10.1021/acs.nanolett.8b00828.s003
Ziao Tian
Ziao
Tian
Wen Huang
Wen
Huang
Borui Xu
Borui
Xu
Xiuling Li
Xiuling
Li
YongFeng Mei
YongFeng
Mei
Anisotropic Rolling and Controlled Chirality of Nanocrystalline
Diamond Nanomembranes toward Biomimetic Helical Frameworks
American Chemical Society
2018
material
helical microscale actuation
FEM
3 D design
VO 2
Cr
technology
application
diamond-based helical framework
Nanocrystalline Diamond Nanomembranes
Biomimetic Helical Frameworks Future advances
model
2018-05-25 14:04:04
Media
https://acs.figshare.com/articles/media/Anisotropic_Rolling_and_Controlled_Chirality_of_Nanocrystalline_Diamond_Nanomembranes_toward_Biomimetic_Helical_Frameworks/6356387
Future advances in materials will
be aided by improved dimensional
control in fabrication of 3D hierarchical structures. Self-rolling
technology provides additional degrees of freedom in 3D design by
enabling an arbitrary rolling direction with controllable curvature.
Here, we demonstrate that deterministic helical structures with variable
rolling directions can be formed through releasing a strained nanomembrane
patterned in a “utility knife” shape. The asymmetry
of the membrane shape provides anisotropic driving force generated
by the disparity between the etching rates along different sides in
this asymmetric shape. A transient finite element method (FEM) model
of diagonal rolling is established to analyze the relationships among
geometries, elastic properties, and boundary conditions. On the basis
of this model, a diamond-based helical framework consisting of two
or three helical segments has been fabricated to mimic the shapes
of natural plants. Further experiment has been done to extend this
approach to other materials and material combinations, such as MoSe<sub>2</sub>/Cr, Cr/Pt, and VO<sub>2</sub>. To demonstrate the possible
application accessible by our technology to new fields, VO<sub>2</sub>-based helical microscale actuation has been demonstrated with photocontrollable
bending in a selected region, as well as morphable and recognizable
helix. This study offers a new way to construct helical mesostructures
that combine special properties of the advanced materials, thus possess
novel features and potential applications.