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  • Effect of low-temperature plasma treatment of

    Savelyeva et al. studied the deposition of porous CaCO 3 coatings on electrospun PCL fibres; 7 they obtained various structures and phase compositions of the CaCO 3 coatings by varying the growth conditions (incubation time and ultrasonic treatment). The vaterite-calcite transformation in CaCO 3 was induced by an increase in the number of ...

  • Characterisation of CaCO 3 phases during strain

    Author: Alexandra Clarà Saracho, Stuart K. Haigh, Toshiro Hata, Kenichi Soga, Stefan Farsang, Simon A. T. Re...
  • Surface Treatment of Calcite with Fatty Acids:

    2019-3-8  Thermogravimetric analysis was used to investigate the surface cleanliness of calcite fillers and to determine the optimal amount of fatty acid needed to coat the particles with an organic monolayer. The use of excess surfactant led to the formation of a bilayer as well as to the presence of free acid molecules. Both species could be detected by TGA.

  • Biomass-derived thermal preparation of calcite, from

    2020-6-30  Calcite is the most stable crystalline form of CaCO 3 and all other forms are interconverted into calcite by thermal treatment . The structural transformation of aragonite to stable calcite, is an endothermic process controlled by kinetics .

  • The influence of crystal modifiers on the crystallinity ...

    1. Introduction. Calcium carbonate (CaCO 3) is an extensive and versatile industrial filler that is used in various applications [].The annual production of ground minerals (e.g. calcite, limestone and chalk) and precipitated CaCO 3 powders amounts to 34 million tons in China, and the former accounts for two thirds of the production [].Apart from natural minerals, solid wastes from industrial ...

  • Calcite - an overview ScienceDirect Topics

    The morphological modifications in the absence and presence of l-aspartic acid as organic template that induce the nucleation of CaCO 3 were investigated [157].In the absence of l-aspartic acid in the reaction system, only calcite can be observed and the precipitate is bulky amorphous crystal with irregular shape (Fig. 7 A). While in the presence of the acid with a concentration of 0.25 mg/mL ...

  • Effect of Temperature Treatment on Electrical Property ...

    2020-4-14  nanofillers of CaCO 3 /polymer composites 2,6. Nanoparticle CaCO 3 fillers have an extremely large surface to volume ratio and may have considerably stronger reactions with the polymer matrix than their microparticle counterparts. CaCO 3 exists in three polymorphic forms: calcite, vaterite, and aragonite. Calcite crystallizes in the hexagonal ...

  • Preparation of mesoporous calcite with hierarchical ...

    2015-12-1  After the heating treatment of the selected precursors at 500 °C for 2 h, the new formed calcite perfectly inherits the morphologies and contextures of the precursors, as shown in Fig. 4a and b, suggesting that the precursors have good architecture stability. The N 2 adsorption–desorption isotherms of the calcite with different structures (Fig. 4c and d) both exhibit typical type-IV ...

  • PREPARATION AND CHARACTERIZATION OF CALCITE

    2019-7-8  composite blends. The effects of calcite reinforcement (with and without stearic acid treatment) on the microstructural, thermal and mechanical properties of neat PP and PE were investigated. Nano-CaCO 3 powders were characterized by means of Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). The PE and PP were

  • Synthesis and Characterisation of CaCO3 (Calcite) Nano ...

    2017-3-30  treatment ensured completion of the reaction. This limited the morphology of the particle to calcite, and had high energy consumption. Mechanical milling causes irregularities in particle shape and distribution. Liu et al. prepared nanosized CaCO 3 /SiO composite particles by the sol-gel process of CaCO 3 and Na 2 SiO

  • Characterisation of CaCO 3 phases during strain

    2020-6-23  Amorphous and crystalline CaCO 3 polymorphs. XRD analysis (Fig. 1a) revealed that calcite was the primary polymorph that precipitated in the presence of S. newyorkensis (SN01-0.3M), along with ...

  • Biotic Control of Skeletal Growth by Scleractinian

    位置: 8600 Rockville Pike, Bethesda, MD
  • Influence of temperature on microbially induced

    Microbially induced calcium carbonate precipitation (MICP) is a potential method for improvement of soil. A laboratory study was conducted to investigate the influence of temperatures for soil improvement by MICP. The ureolytic activity experiments, MICP experiments in aqueous solution and sand column using Sporosarcina pasteurii were conducted at different temperatures(10, 15, 20, 25 and 30°C).

  • Effect of low-temperature plasma treatment of

    2-plasma treatment of the PCL scaffold caused CaCO 3 to nucleate and precipitate much deeper inside the porous structure. From our findings, we conclude that O 2-plasma treatment is preferable for PCL scaffold surface modification from the viewpoint of use of the PCL/CaCO 3 composite as a drug delivery platform for tissue engineering ...

