
Magnified image showing the pillared structure of a lotus leaf (left) and the new bioplastic (right). Images magnified 2000 times.
Inspired by the always immaculate lotus leaf, researchers have developed a self-cleaning bioplastic that is sturdy, sustainable and compostable.
The innovative plastic developed at RMIT University repels liquids and dirt – just like a lotus leaf – then breaks down rapidly once in soil.
RMIT PhD researcher Mehran Ghasemlou, lead author of the study published in Science of the Total Environment, said the new bioplastic was ideal for fresh food and takeaway packaging.
“Plastic waste is one of our biggest environmental challenges but the alternatives we develop need to be both eco-friendly and cost-effective, to have a chance of widespread use,” Ghasemlou said.
“We designed this new bioplastic with large-scale fabrication in mind, ensuring it was simple to make and could easily be integrated with industrial manufacturing processes.”
Ghasemlou said nature was full of ingeniously-designed structures that could inspire researchers striving to develop new high-performance and multifunctional materials.
“We’ve replicated the phenomenally water-repellent structure of lotus leaves to deliver a unique type of bioplastic that precisely combines both strength and degradability,” he said.
The bioplastic is made from cheap and widely-available raw materials – starch and cellulose – to keep production costs low and support rapid biodegradability.
The fabrication process does not require heating or complicated equipment and would be simple to upscale to a roll-to-roll production line, Ghasemlou said.
Naturally compostable
While biodegradable plastics are a growing market, not all bioplastics are equal. Most biodegradable or compostable plastics require industrial processes and high temperatures to break them down.
The new bioplastic does not need industrial intervention to biodegrade, with trials showing it breaks down naturally and quickly in soil.
“There are big differences between plant-based materials – just because something is made from green ingredients doesn’t mean it will easily degrade,” Ghasemlou said.
“We carefully selected our raw materials for compostability and this is reflected in the results from our soil studies, where we can see our bioplastic rapidly breaks down simply with exposure to the bacteria and bugs in soil.
“Our ultimate aim is to deliver packaging that could be added to your backyard compost or thrown into a green bin alongside other organic waste, so that food waste can be composted together with the container it came in, to help prevent food contamination of recycling.”
Lotus-inspired structures
Lotus leaves are renowned for having some of the most water-repellent surfaces on earth and are almost impossible to get dirty.
The secret lies in the leaf’s surface structure, which is composed of tiny pillars topped with a waxy layer.
Any water that lands on the leaf remains a droplet, simply rolling off with the help of gravity or wind. The droplets sweep up dirt as they slide down, keeping the leaf clean.
To make their lotus-inspired material, the RMIT team of science and engineering researchers first synthetically engineered a plastic made of starch and cellulosic nanoparticles.
The surface of this bioplastic was imprinted with a pattern that mimics the structure of lotus leaves, then coated with a protective layer of PDMS, a silicon-based organic polymer.
Tests show the bioplastic not only repels liquids and dirt effectively, but also retains its self-cleaning properties after being scratched with abrasives and exposed to heat, acid and ethanol.
Corresponding author, Professor Benu Adhikari, said the design overcomes key challenges of starch-based materials.
“Starch is one of the most promising and versatile natural polymers, but it is relatively fragile and highly susceptible to moisture,” Adhikari said.
“Through our bio-inspired engineering that mimics the ‘lotus effect’, we have delivered a highly-effective starch-based biodegradable plastic.”
Ghasemlou is currently working with a bioplastic company, which is evaluating further development of these novel water repellant materials. The RMIT research team is keen to collaborate with other potential partners on commercial applications for the bioplastic.
Original Article: Lotus effect: Self-cleaning bioplastics repel liquid and dirt
More from: Royal Melbourne Institute of Technology
The Latest on: Self-cleaning bioplastics
- Meet the Chinese fish robots that can ‘eat’ microplastics – and maybe help clean up oceanson July 2, 2022 at 4:00 am
Small bots developed by researchers at Sichuan University absorbed plastic pollutants in tests in shallow water The next step is to see if they can do it at greater depths and analyse the contaminants ...
- Bioplastic Textile Market Demand, Growth Rate, Recent Trends, Chain Structure, Supply and Demand Forecast to 2028on June 29, 2022 at 3:37 am
The MarketWatch News Department was not involved in the creation of this content. Jun 28, 2022 (Heraldkeepers) -- The trustworthy Bioplastic Textile Market report is packed with hard to find ...
- Make Every Pellet Count: Color concentrates or masterbatch? No easy answer.on June 28, 2022 at 5:00 pm
Resin makers who promote processors’ self-coloring of neutral polymer naturally favor ... batches using this new form at rates as low as 0.05% or less,” he says. Also, bioplastics won’t get short ...
- Hotel Toiletries in Bioplastic Packaging Serve the Eco-Friendly Traveleron June 28, 2022 at 5:00 pm
Public Goods offers a line of toxin-free personal care products in bioplastic packaging, some of which is reusable and refillable.
- Plasma Surface Cleaning Systems Market Expected to Witness a Significant Growth worth a CAGR of 6.0% to 2028 | 100 Pages Reporton June 21, 2022 at 10:21 pm
Jun 22, 2022 (The Expresswire) -- "Plasma Surface Cleaning Systems Market" 2022 aims to give detailed analysis of market opportunities, industry ...
- The surprising new materials for rebuilding our worldon June 14, 2022 at 12:56 am
Thankfully, bioplastics could be one part of the solution ... Researchers at Delft University of Technology created self-healing concrete by embedding bacterial spores, which are like seeds ...
- Bioplastic made with vanilla bean extract self-destructs under UV lighton June 14, 2022 at 12:29 am
Scientists have created a new form of bioplastic that appears to walk this line, relying on a vanilla bean extract to remain stable throughout its lifetime and self-destruct on command in response ...
- Husky demos revolutionary self-cleaning mold technology for HyPET HPP5on June 5, 2022 at 5:00 pm
Believe it. At NPE2015, Husky Injection Molding Systems Ltd. (Bolton, ON, Canada) is providing live demonstrations of its revolutionary new self-cleaning mold technology for the HyPET HPP5 preform ...
- The largest plant in the world is an ancient self-cloning sea grasson June 1, 2022 at 3:41 am
Shark Bay, an Australian World Heritage Area, serves as home to various animals that feed on its thriving sea grass. Turns out that sea grass called Poseidon's ribbon weed, or Posidonia australis ...
- The Cities of Tomorrow Will be Populated With “Bio Houses”on December 5, 2017 at 2:57 am
Bioplastics are produced by bacteria using ... Wall sections in the rooms are replaced with bioreactors, self-contained microbial systems. One type of bioreactor is a fuel cell that houses ...
via Bing News
The Latest on: Self-cleaning bioplastics
via Google News
Add Comment