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Influence of calcium sources on microbially induced calcium carbonate ...
Stimulation of microbially induced calcium carbonate precipitation (MICCP) is likely to be influenced by calcium sources. ... confirmed that the precipitate formed was CaCO3 and composed of predominantly calcite crystals with a little amount of aragonite and vaterite crystals. The maximum yield of calcite precipitation was achievable with ...
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CA2635233A1 - Novel manufacturing method of aragonite calcium carbonate ...
a method of manufacture of aragonite according to carbonation reaction to control the particle size and aspect ratio by using a suspension of calcium hydroxide, magnesium chloride, and carbon...
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Journal of Mineral, Metal and Material Engineering, 2017, 3 71-79 71 ...
Abstract: The influence of polymorph crystal structure on the thermal decomposition process of trigonal (calcite) and orthorhombic (aragonite) calcium carbonate was investigated by means of Thermogravimetric-Differential Thermal Analysis (TG-DTA) under non-isothermal conditions and inert atmosphere of nitrogen.
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Preparation of Needle like Aragonite Precipitated Calcium Carbonate ...
The synthesis of aragonite PCC involves two steps. At first, after calcinated dolomite fine powder was dissolved in water for hydration, the hydrated solution was mixed with aqueous solution of...
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Preparation of aragonite by carbonization in CaCl2-NH4Cl solution ...
Rod-like aragonite can be simply prepared by a carbonization method by blowing 40 % CO2 into CaCl2-NH4Cl solution with no additives. The morphology and crystal structure of the aragonite products...
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Safety assessments of subcutaneous doses of aragonite calcium carbonate ...
The aragonite polymorph of calcium carbonate is a less thermodynamically stable and a less available form of crystalline calcium carbonate polymorph synthesized in the laboratory. The size and shape of aragonite are strongly dependent on the preparation methods and conditions (Wang et al. 1999 ).
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How to make calcium carbonate - clam mineral
Calcium carbonate can produce from the marble. You can make calcium carbonate from by crossing the CO2 from the calcium hydroxide. We can make this material by the mixing of the baking soda with acid boric. These are the ways that you can make calcium carbonate. Calcium carbonate is going to turn into the lime by losing CO2.
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Adsorption of Cd(II) Ion on Aragonite Calcium Carbonate Crystals
Add accurately a certain quantity of the prepared aragonite calcium carbonate crystals powder into in a certain concentration of cadmium (II) solution containing in an Erlenmeyer flask. After shaking in 150 rpm for fixed time, the supernatant was extracted by centrifugal filtration.
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Aragonite Sentence Examples | Use Aragonite in a sentence - Dictionarybook
Aragonite whiskers were prepared by carbonate process. and the structure properties were analyzed. 25. Aragonite at 0 to 70 ℃ was synthesized by slow decomposition and two step overgrowth approaches. the phase compositions and morphology were detected by xrd and sem techniques.
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Preparation of Near Cube Form Calcite Type Calcium Carbonate Crystal ...
the results show that under the conditions of reaction temperature of 40 ℃, calcium concentration of 0.05 mol/l, carbon dioxide passing rate of 100 ml/min, stirring speed of 400 r/min and aging time of 2 h, near cube form calcium carbonate with regular morphology and uniform particle size distribution is prepared, with an average particle size .
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(PDF) Calcium Carbonate Mineralization of Microalgae
5 days agoThe two burettes contained calcium chloride and carbonate solutions at concentrations calculated so that they had the stoichiometry of Calcium: Carbonate = 1:1, as in the pre- cipitating solid.
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The preparation of CaCO3/wood composites using a chemical precipitation ...
As shown in Fig. 2b, increasing the preparation temperature caused the crystal forms of calcium carbonate to change. At 30 °C, the calcium carbonate in composites was mainly composed of the calcite crystal shape. When the temperature rose, aragonite calcium carbonate content gradually increased; higher temperatures were beneficial to the ...
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Preparation of monodispersed aragonite microspheres via a carbonation ...
When calcium carbonate is precipitated in the reaction of calcium hydroxide with gaseous carbon dioxide, calcite is usually formed at low and intermediate temperature [2,5,6,[9][10][11]28], while ...
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Synthesis and Characterization of Cockle Shell-Based Calcium Carbonate ...
Figure 2 shows an overall view of the surface functionalized cockle shell-based calcium carbonate aragonite spherical nanoparticles examined with the transmission electron microscope at low magnification. This figure provides a larger picture of the general distribution of the cockle shell-based calcium carbonate aragonite spherical nanoparticles after surface functionalization at low ...
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Synthesis, characterization, and cytocompatibility of potential cockle ...
Calcium carbonate is a porous inorganic nanomaterial with huge potential in biomedical applications and controlled drug delivery. This study aimed at evaluating the physicochemical properties and in vitro efficacy and safety of cockle shell aragonite calcium carbonate nanocrystals (ANC) as a potential therapeutic and hormonal delivery vehicle for osteoporosis management.
