Evaporation and surface tension effects in dip coating
- Sandia National Labs., Albuquerque, NM (United States)
Evaporation sets an important time scale for the formation of structure in sol-gel films during dip coating, and surface tension is the dominant driving force influencing that structure. The action and interplay of these two phenomena were evaluated by experiments with pure and binary solvents. From the optically measured thickness of the steady-state film profile, accelerated evaporation near the drying line that sets stringent constraints on the time available for network formation was found. In binary solvents, there is evidence for strong flows driven by surface tension gradients; this flow gives rise to capillary instabilities. Aided by these flows, differential evaporation leads to regions rich in the nonvolatile component near the drying line. 29 refs., 12 figs.
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 86472
- Report Number(s):
- CONF-900802--
- Country of Publication:
- United States
- Language:
- English
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