Bekele H. Badada, Teng Shi, Howard E. Jackson, Leigh M. Smith, Changlin Zheng, Joanne Etheridge, Qiang Gao, H. Hoe Tan and Chennupati Jagadish Click for full article
F. Withers, O. Del Pozo-Zamudio, S. Schwarz, S. Dufferwiel, P. M. Walker, T. Godde, A. P. Rooney, A. Gholinia, C. R. Woods, P. Blake, S. J. Haigh, K. Watanabe, T. Taniguchi, I. L. Aleiner, A. K. Geim, V. I. Fal’ko, A. I. Tartakovskii and K. S. Novoselov Click for full article
Lei Wang, Jinkyu Han, Yuqi Zhu, Ruiping Zhou, Cherno Jaye, Haiqing Liu, Zhuo-Qun Li, Gordon T. Taylor, Daniel A. Fischer, Joerg Appenzeller and Stanislaus S. Wong Click for full article
Arvind Balijepalli, Jessica Ettedgui, Andrew T. Cornio, Joseph W. F. Robertson, Kin P. Cheung, John J. Kasianowicz and Canute Vaz Click for full article
Background: Biofouling, the colonization of artificial and natural surfaces by unwanted microorganisms, has an important economic impact on a wide range of industries. Low cost antifouling strategies are typically based on biocides which exhibit a negative environmental impact, affecting surrounding organisms related and not related to biofouling. Considering that the critical processes resulting in biofouling occur in the nanoscale/microscale dimensions, in this work we present a bionanotechnological approach to reduce adhesion of biofilm-producing bacteria Halomonas spp. CAM2 by introducing single layer graphene coatings. The use of this nanomaterial has been poorly explored for antifouling application. Results: Our study revealed that graphene coatings modify material surface energy and electrostatic interaction between material and bacteria. Such nanoscale surface modification determine an important reduction over resulting bacterial adhesion and reduces the expression levels of genes related to adhesion when bacteria are in contact with graphene-coated material. Conclusions: Our results demonstrate that graphene coatings reduce considerably adhesion and expression levels of adhesion genes of biofilm-producing bacteria Halomonas spp. CAM2. Hydrophobic-hydrophilic interaction and repulsive electrostatic force dominate the interactions between Halomonas spp. CAM2 and material surface in saline media, impacting the final adhesion process. In addition no bactericide effect of graphene coatings was observed. The effect over biofilm formation is localized right at coated surface, in contrast to other antifouling techniques currently used, such as biocides.
Carolina Parra Click for full article