We wrote this article to dive into all three technologies in terms of benefits, draw backs and features of each technology. Laser Diffraction and Dynamic Light Scattering are two other types of technologies that could be compared to our CPA for analyzing particles. We know that this isn’t the only type of technology out there that does this. Our CPA uses photo-optical technology to determine the size and shape of particles. Our most advanced type of particle analysis equipment is our Computer Particle Analyzer or CPA. It is important that we keep up with and stay experts on those advances, even if they aren’t something that we can offer from our products. We have been manufacturing them for over 140 years and they are still one of most popular products.Īs technology changes, technicians and lab managers are looking for new ways of verifying particle size that is either more advanced or more efficient. Test sieves are one of the oldest particle tools that is out there. Types of Sinter-Bonded & Laminated Wire Mesh.Types of Fabricated Parts & Customized Filter.What Are Fabricated Parts & Customized Filters?.We also show the results of the concentration studies to demonstrate how such studies should be implemented. These photos can be used to guide implementation of the eyeball method. Here, we present photographs of the suspensions in sample cells to show what nice looking suspensions look like. One has an average size of about 1,000 nm and the other has an average size of about 36 nanometers (and is a true nanoparticle). Once an approximate concentration range is established, the concentration study becomes significantly easier and faster.īelow are results of studies on two particle systems. When encountering a new nanoparticle system for dynamic light scattering size measurement, the first technique is most common. That is, the series of concentrations should be of the form 2, 4, 8, 16 … rather than 2, 4, 6, 8 …. Note that concentration is varied exponentially rather than linearly in such a study. One then chooses the range of concentration over which the measured size does not change. The second approach is to measure the size of a series of suspensions and plot measured size as a function of particle concentration. The first is to inspect suspensions and choose a clear to just barely cloudy suspension. There are two approaches to choosing particle concentration. Therefore, when developing methods, it is important to keep particle concentration in mind. At high particle concentration, the data seems normal, but the size results are distorted. In either case, these interactions change particle motion compared to the motion assumed when calculating particle size from DLS data. Or, the interactions can be long range electrostatic interactions. These interactions can be particle-particle collisions at high particle concentrations. When the particle concentration is too high, the measurement results are distorted due to particle-particle interactions. When the particle concentration is too low, the scattering from the particles is weak and the measurement results are noisy. When nanoparticle size is determined using dynamic light scattering (DLS), one important parameter is particle concentration.
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