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Preparation of Uniform Needle-Like Aragonite Particles by ... - LMU
Many studies have shown that the properties of aragonite, such as the particle size and shape, depend strongly on the preparation methods and conditions. Direct inorganic precipi- tation using soluble carbonate and calcium salts as initial materials produced irregular aragonite crystals (5, 6).
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Calcite and Aragonite Precipitation Under Controlled Instantaneous ...
This research used ammonium carbonate and calcium acetate in the preparation of various calcium carbonate polymorphs for biomimetic composite applications. Biominerals were synthesized at. 18 PDF Role of Brucite Dissolution in Calcium Carbonate Precipitation from Artificial and Natural Seawaters D. N. Dang, S. Gascoin, +7 authors O. Gil
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Preparation of monodispersed aragonite microspheres via a ... - DeepDyve
Monodispersed calcium carbonate microspheres were prepared by carbonating a calcium acetate aqueous solution with CO2 gas at a high pressure of 40 bar and a high temperature of 80 °C after 60 minutes of reaction. The products were characterized by X‐ray powder diffraction (XRD) and scanning electron microscopy (SEM), respectively. The XRD pattern showed that the crystal polymorph of the as ...
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Frontiers | Insights from tyrosinase into the impacts of modified ...
Jul 27, 2022In a typical procedure, calcium chloride (100 mM, pH 8.5) and sodium bicarbonate (100 Mm) buffer were prepared. The protein concentration was diluted to 40 μg/mL with ultrapure water. About 10 μL of protein solution was added to 100 μL of calcium chloride buffer, and the mixed solution was transferred to 96-well plates.
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Effects of aragonite 2014, Vol 30(1) 77-90
Aragonite calcium carbonate, blown film, barrier property, mechanical property, morphology Introduction Aragonite is a carbonate mineral that is naturally precipitated calcium car-bonate (CACO 3) through an ocean cycle. Decades of studies were conducted to investigate the advantages of blending CACO 3 into the plastic film such as
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Synthesis of Aragonite-Type Calcium Carbonate by Overgrowth ... - DeepDyve
The pre- the preparation of calcium carbonate has been cipitate was ®ltered, rinsed with distilled water described many times in the chemical and geological several times, and dried in an oven at 110 8C for literature, the synthesized products have not been 12 h. ... This implies that aragonite could be more crystal structure and their unit ...
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Synthesis of needle-like aragonite from limestone in the presence of ...
Abstract Needle-like aragonite was synthesized with a reversible solution reaction from limestone without calcinations. Scan Electron Microscope (SEM) and X-ray Diffraction (XRD) were used to characterize the morphology and the crystal structure of aragonite. The synthesis of aragonite whisker involves two steps. At first GCC (Ground Calcium Carbonate) was dissolved in an aqueous solution of ...
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A Study on the Preparation of Precipitated Calcium Carbonate from ...
crystalline limestone. Hard calcium carbonate and ground calcium carbonate are not uniform in particle shape or size, but PCC is produced by a chemical reaction, so the particle shape and size are very regular. In the past, heavy calcium carbonate was mostly used in industrial sites, but in recent years, PCC is gradually replacing the demand [4].
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Preparation and characterization of sodium alginate/phosphate ...
Jun 25, 2021Firstly, 10 ml of Alginate/ACCP-Cur suspension (1 mg ml −1) was put into a dialysis bag (34 kDa). Then, this dialysis bag was immersed in 100 ml PBS buffers and placed in a shaking bath (37 °C,70 rpm). At predetermined intervals, remove 3 ml PBS buffers from the medium and replace them with an equal amount of fresh PBS.
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Method and apparatus for production of precipitated calcium carbonate ...
The process as set forth in claim 26, wherein said temperature of said aqueous lime slurry is controlled to 120° F. to produce aragonite precipitated calcium carbonate. 31.
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Polymorphic Phase Change of Calcium Carbonate with Glutamic ... - TRDizin
The calcium carbonate (CaCO3) crystals were successfully synthesized in the presence ofglutamic acid used as an additive at 30 °C and at a pH of 8.5. The synthesized product was characterized indetail by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and scanning electronmicroscopy (SEM) to identify the structure and habit of the crystals.
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Amazingly Versatile Uses of Calcium Carbonate - Science Struck
Other Uses. The paste of calcium carbonate and deionized water is used to clean the tarnish on silver. It is a food additive (designated E170) and bears the INS number 170. It is also used as a food preservative. Calcium carbonate is also utilized as a color retainer for organic apples and other foods.
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Applied Sciences | Free Full-Text | The Processing of Calcium Rich ...
