Effect of particle shape on drying dynamics in suspension drops using multi-speckle diffusing wave spectroscopy

Baek Sung Park, Kevin Injoe Jung, Seong Jae Lee, Kwan Young Lee, Hyun Wook Jung

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


The relationship between particle dynamics in a suspension drop during drying and final coffee ring patterns was investigated using suspension systems with spherical and non-spherical ellipsoidal particles. Employing multi-speckle diffusing wave spectroscopy (MSDWS), fast particle Brownian motions in suspension drops containing spherical and ellipsoidal particles were quantitatively compared during the drying process in real time. From the autocorrelation function data and characteristic times for β-relaxation, we confirmed that ellipsoidal particles move more slowly than spherical particles in a suspension drop due to their structural factor. The resulting coffee ring patterns by spherical and ellipsoidal particles are clearly distinguishable from one another and are dependent upon particulate concentration, initial drop volume, and particle shape. Notably, ellipsoidal particles in a suspension drop form coffee rings less readily than spherical particles.

Original languageEnglish
Pages (from-to)971-979
Number of pages9
JournalColloid and Polymer Science
Issue number5
Publication statusPublished - 2018 May 1


  • Autocorrelation function
  • Characteristic time
  • Coffee ring effect
  • Multi-speckle diffusing wave spectroscopy
  • Spherical and ellipsoidal particles
  • Suspension drying
  • β-relaxation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry


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