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Effect of particle properties of powders on the generation and transmission of raman scattering

Townshend, Nichola and Nordon, Alison and Littlejohn, David and Andrews, John and Dallin, Paul (2012) Effect of particle properties of powders on the generation and transmission of raman scattering. Analytical Chemistry, 84 (11). pp. 4665-4670. ISSN 0003-2700

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      Transmission Raman measurements of a 1 mm thick sulfur-containing disk were made at different positions as it was moved through 4 mm of aspirin (150-212 mu m) or microcrystalline cellulose (Avicel) of different size ranges (<38, 53-106, and 150-212 mu m). The transmission Raman intensity of the sulfur interlayer at 218 cm(-1) was lower when the disk was placed at the top or bottom of the powder bed, compared to positions within the bed and the difference between the sulfur intensity at the outer and inner positions increased with Avicel particle size. Also, the positional intensity difference was smaller for needle-shaped aspirin than for granular Avicel of the same size. The attenuation coefficients for the propagation of the exciting laser and transmitted Raman photons through the individual powders were the same but decreased as the particle size of Avicel increased; also, the attenuation coefficients for propagation through 150-212 mu m aspirin were almost half of those through similar sized Avicel particles. The study has demonstrated that particulate size and type affect transmitted Raman intensities and, consequently, such factors need to be considered in the analysis of powders, especially if particle properties vary between the samples.

      Item type: Article
      ID code: 40538
      Keywords: Raman measurements, microcrystalline cellulose, transmission raman spectroscopy, particulate size, Chemistry, Analytical Chemistry
      Subjects: Science > Chemistry
      Department: Faculty of Science > Pure and Applied Chemistry
      Technology and Innovation Centre > Continuous Manufacturing and Crystallisation (CMAC)
      Related URLs:
        Depositing user: Pure Administrator
        Date Deposited: 25 Jul 2012 10:03
        Last modified: 02 Jan 2015 23:00

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