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Zeta potential is measured using a combination of measurement techniques: Electrophoresis and Laser Doppler Velocimetry.
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The data can be presented as intensity, volume or number distribution vs. The instrument determines the size by measuring the Brownian motion of the particles in a sample using Dynamic Light Scattering (DLS) and then interpreting a size from this using established theories. The particle size measured by the instrument is the diameter of the sphere that diffuses at the same speed as the particle being measured. The instrument is equipped with the 633nm laser and utilizes 173° detection optics for back-scatter detection. Molecular weight (1000 to 2x10 7 Daltons) Zeta potential (for particle size ranging from 5nm to 10μm) The Zetasizer Nano ZS provides the ability to measure three characteristics of particles or molecules in a liquid medium: Product information on the 720-ES can be found at the Agilent website.
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If you would like to use the ICP-OES in your research or would like to know more about the capabilities of the instrument feel free to contact Majid Nada at majidhameednada-nada (at). Commercial standards are available for most elements. These standards should create a standard curve containing the suspected concentration for your sample. A minimum of three standard solutions for calibration, for all elements of interest, must to be used. Approximatly 2 mL of the sample is required for a good run, smaller samples can be diluted to this volume if necessary. Our group dissolves zeolites in an HF/HCl mixture, and other groups have had success with utilizing various other acids to digest their samples. Acids are frequently used in our research for digestion of insoluble samples.
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Colloidal or other visible particles will cause problems in the sample induction system. Other groups have used the instrument to measure iron oxide nanoparticle impurities, denture impurities, solid catalyst composition and for inorganic crystal product elemental analysis.Īll samples for the ICP need to be completely dissolved in aqueous solution. The Larsen lab uses the ICP for measurements of zeolite composition as well as transition metal absorption onto zeolites and mesoporous silica. Bulk composition information or trace impurities can be measured in a sample due to the large available linear range. Sub ppm detection of transition metals is commonly achieved in our research. With the use of the SPS3 autosampler users can run a large number of samples with minimal user intervention and setup. This instrument is primarily used for quantitative elemental analysis both by our group and outside users in the chemistry and other departments on campus.