Posted in | News | Nanomaterials | Nanoanalysis

Analytik Discuss Nanoparticle Characterisation Work of University fo Sheffield Researchers

Analytik, leading suppliers of innovative analytical instrumentation, talk about the particle characterisation work performed by Professor Steve Armes and his team in the Department of Chemistry at the University of Sheffield.

Among the research interests of Professor Steve Armes is the synthesis and characterisation of colloidal systems. His group has used disc centrifuge photo-sedimentometry to size a wide range of latexes, sols and colloidal nanocomposite particles over the last fifteen years. One of the tools used is the high resolution 24,000 rpm disc centrifuge from CPS. This has delivered reliable results with a wide range of latexes and nanocomposite particles. This new instrument has a maximum centrifugation rate of 24,000 rpm, which is substantially faster than the older Brookhaven disc centrifuge (15,000 rpm). This means that much smaller particles can now be sized with good accuracy and reproducibility.

Professor Steve Armes from the University of Sheffield with his CPS Disc Centrifuge system.

The CPS disc centrifuge has proved to be particularly useful for sizing a family of new poly(2-hydropropyl methacrylate) latexes prepared by aqueous dispersion polymerisation (see A. M. Ali et al., Soft Matter, 2007, 2, 1003-1013). Since poly(2-hydroxypropyl methacrylate) is soluble in alcohol, these particular latexes become swollen in methanol/water mixtures, which is the normal spin fluid used for the Brookhaven instrument. This means that the solid-state particle density determined by helium pycnometry is no longer applicable, which invalidates the particle size measurement. In contrast, the wholly aqueous spin fluid used in the CPS disc centrifuge prevents latex swelling and allows meaningful particle size analyses to be performed. Other advantages offered by the CPS disc centrifuge include its Windows software and straightforward mode of operation which is well suited to sizing the many different samples encountered within a typical laboratory day. This is additionally useful to the Armes research group as they also offer a particle size analysis service to industrial companies.

Discussing his use of the CPS, Professor Armes said, "We have shown that the CPS disc centrifuge offers a very convenient means of verifying whether silica redistribution occurs when polymer-silica nanocomposite particles are challenged with excess latex. Such redistribution is accompanied by incipient flocculation, which is readily detected if the challenging latex is chosen to have a different size to the original nanocomposite particles. Although we have also characterised silica redistribution using small-angle x-ray scattering, electron microscopy and x-ray photoelectron spectroscopy, we find that the CPS disc centrifuge is the easiest and most convenient technique for simply establishing whether this phenomenon has occurred or not. The CPS instrument has proved to be an indispensable characterisation tool in our research programme and it should provide us with robust, reliable particle sizing capability for many years to come."


Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Analytik Ltd. (2019, February 12). Analytik Discuss Nanoparticle Characterisation Work of University fo Sheffield Researchers. AZoNano. Retrieved on April 19, 2024 from

  • MLA

    Analytik Ltd. "Analytik Discuss Nanoparticle Characterisation Work of University fo Sheffield Researchers". AZoNano. 19 April 2024. <>.

  • Chicago

    Analytik Ltd. "Analytik Discuss Nanoparticle Characterisation Work of University fo Sheffield Researchers". AZoNano. (accessed April 19, 2024).

  • Harvard

    Analytik Ltd. 2019. Analytik Discuss Nanoparticle Characterisation Work of University fo Sheffield Researchers. AZoNano, viewed 19 April 2024,

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.