
Needleshaped test of calcium carbonate in highway engineering
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Impact of NanocarbonCoated Calcium Carbonate on
2024年10月14日 The preliminary results indicate a variance in rutting performance between samples containing ordinary calcium carbonate and those containing modified calcium carbonate The wheeltracking test serves as a reliable and effective method for evaluating the rutting 2023年6月27日 In this study, anhydrous calcium sulfate whiskers (ACSW) were surfacetreated with sodium carbonate and stearic acid to prepare inorganic–organic surfacecotreated Preparation, characterization, and properties of asphalt 2022年1月1日 Calcium carbonate shows a good in vitro bioactivity which has been attributed to different factors, especially to the ability of aragonite to modulate environmental calcium ion Factors controlling and influencing polymorphism, morphology and size 2010年7月10日 Novel selfassembled calcium carbonate (CaCO 3) crystals exhibiting the morphology of welldefined needles were synthesized by a simple precipitation reaction in the Synthesis of selfassembled needleshaped calcium carbonate
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The Distribution Pattern of Calcium Carbonate
2024年5月22日 In order to study the blockages of tunnel drainage pipes, the flow rate of a calcium carbonate crystal tunnel was measured in the mountainous area of Southwest China According to the actual flow velocity results, 2004年4月30日 Needlelike CaCO 3 particles consisting mainly of aragonite phase with a little calcite content were synthesized by carbonation in highgravity environment generated by a Controlling factors and mechanism of preparingNeedleshaped aragonite, a thermodynamically metastable polymorph of CaCO3, was synthesized in a deinked old newspaper pulp (ONP) slurry, otherwise known as the insitu Improving Recycled Fiber by Applying InSitu Aragonite 2017年7月24日 Calcium carbonate (CaCO3) occurs in two major polymorphs: rhombohedral calcite and orthorhombic aragonite, the latter is thermodynamically metastable In this study, we first prepared aragonite needlelike particles by Fabrication of SingleCrystalline Calcite Needle
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Effect of modified heavy calcium carbonate on properties of
2022年11月17日 Their physical properties, viscoelastic properties and chemical composition were investigated through conventional physical tests, DSR, FTIR and fluorescence 2020年8月11日 Increasing the temperature of Na 2 CO 3 and (NH 4) 2 CO 3 solutions (70–100 °C) led to formation of the biphasic aragonite–calcite druses of needle crystals (druses size ≈ Influence of synthesis conditions on the calcium carbonate 2016年1月31日 “Process of Producing NeedleShaped Calcium Carbonate Particles,” US Patent 4, 824, 654 (April 25, 1989) ions was measured at 166 mg L−1 via the alkalinity test At optimum operating Preparation of Needle like Aragonite 2023年6月27日 As the solubility product of calcium sulfate is 73 × 105, and the solubility product of calcium carbonate is 49 × 109, sodium carbonate solution is adopted as an inorganic surfactant The sulfate radical (SO 4 2) on the surface of ACSW was easily replaced by carbonate to form calcium carbonate (CaCO 3)Preparation, characterization, and properties of asphalt

Efficiency and Morphology of Calcium Carbonate Precipitate
2023年9月1日 Economic and efficient application of enzyme induced calcium carbonate precipitation (EICP) requires optimisation of the process and understanding of the precipitate microstructure The objective of this study was to compare the precipitate efficiency and the interface shearing resistance of the precipitate, using Taguchi method The factors which A process of producing needleshaped calcium carbonate particles consisting of the steps of adding, aqueous calcium hydroxide solution of a concentration of 004017 % by weight to an aqueous medium bath with a temperature of not less than 60° C and to which carbon dioxide gas or a carbon dioxidecontaining gas is being blown to generate USA Process of producing needleshaped calcium carbonate A survey of 18 species of the Ceramiales grown in culture revealed calcium oxalate crystals in Antithamnion antillanum Børgesen, A callocladum Itono, and A sparsum TokidaNeedleshaped calcium oxalate crystals in the axial cells of 2022年1月1日 The mechanism of precipitation of CaCO 3 has been widely studied, and it is divided into three main stages: i) predominant presence of Amorphous Calcium Carbonate (ACC) nucleated at the beginning of the process; ii) dissolution of unstable ACC and recrystallization into vaterite and calcite iii) dissolution of the metastable vaterite and recrystallization into the most Factors controlling and influencing polymorphism, morphology and size

