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Why do drying films crack?

delete2004-10-15
delete233
PRE
AI
W
Wai Peng Lee
A
Alexander F. Routh
DOI:10.1021/la049020vdelete
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摘要

摘要

En 中文
Understanding the mechanism by which films fail during drying is the first step in controlling this natural process. Previous studies have examined the spacing between cracks with predictions made by assuming a balance between elastic energy released with a surface energy consumed. We introduce a new scaling for the spacing between cracks in drying dispersions. The scaling relates to the distance that solvent can flow, to relieve capillary stresses, as a film fails. The scaling collapses data for a range of evaporation rates, film thicknesses, particle sizes, and materials. This work identifies capillary pressures, induced by packed particle fronts travelling horizontally across films, as responsible for the failure in dried films.
Keyword:
STRESSES
ARRAYS

期刊

Langmuir 封面图
Langmuir
IF:
3.9
论文数:
5.4W
被引数:
10.6W

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