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Abstract
Ultrasonic liquid penetration (ULP) measurements of porous sheets have been applied for a variety of purposes ranging from determining liquid absorption dynamics to surface characterization of substrates. Interpretation of ULP results, however, is complex as the ultrasound signal can be affected by several mechanisms: (1) air being replaced by the liquid in the substrate pores, (2) air bubbles forming during penetration, and (3) structural changes of the substrate due to swelling of the substrate material. Analyzing tailored liquids and substrates in combination with contact angle measurements we are demonstrating that the characteristic shape of the ULP measurement curves can be interpreted in terms of the regime of liquid uptake. A fast and direct decline of the curve corresponds to capillary penetration, the slope of the curve indicates the penetration speed. A slow decline after a previous maximum in the signal can be related to diffusive liquid transport and swelling of the substrate material
Original language | English |
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Article number | 2754 |
Pages (from-to) | 1-18 |
Number of pages | 18 |
Journal | Materials |
Volume | 13 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2 Jun 2020 |
Keywords
- Capillary penetration
- Liquid penetration
- Porous sheets
- Ultrasound transmission
ASJC Scopus subject areas
- Materials Science(all)
Fields of Expertise
- Advanced Materials Science
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Dive into the research topics of 'Ultrasonic Liquid Penetration Measurement in Thin Sheets—Physical Mechanisms and Interpretation'. Together they form a unique fingerprint.Projects
- 1 Finished
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CD-Laboratory for Fiber Swelling and Paper Performance
Hirn, U., Lahti, J. A., Schennach, E., Fischer, W. J., Czibula, C. M., Urstöger, G. J., Ganser, C., Schuller, M., Krainer, S., Xhori, R., Spirk, S. & Niegelhell, K.
1/12/15 → 30/11/23
Project: Research project