Antibacterial effect of boron nitride flakes with controlled orientation in polymer composites
Journal article, 2019

Boron nitride (BN) is a stable 2D material with physiochemical properties similar to graphene-based nanomaterials. We have recently demonstrated that vertically aligned coatings of graphene-based nanomaterials provide strong antibacterial effects on various surfaces. Here we investigated whether BN, a nanomaterial with extensive similarities to graphene, might exhibit similar antibacterial properties. To test this, we developed a novel composite material using BN and low density polyethylene (LDPE) polymer. The composite was extruded under controlled melt flow conditions leading to highly structured morphology, with BN oriented in the extrusion flow direction. Nanocomposite extruded surfaces perpendicular to the flow direction were etched, thus exposing BN nanoparticles embedded in the matrix. The antimicrobial activity of extruded samples was evaluated against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus epidermidis and Staphylococcus aureus by the colony forming units (CFUs) counting method. Furthermore, the bactericidal effect of oriented BN against E. coli and S. aureus was evaluated by scanning electron microscopy (SEM) and live/dead viability assay. Our results suggest that BN nanoflakes on the extruded BN/LDPE composite physically interact with the bacterial cellular envelope, leading to irreparable physical damage. Therefore, we propose that BN–polymer composites might be useful to develop polymer based biomedical devices protected against bacterial adhesion, and thus minimize device associated infections.

Author

Santosh Pandit

Chalmers, Biology and Biological Engineering, Systems and Synthetic Biology

Karolina Gaska

Chalmers, Industrial and Materials Science, Engineering Materials

Venkata Raghavendra Subrahmanya Sar Mokkapati

Chalmers, Biology and Biological Engineering, Systems and Synthetic Biology

Sven Forsberg

2D fab AB

Magnus Svensson

Wellspect Healthcare

Roland Kádár

Chalmers, Industrial and Materials Science, Engineering Materials

Ivan Mijakovic

Chalmers, Biology and Biological Engineering, Systems and Synthetic Biology

Technical University of Denmark (DTU)

RSC Advances

2046-2069 (ISSN)

Vol. 9 57 33454-33459

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Life Science Engineering (2010-2018)

Materials Science

Subject Categories

Other Biological Topics

Medical Materials

Composite Science and Engineering

DOI

10.1039/c9ra06773f

More information

Latest update

12/5/2019