Science topic

Carbonates - Science topic

In chemistry, a carbonate is a salt of carbonic acid, characterized by the presence of the carbonate ion, CO2− 3. The name may also means an ester of carbonic acid, an organic compound containing the carbonate group C(=O)(O–)2.
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Publications related to Carbonates (10,000)
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Ocean acidification (OA) has been identified as one of the major climate-change related threats, mainly due to its significant impacts on marine calcifiers. Among those are the calcareous green algae of the genus Halimeda that are known to be major carbonate producers in shallow tropical and subtropical seas. Hence, any negative OA impacts on these...
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The conversion of poly (hexamethylene adipamide) or polyamide 66 precursor fiber to carbon fibers was accomplished through thermal stabilization and carbonization processes. Thermal stabilization was conducted of cupric chloride (CuCl 2 )–ethanol-impregnated polyamide 66 (PA66) fibers in the air. To determine the influence of heating rate on the fi...
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In conventional ethylene carbonate (EC)/propylene carbonate (PC) electrolyte, sodium metal reacts spontaneously and deleteriously with solvent molecules. This significantly limits the practical feasibility of high-voltage sodium metal batteries based on Na metal chemistry. Herein, we present a sodium metal alloy strategy via introducing NaIn and Na...
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The energy density of commercial lithium (Li) ion batteries with graphite anode is reaching the limit. It is believed that directly utilizing Li metal as anode without a host could enhance the battery’s energy density to the maximum extent. However, the poor reversibility and infinite volume change of Li metal hinder the realistic implementation of...
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Background Computed tomography (CT) imaging has been widely used for the diagnosis and surveillance of diseases. Although CT is attracting attention due to its reasonable price, short scan time, and excellent diagnostic ability, there are severe drawbacks of conventional CT contrast agents, such as low sensitivity, serious toxicity, and complicated...
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Disaster-hit and/or un-electrified remote areas usually have electricity accessibility issues and an abundance of plant-derived debris and wood from destroyed wooden structures; this can be potentially addressed by employing a decentralized ultra-small biomass-fed gasification power generating system. This paper presents an assessment of the techni...
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The Molasse Basin is one of the most promising areas for deep geothermal exploitation in Germany and the target horizon is the aquifer in the Upper Jurassic carbonates. Carbonate deposits can be very heterogeneous even over a small area due to diagenetic processes and varying depositional environments. The preferential targets for geothermal exploi...
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Particle-size analysis on ancient mortars and concretes aggregate is today a common practice in Cultural Heritage and civil engineering. Normally, a particle-size distribution of mortar aggregates on in situ materials is carried out using sieves, following the dissolution of the carbonate binder. This technique needs about 200 g of material per sam...
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Highlights A novel amide-based nonflammable electrolyte is proposed. The formation mechanism and solvation chemistry are investigated by molecular dynamics simulations and density functional theory. An inorganic/organic-rich solid electrolyte interphase with an abundance of LiF, Li 3 N and Li–N–C is in situ formed, leading to spherical lithium depo...
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The Vereiskiy reservoir (Perm Region, Russia) is one of the complicated oil-bearing carbonate formations. It consists of interbedded carbonates and clayey rocks with low interbedded thickness (3–6 m), which makes its development unprofitable. But this reservoir is promising for oil production in the case of application of new technologies (especial...
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Replanting of mining soils is necessary for utilizing soil resources and increasing cultivated land areas. However, limited information exists on the long-term temporal trends of carbon accrual in agricultural systems containing carbonate-rich soil material. We examined changes in soil organic carbon (SOC), soil inorganic carbon (SIC), and total ca...
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Characterization of fluid–rock interactions is essential for a broad range of subsurface applications such as understanding fluid flow in porous medium and enhanced oil recovery predictions. Enhanced oil recovery (EOR) is crucial in oil and gas production operations, it entails injecting fluids into the reservoir to enhance productivity. When fluid...
