Published in Nature Communications, the research outlines a scalable, single-step method that uses controlled fluid flow to direct the growth of cellulose-producing bacteria. The result: nanofiber alignment in real time, producing biopolymer sheets with tensile strength up to 436 MPa, and 553 MPa when enhanced with boron nitride nanosheets — surpassing many synthetic composites in both strength and thermal conductivity.
Plastic pollution persists because synthetic polymers break down into harmful microplastics. Bacterial cellulose, one of Earth’s most abundant and pure biopolymers, offers a biodegradable alternative — and now, we’ve unlocked its full potential.
The challenge with bacterial cellulose has long been its random fiber orientation, which limits mechanical performance. By introducing a rotational bioreactor, the team leveraged fluid shear forces to align the motion of Novacetimonas hansenii, a cellulose-producing bacteria.
“Our approach involved developing a rotational bioreactor that directs the movement of cellulose-producing bacteria,” said M.A.S.R. Saadi, the study’s first author and a doctoral student at Rice. “This alignment significantly enhances the mechanical properties of microbial cellulose, creating a material as strong as some metals and glasses yet flexible, foldable, transparent and environment friendly.”
Beyond strength, the researchers infused hexagonal boron nitride nanosheets (BNNS) into the nutrient solution, enabling simultaneous material enhancement during biosynthesis. The resulting hybrid bionanocomposite offers three times faster heat dissipation than traditional BC — a promising feature for thermal management in green electronics.
“This dynamic biosynthesis approach enables the creation of stronger materials with greater functionality,” Saadi added. “The method allows for the easy integration of various nanoscale additives directly into the bacterial cellulose, making it possible to customize material properties for specific applications.”
The process is chemical-free, energy-efficient, and compatible with existing incubator equipment, making it immediately viable for industrial upscaling.
With its optical clarity, mechanical durability, and customizable nanoscale functionality, flow-aligned bacterial cellulose is poised to disrupt a wide range of markets:
“The synthesis process is essentially like training a disciplined bacterial cohort,” Saadi explained. “Instead of having the bacteria move randomly, we instruct them to move in a specific direction, thus precisely aligning their cellulose production.”
As the tech sector seeks low-impact alternatives to plastic films, PET layers, and synthetic polymers, this innovation arrives with high relevance for ESG-aligned industries.
“We envision these strong, multifunctional and eco-friendly bacterial cellulose sheets becoming ubiquitous,” Rahman said, “replacing plastics in various industries and helping mitigate environmental damage.”
The project was supported by the National Science Foundation, the U.S. Endowment for Forestry and Communities, and the Welch Foundation, underscoring a growing coalition behind biodegradable, scalable material solutions.
