期刊
MATERIALS TODAY COMMUNICATIONS
卷 34, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtcomm.2022.105216
关键词
Anti-biofouling; Dielectric elastomer membrane; Wrinkling instability; Contact mechanics model; Pull -off force
A 2D contact mechanics model is developed to quantify the effect of wrinkling instability on the anti-biofouling performance of DE membranes. The anti-biofouling effect is characterized by the pull-off force between the wrinkled DE membrane and biofouling. The model investigates the influence of various parameters on the pull-off force, such as pre-stretch ratio, driving voltage, DE materials, and Young's modulus.
Existing experimental studies have shown that the dynamic morphology of dielectric elastomer (DE) membranes can effectively, and reproducibly remove biofouling, but a convincing theory to quantitatively explain antibiofouling performance is lacking. In this study, a two-dimensional (2D) contact mechanics model is developed to quantify the effect of the wrinkling instability of DE membranes for anti-biofouling. We characterize the anti-biofouling effect by the pull-off force between the wrinkled DE membrane and biofouling. An electromechanical coupling finite element model is established, and post-buckling analysis is performed to predict the wrinkling instability morphology of the DE membrane caused by the Maxwell stress. The dimensionless pull-off force expressions for single-, double-, and multi-point attachments are derived. We define a dominant dimensionless parameter, the ratio of the wrinkle amplitude to wavelength (A/lambda), revealing that it is linearly related to the dimensionless voltage after the critical drive voltage is exceeded. The influence of crucial parameters such as pre-stretch ratio, driving voltage, different DE materials, and Young's modulus on the pull-off force is systematically investigated. Results indicate that pre-stretch is necessary for resistance to biofouling and that approximately 1.5 is a preferred option. The wrinkled morphology of the DE membrane can be controlled by adjusting the drive voltage, which enables real-time regulation of the pull-off force. It is found that among the commercial DE materials investigated, VHB9473 is the preferred choice for single-point attachment, while VHB4910 is recommended for double- and multi-point attachments. The developed theoretical model opens a new path for quantitative research on the green, environmentally friendly, and sustainable anti-biofouling using intelligent materials.
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