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Showing 1 to 20 of 29 for “"Calcium carbonate (CaCO3)"”.
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Admicellar Polymerization Of Calcium Carbonate And Its Performance In Drilling Fluids
… to form ultrafilm polystyrene on commercial calcium carbonate (CaCO3 ) of various particle sizes was studied. Adsorption isotherms of SDS decrease after the critical micelle concentration (CMC) of SDS was observed. This is explained by the phase behavior of SDS with calcium ion. The …
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Mapping of elastic modulus and hardness in Trochus niloticus seashell nacre by nanoindentation
… composed of mineral tablets of 95 weight % calcium carbonate (CaCO3) in the aragonite mineral form and a biomacromolecular organic matrix. Nanoindentation was carried out in a pattern of square grids of 256 indents at maximum loads of 1 mN and 500 gN. The average elastic modulus and hardness …
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Reef Carbonate Budgets & Symbiodiniaceae Diversity in the Arabian Gulf, Western Indian Ocean & Central Indo-Pacific
Coral reefs are the result of long-term net calcium carbonate (CaCO3) accretion and the balance between carbonate production and erosion, referred to as the carbonate budget. Coral calcification is influenced by environmental conditions (e.g. temperature, depth and ocean acidification) and depends …
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Biomimetic approach to anti-fouling surfaces
… able to reduce mineral scale deposition. Calcium carbonate (CaCO3) was deposited onto them and their performance compared with reference stainless steel surfaces. In addition, the anti-scaling performance of three commercially available coatings – DLC, Tech 100 and Tech 23 was also …
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The effect of calcium and magnesium on carbonate mineral precipitation during reactive transport in a model subsurface pore structure
Carbonate mineral precipitation in the subsurface at the interface of two advecting fluids can result in physical and chemical changes in the pore network. This can affect the effectiveness of various applications including carbon sequestration and in situ remediation. In this work we evaluate the …
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Calcium Carbonate Formation in Water Distribution Systems and Autogenous Repair of Leaks by Inert Particle Clogging
The formation of calcium carbonate (CaCO3) (i.e. scale) in potable water systems has long been a concern in water treatment and distribution. A literature review reveals that CaCO3 scaling issues are re-emerging due to climate change, temperature increases in hot water systems and lower use of …
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Hierarchical Assembly Strategy and Multiscale Structural Origin of Exceptional Mechanical Performance In Nacre
… exquisitely collecting mechanically inferior calcium carbonate (CaCO3) and biomolecules. The sandwich-like microarchitecture with a geometrically staggered arrangement can induce crack deflection along its biopolymer interface, thus significantly enhancing nacre's fracture toughness. Our new …
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Calcium Carbonate Particle Size Effects on Titanium Dioxide Light Scattering in Coatings
… of TiO2 with cheaper material such as calcium carbonate (CaCO3), which serves to occupy volume.</p> <p>The purpose of this study was to compare the coating spread rate of paints with varying TiO2 and CaCO3 pigment volume concentration (PVC). Different sized CaCO3 particles were used in …
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Modeling Departures From Abiotic Expectations During the Calcium Carbonate Precipitation Process
… factors responsible for the formation of calcium carbonate (CaCO3) in natural systems, quantifying the extent to which biological influences drive precipitation in carbonate depositional environments remains an unresolved problem. Thus, a quantitative understanding of …
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Sequestration of carbon dioxide (CO2) using bio-foamed concrete brick incorporating bacillus tequilensis bacteria
… properties of B-FCB via precipitation of calcium carbonate (CaCO3). The Bacillus tequilensis successfully isolated from cement kiln dust (CKD) to acclimatize in B-FCB. The B.tequilensis have the ability to produce carbonic anhydrase (CA) and urease enzymes to sequestrate CO2 and convert it …
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Synthesis and Multi-Scale Characterization of Calcium Silicate Hydrate at Multiple CaO/SiO2 Mixture Ratios
Calcium Silicate Hydrate (C-S-H) is the primary binding agent that is responsible for setting and hardening, strength, dimensional stability, and durability of Portland cement paste. Although Portland cement hydration produces C-S-H, Calcium hydroxide (CH), ettringite, and other hydration products …
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Coral biomineralization, climate proxies and the sensitivity of coral reefs to CO2-driven climate change
Scleractinian corals extract calcium (Ca2+) and carbonate (CO2−3) ions from seawater to construct their calcium carbonate (CaCO3) skeletons. Key to the coral biomineralization process is the active elevation of the CO2−3 concentration of the calcifying fluid to achieve rapid nucleation and growth …
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Influence of ureolytic bacteria (UB) on the engineering properties and microstructure behavior of interlocking compressed earth bricks (ICEB)
… with the control sample. Precipitation of calcium carbonate (CaCO3) in form of calcite can be distinguished clearly in microstructure analysis. As a conclusion, addition of 5% UB in ICEB promoted the highest increment in compressive strength and the lowest reduction in water absorption as …
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Marine Applications of an Autonomous Indicator-Based pH Sensor
… about data quality and can be used to model calcium carbonate (CaCO3) saturation states. The pH and pCO2 can be combined with a salinity-derived AT to model both long and short-term DIC variability. The SAMI-pH was also used to examine pH variability on Media Luna coral reef, Puerto Rico for …
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Marine Applications of an Autonomous Indicator-Based pH Sensor
… about data quality and can be used to model calcium carbonate (CaCO3) saturation states. The pH and pCO2 can be combined with a salinity-derived AT to model both long and short-term DIC variability. The SAMI-pH was also used to examine pH variability on Media Luna coral reef, Puerto Rico for …
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Microbial phylogenetic diversity preserved in facies-specific modern, recent, Holocene and Pleistocene hot-spring travertine deposits of Yellowstone and Turkey
… within modern-to-ancient terrestrial hot-spring calcium carbonate (CaCO3) limestone deposits called travertine. Microbial 16S rRNA gene sequences preserved within Modern travertine deposited within the Proximal Slope Facies (PSF) at Mammoth Hot Springs (MHS), Yellowstone National Park, has been …
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Microbial-Induced Calcium Carbonate Precipitation: from micro to macro scale
Microbial-Induced Calcium Carbonate (CaCO3) Precipitation (MICP) is a biological process in which microbial activities alter the surrounding aqueous environment and induce CaCO3 precipitation. Because the formed CaCO3 crystals can bond soil particles and improve the mechanical properties of soils …
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Effect of Bacterial Strain on MICP and its Application for the Erosion Control of Fine Sands
… In this context, microbial induced calcium carbonate (CaCO3) precipitation (MICP) could be used to enhance the erosion performance of soils. This research investigates the influence of the CaCO3 microstructure on the macromechanical erosion response of fine sands by combining …
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Multifunctional Hybrid Theranostic Nanoplatforms for Cancer Imaging and Therapy
… platform. We also developed monodispersed calcium carbonate (CaCO3) nanoparticles as a multifunctional pH-responsive nanoplatform. LS301, a tumor-targeting near-infrared fluorescent dye-peptide conjugate, and doxorubicin were loaded for fluorescence imaging and chemotherapeutic effects, …
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Environmental controls on the skeletal mineralogy of marine calcifiers
… organisms secrete skeletons consisting of calcium carbonate (CaCO3). The two principle CaCO3 polymorphs used by marine calcifiers are aragonite and calcite. In the abiotic precipitation of CaCO3, the Mg/Ca ratio and the temperature are established controls of polymorph formation, but the …
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