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2013 ; 6
(4
): 1377-1390
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Cellulose Perversions
#MMPMID28809215
Canejo JP
; Godinho MH
Materials (Basel)
2013[Mar]; 6
(4
): 1377-1390
PMID28809215
show ga
Cellulose micro/nano-fibers can be produced by electrospinning from liquid
crystalline solutions. Scanning electron microscopy (SEM), as well as atomic
force microscopy (AFM) and polarizing optical microscopy (POM) measurements
showed that cellulose-based electrospun fibers can curl and twist, due to the
presence of an off-core line defect disclination, which was present when the
fibers were prepared. This permits the mimicking of the shapes found in many
systems in the living world, e.g., the tendrils of climbing plants, three to four
orders of magnitude larger. In this work, we address the mechanism that is behind
the spirals' and helices' appearance by recording the trajectories of the fibers
toward diverse electrospinning targets. The intrinsic curvature of the system
occurs via asymmetric contraction of an internal disclination line, which
generates different shrinkages of the material along the fiber. The completely
different instabilities observed for isotropic and anisotropic electrospun
solutions at the exit of the needle seem to corroborate the hypothesis that the
intrinsic curvature of the material is acquired during liquid crystalline sample
processing inside the needle. The existence of perversions, which joins left and
right helices, is also investigated by using suspended, as well as flat, targets.
Possible routes of application inspired from the living world are addressed.
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