Solidification of Suspended Colloids at Nonplanar Interfaces

Zhanping Xu, Hongfeng Yu, Jia Yan, Li Tan

Research output: Contribution to journalArticle

Abstract

Freeze-drying has been widely used to deliver wide varieties of porous structures because of its processing ease and environment-friendly nature. However, freezing of colloidal suspensions is also complex that depends on interplay of multiple parameters including the rate of processing, the magnitude of temperature gradient, and the portion of each component in the liquid mixture. While these parameters are relatively easy to measure and control, the mutual interaction between the growing solid-liquid interface and the solute content in the suspension is much harder to evaluate. We present a two-dimensional numerical model to simulate this latter scenario in a unidirectional freezing process, with a focus of colloidal particle motions at self-evolving nonplanar solid-liquid interface. This growing interface is determined by a real-time thermal and constitutional supercooling in the liquid medium. We found colloidal particles can be rejected by the interface if the repelling from the interface is strong and freezing speed is low. Microscale liquid medium among colloidal particle gaps can freeze when particles are highly packed between frozen solid tips, with small pores easily frozen than larger ones. Noting all these findings are revealed by coupling our simulation with a visualization module though high performance GPU devices.

Original languageEnglish (US)
Pages (from-to)17-31
Number of pages15
JournalMacromolecular Symposia
Volume365
Issue number1
DOIs
StatePublished - Jul 1 2016

Fingerprint

Colloids
freezing
solidification
Solidification
colloids
liquid-solid interfaces
Freezing
Liquids
liquids
freeze drying
particle motion
supercooling
Suspensions
microbalances
low speed
temperature gradients
solutes
modules
Supercooling
porosity

Keywords

  • colloidal suspension
  • directional solidification
  • interactive simulation
  • nonplanar interface
  • particles

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Solidification of Suspended Colloids at Nonplanar Interfaces. / Xu, Zhanping; Yu, Hongfeng; Yan, Jia; Tan, Li.

In: Macromolecular Symposia, Vol. 365, No. 1, 01.07.2016, p. 17-31.

Research output: Contribution to journalArticle

Xu, Zhanping ; Yu, Hongfeng ; Yan, Jia ; Tan, Li. / Solidification of Suspended Colloids at Nonplanar Interfaces. In: Macromolecular Symposia. 2016 ; Vol. 365, No. 1. pp. 17-31.
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