Materials scientists learn how to make liquid crystal shape-shift

September 25, 2020

A new 3D-printing method will make it easier to manufacture and control the shape of soft robots, artificial muscles and wearable devices. Researchers at UC San Diego show that by controlling the printing temperature of liquid crystal elastomer, or LCE, they can control the material's degree of stiffness and ability to contract--also known as degree of actuation. What's more, they are able to change the stiffness of different areas in the same material by exposing it to heat.

As a proof of concept, the researchers 3D-printed in a single print, with a single ink, structures whose stiffness and actuation varies by orders of magnitude, from zero to 30 percent. For example, one area of the LCE structure can contract like muscles; and another can be flexible, like tendons. The breakthrough was possible because the team studied LCE closely to better understand its material properties.

The team, led by Shengqiang Cai, a professor in the Department of Mechanical and Aerospace Engineering at the UC San Diego Jacobs School of Engineering, details their work in the Sept. 25 issue of Science Advances.

Researchers were inspired to create this material with different degrees of actuation by examples in biology and nature. In addition to the combination of muscle and tendon, researchers took cues from the beak of the squid, which is extremely stiff at the tip but much softer and malleable where it is connected to the mouth of the squid.

"3D-printing is a great tool to make so many different things--and it's even better now that we can print structures that can contract and stiffen as desired under a certain stimuli, in this case, heat," said Zijun Wang, the paper's first author and a Ph.D. student in Cai's research group.

Understanding material properties

To understand how to tune the material properties of LCE, researchers first studied the material very closely. They determined that printed LCE filament is made of a shell and a core. While the shell cools off quickly after printing, becoming stiffer, the core cools more slowly, remaining more malleable.

As a result, researchers were able to determine how to vary several parameters in the printing process, especially temperature, to tune the mechanical properties of LCE. In a nutshell, the higher the printing temperature, the more flexible and malleable the material. While the preparation of the LCE ink takes a few days, the actual 3D print can be done in just 1 to 2 hours, depending on the geometry of the structure being printed.

"Based on the relationship between the properties of LCE filament and printing parameters, it's easy to construct structures with graded material properties," said Cai.

Varying temperature to 3D-printing structures

For example, researchers printed an LCE disk at 40 degrees C (104 F) and heated it up to 90 degrees C (194 F) in hot water. The disk deformed into a conical shape. But an LCE disk composed of areas that are printed at different temperatures (40, then 80 then 120 degrees Celsius, for example), deformed in a completely different shape when heated up.

Researchers also 3D-printed structures made of two layers of LCE with different properties and showed that this gave the material even more degrees of freedom to actuate. Researchers also printed lattice structures with the material, which could be used in medical applications.

Finally, as a proof of concept, the team 3D printed an LCE tube that they had tuned during 3D printing and showed that it could adhere to a rigid glass plate much longer when actuated at high temperatures, about 94 C (201 F), than a regular LCE tube with homogenous properties. This could lead to the manufacture of better robotic feet and grippers.

The actuation of the material could be activated not just in hot water but also by infusing LCE with heat-sensitive particles or particles that absorb light and convert it to heat--anything from black ink powder to graphene. Another mechanism would be to 3D print the structures with electric wires that generate heat embedded in LCE.

Next steps include finding a way to tune the material's properties more precisely and efficiently. Researchers also are working on modifying the ink so the printed structures can be self-repairable, reprogrammable, and recyclable.
-end-


University of California - San Diego

Related Artificial Muscles Articles from Brightsurf:

Muscles support a strong immune system
In the fight against cancer or chronic infections, the immune system must be active over long periods of time.

A better understanding of soft artificial muscles
Artificial muscles will power the soft robots and wearable devices of the future.

RoboBee powered by soft muscles
Harvard researchers have developed a resilient RoboBee powered by soft artificial muscles that can crash into walls, fall onto the floor, and collide with other RoboBees without being damaged.

How cancer breaks down your muscles
A solid tumor can cause muscle cells in the body to self-destruct.

Artificial muscles bloom, dance, and wave
Researchers from KAIST have developed an ultrathin, artificial muscle for soft robotics.

One or the other: Why strength training might come at the expense of endurance muscles
The neurotransmitter brain-derived neurotrophic factor (BDNF) acts in the muscle, so that during strength training endurance muscle fiber number is decreased.

Sheaths drive powerful new artificial muscles
Over the last 15 years, researchers at The University of Texas at Dallas and their international colleagues have invented several types of strong, powerful artificial muscles using materials ranging from high-tech carbon nanotubes (CNTs) to ordinary fishing line.

Fiber-based artificial muscles get new and powerful twists
Three papers in this issue demonstrate new fiber-based designs within the world of artificial muscles, showing how these twisted and coiled designs can be controlled via heat, electricity and chemistry.

Artificial 'muscles' achieve powerful pulling force
As a cucumber plant grows, it sprouts tightly coiled tendrils that seek out supports in order to pull the plant upward.

Artificial muscles powered by glucose
Artificial muscles made from polymers can now be powered by energy from glucose and oxygen, just like biological muscles.

Read More: Artificial Muscles News and Artificial Muscles Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.