Structural features of natural and acids modified chrysotile nanotubes

Sprynskyy, Myroslav; Niedojadło, Janusz; Buszewski, Bogusław

doi:10.1016/j.jpcs.2011.05.013

Cited by 24 publications

(8 citation statements)

References 71 publications

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“…The density of Yasniy chrysotile is 2.578 (0.002) g.cm -³, which is consistent with those reported in the literature, i.e., 2.5-2.6 g.cm -³ (Thomassin et al 1997;Jolicoeur and Duchesne 1981;Jaurand et al 1983;Sprynskyy et al 2011).…”

Section: Resultssupporting

confidence: 87%

Characterization and assessment of the potential toxicity/pathogenicity of Russian commercial chrysotile

Giuseppe

Zoboli

Nodari

et al. 2021

American Mineralogist

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Today, cancer is one of the main health issues faced in the workplace, with asbestos an important carcinogen in the occupational environment. Among the asbestos minerals, chrysotile is the main species of socio-economic and industrial relevance. Although chrysotile asbestos is classified as a “carcinogenic substance” by the International Agency for Research on Cancer (IARC), this fiber is still mined and used in Russia. The effective health hazard posed by the Russian commercial chrysotile has not been quantitatively assessed to date. In this work, the potential toxicity/pathogenicity of Russian chrysotile was quantitatively determined using the fiber potential toxicity index (FPTI) model. This model was applied to a representative commercial chrysotile from the Orenburg region, Russia, whose morphometric, crystal-chemical, surface activity, and biodurability related parameters were determined. We have quantitatively assessed that the toxicity/pathogenicity potential of Russian chrysotile (FPTI = 2.4) is lower than that of amphibole asbestos species but higher than the threshold limit set for “safe” mineral fibers (FPTI = 2.0), although it does not contain impurities of amphibole asbestos. Differences with other chrysotile samples were discussed, and it was found that the investigated Russian commercial chrysotile shares several features with the Italian Balangero chrysotile, indicating that widespread concern on commercial Russian chrysotile is justified.

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Section: Resultssupporting

confidence: 87%

Characterization and assessment of the potential toxicity/pathogenicity of Russian commercial chrysotile

Giuseppe

Zoboli

Nodari

et al. 2021

American Mineralogist

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“…Layered Mg-hydrosilicate Mg 3 Si 2 O 5 (OH) 4 (MgNTs) and Ni-hydrosilicate NTs Ni 3 Si 2 O 5 (OH) 4 (NiNTs) with tubular morphology, as shown by Sprynskyy and coworkers 2011, were synthesized by the research group at the Institute of Silicate Chemistry. 26 The Mg 3 Si 2 O 5 (OH) 4 NTs were prepared, using hydrothermal synthesis at a temperature of 350°C under a pressure of 70 MPa in a 1 wt % NaOH solution for different time periods (from 24 to 1440 h). 25 The initial components used for the synthesis were mixtures of magnesium oxide (analytical grade) and silicon oxide (KSMG silica gel, GOST (State Standard) 3956-76) in the ratio MgO: SiO2 = 3:2.…”

Section: Synthesismentioning

confidence: 99%

Synthetic hydrosilicate nanotubes induce low pro‐inflammatory and cytotoxic responses compared to natural chrysotile in lung cell cultures

Skuland

Масленникова

Låg

et al. 2019

Basic Clin Pharma Tox

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Asbestos (Mg‐hydrosilicate; chrysotile) is known to cause pleural diseases, pulmonary fibrosis and lung cancers, via mechanisms strongly depending on diameter‐length ratio and possibly metal content. A critical question is whether synthetic hydrosilicate nanotubes (NTs) of short length possess little toxic potential compared to chrysotile. Five Mg‐ and two NiNTs of different lengths were assessed for cytotoxicity and pro‐inflammatory responses in THP‐1 macrophages and human bronchial epithelial lung cells (HBEC3‐KT), in comparison with chrysotile. NT lengths/diameters were characterized by TEM, surface areas by BET‐ and BJH analysis, and chemical composition by XRD. The different Mg‐ and NiNTs induced little cytotoxicity in both cell models, in contrast to chrysotile that induced marked cytotoxicity. The two longest synthetic MgNTs, with median lengths of 3 and 5 µm, induced increased levels of pro‐inflammatory cytokines in THP‐1 macrophages, but much less than chrysotile (median length 15 µm) and silica nanoparticles (Si10). The shortest NTs did not induce any increase in cytokines. In HBEC3‐KT cells, all synthetic NTs induced no or only small changes in cytokine responses, in contrast to chrysotile and Si10. The synthetic NTs induced lower TGF‐β responses than chrysotile in both cell models. In conclusion, the pro‐inflammatory responses were associated with the length of synthetic hydrosilicate NTs in THP‐1 macrophages, but not in HBEC3‐KT cells. Notably, the shortest NTs showed no or little pro‐inflammatory activity or cytotoxicity in both cell models. Such a safety by design approach is important for development of new materials being candidates for various new products.

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“…4b), the hysteretic loops were observed for relative pressures ranging from 0.4 to 0.8, because of the capillary condensation effect of mesoporosity [12]. But the loop type of the stage can also correspond to the partially blocked channels [21]. The amount of adsorbed gas increased rapidly at the high pressure (0.8~1.0), which was attributed to open mesopores and macropores [21].…”

Section: Resultsmentioning

confidence: 97%

“…At P/Pº close to 1.0, a small variation of volume was observed. And very low N 2 adsorption at the initial relative pressure (P/Pº) indicated the practical absence of micropores in the short chrysotile fibers [21]. For the fibri-form silica (Fig.…”

Section: Resultsmentioning

confidence: 97%

Preparation and Characterization of Fibri-Form Silica from Short Chrysotile Fibers by Mix-Roasting

Song

Peng

Sun

et al. 2014

MSF

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Fibri-form silica was extracted from short chrysotile fibers by mix-roasting with ammonium bisulfate. The fibri-form silica were characterized by X-ray fluorescence analysis (XRF), X-ray diffraction (XRD), thermogravimetry and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR) and N2 adsorption isotherms. The results show that the fibri-form silica with disordered crystalline structure, but also in fibrous morphology. The surface area and pore volume of fibri-form silica are 181.66 m2/ g and 0.44 cc/ g, respectively. The structure of fibri-form silica is stable, no phase transformed from 50 to 1200 oC.

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Structural features of natural and acids modified chrysotile nanotubes

Cited by 24 publications

References 71 publications

Characterization and assessment of the potential toxicity/pathogenicity of Russian commercial chrysotile

Characterization and assessment of the potential toxicity/pathogenicity of Russian commercial chrysotile

Synthetic hydrosilicate nanotubes induce low pro‐inflammatory and cytotoxic responses compared to natural chrysotile in lung cell cultures

Preparation and Characterization of Fibri-Form Silica from Short Chrysotile Fibers by Mix-Roasting

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