German company Colloid Metrix is a professional research and manufacturing instrument company that specializes in characterizing alternating features. In terms of colloid formula analysis, CMX's Stabino, Zeta check, and Nano Flex provide users with a new measurement method for flow/Zeta potential and particle size. At the same time, Stabino combined with Nano Flex also provides multiple titration functions, which can achieve the measurement of particle size and Zeta potential changes as well as isoelectric point in salt solutions and polyelectrolyte solution systems with different pH values and concentrations.

Measurement principle of 180 ° DLS

The laser is focused on the sample through optical fibers and sapphire windows. The window will reflect some incoming light. The reflected and scattered light of the laser are measured on the detector. The fluctuation of the signal is partly due to the Brownian diffusion of particles. Convert the energy spectrum using a fast Fourier transform algorithm and compare it with the frequency of the laser itself. No need to assume any distribution model, the particle size distribution is directly calculated from the energy spectrum data.

Application of 180 ° DLS

The NANO flex II with DLS method is almost unlimited, as long as the sample viscosity is within the range of Newtonian fluids, which is a prerequisite for performing free Brownian motion and accurately measuring particle size in liquids. The liquid medium in which the particulate matter is located can be water or organic solvents. The critical solidification point of a dispersion can be determined by particle size testing and potential testing. Therefore, the sensor of NANO flex II can be immersed in the testing chamber of Stabino II to achieve this goal.

divide into two parts

The biggest drawback of an instrument with two functions is that it cannot provide two different groups of people to use. NANO flex II and Stabino II can be used together or separately.

Characteristics of 180 ° DLS

The optical path can be measured (<0.3 μ m), which means there is no interference from multiple scattering; Even opaque samples can still be measured

The sample concentration can reach 40% v/v

The particle size test results will not change due to changes in concentration

In the same test, it has high dynamic range and high resolution

• Can achieve in-situ testing without dilution