Physicochemical dispersion of chrysotile

Yang, Huaming; Xiao, Yu; Liu, Kun; Yang, Yanxia; Feng, Qiming

doi:10.1016/j.colsurfa.2006.12.071

Cited by 13 publications

(3 citation statements)

References 26 publications

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“…These results are consistent with the results reported in the literature [18]. A small amount of brucite is present in the structure by the presence of a peak at 2θ = 18.60˚, corresponding to the (001) reflection.…”

Section: Resultssupporting

confidence: 93%

Synthesis of Mesoporous Material from Chrysotile-Derived Silica

Schwanke¹,

Lopes²,

Pergher³

2013

MSA

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Mesoporous MCM-41-type molecular sieves were synthesized using calcined and leached chrysotile and cetyltrimethylammonium bromide as the silica source and structure directing agent, respectively. Powder X-ray diffraction (XRD), N₂ isothermal adsorption-desorption, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were used to characterize the samples. The calcined and leached chrysotile can be employed as an inexpensive silica source for the formation of low-order MCM-41 mesoporous materials.

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Section: Resultssupporting

confidence: 93%

Synthesis of Mesoporous Material from Chrysotile-Derived Silica

Schwanke¹,

Lopes²,

Pergher³

2013

MSA

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“…The sharp diagnostic diffraction maxima of tremolite (8.14, 3.09 Å) and chrysotile (7.30, 3.63 Å), the fibrous crystal habit with regular outlines, and the ideal DTA-TG and Raman curves suggest well crystallized tremolite and chrysotile (Bloise et al, 2008;Yang et al, 2007;Sprynskyy et al, 2011;Schwartz et al, 2012), with average structural formulae of: (Na 0.07 K 0.03 )(Ca 1.68 Mg 0.18 Mn 0.01 )(Fe 0.42 Mg 4.55 Ti 0.01 ) (Si 7.60 Al 0.24 Fe 0.16 )O 22 (OH) 2 , and (Mg 5.55 Fe 0.41 Mn 0.006 )(Si 3.79 Al 0.13 )O 10 (OH) 8, respectively.…”

Section: Discussionmentioning

confidence: 97%

Characterization and distribution of fibrous tremolite and chrysotile minerals in the Eskişehir region of western Turkey

Kadır

Erkoyun

2015

Clay miner.

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Because of widespread tremolite and chrysotile minerals in Palaeozoic-Mesozoic metamorphic and Triassic ophiolitic units, respectively, in the Eskişehir region, Turkey, there is significant potential for development of cases of mesothelioma. Such occurrences in the Eskişehir region show a positive correlation with the concentration and dimension of tremolite crystals compared with those of chrysotile crystals. A detailed assessment of the mineralogy, geochemistry and genesis of these materials has not been carried out to date; the present study was undertaken to fill that gap. The sharp diagnostic basal reflections at 8.14 Å, 3.09 Å and at 7.30 Å, 3.63 Å, well defined fibrous crystallinity, and ideal differential thermal analysis-thermal gravimetric and Raman curves suggest the development of well crystallized fibrous/acicular tremolite and chrysotile with the average structural formulae of: (Na0.07K0.03)(Ca1.68Mg0.18Mn0.01)(Fe0.42Mg4.55Ti0.01)(Si7.60Al0.24Fe0.16)O22(OH)2, and (Mg5.55Fe0.41 Mn0.006)(Si3.79Al0.13)O10(OH)8, respectively.Enrichment of light rare earth elements relative to medium rare earth elements and heavy rare earth elements in tremolite compared to that of chrysotile which exhibits no anomaly and negative anomalies for Ba, Sr, Ce, Nb, Yand Zr in the tremolite samples and chrysotile, are responses to the fractionation of feldspar, glaucophane, pyroxene and olivine under the high temperatures of hydrothermal-alteration processes during serpentinization and the high-pressure conditions of metamorphism. Based on H and O isotope data, the tremolite and chrysotile are thought to have developed from tectonically controlled magmatic and meteoric hydrothermal systems and the formation temperatures of the tremolite are higher than those of chrysotile.

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“…Chrysotile (Figure 2) was composed of straight, thin, and flexible elongate particles, identifiable as asbestos due to their length/diameter ratio of more than 3 [34,35]. Individual elongate mineral particles presented a rough surface and measured less than 0.1 µm in length, thus being below the SEM resolution [36,37]. The asbestos particles were also observed using TEM.…”

Section: Electron Microscopymentioning

confidence: 99%

Quantitative Analysis of Asbestos-Containing Materials Using Various Test Methods

2020

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The advantages of X-ray powder diffraction (XRPD) analysis are its non-destructive nature, reliability, fast and easy sample preparation, and low costs. XRPD analysis has been used for mineral identification and the quantitative/qualitative determination of various types of fibrous minerals in asbestos-containing materials (ACMs). In order to test the detection limit of ACMs by XRPDD, standard samples with various concentrations of ACMs (0.1%, 1%, and 3%) were fabricated using three matrix materials (talc, vermiculite, and sepiolite). Asbestiform tremolite and chrysotile were identified in the XRPD profiles of the samples with 1% and 3% ACMs. Their integral intensities were positively correlated with the concentrations. However, the XRPD peak of asbestos was not found in the samples with 0.1% ACMs. Therefore, scanning and transmission electron microscopy were utilized to investigate the samples with a very low concentration of ACMs. Although the ACM concentration (0.1%) was negligible and its direct observation was time-consuming, electron microscopy allowed for the detection of asbestos in several matrix materials. Thus, a combination of XRPD and electron microscopy improve analytical performance and data reliability.

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Physicochemical dispersion of chrysotile

Cited by 13 publications

References 26 publications

Synthesis of Mesoporous Material from Chrysotile-Derived Silica

Synthesis of Mesoporous Material from Chrysotile-Derived Silica

Characterization and distribution of fibrous tremolite and chrysotile minerals in the Eskişehir region of western Turkey

Quantitative Analysis of Asbestos-Containing Materials Using Various Test Methods

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