Viscoelasticity of a carbon nanotube-laden air-water interface.

Autor: Chang SY; Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT, 06269, USA., Vora SR; Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT, 06269, USA., Young CD; Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT, 06269, USA., Shetty A; Rheology Division, Anton Paar USA, 10215 Timber Ridge Dr, Ashland, VA, 23005, USA., Ma AWK; Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT, 06269, USA. anson.ma@uconn.edu.; Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT, 06269, USA. anson.ma@uconn.edu.
Jazyk: angličtina
Zdroj: The European physical journal. E, Soft matter [Eur Phys J E Soft Matter] 2024 Mar 08; Vol. 47 (3), pp. 18. Date of Electronic Publication: 2024 Mar 08.
DOI: 10.1140/epje/s10189-024-00411-0
Abstrakt: The viscoelasticity of a carbon nanotube (CNT)-laden air-water interface was characterized using two different experimental methods. The first experimental method used a Langmuir-Pockels (LP) trough coupled with a pair of oscillating barriers. The second method is termed the Bicone-Trough (BT) method, where a LP trough was custom-built and fit onto a rheometer equipped with a bicone fixture to standardize the preparation and conditioning of a particle-laden interface especially at high particle coverages. The performance of both methods was evaluated by performing Fast Fourier Transform (FFT) analysis to calculate the signal-to-noise ratios (SNR). Overall, the rheometer-based BT method offered better strain control and considerably higher SNRs compared to the Oscillatory Barriers (OB) method that oscillated barriers with relatively limited positional and speed control. For a CNT surface coverage of 165 mg/m 2 and a frequency of 100 mHz, the interfacial shear modulus obtained from the OB method increased from 39 to 57 mN/m as the normal strain amplitude increased from 1 to 3%. No linear viscoelastic regime was experimentally observed for a normal strain as small as 0.5%. In the BT method, a linear regime was observed below a shear strain of 0.1%. The interfacial shear modulus decreased significantly from 96 to 2 mN/m as the shear strain amplitude increased from 0.025 to 10%.
(© 2024. The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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