  • Biological responses of MC3T3-E1 on calcium

    2020-3-4  The CaCO 3 coating was then fabricated by hydrothermal treatment of roughened Ti into a solution of calcium citrate complexes and NaOH, as reported previously . The hydrothermal reactions were carried out in an oven at 120, 150 and 170 °C for 3 h. After the treatment, samples were washed in an ultrasonic bath containing distilled water for 5 min.

  • Clack Calcite Filtration Media Data Sheet - Pure Aqua, Inc.

    2016-12-10  Calcite is a naturally occurring calcium carbonate media. One of the advantages . of Calcite is its self-limiting property. When properly applied, it corrects pH only enough to reach a non-corrosive equilibrium. It does not overcorrect under normal conditions. Upon contact with Calcite, acidic waters slowly dissolve the

  • PREPARATION AND CHARACTERIZATION OF CALCITE

    2019-7-8  composite blends. The effects of calcite reinforcement (with and without stearic acid treatment) on the microstructural, thermal and mechanical properties of neat PP and PE were investigated. Nano-CaCO 3 powders were characterized by means of Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). The PE and PP were

  • Synthesis and Characterisation of CaCO3 (Calcite) Nano ...

    2017-3-30  treatment ensured completion of the reaction. This limited the morphology of the particle to calcite, and had high energy consumption. Mechanical milling causes irregularities in particle shape and distribution. Liu et al. prepared nanosized CaCO 3 /SiO composite particles by the sol-gel process of CaCO 3 and Na 2 SiO

  • (PDF) Remineralization of permeate water by calcite

    reacting with the CaCO 3 (post-treatment) [17]. The dissolution of calcite is a dynamic process, which may be enhanced or inhibited depending on the contactor design and influent water qualit y ...

  • The Use of Polymers to Improve Control of Calcium ...

    2020-1-17  phonate/polymer blends as CaCO 3 inhibitors. Results and Discussion It is generally agreed that conventional phosphorus-based and polymeric CaCO 3 scale inhibitors are effec-tive up to a maximum of 100x to 125x calcite saturation (equivalent to a LSI of 1.9 to 2.2). 5 The conditions in this study were 180x and 223x calcium saturation (equivalent

  • Biotic Control of Skeletal Growth by Scleractinian

    位置: 8600 Rockville Pike, Bethesda, MD
  • Biological responses of MC3T3-E1 on calcium

    2020-3-4  The CaCO 3 coating was then fabricated by hydrothermal treatment of roughened Ti into a solution of calcium citrate complexes and NaOH, as reported previously . The hydrothermal reactions were carried out in an oven at 120, 150 and 170 °C for 3 h. After the treatment, samples were washed in an ultrasonic bath containing distilled water for 5 min.

  • Forest soil solutions: Acid/base chemistry and

    Calcite (CaCO 3) treatment of 6.89 Mg/ha resulted in a significant increase of Ca 2+, ANC and pH in both Oa and Bs horizon soil solutions. Soil water response to CaC0 3 addition was most evident during the first year after treatment, apparently due to macropore transport of particulate and dissolved CaCO 3. However, increases in ANC and pH in ...

  • Corrosion Control: Calcite or Limestone Contactors for ...

    2018-4-4  Calcite or Limestone Contactors for Remineralization Downstream from Membrane Treatment ... experience in water treatment with just under 2500 installations. Our water treatment expertise includes applications in surface water, groundwater, tertiary water filtration, ... 2 + CaCO 3 → Ca+2 + 2HCO 3-Remineralization using calcite . and sulfuric ...

  • The Use of Polymers to Improve Control of Calcium ...

    2020-1-17  phonate/polymer blends as CaCO 3 inhibitors. Results and Discussion It is generally agreed that conventional phosphorus-based and polymeric CaCO 3 scale inhibitors are effec-tive up to a maximum of 100x to 125x calcite saturation (equivalent to a LSI of 1.9 to 2.2). 5 The conditions in this study were 180x and 223x calcium saturation (equivalent

  • Surface Modification and Planar Defects of Calcium ...

    位置: 8600 Rockville Pike, Bethesda, MD
  • CaCO3 scaling of oilfield produced water in ...

    2018-11-12  Further studies revealed that the addition of water treatment chemicals (Na 2 CO 3) in the mixing reactors induced the precipitates of CaCO 3, which could serve as crystal seeds and resulted in the continuous precipitation of calcium ions. Moreover, calcite saturation ratio increased from 0.97 to 3.94 could contribute to the rise of pH and ...