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Assessment of fire performance of concrete structures requires complete knowledge of material properties and constitutive relationships. The existing mathematical models present the behaviour of mechanical properties of concrete at elevated temperatures. Most proposed models are based on experimental test results with significant variation in incor...
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The remaining oil distribution plays an important role in enhanced oil recovery (EOR), which directly guides the development of an oil reservoir in the middle and later stages. However, it is still challenging to accurately and efficiently characterize the distribution of remaining oil due to the complex reservoir geology. We propose a data-driven...
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Red Mediterranean Soils developed over carbonate rocks can precipitate pedogenic carbonates at the base of their profiles, forming an evolutionary stage of calcretes. We studied a 0.6 m deep soil profile in Dalmatia (Croatia) where the lowest section of the soil is a calcic horizon formed by diffuse calcite particles and small nodules. These nodule...
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An investigation of the cycling stability of anode-free batteries (AFBs) using dilute dual-salt electrolytes is conducted in a mixture of ether and carbonate solvents. Using the AFB configuration, various compositions of the dual-salt electrolyte were optimized and it was found that 0.9M-LiTFSI+0.3M-LiDFOB in FEC/TTE (2:3, v/v) is the best. An in-d...
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The presence of anhydrite in various forms and textures is a common diagenetic feature in many carbonate reservoirs. In this study, focusing on carbonate reservoirs of the upper Dalan and Kangan formations in the Persian Gulf, a syngenetic classification of anhydrite based on petrographic evidence and core description is proposed. As a result, earl...
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To understand the variations in carbonate burial for the last 30 kiloannum (ka), we have utilized a core from the Ocean Drilling Program (ODP), Site716A (04.56°N and 73.17°E) retrieved from a water depth of 533 m from the Maldives (carbon-ate platform) Sea. We analysed calcium carbonate (CaCO 3 %), sedimentary organic carbon (C-org %) and shell wei...
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Facies analysis and paleogeographical reconstruction of the Asmari Formation in the Lorestan and Dezful Embayment Zones are documented by studying eight outcrop sections and two wells. The new observations provide a basis for correlation and description of the carbonate ramp evolution during the Early Oligocene–Middle Miocene time. Petrographic exa...
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This workpresents a first screening of electrodialytic remediation (EDR) of eutrophic freshwater sediments contaminated by heavy metals. Sediments were collected from two heavily contaminated waterbodies north of Copenhagen, Denmark (Raadvad millpond and Bagsvaerd lake), and a less contaminated lake in an agriculturally impacted area of Jutland, De...
Article
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Wells drilled in carbon storage sites could be converted to potential leakage pathways in the presence of CO2-bearing fluids and under the impact of the changes occurring in underground stress. To test this hypothesis, in this study, the behavior of Class G oil well cement in contact with supercritical CO2 has been investigated. The cement cores we...
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In this study, the novel neutral cobaloximes and corresponding to different cobaloxime-based double complex salts were prepared and for the first time evaluated as an efficient catalyst for the synthesis of cyclic carbonates from epoxides and CO2 without using any organic and inorganic solvents. After seeing the efficient catalytic performance of d...
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Strike-slip faults developed in the middle lower Ordovician carbonate formation in the T-SH area of Tarim Basin play an important role in controlling the migration and accumulation of hydrocarbon. The reservoir in the study area is reformed by multi-period fluid, and the influence of different component fluid on different positions of fault is of g...
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The development of novel catalysts for the synthesis of cyclic carbonates under mild conditions remains a challenge. Herein, we designed the strategy of immobilizing DBU-based ionic liquid on mesoporous SBA-15 (DBU@SBA-15), due to the cooperative effect between silanol and bromide anion, DBU@SBA-15 exhibits high CO2 catalytic performance under solv...
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The Barra Velha Formation encompasses the most important hydrocarbon reservoirs of the Pre-salt section of the Santos Basin, SE Brazil, and its lacustrine carbonates have drawn much attention in the past decade due to their sedimentological complexity and overall heterogeneity. Among the main challenges in the characterization of such rocks are the...
