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Effect of dilution on particle size analysis of w/o emulsions by dynamic light scattering

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Abstract
Dynamic Light Scattering (DLS) is a well-known (sub)micron particle size analysis technique. As such, it should be a valuable technique for water droplet size determination in (sub)micron water-in-oil emulsions. In this study, the sample pretreatment conditions were optimized in order to enable accurate droplet size determination by DLS. Whereas DLS was indeed capable of detecting differences between differently produced (sub)micron sized w/o emulsions, it was observed that the estimated droplet size was highly influenced by the measurement conditions used. First of all, the experimentally determined diffusion coefficient decreased with increasing water droplet concentration, which is thought to be due to interaction effects between the water droplets. To minimize this effect, the used concentration should be as low as possible. However, in doing so, the water droplets were frequently observed to disappear during storage or even during analysis, due to their dissolution in the dilution medium. The latter disturbing effect could be avoided by (sufficient) water saturation of the dilution medium and preventing water evaporation by closing the diluted sample and by restricting the head space. Summarizing, (sub)micron water droplets can be characterized using DLS. However, careful selection of the sample preparation and measurement conditions is necessary to obtain reliable data.
Keywords
Physical and Theoretical Chemistry, Surfaces, Coatings and Films, Polymers and Plastics, DLS, w, o emulsions, droplet sizing, IN-OIL EMULSIONS, DROPLET SIZE, WATER, NMR, SOLUBILITY, MAGNESIUM, STABILITY, DENSITY, IMPACT

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MLA
Balcaen, Mathieu, et al. “Effect of Dilution on Particle Size Analysis of w/o Emulsions by Dynamic Light Scattering.” JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY, vol. 42, no. 6, 2021, pp. 869–79, doi:10.1080/01932691.2020.1712216.
APA
Balcaen, M., De Neve, L., Dewettinck, K., & Van der Meeren, P. (2021). Effect of dilution on particle size analysis of w/o emulsions by dynamic light scattering. JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY, 42(6), 869–879. https://doi.org/10.1080/01932691.2020.1712216
Chicago author-date
Balcaen, Mathieu, Lorenz De Neve, Koen Dewettinck, and Paul Van der Meeren. 2021. “Effect of Dilution on Particle Size Analysis of w/o Emulsions by Dynamic Light Scattering.” JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY 42 (6): 869–79. https://doi.org/10.1080/01932691.2020.1712216.
Chicago author-date (all authors)
Balcaen, Mathieu, Lorenz De Neve, Koen Dewettinck, and Paul Van der Meeren. 2021. “Effect of Dilution on Particle Size Analysis of w/o Emulsions by Dynamic Light Scattering.” JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY 42 (6): 869–879. doi:10.1080/01932691.2020.1712216.
Vancouver
1.
Balcaen M, De Neve L, Dewettinck K, Van der Meeren P. Effect of dilution on particle size analysis of w/o emulsions by dynamic light scattering. JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY. 2021;42(6):869–79.
IEEE
[1]
M. Balcaen, L. De Neve, K. Dewettinck, and P. Van der Meeren, “Effect of dilution on particle size analysis of w/o emulsions by dynamic light scattering,” JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY, vol. 42, no. 6, pp. 869–879, 2021.
@article{8697561,
  abstract     = {{Dynamic Light Scattering (DLS) is a well-known (sub)micron particle size analysis technique. As such, it should be a valuable technique for water droplet size determination in (sub)micron water-in-oil emulsions. In this study, the sample pretreatment conditions were optimized in order to enable accurate droplet size determination by DLS. Whereas DLS was indeed capable of detecting differences between differently produced (sub)micron sized w/o emulsions, it was observed that the estimated droplet size was highly influenced by the measurement conditions used. First of all, the experimentally determined diffusion coefficient decreased with increasing water droplet concentration, which is thought to be due to interaction effects between the water droplets. To minimize this effect, the used concentration should be as low as possible. However, in doing so, the water droplets were frequently observed to disappear during storage or even during analysis, due to their dissolution in the dilution medium. The latter disturbing effect could be avoided by (sufficient) water saturation of the dilution medium and preventing water evaporation by closing the diluted sample and by restricting the head space. Summarizing, (sub)micron water droplets can be characterized using DLS. However, careful selection of the sample preparation and measurement conditions is necessary to obtain reliable data.}},
  author       = {{Balcaen, Mathieu and De Neve, Lorenz and Dewettinck, Koen and Van der Meeren, Paul}},
  issn         = {{0193-2691}},
  journal      = {{JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY}},
  keywords     = {{Physical and Theoretical Chemistry,Surfaces,Coatings and Films,Polymers and Plastics,DLS,w,o emulsions,droplet sizing,IN-OIL EMULSIONS,DROPLET SIZE,WATER,NMR,SOLUBILITY,MAGNESIUM,STABILITY,DENSITY,IMPACT}},
  language     = {{eng}},
  number       = {{6}},
  pages        = {{869--879}},
  title        = {{Effect of dilution on particle size analysis of w/o emulsions by dynamic light scattering}},
  url          = {{http://doi.org/10.1080/01932691.2020.1712216}},
  volume       = {{42}},
  year         = {{2021}},
}

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