UMass Amherst scientists use paper-folding ideas to create reprogrammable materials
A challenge increasingly important to physicists and materials scientists in recent years has been how to design controllable new materials that exhibit desired physical properties rather than relying on those properties to emerge naturally, says University of Massachusetts Amherst physicist Christian Santangelo.
Now he and physicist Arthur Evans and polymer scientist Ryan Hayward at UMass Amherst, with others at Cornell and Western New England University, are using origami-based folding methods for “tuning” the fundamental physical properties of any type of thin sheet, which may eventually lead to development of molecular-scale machines that could snap into place and perform mechanical tasks. Results are reported today in an early online edition of Science.
At a physics meeting a couple of years ago, Santangelo mentioned the unusual properties of a special type of origami fold called Miura-ori to fellow physicist Jesse Silverberg of Cornell, a long-time origami enthusiast. Miura-ori, named after the astrophysicist who invented the technique, is a series of folded parallelograms that change the stiffness of a sheet of paper based only on the crease pattern.
Also known as tessellation, this special folding, which occurs naturally in some leaves and tissues, arranges a flat surface using a repeated pattern of alternating mountain-and-valley zigzag folds. Objects folded this way contract when squeezed, a bit like an accordion, so they can be packed into a very small shape but unfolded with little effort from the corners. This technique has been used in space to launch satellites with solar arrays that can be unfolded using only a few small motors at the edges.
Santangelo explains, “As you compress most materials along one axis, they expand in other directions. In other words, squeezing a hunk of material causes it to leak out the sides. A rare class of materials, however, does the opposite. If you compress them along one direction, they collapse uniformly in all directions. Miura-ori shows us how to use this property to make new devices. Exotic materials can be formed from traditional materials simply by altering microscopic structure.”
Santangelo, with Silverberg and Itai Cohen at Cornell and Tom Hull at Western New England, describe in their new paper how to alter patterns and introduce defects to tune a thin sheet’s stiffness and create a material in which physical properties can be programmed and reprogrammed.
Silverberg says, “The work brings together origami, metamaterials, programmable matter crystallography and more. It’s totally bizarre and unique to have so many of these ideas intersecting at the same time.”
Santangelo says active materials can change their shape, size, and/or physical properties with changes in temperature, pressure, electro-magnetic fields, or other aspects of their environment. With such materials, researchers may be able to create entire structures and systems out of single pieces that are flexible, elastic and resilient.
Santangelo adds, “In particular, this gives us the ability to make a reprogrammable material. By toggling elements of the origami structure between two stable states, we can make the structure stiffer, selectively weaken certain parts, and so on. And we can do it reversibly. Given origami’s scale-free geometric character, this framework for metamaterial design can be directly transferred to milli-, micro- and nanometer size systems.”
He adds that metamaterials are rapidly emerging at the frontier of scientific and technological innovation due to their exotic and tunable material properties, which arise from arrangements of smaller units within the bulk system to generate exotic, non-natural properties on larger scales. Miura-ori can be considered a mechanical metamaterial because its stiffness can be controlled by the specific fold angles of the parallelograms, Silverberg explains.
The physicists point out that it is rare to find metamaterials that can be reconfigured beyond their original design, but origami-inspired mechanical metamaterials offer enhanced flexibility because their properties are linked to alterable folding pattern. So-called “pop-through defects” made by changing crease directions, can be introduced to change a sheet’s stiffness, so multiple stable configurations can come from a single structure yielding programmable metamaterials.
Using numerical simulations, Evans and Santangelo calculated the effect that a pop-through defect has on Miura-ori. They showed that it instantly makes the entire sheet stiffer, and the effect is additive. The Cornell group will present this research at the Sixth International Meeting on Origami in Science, Mathematics and Education on Aug. 10-13 in Tokyo.
Chris Santangelo | newswise
Meter-sized single-crystal graphene growth becomes possible
22.08.2017 | Science China Press
Nagoya physicists resolve long-standing mystery of structure-less transition
21.08.2017 | Nagoya University
Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.
As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...
Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.
Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...
For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.
While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...
An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.
The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...
A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
16.08.2017 | Event News
04.08.2017 | Event News
26.07.2017 | Event News
22.08.2017 | Health and Medicine
22.08.2017 | Materials Sciences
22.08.2017 | Life Sciences