Nanotoxicity and Pulmonary Toxicity of Hard Metal Nanoparticles

Hard metal nanoparticles, notably tungsten carbide (WC) and cobalt-doped tungsten carbide (WC-Co), are extensively employed in cutting tools, wear-resistant coatings and emerging energy technologies. Their sub-100 nm dimensions and high density facilitate deep lung penetration upon inhalation, raising concerns over pulmonary inflammation, barrier disruption and systemic metal ion distribution. Toxicity arises from a combination of particle-surface reactivity, oxidative dissolution and release of metal ions, particularly W⁶⁺ and Co²⁺. These species can generate reactive oxygen species, impair epithelial integrity, activate pro-inflammatory cascades and induce genotoxic lesions in bronchial and alveolar cells. Dose, exposure duration, particle composition and size all modulate the extent of cytotoxicity and pulmonary response. Understanding these parameters is crucial for occupational health risk assessment and the development of safer materials in industrial and fusion-energy settings.

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Nanotoxicity and Pulmonary Toxicity of Hard Metal Nanoparticles publication trend

The graph below shows the total number of articles in nanotoxicity and pulmonary toxicity of hard metal nanoparticles across all publications each year (not limited to Nature Index journals).

Technical terms

Nanotoxicity: Adverse biological effects arising from exposure to nanoscale materials, often through oxidative stress or membrane disruption.

Pulmonary toxicity: Damage or functional impairment of the lung and airways caused by inhaled substances, including inflammation and epithelial barrier breakdown.

Hard metal nanoparticles: Nanometre-sized particles composed of refractory metals or metal carbides, valued for hardness and wear resistance but posing inhalation risks.

Tungsten carbide (WC): A ceramic-like compound of tungsten and carbon used in cutting tools; nanoparticles can dissolve to release W⁶⁺ ions.

WC-Co nanoparticles: Cobalt-doped tungsten carbide particles combining WC hardness with Co binder properties; exhibit enhanced cytotoxicity due to cobalt ion release.

Reactive oxygen species (ROS): Chemically reactive molecules containing oxygen, generated by metal ions or particle surfaces, which can damage cellular components.

Lactate dehydrogenase (LDH) assay: A biochemical test measuring LDH release from damaged cells as an indicator of membrane integrity loss and cytotoxicity.

References

1. The Cytotoxicity of Tungsten Ions Derived from Nanoparticles Correlates with Pulmonary Toxicity. Toxics (2023).
2. In vitro analysis of the cytotoxic effect of two different sizes ITER-like tungsten nanoparticles on human dermal fibroblasts. Heliyon (2023).
3. Toxicity of Tungsten Carbide and Cobalt-Doped Tungsten Carbide Nanoparticles in Mammalian Cells in Vitro. Environmental Health Perspectives (2008).