  • PREPARATION AND CHARACTERIZATION OF CALCITE

    2019-7-8  composite blends. The effects of calcite reinforcement (with and without stearic acid treatment) on the microstructural, thermal and mechanical properties of neat PP and PE were investigated. Nano-CaCO 3 powders were characterized by means of Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). The PE and PP were

  • Microbial calcite, a bio-based smart nanomaterial in ...

    2018-6-15  Microbial calcite, a bio-based smart nanomaterial in concrete remediation S.S. Banga*, J.J. Lipperta, U. Yerrab, S. Mulukutlab and V. Ramakrishnanb aDepartment of Chemical and Biological Engineering; bDepartment of Civil and Environmental Engineering, South Dakota School of Mines and Technology, City, SD 57701, USA

  • Microbial CaCO Precipitation for the production of

    2010-12-21  Calcite (CaCO3) is one of the most common and widespread minerals on Earth, constituting 4% by weight of the Earth’s crust. It is naturally found in extensive sedimentary rock masses, as limestone, marble and calcareous sandstones in marine, freshwater and terrestrial environments (Hammes and Verstraete, 2002; Klein and Hurlbut, 1999).

  • The effect of DTPA on calcium carbonate scale deposition ...

    2020-3-6  Water treatment. Scale CaCO 3 Calcite ABSTRACT Calcium carbonate (CaCO3) scale inhibition by Diethylenetriaminepentaacetic acid (DTPA) on copper and aluminium metal surfaces was studied at 60 and 100 C. The samples were characterized using X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy ...

  • Experimental investigations of preparation of calcite ...

    2017-5-26  parameters such as the time of treatment, power as amplitude, solid ratio, probe tip position and cycle on the particle size of calcite powder using by ultrasound. Experimental Materials The material in this experiment was a highly pure (99.6%) calcite (CaCO 3) from Nigde (Turkey). Its chemical composition is shown in Table 1.

  • Forest soil solutions: Acid/base chemistry and

    Calcite (CaCO 3) treatment of 6.89 Mg/ha resulted in a significant increase of Ca 2+, ANC and pH in both Oa and Bs horizon soil solutions. Soil water response to CaCO 3 addition was most evident during the first year after treatment, apparently due to macropore transport of particulate and dissolved CaCO

  • Microscale Analysis of Fractured Rock Sealed With ...

    Close‐up analysis of the calcite fill showed that the calcite grew perpendicular to the fracture plane, with each treatment cycle generating a layer of calcite. Each calcite layer is delineated by cavities with diameters ~0.5–1 um (cross section of a bacterial cell), which mark locations where bacteria became embedded (Figures 2g–2j).

  • Calcite in Thailand, Calcite Powder, White Calcite

    2017-3-27  Calcite Powder is a natural form of Calcium Carbonate with extremely high whiteness, purity and free flowing in nature. White Calcite Powder is widely used in plastics as filler, due to its high dispersibility, low oil absorption, high impact resistance, smooth surface finish, easy processing, compatibility with polymers and other organic ...

  • Protection and consolidation of stone heritage by self ...

    2017-8-17  XRD analyses of samples removed from treated areas showed that calcite was the only detectable calcium carbonate phase present, both before and after the self-inoculation bio-treatment (Fig. 6f ...

  • Crystallographic Control in the Replacement of Calcite by ...

    2016-11-28  structural or crystallographic control during CaCO 3−CaSO 4 transformation. For example, the lattice matching between calcite and the overgrowing gypsum has been claimed to promote a strong adhesion between both phases, thus making gypsum the main phase responsible for calcite surface passivation during AMD treatment.4,10 As well, there is strong

  • Remineralization of desalinated water DrinTec

    Treatment with limestone contactors and no pre CO 2 dosing: Trying to optain CCPP=0 is difficult as the water has reached saturation. An alternative option is to add NaOH. However, water with less alkalinity than 50 mg CaCO 3 /L and 0,6 mg CO 2 /L is very unstable and will tend towards a negative CCPP. The pH raises above 9 in less than 5 minutes

  • Recommended Method for Semi-quantitative

    2018-7-13  the sum of the calcite and dolomite peak heights – Ic/(Ic+Ia) – yields the x-variable. The polynomial: y = 9.1926x2 + 90.8447x gives the weight percent calcite of the mixture. The proportion of dolomite can be calculated by difference from 100%. In the case of a ternary mixture of calcite, aragonite, and dolomite, peak height data can be taken

  • Calcium Carbonate Precipitation in the Presence of ...

    2020-1-17  the 125X calcite saturation is 48 s com-pared to 20 s obtained for 223X calcite saturation. Effect of Phosphonates To study the effect of phosphonates on CaCO 3 precipitation at low-to-medium calcite saturation (150X and 180X), a series of experiments was performed in the presence of AMP, HEDP, and PBTC. Figure 2 shows the plots of CaCO 3 inhibi-