Calcium carbonate precipitation by strain Bacillus
2023年12月14日 Research Paper Calcium carbonate precipitation by strain Bacillus licheniformis AK01, newly isolated from loamy soil: a promising alternative for sealing cementbased materialsCalcium Carbonate Formation Process Joobeom Seo 1, Jong Gyu Lee , Needleshaped aragonite, a thermodynamically metastable polymorph of CaCO 3, was synthesized in a deinked old newspaper pulp (ONP) slurry, otherwise known as the insitu aragonite formation process, in order to improve the optical properties such as the brightness and ERICImproving Recycled Fiber by Applying InSitu Aragonite 2017年8月1日 This article provides an exclusive overview of the synthesized aragonite precipitated calcium carbonate and its applications in various fields The last decade has seen a steady increase in the number of publications describing the synthesis, characterization andA Brief review of Aragonite Precipitated Calcium Carbonate 2003年8月1日 This paper examines the effect of salinity on kinetics and thermodynamics of precipitaion for CaCO 3 and CaSO 4 when they exist in isolation as well as together Batch tests under isothermal (30°C) conditions were carved out for salinity values ranging between 05 to 15 M of NaCl, calcium sulfate in the range of 006–015 M, calcium carbonate in the range of Kinetics and thermodynamics of calcium carbonate and calcium
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Methods for Calcium Carbonate Content
2017年11月1日 Tests were also performed at calcium chloride (CaCl2) concentrations of 01 and 03 M, resulting in specimens with average calcium carbonate (CaCO3) content ranging from 15 to 25% for the 50/70 2009年2月1日 The potential of surfacefunctionalized calcium carbonate aragonite polymorph nanoparticle as a drugdelivery agent were assessed through in vitro drugloading test and drugrelease testSynthesis of needlelike aragonite from limestone in the DOI: 101016/JJSSC200505025 Corpus ID: ; Needlelike calcium carbonate assisted selfassembly of mesostructured hollow silica nanotubes @article{Wang2005NeedlelikeCC, title={Needlelike calcium carbonate assisted selfassembly of mesostructured hollow silica nanotubes}, author={Jiexin Wang and Lixiong Wen and Runjing Liu and Jianfeng Chen}, Needlelike calcium carbonate assisted selfassembly of 2018年12月19日 The crystal from old tunnels of Korea was calcium carbonate which was confirmed by microtesting [6, 8]It was confirmed that the precipitation of calcium carbonate was influenced by calcium ion, bicarbonate ion, pH, flow rate, temperature, and saturation index [9, 10]Furthermore, different temperatures may cause different crystal morphologies of calcium Experimental Study on Prevention of Calcium Carbonate

Synthesis of precipitated calcium carbonate: a review
2017年3月9日 The current high global demand for highquality paper, paint, adhesive/sealant, and plastic, filler industries cannot survive without unique and highquality precipitated calcium carbonate (PCC) They are used as fillers, additives, and reinforcements PCC is a key constituent of the modern paper and plastic industry This article reports the effect of various 2021年7月8日 Meals: Different types of calcium vary in whether they're absorbed best with or without foodCalcium carbonate should be taken with meals Calcium citrate should be taken on an empty stomach Medications: Calcium should not be taken with certain medications, including antibiotics, iron supplements, high blood pressure medications, and othersCalcium can bind Calcium Carbonate vs Calcium Citrate Verywell Health2021年12月1日 When RCA surfaces were subjected to chemical and microbialinduced carbonation, the surface of CRCA became less porous (Fig 5b) and was covered with visuallyinspected granulartextured and needleshaped calcium carbonate crystals, similar to observations made in the work of Bertos et al [65]The effect of chemical versus microbialinduced calcium carbonate 2020年8月11日 Calcium carbonate (CaCO 3) in the form of chalk powder is widely used as filler in the production of building materials, plastics, rubber, paper, etc (Thenepalli et al 2010; Vogel et al 2013; Tangboriboon et al 2015; Hubbe and Gill 2016; Penkin et al 2016; Lourenço et al 2016; Lourenço et al 2015b) At the same time, increasing requirements for chemical Influence of synthesis conditions on the calcium carbonate
