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Controlling the drying-induced peeling of colloidal films
Abdulkadir Osman1, Lucas Goehring2, Hugh Stitt3
1Department of Chemical Engineering and Analytical Science, The University of Manchester, Manchester, M13 9PL, UK.
Soft Matter
|September 23, 2020
Summary
Adding polyethylene oxide (PEO) to colloidal silica suspensions reduces film peeling instability during drying. Increased PEO concentration and molecular weight modify suspension properties, optimizing drying dynamics for industrial applications like inkjet printing.
Area of Science:
- Materials Science
- Fluid Dynamics
- Colloid Science
Background:
- Film peeling instability is a common issue in drying processes.
- Understanding the factors influencing drying dynamics is crucial for industrial applications.
Purpose of the Study:
- To investigate how suspension properties affect drying dynamics.
- To determine the impact of polyethylene oxide (PEO) additives on film peeling instability.
Main Methods:
- Experiments using aqueous mixtures of colloidal silica dispersions and PEO additives.
- Time-lapse digital microscopy to observe evaporating droplets.
- Analysis of drying front length and film formation.
Main Results:
- Increased PEO concentration and molecular weight significantly reduce film peeling.
- PEO additives alter suspension properties, modifying the drying front length.
- Elimination of film peeling is achievable with optimized PEO content.
Conclusions:
- Suspension properties play a critical role in controlling drying dynamics and preventing film failure.
- PEO is an effective additive for mitigating film peeling instability in colloidal dispersions.
- Findings are relevant for optimizing inkjet printing, coating, and other industrial processes.
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