Hybrid Structures For Soft Robotics

University of Queensland develops 3D-printed liquid metal composites mimicking animal musculoskeletal systems for advanced medical applications.

In a groundbreaking advancement, researchers from the University of Queensland have created a 3D printing method to develop liquid metal robotics that emulate the strength and flexibility of animal musculoskeletal systems. Spearheaded by Dr Ruirui Qiao at the Australian Institute for Bioengineering and Nanotechnology (AIBN), this innovation holds immense potential for medical rehabilitation devices.

Dr Qiao’s team used a blend of soft liquid metal nanoparticles and rigid gallium-based nanorods to fabricate hybrid structures. “We set out to mimic the locomotion, flexibility, and control of mammalian movement,” said Dr Qiao. This research integrates the efficiency of animal-inspired mechanics into practical medical solutions, making it particularly valuable for healthcare professionals, prosthetics developers, and researchers in soft robotics.

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The research emphasises the composite’s adaptability under external stimuli like heat or infrared light. These materials can transform their shape and function, making them ideal for next-generation rehabilitation products such as precision grippers for prosthetic limbs.

Unlike traditional methods requiring multi-step processes, this technique simplifies manufacturing while broadening material selection. Dr Qiao explained, “We developed a new method to mimic animal physiology to benefit our own technology using a quick and simple manufacturing process.”

The study highlights the challenges of designing hybrid soft-rigid structures. Drawing inspiration from nature’s soft-bodied creatures, the team overcame these hurdles with a tuneable gallium-polymer composite. This innovation could be beneficial in the field of soft robotics, addressing long-standing limitations in flexibility and material integration.

Looking ahead, Dr Qiao aims to enhance the proportion of metal-based nanoparticles within composites. “This will further enhance responsive properties and ultimately improve the performance of hybrid soft robots,” she noted.

With its transformative potential, this research is poised to benefit industries focused on rehabilitation, assistive technology, and beyond.