Theoretical modeling of the Casimir force-induced instability in freestanding nanowires with circular cross-section |
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Institution: | 1. Department of Aerospace Engineering, Semnan University, Semnan, Iran;2. Physics Department, Qom Branch, Islamic Azad University, Qom, Iran;3. 16 South Maple Street, Hartford, MI 49057-1225, USA;4. Islamic Azad University, Shahrekord Branch, Shahrekord, Iran;1. Department of Physics, Devanga Arts College, Aruppukottai 626101, Virudhunagar, India;2. Department of Physics, Government Arts College, Melur 625106, Madurai, India;3. Department of Chemical Engineering, College of Engineering, Kyung Hee University, 1732 Deogyeong-daero, Gihung, Yongin, Gyeonggi 446-701, South Korea;1. School of Physics and Electrical Engineering, Weinan Normal University, Shanxi, Weinan 714000, PR China;2. School of Physics and Materials Engineering, Dalian Nationalities University, Liaoning, Dalian 116600, PR China |
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Abstract: | The Casimir force can induce instability and adhesion in freestanding nanostructures. Previous research efforts in this area have exclusively focused on modeling the instability in structures with planar or rectangular cross-section, while, to the best knowledge of the authors, no attention has been paid to investigate this phenomenon for nanowires with circular cross-section. In this study, effects of the Casimir force on the instability and adhesion of freestanding Cylinder–Plate and Cylinder–Cylinder geometries are investigated, which are commonly encountered in real nanodevices. To compute the Casimir force, two approaches, i.e. the proximity force approximation (PFA) for small separations and Dirichlet asymptotic approximation (scattering theory) for large separations, are considered. A continuum mechanics theory is employed, in conjunction with the Euler-beam model, to obtain constitutive equations of the systems. The governing nonlinear constitutive equations of the nanostructures are solved using two different approaches, i.e. the analytical modified Adomian decomposition (MAD) and the numerical finite difference method (FDM). The detachment length and minimum gap, both of which prevent the Casimir force-induced adhesion, are computed for both configurations. |
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Keywords: | Freestanding cylindrical nanowire Casimir force Instability/adhesion Proximity force approximation Scattering theory Modified Adomian decomposition method |
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