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Nassrallah-Aboukaïs, N.; Jacquemin, Johan; Decarne, C.; Abi‐Aad, Edmond; Lamonier, Jean‐François; Aboukaı̈s, Antoine

doi:10.1023/a:1026361332394

Cited by 13 publications

(4 citation statements)

References 19 publications

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“…During the heating of vaterite particles, thermal transformation and decomposition occurs. The exothermic transformation of vaterite into calcite takes place at temperatures between 395 and 540 • C [6,35,36]. The exact transformation temperature of vaterite into calcite depends on the particle characteristics, the presence of additives, and the heating rate.…”

Section: Vaterite Propertiesmentioning

confidence: 99%

“…The exact transformation temperature of vaterite into calcite depends on the particle characteristics, the presence of additives, and the heating rate. The shift of the vaterite transformation to a lower temperature may be observed when calcite is present in the sample [35,36] or in the case of the incorporation of organic molecules or foreign ions into the vaterite particles [6,37]. Also, the coexistence of pure vaterite and vaterite in contact with the calcite phase (e.g., vaterite particles covered by a calcite layer) [36] can cause the appearance of a broad range of transformation temperatures.…”

Section: Vaterite Propertiesmentioning

confidence: 99%

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Synthesis Methods and Favorable Conditions for Spherical Vaterite Precipitation: A Review

Konopacka-Łyskawa

2019

Crystals

104

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Vaterite is the least thermodynamically stable anhydrous calcium carbonate polymorph. Its existence is very rare in nature, e.g., in some rock formations or as a component of biominerals produced by some fishes, crustaceans, or birds. Synthetic vaterite particles are proposed as carriers of active substances in medicines, additives in cosmetic preparations as well as adsorbents. Also, their utilization as a pump for microfluidic flow is also tested. In particular, vaterite particles produced as polycrystalline spheres have large potential for application. Various methods are proposed to precipitate vaterite particles, including the conventional solution-solution synthesis, gas-liquid method as well as special routes. Precipitation conditions should be carefully selected to obtain a high concentration of vaterite in all these methods. In this review, classical and new methods used for vaterite precipitation are presented. Furthermore, the key parameters affecting the formation of spherical vaterite are discussed.

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Section: Vaterite Propertiesmentioning

confidence: 99%

Section: Vaterite Propertiesmentioning

confidence: 99%

Synthesis Methods and Favorable Conditions for Spherical Vaterite Precipitation: A Review

Konopacka-Łyskawa

2019

Crystals

104

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“…Thermal decomposition of CaCO 3 occurs between ≈450 and 700 °C, but it can vary depending on polymorph, heating rate, particle size, and distribution. [ 16–18 ] Vaterite generally remains stable until ≈450 °C. Calcite generally remains stable until ≈700 °C.…”

Section: Results and Analysismentioning

confidence: 99%

“…Calcite generally remains stable until ≈700 °C. [ 18 ] Aragonite is not thermodynamically stable at standard temperature and pressure, [ 19 ] so it was unlikely to have formed in the mineralized SCOBY cellulose aerogels.…”

Section: Results and Analysismentioning

confidence: 99%

Biomineralization of Symbiotic Cultures of Bacteria and Yeast (SCOBY) Cellulose Aerogels

Jones

Srubar

2022

Adv Eng Mater

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Microbial biomineralization is explored as a strategy for improving the thermal stability of symbiotic cultures of bacteria and yeast (SCOBY) cellulose aerogels. Cellulose pellicles were grown in kombucha tea and subsequently biomineralized with Sporosarcina pasteurii (S. pasteurii). The samples were exposed to one, two, or three cycles of ureolytic biomineralization. The microstructure and material properties of biomineralized samples were compared to experimental controls, which included a non‐biomineralized cellulose aerogel sample and an abiotic cellulose aerogel sample that was exposed to the biomineralization treatment without the addition of S. pasteurii. Results indicate that significant biomineralization (up to 38% CaCO3 by mass) occurred in the biomineralized SCOBY cellulose aerogels. Multiple biomineralization cycles enhance biomineralization of the sample surface and interior. Thermal conductivities of resultant aerogels measured ≈0.043–0.057 Wm−1 K−1 for all samples, indicating that biomineralization did not negatively affect the thermal conductivity of the SCOBY cellulose aerogels. Results further illustrate that biomineralization improved the thermal stability and flame resistance of SCOBY cellulose aerogels compared to experimental controls. Low thermal conductivity, improved thermal stability, and higher flame resistance of biomineralized SCOBY cellulose aerogels together indicate that thermally stable insulation materials can be produced exclusively from biological organisms.

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Incorporation of Chromate into Calcium Carbonate Structure During Coprecipitation

Hua

Deng

Thornton

et al. 2006

Water Air Soil Pollut

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To rigorously assess treatment technologies and establish regulatory framework for chromatecontaminated site remediation, it is useful to know the exact chromium speciation in soil matrices. In an earlier study, Thornton, E. C., & Amonette, J. E. (1999). Hydrogen sulfide gas treatment of Cr(VI)-contaminated sediment samples from a plating-waste disposal siteimplications for in-situ remediation. Environmental Science & Technology, 33, 4096-4101, reported that some chromate in the bulk particles was not accessible to gaseous reductants or solution-phase extractants, based on XANES studies. We hypothesized that part of this non-extractable chromate may reside in the structure of minerals such as calcium carbonate. To test this hypothesis, a number of calcium carbonate precipitates were prepared in the presence of various concentrations of chromate during the precipitation, which could coprecipitate chromate, or by adding chromate after the precipitation was completed. Hydrochloric acid was used to dissolve calcium carbonate and therefore extract the coprecipitated and surface attached chromate. The results showed that the coprecipitated chromate was non-extractable by hot alkaline solution or phosphate buffer, but could be solubilized by HCl in proportional to the amount of calcium carbonate dissolved. The X-ray diffraction experiments revealed that the coprecipitation of chromate with calcium carbonate had an influence on its crystal structure: The higher the chromate concentration, the greater the ratio of vaterite to calcite.

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Untitled

Cited by 13 publications

References 19 publications

Synthesis Methods and Favorable Conditions for Spherical Vaterite Precipitation: A Review

Synthesis Methods and Favorable Conditions for Spherical Vaterite Precipitation: A Review

Biomineralization of Symbiotic Cultures of Bacteria and Yeast (SCOBY) Cellulose Aerogels

Incorporation of Chromate into Calcium Carbonate Structure During Coprecipitation

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