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Calcium-ion batteries heed the research attention as a energy storage system due to the merits of natural abundance, low-cost, reduction potential (−2.87 V vs. SHE) similar to lithium (−3.04 V vs. SHE) and high theoretical working potential of calcium. However, the practical realization experiences a barrier due to the lack of suitable high-voltage...
Article
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El presente trabajo fue desarrollado en el Complejo Volcánico Planchón-Peteroa en la provincia de Mendoza, Argentina. Su objetivo es analizar y describir los principales procesos geoquímicos que se desarrollan y controlan la composición de las aguas pertenecientes al sistema hídrico del complejo volcánico. Dichas aguas fueron clasificadas a partir...
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This paper aims to characterize the EQ (earthquake)-triggered landslides and to assess the EQ-triggered landslide susceptibility in moderate-minor earthquake prone areas at the southern margin of Sichuan Basin, China. 284 EQ-triggered landslides were inventoried from field-based investigation and dominated by rockfall, soil slide, and rock avalanch...
Article
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Based on the results of a study of the porous carbonate rocks in the Jinping area conducted from 2004 to 2019, we developed a research algorithm to analyze polarized images of these rocks and compared the porosity magnification of these polarized images. We obtained the current karst development rate by combining the historical karst development ra...
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Cobalt is a good material for catalysis, energy, and many other applications. In this study, a cobalt coating was prepared by applying electrodeposition in an ethylene carbonate (EC) -AlCl3-CoCl2 electrolyte system at 333 K. The electrical conductivity of the 0.97EC-0.02AlCl3-0.01CoCl2 system at 318–363 K varied with the temperature based on the fo...
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Carbonate sediments play a prominent role on the global geological stage as they store more than $$60\%$$ 60 % of world’s oil and $$40\%$$ 40 % of world’s gas reserves. Prediction of the deformation and failure of porous carbonates is, therefore, essential to minimise reservoir compaction, fault reactivation, or wellbore instability. This relies on...
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The main carbon dioxide (CO 2 ) emissions in Thailand come from the energy sector. Gas-based power plants, including natural gas and biogas, are CO 2 point sources, and are mostly located in the Khorat Plateau. Geological CO 2 storage is an important element in the effort to reduce CO 2 emissions from CO 2 point sources. This study is a preliminary...
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The quality of groundwater for irrigation was studied from different locations of Palghar and Dahanu Tehsils of Coastal Konkan in Maharashtra in the month of May 2016 (pre-monsoon) and October 2016 (post-monsoon). The results obtained from investigation revealed that all irrigation water samples from Palghar and Dahanu tehsil were slightly saline i...
Article
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Biological methods (adding bacteria to the concrete mixtures) among the most recently investigated procedures increase the durability of concrete and repair concrete cracks. In the present study, different biological methods were used to heal the cracks of concrete and the most suitable method was subsequently introduced as the main aim of the rese...
Article
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In this study, the experiments were carried out to investigate the influence of Pd catalyst supported on M-doped (M = La, Ba and K) CeO2 for methane oxidation activity with a fixed-bed reactor. The structure, morphology and active species of Pd-M/CeO2 catalysts were thoroughly investigated with the means of TEM, BET, XRD, XPS, CO chemisorption, H2-...
Conference Paper
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Desde fi nes del Jurásico a comienzos del Cenozoico todo América del Sur se vio afectada por un régimen tectónico extensional generalizado, relacionado a la ruptura del supercontinente Gondwana y la apertura del Océano Atlántico al este (Galliski y Viramonte 1988). En particular, desde el noroeste de Argentina (NOA, principalmente Salta y Jujuy), n...
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The outcrops of carbonate and siliceous rock horizons at the boundary of Eocene and Oligocene deposits in the Ukrainian Carpathians represent potential sites for geotourism. They are located in the northern part of the Skyba zone, in settlements (Boryslav, Verkhne Synyovydne, Maydan, Skole) that can be reached by various vehicles. The sites are of...
