Fast-Growing Bacterial Cellulose with Outstanding Mechanical Properties via Cross-Linking by Multivalent Ions

Materials

Joachim Bill¹  Andrea Knöller¹  Marc Widenmeyer¹  Zaklina Burghard¹ 

[1] Institute for Materials Science, University of Stuttgart, 70569 Stuttgart, Germany;

关键词: kombucha;    bacterial cellulose;    membranes;    cross-linking;    mechanical properties;   

DOI  :  10.3390/ma13122838

来源: DOAJ

【 摘 要 】

Bacterial cellulose is an organic product of certain bacterias’ metabolism. It differs from plant cellulose by exhibiting a high strength and purity, making it especially interesting for flexible electronics, membranes for water purification, tissue engineering for humans or even as artificial skin and ligaments for robotic devices. However, bacterial cellulose’s naturally slow growth rate has limited its large-scale applicability to date. Titanium (IV) bis-(ammonium lactato) dihydroxide is shown to be a powerful tool to boost the growth rate of bacterial cellulose production by more than one order of magnitude and that it simultaneously serves as a precursor for the Ti⁴⁺-coordinated cross-linking of the fibers during membrane formation. The latter results in an almost two-fold increase in Young’s modulus (~18.59 GPa), a more than three-fold increase in tensile strength (~436.70 MPa) and even a four-fold increase in toughness (~6.81 MJ m⁻³), as compared to the pure bacterial cellulose membranes.

【 授权许可】

Unknown