Mechanics of a Carbon Nanocoil

Abstract

An individual carbon nanocoil was clamped between two AFM cantilevers and loaded in tension to a maximum relative elongation of ∼42%. The deformation of the nanocoil agrees well with an analytical model of the spring constant that accounts for the geometric nonlinearity. The nanocoil behaves like an elastic spring with a spring constant K of 0.12 N/m in the low strain region. No plastic deformation was detected. High-resolution microscopy images and the electron energy loss spectrum (EELS) indicate that the nanocoils are amorphous with a sp 2 /sp 3 bonded-carbon ratio of ∼4:1.

Elastic properties of nanowires

“…8,10 Bending of nanowires 8,11,27,28 and stretching of nanocoils 29 have been reported in the literature but there is no report about the twisting nanowire experiments. Nakatani and Kitagawa 30 recently presented an atomistic study of twisting a nanowire using molecular dynamics.…”

Entanglement and the Nonlinear Elastic Behavior of Forests of Coiled Carbon Nanotubes

“…Coiled carbon nanotubes (CCNTs) were first predicted to exist in the early 1990s by Dunlap [4] and Ihara et al [5][6][7] and experimentally observed in 1994 by Zhang et al [8]. CCNTs have been receiving increasing interest because of their additional capability to serve as nanoscale mechanical springs [9] and electrical inductors [10], and for their potential applications in composites [11].…”

Electronic and optical properties of deformed graphitic and helical nanobutes

“…Zbog složenosti samog postupka, u literaturi postoji svega nekoliko rezultata merenja [73] elastičnih koeficijenata ičvrstine. Na slici 4.9 preuzetoj iz reference [73], prikazan je postupak podužnog istezanja helikalne tube.…”

“…Na slici 4.9 preuzetoj iz reference [73], prikazan je postupak podužnog istezanja helikalne tube. Maksimalno istezanje, izmereno neposredno pre odvajanja tube od substrata, iznosi 42 %,što je dvostruko više nego kod običnih nanotuba.…”

“…Slika je preuzeta iz ref. [73]. Tubularni dijametar tube je 126 nm, helikalni dijametar 420 nm i korak 120 nm.…”