Article
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Jialingjiang Formation is a typical low permeability carbonate reservoir in Sichuan Basin, which is characterized by strong heterogeneity, low matrix permeability and high-water saturation. Based on seven influencing factors, such as permeability, reservoir thickness and reservoir porosity, this paper evaluates and predicts the oil recovery of Jial...
Article
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Acid enhanced oil recovery has been a focus of interest in the oil industry due to its significant results on improved recovery, especially in carbonate reservoirs. However, in carbonate reservoirs, highly conductive pathways called “wormholes” are created when acidic fluids are injected into carbonate rocks. Wormholes could jeopardize the enhanced...
Article
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There is a growing need to find ways to reuse fine concrete waste from the construction industry. In this study, recycled concrete fines were granulated and used as lightweight aggregates. Ladle slag, a steel industry residue, was used as a co-binder in different ratios (0, 10, 20, and 30%). The materials were blended and granulated, and then the g...
Preprint
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We construct a new computational model to describe coupled 3D/1D flow in carbonate rocks 6 intertwined by a network of karst cave conduits. The proposed approach shows ability to incorporate 7 pointwise velocity-dependent jumps in the pressure field, arising from localized partial obstructions 8 due to the presence of collapse-breccia within the di...
Article
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Calicoblastic epitheliomas (CEs) have been studied in corals of the Caribbean and the Gulf of Oman. We assessed the chemical characteristics of the disease in Acropora valida corals in Chabahar Bay in the northern Gulf of Oman. The tumors appeared as discolored nodular masses occupying < 20% of the total colony area. The prevalence of the disease w...
Article
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Flexible strain sensor has attracted much attention because of itspotential application in human motion detection. In this work, the preparedstrain sensor was obtained by encapsulating electrospun carbonized sponge(CS) with room temperature vulcanized silicone rubber (RTVS). In this paper,the formation mechanism of conductive sponge was studied. Ba...
Article
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Organic solvents with low Henry's constants, such as propylene carbonate (PC) and sulfolane, were proposed to be used as CO2 absorbents to increase CO2 absorption capacity in the CO2 switchable solvent, so that the dissolution of cellulose can be effectively enhanced. With the addition of PC, the maximum concentration achieved for the dissolution o...
Article
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The salinity of continental lacustrine basin has a great influence on the properties of shale. The main objective of this paper is to present the characteristics of shale in different saline stages. In this study, we restored the saline process by the Kauchi method and evaluated the hydrocarbon generation capacity, reservoir property, oiliness and...
Article
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Phytolith is widely known as a silica structure in numerous silicon (Si) accumulator plants, e.g., rice, and it contains various nutrients and other beneficial elements. When rice straw is returned to paddy fields, the silica structure of phytolith can be dissolved, thereby releasing its occluded nutrients. While the intrinsic characteristics and d...
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Globally, Late Permian to Early Triassic carbonate rocks record several pronounced positive and negative C-isotope excursions, indicating a dramatic reorganization of the global carbon cycle. These C-isotopic anomalies provide important constraints on environmental changes that occurred during the end-Permian extinction and the subsequent delayed b...
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Due to the technological limitations associated with beneficiation technology, large amounts of flotation reagents and heavy metals remain in mineral processing wastewater. Unfortunately, however, no treatment methods are available to mitigate the resulting pollution by them. In this study, a bacterial consortium SDMC (simultaneously degrade butyl...
Article
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Carbonated droplets deposited on a superhydrophobic surface float on a self-generated cushion of gas.
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Salen-based covalent organic framework (COF), constructed by salen skeleton, has great potential applications as the heterogeneous catalyst due to its unique salen-functionalized structure and uniform porous microenvironment. In this study, the mesoporous crystalline salen-COF was facile synthesized via heating salicylaldehyde and ethylenediamine i...
Article
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Garlic peel (GP), as a readily available agricultural waste, has been successfully employed to synthesize a carbon-based solid acid catalyst, which, in turn, has been used to catalyze the esterification of oleic acid with methanol for biodiesel production. Several GP-based catalysts have been synthesized by partial carbonization at various temperat...