theory, fully considers the refractive index of the dispersion medium and the measured particles, and combines with the patented measuring device to invert the particle size and particle size distribution law according to the change of scattered light intensity of particles of different sizes at various angles;
Winner series laser particle size analyzer adopts the original unconstrained fitting inversion method and spectral amplification technology, and can obtain more realistic distribution after data processing, which has important practical value for scientific research customers such as universities and research institutes.
Winner nano-laser particle size analyzer adopts CR- 128 digital correlator independently developed by the company. As we all know, domestic laser particle size analyzer enterprises all adopt the "static light scattering theory", and the effective lower limit of this theory can only reach 50 nanometers, but there is nothing they can do for smaller particles.
The measurement of nanoparticles must adopt "dynamic light scattering" technology, and the correlator, an important component to realize this technology, has been monopolized by foreign countries. Winner nano-laser particle sizer broke the international monopoly of this technology for the first time, and filled the technical gap for China. It can measure particles with a particle size of 1-3500nm.