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Calcium Carbonate - Formula, Structure, Properties and Uses - VEDANTU
Calcium Carbonate is a chemical compound having the chemical formula CaCO3. It is a white and insoluble powder-like substance that occurs naturally in minerals, marble, chalk, limestone, shells, calcite, pearl, and other related compounds. Medicinally, we use it as an antacid or a calcium supplement. It can also be used as cosmetics fillers.
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An electron microscope study of crystal calcium carbonate formation in ...
The ultrathin sections of the developing otolith of mouse fetuses 15.5 days to 20 days after birth were observed with the aid of the electron microscope. The first step of otolith formation is an aggregation of organic clusters observed in the sacculus of the 15.5-day fetus. These organic structures are modified and assume a hexagonal shape in ...
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[PDF] Growth Rate and Morphology of a Single Calcium Carbonate Crystal ...
Calcite growth experiments using atomic force microscopy (AFM) were conducted at two constant values of supersaturation (Ω1 = 5.248 and Ω2 = 6.457) while varying the Ca2+ to CO32− concentration. 53 View 2 excerpts, references results and background Kinetics of spiral growth of calcite crystals and determination of the absolute rate constant
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Inorganic overgrowth of aragonite on molluscan nacre examined by atomic ...
Introduction The mineral shells of a variety of molluscs are composite biomaterials consisting of crystals of calcium carbonate (CaC[O.sub.3]) intercalated with organic materials, primarily proteins and glycoproteins (reviewed in Wilbur, 1972; Towe, 1972; Watabe, 1981; Weiner, 1986; Simkiss and Wilbur, 1989; Lowenstam and Weiner, 1989).
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Polymer Science Using Atomic Force Microscopy
Atomic force microscopy (AFM) is an excellent method for characterizing the topography of polymer films and artifacts, as well as many other features. In this aspect, AFM offers significant benefits over electron microscopy. For example, because most polymers are insulators, they would need to be coated for SEM examination, perhaps affecting their texture. AFM, unlike TEM, does not require a ...
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Interaction of spherical polyelectrolyte brushes with calcium carbonate ...
Abstract We present a comprehensive study of the interaction of spherical polyelectrolyte brushes (SPBs) with cationically modified polyacrylamide (CPAM), calcium carbonate (CaCO3) particles, ... Field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM) are used to analyze the system, the structure of the ...
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Atomic force microscopy and molecular modeling of ... - SpringerLink
Oyster shell protein and polyaspartate bound to calcite have been visualized at the atomic and molecular levels by atomic force microscopy. The identities of potential binding sites have been suggested from atomic force microscopy (AFM) images and have been evaluated by molecular modeling.
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Studies on the characterisation of Biosealant properties of Bacillus ...
was highest at pH 8. The broth culture was subjected to Atomic Force Microscope studies. The analysis confirmed the presence of calcite in both the bacterial solution and dry scrapes. Optimum nickel ion concentration for calcium carbonate precipitation was found to be 80μm. The cubes were treated for 5 days in
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Scanning-Induced Growth on Single Crystal Calcite with an Atomic Force ...
Atomic Force Microscopy and X-ray Photoelectron Spectroscopy Study of NO2 Reactions on CaCO3 (101̅4) Surfaces in Humid Environments. ... AFM Investigation for the Initial Growth Processes of Calcium Carbonate on Hydrophilic and Hydrophobic Substrate. Crystal Growth & Design 2009, 9 (7), 3245-3250. DOI: 10.1021/cg801334g. David P. Burt, Neil R ...
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A quantitative lateral force Microscopy study of the dolomite (104 ...
The U.S. Department of Energy's Office of Scientific and Technical Information
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[PDF] pH-dependence of calcite growth kinetics at constant solution ...
Calcite-solution reactions (growth, dissolution and replacement) are critical in a range of both engineering and natural processes. Classical crystal growth theory relates calcite growth rates to the degree of supersaturation. The solution composition may also affect the growth rate of carbonate minerals, via the Ca to CO2− 3 concentration ratio (Nehrke et al., 2007; Perdikouri et al., 2009 ...
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Factors affecting morphology of microbially induced calcium carbonate
calcium carbonate was studied using field emission scanning electron microscopy and atomic force microscopy. The factors affecting the characteristics of calcium carbonate were revealed. And based on the results, the methods of getting higher adhesive capacity by controlling the morphology of calcium carbonate were obtained.
WhatsApp:+8617329420102Microbial-induced calcium carbonate precipitation: An experimental ...
(a) A broad peak can be identified at 1080 cm-1, which corresponds to amorphous calcium carbonate. With increasing time the amorphous calcium carbonate transforms into a vaterite phase (b) (double peak at 1074 cm-1 and 1085 cm-1). After 15 min a characteristic calcite peak can be identified at 1085 cm-1.
