Viscoelasticity of a carbon nanotube-laden air–water interface

IF 1.8 4区物理与天体物理 Q4 CHEMISTRY, PHYSICAL

The European Physical Journal E Pub Date : 2024-03-08 DOI:10.1140/epje/s10189-024-00411-0

Shing-Yun Chang, Sahil R. Vora, Charles D. Young, Abhishek Shetty, Anson W. K. Ma

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Abstract

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/m² 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%.

Graphical Abstract

Using two different experimental methods to characterize the interfacial rheology of a carbon nanotube-laden air-water interface

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含有碳纳米管的空气-水界面的粘弹性。

使用两种不同的实验方法对碳纳米管（CNT）空气-水界面的粘弹性进行了表征。第一种实验方法使用的是朗缪尔-波克尔斯（LP）槽和一对摆动屏障。第二种方法被称为双锥槽 (BT) 方法，即定制一个 LP 槽，并将其安装到配备双锥夹具的流变仪上，以标准化制备和调节含颗粒的界面，尤其是在颗粒覆盖率较高的情况下。通过快速傅立叶变换（FFT）分析计算信噪比（SNR），对两种方法的性能进行了评估。总体而言，与位置和速度控制相对有限的振荡屏障 (OB) 方法相比，基于流变仪的 BT 方法提供了更好的应变控制和更高的信噪比。对于 165 mg/m2 的 CNT 表面覆盖率和 100 mHz 的频率，随着法向应变振幅从 1% 增加到 3%，OB 方法获得的界面剪切模量从 39 mN/m 增加到 57 mN/m。在实验中，当法向应变小到 0.5%时，没有观察到线性粘弹机制。在 BT 方法中，在剪切应变为 0.1% 以下时观察到线性机制。当剪切应变振幅从 0.025 增加到 10%时，界面剪切模量从 96 mN/m 显著下降到 2 mN/m。

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来源期刊

The European Physical Journal E CHEMISTRY, PHYSICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

2.60

自引率

5.60%

发文量

审稿时长

3 months

期刊介绍： EPJ E publishes papers describing advances in the understanding of physical aspects of Soft, Liquid and Living Systems. Soft matter is a generic term for a large group of condensed, often heterogeneous systems -- often also called complex fluids -- that display a large response to weak external perturbations and that possess properties governed by slow internal dynamics. Flowing matter refers to all systems that can actually flow, from simple to multiphase liquids, from foams to granular matter. Living matter concerns the new physics that emerges from novel insights into the properties and behaviours of living systems. Furthermore, it aims at developing new concepts and quantitative approaches for the study of biological phenomena. Approaches from soft matter physics and statistical physics play a key role in this research. The journal includes reports of experimental, computational and theoretical studies and appeals to the broad interdisciplinary communities including physics, chemistry, biology, mathematics and materials science.