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High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus
Published on: April 3, 2018
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Thermophoretically induced large-scale deformations around microscopic heat centers
Mate Puljiz1, Michael Orlishausen2, Werner Köhler2
1Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany.
The Journal of Chemical Physics
|May 16, 2016
Summary
Heating microscopic particles in soft materials causes large displacements due to elasticity. This phenomenon is crucial for applications like cancer hyperthermia treatment, where surrounding tissues are affected by heated colloidal particles.
Area of Science:
- Soft matter physics
- Biophysics
- Materials science
Background:
- Selective heating of microscopic colloidal particles in soft elastic matrices is relevant to hyperthermia cancer treatment.
- The destruction of cell tissue surrounding heated magnetic colloidal particles highlights practical implications.
- Experiments indicate long-ranged, non-decaying radial displacement fields around microscopic heat sources in elastic matrices.
Purpose of the Study:
- To theoretically confirm the conjecture of long-ranged displacement fields.
- To investigate the role of material elasticity in thermophoretic displacement.
- To explain experimentally observed radial displacement patterns.
Main Methods:
- Macroscopic hydrodynamic two-fluid description incorporating thermophoretic and elastic effects.
- Theoretical analysis of displacement fields.
- Experimental validation using soft elastic polymeric matrices.
Main Results:
- Theoretical confirmation of long-ranged radial displacement fields.
- Demonstration that matrix elasticity drives large-scale radial displacements.
- Identification of finite sample size as the cause for linearly decaying displacement fields in experiments.
Conclusions:
- Material elasticity significantly influences thermophoretic displacement fields in soft matrices.
- The theoretical model accurately predicts observed phenomena, including the effect of boundary conditions.
- Understanding these displacement fields is key for optimizing applications like targeted hyperthermia.
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