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An atomic force microscopy study of the interaction between magnetite ...
An atomic force microscopy study of the interaction between magnetite particles : the effect of Ca2 + ions and pH Force interactions between a microsize (m-s) magnetite probe and thin layers of synthesized magnetite particles as well as microsize (m-s) magnetite particles from magnetite concentrate were invest ... diva-portal
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Guntram Jordan - Google Scholar
Visualization of calcium carbonate dissolution in aqueous solution. M Etienne, A Schulte, S Mann, G Jordan, ID Dietzel, W Schuhmann. Analytical chemistry 76 (13), 3682-3688, 2004. 73: ... Dissolution kinetics of magnesite in acidic aqueous solution: A hydrothermal atomic force microscopy study assessing step kinetics and dissolution flux.
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Comparison of atomic force microscopy and zeta potential derived ...
Atomic force microscopy The AFM measurements were made using an Asylum Research MFP-3D. The mica samples were prepared by gluing a freshly cleaved mica substrate to a glass slide with EPON Resin 1002F epoxy adhesive and rinsing the substrate with ultradeionized water (MilliQ, 18.2 M Ωcm).
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Combined SEM (secondary electrons, backscatter ... - DeepDyve
A variety of microscope techniques have been used to study surficial phenomena on the fracture surfaces of the Martian meteorite ALH84001. The aim of the investigation was to determine the most useful microscopy methods in the search for morphological signs of biogenic activity. Emphasis was placed on scanning electron microscopy (SEM) using secondary, backscatter and cathodoluminescence modes ...
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Study shows how calcium carbonate forms composites to make strong ...
To find out how calcium carbonate incorporates proteins or other strength-building components, the team turned to atomic force microscopy, also known as AFM, at the Molecular Foundry, a DOE Office ...
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Imaging powders with the atomic force microscope: from ... - PubMed
Atomically resolved images of pressed powder samples have been obtained with the atomic force microscope (AFM). The technique was successful in resolving the particle, domain, and atomic structure of pismo clam (Tivela stultorum) and sea urchin (Strongylocentrotus purpuratus) shells and of commercially available calcium carbonate (CaCO(3)) and strontium carbonate (SrCO(3)) powders.
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Atomic-Resolution Imaging of Aragonite (001) Surface in Water by ...
In this study, we performed observation of the (001) face of a natural aragonite crystal surface at the atomic scale by the newly developed frequency modulation atomic force microscopy (FM-AFM). On the (001) face of aragonite, several growth islands with flat terraces were observed.
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Interactions between Organophosphonate-Bearing Solutions and (101̅4 ...
The results suggest that the presence of HEDP can increase the frequency of water exchange in the hydration shell of calcium and consequently affect its reactivity in solution. For [HEDP] > 5 mM, we observed the nucleation and growth of Ca (CH 3 C (OH) (PO 3 H) 2 ·2H 2 O on calcite surfaces.
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Dissolution kinetics of magnesite in acidic aqueous solution, a ...
atomic force microscope (HAFM; Higgins et al., 1998). The HAFM enables investigation of the solid-liquid interface at temperatures well above the ambient boiling point of water by applying pressure to the fluid. The magnesite crystals used originated in Brumado, Brasilia. The crystals were cleaved immediately before the experiments with a blade.
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Crystal Growth and Dissolution of Calcite in the Presence of Fluoride ...
Calcite, Dissolution Abstract Growth and dissolution of calcite {101̅4} surfaces in aqueous solutions in the presence of fluoride ions have been studied by in situ atomic force microscopy (AFM). Supersaturated and undersaturated solutions with respect to calcite were prepared for the growth and dissolution experiments, respectively.
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An atomic force microscopy study of the dissolution of calcite in the ...
importantly this study gives insights into the mechanism of interface-coupled dissolution-precipitation reactions occurring during the interaction of phosphate-bearing solutions with calcium carbonate minerals and emphasizes the importance of performing direct observations when determining the kinetics of dissolution reactions, as they can be .
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An Atomic Force Microscopy Study of the Growth of a Calcite Surface as ...
Calcite growth experiments using atomic force microscopy (AFM) were conducted at two constant values of supersaturation (Ω 1 = 5.248 and Ω 2 = 6.457) while varying the Ca 2+ to CO 32− concentration ratio. The calcite growth rate and the morphology of growth depend on the solution stoichiometry.
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An Atomic Force Microscopy Study on the Effect of β-Galactosidase, α-L ...
