2026-09-19T19:12:19Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1271412021-07-05T14:03:20Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Irmgard Bischofberger.
Lilin, Paul.
Massachusetts Institute of Technology. Department of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2020-09-03T17:49:03Z
2020-09-03T17:49:03Z
2020
2020
https://hdl.handle.net/1721.1/127141
1191838754
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 119-122).
The drying of drops of colloidal suspensions on a hydrophilic substrate leads to the formation of a close-packed solid particle deposit. The initial volume fraction of particles sets the shape and size of this deposit, from a ring at the edge of the drop to a solid film covering the initial wetted area. We show that this deposit remains saturated with water and we explain the propagation of the solidification front by considering the evaporative flux and mass conservation. As the deposit forms, tensile drying stresses generate regularly spaced radial cracks. The crack patterns define four different regimes which we relate to experimental measurements of the deposit shape. The radial cracks separate the deposit into a multitude of petals. Due to the negative water pressure inside the pores of the deposit, these petals bend upwards creating mesmerizing forms reminiscent of blooming flowers.
by Paul Lilin.
S.M.
S.M. Massachusetts Institute of Technology, Department of Mechanical Engineering
122 pages
eng
Massachusetts Institute of Technology
MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.
http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
Drying of colloidal suspension drops : pattern formation and mechanical deformation
Thesis
application/pdf
2020-09-03T17:49:03Z
Publication
Master
MechE
unknown
unknown
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<Abstract>The drying of drops of colloidal suspensions on a hydrophilic substrate leads to the formation of a close-packed solid particle deposit. The initial volume fraction of particles sets the shape and size of this deposit, from a ring at the edge of the drop to a solid film covering the initial wetted area. We show that this deposit remains saturated with water and we explain the propagation of the solidification front by considering the evaporative flux and mass conservation. As the deposit forms, tensile drying stresses generate regularly spaced radial cracks. The crack patterns define four different regimes which we relate to experimental measurements of the deposit shape. The radial cracks separate the deposit into a multitude of petals. Due to the negative water pressure inside the pores of the deposit, these petals bend upwards creating mesmerizing forms reminiscent of blooming flowers.</Abstract>
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