NOTE: There is a minimum billable increment of one hour. Staff will provide training only the instrument charge will apply for training. This instrument is intended for use by students and other researchers. The instrument is located in 1240 Hach Hall. A range of disposable and reusable cells are available to optimize the measurement in terms of sample volume, concentration and flow measurement. The MPT-2 Autotitrator allows the study of the effect of changes in pH, conductivity, or any additive to be automated. The flow mode option enables the system to be connected to an SEC or an FFF system to use as a detector for the size of proteins or nanoparticles. Zeta-potential may be measured in the range of 3.8nm to 100um. Size may be measured in the range of 0.3nm to 10um. Samples may be measured at very low or high concentration using dynamic light scattering with ‘NIBS’ optics. Furthermore, the discussion of reasons of stability of bubbles was carried out.The Zetasizer Nano ZS is a high performance two angle particle, zeta-potential, and molecular size analyzer for the enhanced detection of aggregates and small particles. Additionally, the average zeta potential of nanobubbles in stable dispersions was between - 10 m V and - 15 m V in pure water without any frother additions. Obtained nanobubbles were stable for over a month and their Sauter diameter approached the value in the range 250–350 nm from different initial sizes. The result shows that stability and size of nanobubbles did not depend on whether samples were left open or closed. Additionally, in the case of oxygen the dissolved gas concentration was measured. During storage Sauter diameter and zeta potential of nanobubbles were measured. Half of them were stored open and other half closed to ensure or deny contact with the atmosphere, respectively. Samples of nanodispersions were stored for 10 to 35 days.
Gas phase was nitrogen or oxygen, and the liquid phase was distilled water. The generation of nanobubbles was carried out in two porous-membrane modules for two distinct values of liquid flow rate. The focus of this work was to examine the stability of gas nanobubbles in water.
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