Inspired by origami, North Carolina State University researchers have found a approach to remotely control a method in that a two-dimensional (2-D) piece folds itself into a three-dimensional (3-D) structure.
“A longstanding plea in a margin has been anticipating a approach to control a method in that a 2-D piece will overlay itself into a 3-D object,” says Michael Dickey, a highbrow of chemical and biomolecular engineering during NC State and co-corresponding author of a paper describing a work. “And as anyone who has finished origami – or folded their washing – can tell you, a method in that we make a folds can be intensely important.”
“The method of folding is critical in life as good as in technology,” says co-corresponding author Jan Genzer, a S. Frank and Doris Culberson Distinguished Professor of Chemical and Biomolecular Engineering during NC State. “On tiny length scales, consecutive folding around molecular machine enables DNA to container well into chromosomes and assists proteins to adopt a organic conformation. On vast length scales, consecutive folding around motors helps solar panels in satellites and space shuttles reveal in space. The allege of a stream work is to satisfy materials to overlay sequentially regulating usually light.”
Specifically, a researchers have grown a technique to settlement and fashion 2-D materials that can be tranquil remotely in method to trigger any of a given folds to take place, in any order.
Dickey and Genzer were early leaders in a margin of self-folding 3-D structures. In their landmark 2011 paper, a researchers summarized a technique in that a pre-stressed cosmetic piece was run by a required inkjet printer to imitation confidant black lines on a material. The element was afterwards cut into a preferred settlement and placed underneath an infrared light, such as a feverishness lamp.
The printed lines engrossed some-more appetite than a rest of a material, causing a cosmetic to agreement – formulating a hinge that folded a sheets into 3-D shapes. By varying a breadth of a printed lines, or hinges, a researchers were means to change how distant – and how fast – any hinge folds. The technique is concordant with blurb copy techniques, such as shade printing, roll-to-roll printing, and inkjet printing, that are inexpensive and high-throughput though inherently 2-D.
The new allege uses radically a same technique, though takes advantage of a fact that opposite colors of ink catch opposite wavelengths, or colors, of light.
“By copy a hinges in opposite colors, we can control a method of a folds by altering a wavelengths of light that shines on a 2-D sheet,” Genzer says.
For example, if one hinge is printed in yellow and another hinge is printed in blue, a researchers can make a yellow hinge overlay by exposing it to blue light. The blue hinge won’t fold, since blue ink doesn’t catch blue light. The researchers can afterwards make a blue hinge overlay by exposing a piece to red light.
In addition, by utilizing a colors of ink, a researchers were also means to get hinges to overlay sequentially when unprotected to a singular wavelength of light. This is probable since some colors will catch a given wavelength of light some-more well than others. [Note: a video of a consecutive folding techniques in movement can be seen during https://youtu.be/ZlZOdiwbZIE.]
“This is a proof-of-concept paper, though it opens a doorway to a operation of intensity applications regulating a elementary and inexpensive process,” Dickey says.
“Ultimately, people are meddlesome in self-assembling structures for mixed reasons, from shipping things in a prosaic package and carrying them arrange on site to carrying inclination self-assemble in ‘clean’ environments for medical or electronic applications.”
The paper, “Sequential Self-folding of Polymer Sheets,” is published in a AAAS biography Science Advances. Lead author of a paper is Ying Liu, a postdoctoral researcher during NC State. The paper was co-authored by Brandi Shaw, who participated in a work while an undergraduate during NC State. The work was finished with support from EFRI module by a National Science Foundation, underneath extend series 1240438.
Source: NSF, North Carolina State University
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