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(PDF) EnzymeInduced Carbonate Precipitation: ScaleUp
2019年12月3日 PDF A 03 mdiameter × 09 mlong biocemented soil column was created in a 06 m × 06 m ×12 m box filled with dry quarry sand using enzyme induced Find, read and cite all the research 2024年5月22日 Severe blockages of tunnel drainage systems greatly affect the lining structure of the tunnels, thus jeopardizing their stability and safety In order to study the blockages of tunnel drainage pipes, the flow rate of a calcium carbonate crystal tunnel was measured in the mountainous area of Southwest China According to the actual flow velocity results, numerical The Distribution Pattern of Calcium Carbonate Crystallization 2017年8月1日 The change in pH of the slurry during the carbonation of Ca(OH)2 at 70 °C with the approximate flow rate of 900 mL/min of CO2 (30%)clean air (70%) mixed gas for 100 g of Ca(OH)2, as the function Fabrication of SingleCrystalline Calcite NeedleLike Particles 2021年6月1日 Calcium carbonate, CaCO 3, is the most frequent precipitate of water scale detectable in three different polymorphs as calcite, aragonite and vateriteCalcite, which is the more thermodynamically stable polymorphic form, is characterized by rhombohedra crystals having large connecting area responsible of the formation of more compact linings on surfacesEffect of magnetic field on calcium carbonate precipitated in natural
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Kinetics of Nucleation and Growth of Calcium Carbonate and Calcium
2020年9月29日 To crystallize calcium carbonate and calcium sulfate, the nuclei with the corresponding compositions were used as a seed material, which were specially prepared using the method of reagent precipitation For the experiments, we used a laboratory glass crystallization reactor with a capacity of up to 08 L equipped with a thermostating jacketXRD patterns of three calcium carbonate polymorphs: (a) aragonite; (b) vaterite; (c) calcite Fig 2 shows the FTIR spectra of the three synthesized CaCO 3 polymorphs The characteristic carbonate v 2 band of aragonite is at 858 cm −1; whereas, that of both calcite and vaterite is at 874 cm −1The characteristic carbonate v 4 band of aragonite is at 700 and 713 cm −1; Differentiation of Calcium Carbonate Polymorphs by Surface 2019年12月20日 In addition to the four soils, three additional artificial mixes were studied to study the effect of clay content on MICP effectiveness Both macroscale and microscale studies were conducted on untreated and biostimulated soils to observe strength gain, swelling reduction, and calcium carbonate precipitationEvaluating the Applicability of Biostimulated Calcium Carbonate 2020年12月30日 The contact angle of the cubic calcium carbonate, spherical calcium carbonate and CaCO3@SiO2 composite material were measured They were 516°, 735°, and 768°, respectivelyStudy on preparation and structure of chrysanthemumshaped
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Effect of calcium carbonate particle shape on phagocytosis
