Positions of the measured particle sizes on the accompanying graph are in excellent agreement with the known sizes of 92 and 269 nm.ĭuring a measurement, the display can be switched interactively between any one of these - correlation function, lognormal, or multimodal - each shown “live” as data are accumulated. These results are for a mixture of known latex particles. Here, a numerical algorithm, including Mie theory, is used. The second choice is to fit these values to a lognormal distribution, allowing the user to visualize the size distribution and to interpolate cumulative and differential results at 5% intervals.įigure 2: Results from Test Bimodal Sample on NanoBrook Omni (diameters, in nm)įigure 2 above shows an example of the third choice, suitable for more complicated, multimodal size distributions. This is illustrated above in Figure1 for the latex with a narrow size distribution. Dia.) and a measure of the distribution width (Polydispersity) are sufficient for many applications. For routine determinations an average diameter (Eff. The NanoBrook particle size and zeta potential analyzer offers three choices. In all case, just a few minutes are required for the sample and cell to equilibrate with the actively controlled temperature environment inside the NanoBrook. In addition, disposable, glass round cells with reusable Teflon stoppers are used for aggressive solvent suspensions. At 90° square polystyrene or glass cells (two or three mL) are used, one as small as 10 µL (non-disposable). At 173° sample volume may be reduced to 50 µL with a polystyrene, U-shaped, disposable cuvette and the sample is recoverable. A small ultrasonicator is sometimes useful in breaking up loosely-held agglomerates. Dilute suspensions, on the order of 0.0001 to 1.0% v/v are prepared, using suitable wetting and/or dispersing agents, if required.
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