The Environmental Impact of Engineered Nanomaterials

Kulinowski, Kristen M.; Colvin, Vicki L.

doi:10.1021/bk-2005-0890.ch004

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…, polymers or metal ions) can be effective in inhibiting microbial attachment and biofouling formation. , Biomimetic SWCNT coatings were applied to disinfect antimicrobial surfaces . The advent of engineered CNTs in commercial and industrial applications raised concerns about the potential impacts of CNTs on human health and environmental safety. − From a scientific point of view, the best strategy for maximizing CNTs’ application potentials while minimizing their risks, is to have a better insight in their toxicity mechanism. Based on such a mechanistic understanding, synthesis, purification, and functionalization procedures can be modified to avoid the specific features of CNTs that cause toxicity …”

Section: Introductionmentioning

confidence: 99%

Sharper and Faster “Nano Darts” Kill More Bacteria: A Study of Antibacterial Activity of Individually Dispersed Pristine Single-Walled Carbon Nanotube

et al. 2009

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To further our understanding on the antibacterial activity of single-walled carbon nanotubes (SWCNTs), high purity SWCNTs with average diameter of 0.83 nm and (7,5) chirality as dominate (n,m) structure were dispersed in a biocompatible surfactant solution. Ultraviolet-visible-near-infrared radiation absorption spectroscopy was employed to monitor the aggregation of SWCNTs. The results demonstrated that individually dispersed SWCNTs were more toxic than SWCNT aggregates toward bacteria (gram-negative Escherichia coli, Pseudomonas aeruginosa, and gram-positive Staphylococcus aureus, Bacillus subtilis). Individually dispersed SWCNTs can be visualized as numerous moving "nano darts" in the solution, constantly attacking the bacteria; thereby, degrading the bacterial cell integrity and causing the cell death. Controlled experimental results suggested that inhibiting cell growth and oxidative stress were not the major causes responsible for the death of cells. Furthermore, the detrimental effects of Co metal residues (up to 1 mug/mL) on SWCNT samples can be ruled out. Atomic force microscope study conducted in suspension proved that the death rates of bacteria were strongly correlated with their mechanical properties; soft cells were more vulnerable to SWCNT piercing. The antibacterial activity of SWCNTs can be remarkably improved by enhancing the SWCNT physical puncture on bacteria in the following ways: (1) dispersing SWCNTs individually to sharpen the nano darts; (2) increasing SWCNT concentration to raise the population density of nano darts; and (3) elevating the shaking speed of incubation to speed up the nano darts. This study elucidated several factors controlling the antibacterial activity of pristine SWCNTs and it provided an insight in developing strategies that can maximize the SWCNT application potentials while minimizing the health and environment risks.

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Section: Introductionmentioning

confidence: 99%

Sharper and Faster “Nano Darts” Kill More Bacteria: A Study of Antibacterial Activity of Individually Dispersed Pristine Single-Walled Carbon Nanotube

et al. 2009

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“…As such, they have resulted in several workshops and conferences. ICON's third project-the GoodNanoGuideis an internet based collaboration platform designed to help experts in the field of nanotechnology to exchange ideas on how best to handle nanomaterials safely [79].…”

Section: International Council On Nanotechnologymentioning

confidence: 99%

“…The key objective of the GoodNanoGuide is to establish an open forum that complements other nanotechnology information projects by providing up-to-date information on good practices for handling of nanomaterials in an occupational setting. The GoodNanoGuide is freely accessible for everyone, but only experts who are members of the GoodNanoGuide are able to post information [79]. The forum has attracted a wide range of stakeholders to collaborate and contribute at both intellectual and financial levels.…”

Section: International Council On Nanotechnologymentioning

confidence: 99%

Transactional Arrangements in the Governance of Emerging Technologies: The Case of Nanotechnology

Kica¹,

Wessel²

2017

Embedding New Technologies Into Society

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The different N concentrations induced cytocompatibility and hemocompatibility of MWCNTs with CNx coatings

Zhao

Guo

et al. 2013

Surface and Coatings Technology

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The Environmental Impact of Engineered Nanomaterials

Cited by 4 publications

References 11 publications

Sharper and Faster “Nano Darts” Kill More Bacteria: A Study of Antibacterial Activity of Individually Dispersed Pristine Single-Walled Carbon Nanotube

Sharper and Faster “Nano Darts” Kill More Bacteria: A Study of Antibacterial Activity of Individually Dispersed Pristine Single-Walled Carbon Nanotube

Transactional Arrangements in the Governance of Emerging Technologies: The Case of Nanotechnology

The different N concentrations induced cytocompatibility and hemocompatibility of MWCNTs with CNx coatings

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