An Atomic Force Microscopy Study on the Effect of β-Galactosidase, α-L-Rhamnosidase and α-L-Arabinofuranosidase on the Structure of Pectin Extracted from Apple Fruit Using Sodium Carbonate. Piotr Mariusz Pieczywek Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-270 Lublin, Poland. Author profile
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Calcite growth rates as a function of aqueous calcium-to-carbonate ...
The U.S. Department of Energy's Office of Scientific and Technical Information
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Hydrothermal atomic force microscopy observations of barite step growth ...
The U.S. Department of Energy's Office of Scientific and Technical Information
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Dissolution Kinetics of Calcite in 0.1 M NaCl Solution at Room ...
Abstract. Atomic force microscopy (AFM) was used to study the rates of migration of the (10 14)N plane of a single-crystal of calcite dissolving in 0.1 M NaCl aqueous solutions at room temperature. The solution pH and PCO 2 controlled in the ranges 4.4
CiteSeerX — Studies on the characterisation of Biosealant properties of ...
The broth culture was subjected to Atomic Force Microscope studies. The analysis confirmed the presence of calcite in both the bacterial solution and dry scrapes. Optimum nickel ion concentration for calcium carbonate precipitation was found to be 80μm.
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Biomineralization of calcium phosphate revealed by in situ ... - Nature
Based on Cryo-TEM 8 and atomic force microscopy ... This approach has been used to study the nucleation and growth of ... In situ electron microscopy studies of calcium carbonate precipitation ...
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In-situ 2D bacterial crystal growth as a function of protein ...
Precipitation of calcium carbonate in confinement. Advanced Functional Materials, 14 (12), ... Chemical and thermal denaturation of crystalline bacterial S‐layer proteins: an atomic force microscopy study. Microscopy Research and Technique, 65 (4‐5), 226-234. 10.1002/jemt.20127 ...
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In Situ Characterisation of Calcite Growth and Inhibition Using Atomic ...
Real time in situ monitoring of calcite growth and inhibition on the cleavage plane is investigated using atomic force microscopy (AFM). The organic additives bind to the crystal surface, with selective binding to the step edges particularly evident in some cases. In other cases, it appears that the additive acts by binding to the terraces on the crystal surface, resulting in inhibition by ...
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Imaging Powders with the Atomic Force Microscope: From ... - Science
Atomically resolved images of pressed powder samples have been obtained with the atomic force microscope (AFM). The technique was successful in resolving the particle, domain, and atomic structure of pismo clam (Tivela stultorum) and sea urchin (Strongylocentrotus purpuratus) shells and of commercially available calcium carbonate (CaCO 3) and strontium carbonate (SrCO 3) powders.
WhatsApp:+8617329420102
True Atomic Resolution by Atomic Force Microscopy Through Repulsive and ...
The (1014) cleavage plane of calcite has been investigated by atomic force microscopy in water at room temperature and true lateral atomic-scale resolution was achieved, achieving the highest, most reliable resolution on a flat, well-ordered surface. The (1014) cleavage plane of calcite has been investigated by atomic force microscopy in water at room temperature.
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PNNL: News - How seashells get their strength
Study shows how calcium carbonate forms composites to make strong materials such as in shells and pearls News Release January 08, 2016 PNNL News ... To find out how calcium carbonate incorporates proteins or other strength-building components, the team turned to atomic force microscopy, also known as AFM, at the Molecular Foundry, a DOE Office ...
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Self-assembly of amorphous calcium carbonate microlens arrays
The CaCO 3 microlenses show structural complexity as found by depth scans with confocal Raman spectroscopic imaging ( Fig. 4 ), revealing the distribution of carbonate, water and organic...
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Calcite Growth Rates As a Function of Aqueous Calcium-to-Carbonate ...
Calcium, Strontium, Ions Abstract Using in situ atomic force microscopy, the growth rates of the obtuse and acute step orientations on the {101̅4} calcite surface were measured at two saturation indices as a function of the aqueous calcium-to-carbonate ratio and aqueous strontium concentration.
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Pore‐scale simulation of mixing‐induced calcium carbonate precipitation ...
[7] The objectives of this study are to present a new pore scale-reactive transport model for calcium carbonate precipitation and dissolution, to evaluate it with published experimental results from a microfluidic pore network experiment, and to identify mechanisms that are poorly captured with existing theory.
WhatsApp:+8617329420102Comparative Study of Nanoscale Surface Structures of Calcite ...
With the advent of scanning probe microscopies, especially atomic force microscopy (AFM) for the study of nonconductive materials, great strides have been made in the elucidation of crystal growth processes and mechanisms. ... Reversed calcium carbonate morphologies induced by controlling microscopic growth kinetics: Insight into biomineralization.
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