Eco-friendly minibot skims water to clean oil spills at 95 per cent purity
Pods of robotic dolphins could be the environmental clean-up crew of the future as Aussie engineers test a minibot prototype that can hoover oil spills from water. Here’s how it works
READING LEVEL: ORANGE
Sea urchins spikes have inspired a team of Aussie engineers to build a remote-controlled minibot that hoovers up oil spills.
The minibot prototype’s* innovative* filtering system works to quickly separate oil from water after spills, which remain a serious problem around the world. Oil spills can badly damage oceans and coasts, kill or injure sea animals and birds, and cost billions of dollars to clean up and repair the damage.
The RMIT University team developed the “Electronic Dolphin” to help combat this global challenge. By collecting oil from the surface of water, the minibot offers a safer, more targeted response to spills in sensitive environments.
The mini device, shaped like a dolphin and about the size of a sneaker, relies on a specially designed filter that repels water while instantly absorbing oil, allowing the robot to skim across slicks and collect oil with high efficiency.
RMIT School of Engineering lead researcher Dr Ataur Rahman said the proof-of-concept minibot showed how small, adaptable devices could support clean-up efforts without exposing responders to hazardous* conditions.
“Oil spills can take a huge environmental and economic toll,” Dr Rahman said. “We wanted to create a system that can be deployed quickly, steered accurately and used in areas that are too risky for people to access.”
“We have a long-term vision of creating dolphin‑sized robots that can vacuum oil, return to base to empty their tanks, recharge, then redeploy automatically – repeating the cycle until the job’s done.”
The experimental minibot runs for about 15 minutes on its current battery, but the final version would scale up depending on pump size and oil‑storage capacity.
“Unlike past oil clean-up materials that often use harsh, hazardous chemicals and work only as fixed filters involving manual operation, our new technology is made using an eco-friendly coating for filter we developed.”
The minibot houses the coated filter at the front, with a small pump drawing oil through the filter into an onboard collection chamber. In controlled tests, it recovered oil at about two millilitres per minute with more than 95 per cent purity, maintaining performance without the filter becoming waterlogged.
The filter uses a special coating that grows tiny, sea urchin-like spikes you can only see under an electron microscope. These little spikes hold pockets of air that make water roll straight off, while oil sticks to the surface. That means the material can pick up oil without soaking up water. The material is also light and can be reused many times, making it practical for real clean-up work in the ocean.
PhD candidate Surya Kanta Ghadei, who largely led the development of materials, said the project was driven by both technical ambition and personal experience.
“Growing up in India, I saw the impact oil spills can have on marine life, especially turtles,” Mr Ghadei said.
“That stayed with me. When I began my PhD, I wanted to create something that could help responders act faster and keep wildlife out of danger.”
The team was now exploring how to scale* the technology by increasing the filter area across the robot’s surface, which would require a higher capacity pump. Field testing and long-term durability assessments were planned as the next stage of development.
Dr Rahman said the researchers were keen to work with industry and innovation partners to refine the design for specific applications and wider use.
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GLOSSARY
- prototype: the first example of a machine or other industrial product, from which all later forms are developed
- innovative: using new methods or ideas
- hazardous: dangerous, perilous, risky specifically in relation to health and safety
- scale: newer use of this term is to grow, expand and often relates to how to make an idea profitable
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QUICK QUIZ
- What is the minibot prototype designed to resemble?
- What negative consequences of oil spills are mentioned in the story?
- Memories of which marine animal impacted by spills has stayed with Mr Ghadei?
- How do the sea urchin-like spikes work?
- Where is the filter housed in the device?
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CLASSROOM ACTIVITIES
1. Oil spill effects
There are huge long-term effects that result from an oil spill in the ocean.
Write down what you know or think are the greatest problems under the following headings:
ENVIRONMENTAL IMPACTS
ECONOMICAL IMPACTS
Time: allow 15 minutes to complete this activity
Curriculum Links: English, Science, Personal and Social, Critical and Creative Thinking
2. Extension
What other countries may be interested in this new technology?
Do you think this could be a profitable invention? Explain why or why not.
Time: allow 10 minutes to complete this activity
Curriculum Links: English, Science, Design and Technologies, Personal and Social, Critical and Creative Thinking
VCOP ACTIVITY
Creative vocabulary
Find a bland sentence from the article to up-level. Can you add more detail and description? Can you replace any ‘said’ words with more specific synonyms?
Have you outdone yourself and used some really great vocabulary throughout your writing? Firstly, well done. Secondly, let’s ensure everyone can understand it by adding a glossary of terms. Pick three of your wow words and create a glossary for each word to explain what it means.