Every year a million tonnes of calcium rich agro and industrial waste are generated around the whole globe. These calcium rich waste like finger citron, shells of cockle, mussel, oysters etc., and egg shell are biological sources which have various organic compounds. The inorganic calcium rich waste includes gypsum, dolomite, sludge etc., which are produced in surplus amount globally. Most of ...
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Prismin: A New Matrix Protein Family in the Japanese Pearl Oyster ...
In-vitro crystal growth of CaCO 3 in a mother solution, and morphological observations with scanning electron microscopy (SEM) Preparation of a mother solution (MS; supersaturated solution of Ca [HCO 3] 2) and in-vitro crystallization were performed as described previously, but without 50 mM MgCl 2 ( Matsushiro et al., 2003 ).
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Frontiers | Calcium Carbonate Precipitation for CO2 Storage and ...
The complete transformation of metastable vaterite into calcite was achieved after about 200 min at 25°C, and aragonite was completely transformed into calcite after about 1,000-1,300 min at 60-80°C.
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Facile preparation of calcium carbonate particles with unusual ...
Aqueous solutions of Na 2 CO 3 (0.5 M) and of CaCl 2 (0.5 M) were first prepared as stock solutions. In a typical synthesis, a solution of Na 2 CO 3 (0.5 M, 1.28 ml) was injected into the aqueous solution of organic additive (80 ml, 1.0 g l −1) and the pH of the solution was adjusted to a desired pH (pH=10) by using HCl or NaOH.
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Development of nanoantibiotic delivery system using cockle shell ...
The ANPs were synthesized by adding 3 mL of SB-12 into the mixture and vigorously stirred at 1,000 rpm at 80°C for 90 minutes using a systematic multi-hotplate stirrer (Witeg, WiseStir SMHS) and a magnetic stirrer bar.
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Synthesis and Characterisation of CaCO3 (Calcite) Nano Particles from ...
It was one type of crystal form of calcium carbonate other than aragonite and vaterite. The strong and sharp peaks showed that the cockle shell CaCO 3 powder was well crystalline. The average crystallite size (D) of the calcium carbonate was calculated using Debye-Scherrer equation [19, 20].
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A Novel Method for Preparing Calcium Carbonate Particles: Thermal ...
Abstract: An entirely novel preparation method of calcium carbonate (CaCO 3) from calcium hydrogen carbonate (Ca (HCO 3) 2) solution was presented and named as thermal decomposition. The variation of the polymorphs and morphologies of CaCO 3 particles with reaction temperature was investigated.
WhatsApp:+8617329420102Influence of pH on morphology, size and polymorph of room temperature ...
DOI: 10.1016/J.POWTEC.2018.08.066 Corpus ID: 105392993; Influence of pH on morphology, size and polymorph of room temperature synthesized calcium carbonate particles @article{Oral2018InfluenceOP, title={Influence of pH on morphology, size and polymorph of room temperature synthesized calcium carbonate particles}, author={Çağatay M. Oral and Batur Ercan}, journal={Powder Technology}, year ...
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Solid‐State Transformation of Amorphous Calcium Carbonate to Aragonite ...
Calcium carbonate is a frequently used model mineral in studies of crystallization mechanisms, 1 due to its availability in nature, wide-spread application as a construction material for hard tissues, and pivotal role in the global carbon cycle. Calcite, which is the thermodynamically stable polymorph of calcium carbonate, is the usual product of CaCO 3 crystallization performed at low ...
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What are some examples of minerals that contain calcium and carbonate ...
Answer: Question Originally Answered: "What are some examples of minerals that contain calcium and carbonate?" Examples of minerals which contain just the compound calcium carbonate are;- Calcite: CaCO_3 Aragonite: CaCO_3 Vaterite: CaCO_3 Examples of minerals which contain calcium and...
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Solid‐State Transformation of Amorphous Calcium Carbonate to Aragonite ...
To form aragonite, CaCl 2 ⋅2 H 2 O was added to Na 2 CO 3 to form a final reaction concentration of 0.025 m with ethanol as 50 vol % of the solvent, at a gentle shaking speed. 10 To prepare samples for cryoTEM, 3 μL of reaction solution was immediately vitrified at the required timepoint.
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Comparison of Nano-Pearl Powder Milled with ... - Baitian New Materials
Jan 20, 2022Start klln-1 sand grinding disperser, dispersant and repeatedly clean and grind the system, combine mica pearl powder with water without water ethanol (or distilled water) in the ratio of 1 g/15 ml to two HRS in sand mill, dry and set. The grinding tube contains 1.85 kg diameter 0.1 mm zirconium oxide ball. Process parameters:
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Control of Crystal Size and Morphology of Calcium Carbonate Crystal ...
GCC is produced by the crushing and classifying process and has irregular particle size and shape, while PCC is mainly produced by the lime milk coal oxidation method, in which calcium carbonate is precipitated by blowing CO 2 into calcium hydroxide slurry.
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