2017年8月19日 Calcium carbonate (CaCO 3) is one of the most abundant inorganic materials and has three anhydrous polymorphs: calcite, vaterite, and aragoniteAmong these three polymorphs, aragonite is used to produce advanced drug delivery systems [16] and scaffolds for bone repair and tissue engineering [17] because of its biocompatibility2022年9月27日 The energy band gap of CaCO3 sample from chicken eggshell synthesis Figure 3 shows the absorption rate of CaCO 3 from the synthesis of chicken egg shells in the range of 2371 nm, 2515 nm, and (PDF) SYNTHESIS OF CALCIUM CARBONATE (CaCO3) FROM 2023年9月27日 Nanomicro calcium carbonate has a small particle size, uniform distribution, and good dispersion performance, offering great research value and development prospects It has been widely used as a filler material for rubber, paper, ink, pigments, and coatings Developing an efficient and controllable approach to preparing nanomicro calcium carbonate Controllable Synthesis of NanoMicro Calcium Carbonate Among the crystal forms of calcium carbonate, aragonite has needlelike shape Although materials with needleshaped crystals are associated with pulmonary toxicity, the toxic activity of aragonite is unclear Therefore, proinflammatory potential of aragonite, neutralized aragonite and potassium tit Comparison of proinflammatory potential of needleshaped

Preparation of Needle like Aragonite
2016年1月31日 “Process of Producing NeedleShaped Calcium Carbonate Particles,” US Patent 4, 824, 654 (April 25, 1989) ions was measured at 166 mg L−1 via the alkalinity test At optimum operating 2023年6月27日 As the solubility product of calcium sulfate is 73 × 105, and the solubility product of calcium carbonate is 49 × 109, sodium carbonate solution is adopted as an inorganic surfactant The sulfate radical (SO 4 2) on the surface of ACSW was easily replaced by carbonate to form calcium carbonate (CaCO 3)Preparation, characterization, and properties of asphalt 2023年9月1日 Economic and efficient application of enzyme induced calcium carbonate precipitation (EICP) requires optimisation of the process and understanding of the precipitate microstructure The objective of this study was to compare the precipitate efficiency and the interface shearing resistance of the precipitate, using Taguchi method The factors which Efficiency and Morphology of Calcium Carbonate Precipitate A process of producing needleshaped calcium carbonate particles consisting of the steps of adding, aqueous calcium hydroxide solution of a concentration of 004017 % by weight to an aqueous medium bath with a temperature of not less than 60° C and to which carbon dioxide gas or a carbon dioxidecontaining gas is being blown to generate USA Process of producing needleshaped calcium carbonate
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Needleshaped calcium oxalate crystals in the axial cells of
A survey of 18 species of the Ceramiales grown in culture revealed calcium oxalate crystals in Antithamnion antillanum Børgesen, A callocladum Itono, and A sparsum Tokida2022年1月1日 The mechanism of precipitation of CaCO 3 has been widely studied, and it is divided into three main stages: i) predominant presence of Amorphous Calcium Carbonate (ACC) nucleated at the beginning of the process; ii) dissolution of unstable ACC and recrystallization into vaterite and calcite iii) dissolution of the metastable vaterite and recrystallization into the most Factors controlling and influencing polymorphism, morphology and size 2023年12月14日 Research Paper Calcium carbonate precipitation by strain Bacillus licheniformis AK01, newly isolated from loamy soil: a promising alternative for sealing cementbased materialsCalcium carbonate precipitation by strain Bacillus Calcium Carbonate Formation Process Joobeom Seo 1, Jong Gyu Lee , Needleshaped aragonite, a thermodynamically metastable polymorph of CaCO 3, was synthesized in a deinked old newspaper pulp (ONP) slurry, otherwise known as the insitu aragonite formation process, in order to improve the optical properties such as the brightness and ERICImproving Recycled Fiber by Applying InSitu Aragonite
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A Brief review of Aragonite Precipitated Calcium Carbonate
2017年8月1日 This article provides an exclusive overview of the synthesized aragonite precipitated calcium carbonate and its applications in various fields The last decade has seen a steady increase in the number of publications describing the synthesis, characterization and2003年8月1日 This paper examines the effect of salinity on kinetics and thermodynamics of precipitaion for CaCO 3 and CaSO 4 when they exist in isolation as well as together Batch tests under isothermal (30°C) conditions were carved out for salinity values ranging between 05 to 15 M of NaCl, calcium sulfate in the range of 006–015 M, calcium carbonate in the range of Kinetics and thermodynamics of calcium carbonate and calcium