Spatially and angularly resolved spectroscopy for in-situ estimation of concentration and particle size in colloidal suspensions

Yi-Chieh Chen, David Foo, Nicolau Dehanov, Suresh N. Thennadil

Research output: Contribution to journalArticle

4 Citations (Scopus)
18 Downloads (Pure)

Abstract

Successful implementation of process analytical technology (PAT) hinges on the ability to make continuous or frequent measurements in-line or at-line of critical product attributes such as composition and particle size, the latter being an important parameter for particulate processes such as suspensions and emulsions. A novel probe-based spatially and angularly-resolved diffuse reflectance measurement (SAR-DRM) system is proposed. This instrument, along with appropriate calibration models, is designed for online monitoring of concentration of chemical species and particle size of the particulate species in process systems involving colloidal suspensions. This measurement system was investigated using polystyrene suspensions of various particle radius and concentration to evaluate its performance in terms of the information obtained from the novel configuration which allows the measurement of a combination of incident light at different angles and collection fibres at different distances from the source fibres. Different strategies of processing and combining the SAR-DRM measurements were considered in terms of the impact on partial least squares (PLS) model performance. The results were compared with those obtained using a bench-top instrument which was used as the reference (off-line) instrument for comparison purposes. The SAR-DRM system showed similar performance to the bench top reference instrument for estimation of particle radius, and outperforms the reference instrument in estimating particle concentration. The investigation shows that the improvement in PLS regression model performance using the SAR-DRM system is related to the extra information captured by the SAR-DRM configuration. The differences in SAR-DRM spectra collected by the different collection fibres from different angular source fibres are the dominant reason for the significant improvement in the model performance. The promising results from this study suggest the potential of the SAR-DRM system as an online monitoring tool for processes involving suspensions.
Original languageEnglish
Pages (from-to)6975-6988
Number of pages14
JournalAnalytical and Bioanalytical Chemistry
Volume409
Issue number30
Early online date12 Oct 2017
DOIs
Publication statusPublished - 31 Dec 2017

Keywords

  • process spectroscopy
  • process analytical technology
  • partial least squares
  • multivariate data fusion
  • spatially resolved measurements

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  • Projects

    Equipment

    Research Output

    • 4 Citations
    • 1 Abstract
    • 1 Article

    Alternative measurement configurations for extracting bulk optical properties using an integrating sphere setup

    Thennadil, S. N. & Chen, Y., 1 Feb 2017, In : Applied Spectroscopy. 71, 2, p. 224-237 14 p.

    Research output: Contribution to journalArticle

    Open Access
    File
  • 6 Citations (Scopus)
    64 Downloads (Pure)
  • Prizes

    Converge Challenge 2014

    Yi-Chieh Chen (Recipient), 30 Sep 2014

    Prize: Prize (including medals and awards)

    Activities

    • 2 Participation in conference

    15th Scandinavian Symposium on Chemometrics

    Carla Sofia Ferreira (Speaker), Okpeafoh Agimelen (Participant), Javier Cardona (Participant), Christos Tachtatzis (Participant), Jan Sefcik (Participant), Yi-Chieh Chen (Participant)
    20 Jun 2017

    Activity: Participating in or organising an event typesParticipation in conference

    18th International Conference on Near Infrared Spectroscopy

    Yi-Chieh Chen (Speaker), Daria Stoliarskaia (Participant), Carla Sofia Ferreira (Participant), Leo Lue (Participant), Jan Sefcik (Participant)
    13 Jun 2017

    Activity: Participating in or organising an event typesParticipation in conference

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