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Buckling-Induced Reversible Symmetry Breaking and Amplification of Chirality Using Supported Cellular Structures

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Buckling-induced
reversible symmetry breaking and amplification of chirality using
macro- and microscale supported cellular structures
is described.
Guided by extensive theoretical analysis, cellular structures are
rationally designed, in which buckling induces a reversible switching
between achiral and chiral configurations. Additionally, it is
demonstrated that the proposed mechanism can be generalized over a wide
range of length scales, geometries, materials, and stimuli.

http://onlinelibrary.wiley.com/doi/10.1002/adma.201300617/abstract

Comments

Ahmad Rafsanjani's picture

Hi Sung

Thank you for sharing this interesting article.

I am wondering if the swelling experiment is conducted under mechanical restrains, since the mode shapes look like buckling modes of honeycomb under mechanical compression. If so, what about free swelling? Do you observe buckling there as well?

Best

Ahmad

Dear Ahmad,

Thank you for your interest and comment.

As you mentioned, we used a constrained swelling to induce buckling. 

As a constraint, we used a substrate so that we can also have a higher mode buckling to have a chiral pattern. Here, the honeycomb structure is attached to a substrate so that when the entire structure swells, the substrate works as a constraint, which results in applying a compressive loading to the honeycomb structure.

As a result, the structure can buckle in a desired mode which can be controlled by changing a dimensionless parameter (aspect ratio, the length/height of the wall of the honeycomb).

If there is no substrate, only the first mode (half wavelength of the buckling over a wall of the honeycomb) buckling appears with a constrained swelling. 

If there is no constraint at all (no additional part for a constrained swelling or the honeycomb is not attached to the substrate), I imagine the structure just expands.

Alternatively, we can also use a mechanical loading by applying a compressive stress on the structure to induce buckling.

If you have any other comment or question, please let me know.

Thank you.

 

Best,

Sung Hoon 

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