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Morphometric analysis of polygonal cracking patterns in desiccated starch slurries
Yuri Akiba1, Jun Magome1,2, Hiroshi Kobayashi1
1Department of Environmental Sciences, University of Yamanashi, 4-4-37, Takeda, Kofu, Yamanashi 400-8510, Japan.
Physical Review. E
|September 28, 2017
Summary
Polygonal cracking in dried starch films differs between potato and corn starches. Starch grain properties influence crack patterns and cell area distribution, affecting water transport and stress fields.
Area of Science:
- Materials Science
- Soft Matter Physics
- Rheology
Background:
- Polygonal crack patterns form on drying films due to capillary stress.
- Starch slurries are complex fluids with unique drying behaviors.
Purpose of the Study:
- To investigate the distinct polygonal cracking patterns in potato and corn starch slurries.
- To understand the influence of starch grain characteristics and slurry thickness on crack geometry.
Main Methods:
- Experimental drying of starch slurries with varying thicknesses.
- Microscopic observation of crack evolution on the film surface.
- Analysis of polygonal cell area distribution.
Main Results:
- Potato and corn starches exhibit different crack evolution dynamics.
- Slurry thickness significantly impacts the probability distribution of polygonal cell area.
- Starch grain morphology is identified as a key factor influencing cracking.
Conclusions:
- Differences in starch grain shape and size affect water capillary transport and stress fields.
- These factors ultimately drive the observed polygonal cracking patterns in dried starch films.
