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    Breaking News

    UBC Okanagan: Mold Can Infiltrate, Weaken Bio-composite Materials

    ...

    UBC Okanagan: Mold Can Infiltrate, Weaken Bio-composite Materials
    UBC researcher Bryn Crawford holds a sample sheet made with flax bio-waste. The black spots on the sheet indicate mold growth.
    01.11.18
    At UBC Okanagan’s School of Engineering, mold is proving increasingly important in the domain of engineering materials and can lead to early deterioration and structural failure. This is especially the case as manufacturers adopt more bio-derived materials in the drive towards a greener future, according to researcher Bryn Crawford.

    At UBC’s Okanagan campus, a multi-disciplinary team of researchers from the Composites Research Network and the Department of Biology, in collaboration with MIT and the National Research Council of Canada, have been studying the development and application of bio-sourced composites—specifically flax and hemp fibers. These materials are plentiful in Canada and can be mixed with other materials to create cheaper, recyclable, and effective composite material products that are used by a range of industries, including in transportation.

    “Canada has a lot of biomass that can be used to produce materials that are both light and inexpensive,” Crawford said. “We’re looking at ways of using biomass in engineering, but there is a level of natural deterioration in these products that is still not fully understood.”

    In the study, researchers conducted a number of experiments to determine if and when mold will grow on bio-materials and how it might affect the final product.

    “When we bring microbiology into engineering, it raises some extra questions; some questions we’ve never thought about before,” Crawford said. “But because we’re now using biological matter, we have to think of fungal growth and how this fungal growth will affect a product.”

    The research team examined flax and hemp fibers alongside other natural materials to determine what would happen over time to these fibers. They created ‘fiber sheets’ and then added fungi to some, water to others, and left another group of sheets untreated.

    Crawford said they are not surprised that the materials grew mold; the idea of the project was to determine the types of environment where the fungal spores would grow and then test mechanical properties of the affected materials. The team conducted a variety of tests examining them for strength, stiffness, or the amount of energy that can be absorbed before the materials failed. They also used scanning electron microscopy to take an extreme close-up of the interior of the sample to determine fungal growth patterns, examine fractures, and failure zones.

    “It was a huge experiment and we found that in both the hemp and flax fibers, when no fungi were added, we still had fungi growing,” Crawford added. “Basically, when raw natural fibers are exposed to high relative humidity, mold will grow and the potential for premature structural failure can occur.”

    Crawford said that this susceptibility to mold growth is important for supply chains and factories to understand and manage in order to ensure they’re creating robust products.

    “Bio-composites made from natural fibers are good for both the environment and the economy and could help usher in the next revolution in manufacturing. More inter-disciplinary research of this kind is vital to producing high-quality and durable bio-materials that help make that leap.”

    The research was recently published in Materials and was partially funded by the Natural Sciences and Engineering Research Council of Canada and the Fonds de recherche du Québec—Nature et technologies. It was conducted in collaboration with Sepideh Pakpour, Negin Kazemian, John Klironomos, Karen Stoeffler, Denis Rho, Joanne Denault and Abbas Milani.
     


    Photo courtesy UBC
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