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Spider silk demonstrates Spider man-like abilities

Date:
January 31, 2017
Source:
American Institute of Physics
Summary:
Spider silk offers new inspiration for developments in artificial muscle technology. The silk of the Ornithoctonus Huwena spider demonstrates impressive weight-lifting abilities with efficient, water-driven actuation.
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Our muscles are amazing structures. With the trigger of a thought, muscle filaments slide past each other and bundles of contracting fibers pull on the bones moving our bodies. The triggered stretching behavior of muscle is inherently based in geometry, characterized by a decrease in length and increase in volume (or vice versa) in response to a change in the local environment, such as humidity or heat.

Variations of this dynamic geometry appear elsewhere in nature, exhibiting a variety of mechanisms and structures and inspiring development in artificial muscle technology. Spider silk, specifically Ornithoctonus Huwena spider silk, now offers the newest such inspiration thanks to research from a collaboration of scientists in China and the U.S., the results of which are published today in Applied Physics Letters, from AIP Publishing.

"Spider silk is a natural biological material with high sensitivity to water, which inspires us to study about the interaction between spider silk and water," said Hongwei Zhu, a professor in Tsinghua University's School of Material Science and Engineering in Beijing and part of the collaboration. "Ornithoctonus Huwena spider is a unique species as it can be bred artificially and it spins silk of nanoscale diameter."

Besides the shrink-stretch ability of muscles, the way in which the motion is triggered -- how the muscle is actuated -- is a key part of its functionality. These spider silk fibers, actuated by water droplets, showed impressive behavior in all the ways that matter to muscle performance (or to super heroes that may need them to swing from buildings).

"In this work, we reveal the 'shrink-stretch' behavior of the Ornithoctonus Huwena spider silk fibers actuated by water, and successfully apply it on weight lifting," said Zhu. "The whole process can cover a long distance with a fast speed and high efficiency, and further be rationalized through an analysis of the system's mechanical energy."

The research team looked at the actuation process in a few different scenarios, capturing the macro dynamics of the flexing fibers with high speed imaging. They actuated bare fibers on a flat surface (a microscope slide) and while dangling from a fixed point (held with tweezers) before adding a weight to the dangling configuration to test its lifting abilities.

Zhu and his group also investigated the micro structure of the proteins that make up the fibers, revealing the protein infrastructure that leads to its hydro-reflexive action.

Electron microscopy gave a clear picture of the smooth inner threads that make up the fibrous structure, and a laser-driven technique, called Raman spectroscopy, revealed the precise conformation of the protein folding structures making up each layer. Fundamentally, the specific molecular configurations, in this case having proteins that have a strong affinity for water and that rearrange in the presence of water, give rise to the spider silk's actuation.

"Alpha-helices and beta-sheets are two types of secondary protein folding structures in spider silk proteins," said Zhu. "Beta-sheets act as crosslinks between protein molecules, which are thought relevant to the tensile strength of spider silk. A-helices are polypeptide chains folded into a coiled structure, which are thought relevant to the extensibility and elasticity in spider silk protein."

Returning the fiber back to its relaxed state (as one-use muscles are far less useful) requires only removing the water, which offers conservation along with its simplicity. With some fine tuning, there is also potential for designing the precise behavior of the shrink-stretch cycle.

"In addition, as the falling water droplet can be collected and recycled, the lifting process is energy-saving and environmentally friendly," said Zhu. "This has provided the possibility that the spider silk can act as biomimetic muscle to fetch something with low energy cost. It can be further improved to complete staged shrink-stretch behavior by designing the silk fiber's thickness and controlling droplet's volume."

Understanding this remarkable material offers new insight for developing any of a number of drivable, flexible devices in the future.

"The interaction between matter and liquid may result in the structural changes of materials, which can be further applied to actuators, sensors and flexible devices," Zhu said.


Story Source:

Materials provided by American Institute of Physics. Note: Content may be edited for style and length.


Journal Reference:

  1. Shuyuan Lin, Jia Zhu, Xinming Li, Yang Guo, Yaopeng Fang, Huanyu Cheng, and Hongwei Zhu. Water-Driven Actuation of Ornithoctonus Huwena Spider Silk Fibers. Applied Physics Letters, 2017 DOI: 10.1063/1.4974350

Cite This Page:

American Institute of Physics. "Spider silk demonstrates Spider man-like abilities." ScienceDaily. ScienceDaily, 31 January 2017. <www.sciencedaily.com/releases/2017/01/170131104427.htm>.
American Institute of Physics. (2017, January 31). Spider silk demonstrates Spider man-like abilities. ScienceDaily. Retrieved May 25, 2017 from www.sciencedaily.com/releases/2017/01/170131104427.htm
American Institute of Physics. "Spider silk demonstrates Spider man-like abilities." ScienceDaily. www.sciencedaily.com/releases/2017/01/170131104427.htm (accessed May 25, 2017).

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