Relevant bibliographies by topics / Fibre de carbonate de calcium

Academic literature on the topic 'Fibre de carbonate de calcium'

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Published: 7 July 2024

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Journal articles on the topic "Fibre de carbonate de calcium":

1

Rachman, Maulana, Kasda Kasda, Achmad Moeslihat Komara, Harjadi Gunawan, and Djoko Setyanto. "PHYSICAL-MECHANICAL PROPERTIES OF PINEAPPLE LEAF FIBRE REINFORCED IN UNSATURATED POLYESTER RESIN FILLED WITH CALCIUM CARBONATE." Jurnal Rekayasa Mesin 14, no. 3 (December 15, 2023): 909–25. http://dx.doi.org/10.21776/jrm.v14i3.1451.

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Using natural fibres is often recommended as polymer composite materials owing to their potential to reduce the pollution of synthetic material waste. This study aimed to obtain the physical properties of unsaturated polyester resin matrix composite containing calcium carbonate fillers of 15 and 30 parts per hundred weights of the resin and natural pineapple leaf fibre of the amount 20% and 30% of the composite weight. The composite samples were three millimetres thick, with the pineapple leaf fibres arranged in one longitudinal direction. Some parameters observed included density, water absorption, response to fire, hardness, tensile strength, modulus of elasticity, and impact strength. The results showed that adding calcium carbonate filler into the matrix increased the density, water absorption, hardness, and modulus of elasticity of the composite. However, it reduced the flame propagation rate, tensile strength, and impact strength. Also, the use of pineapple leaf fibre contributed to increased water absorption, rate of flame propagation, tensile strength, modulus of elasticity, and impact strength of the composite, but it reduced the density and hardness. As these samples use economical materials, they are likely valuable for building materials that do not require high mechanical properties, especially guttering materials.
2

Drouhet, Quentin, Romain Barbière, Fabienne Touchard, Laurence Chocinski-Arnault, and David Mellier. "The Natural Growth of CaCO3 Crystals on Hemp Yarns: A Morphology Analysis and the Mechanical Effects on Composites." Fibers 11, no. 10 (October 20, 2023): 88. http://dx.doi.org/10.3390/fib11100088.

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Plant fibres are promising candidates to replace synthetic fibres in polymer matrix composites. However, there is still an important issue to overcome: the poor quality of adhesion at the fibre/matrix interface. Many surface treatments of plant fibres have been developed, most of them based on non-environmentally friendly processes. In this paper, a 100% natural treatment is proposed. Hemp yarns are immersed in tap water until the natural growth of limestone beads attached to their surface occurs. The morphology analysis reveals that these calcium carbonate crystals have a nanoneedle architecture, with hemp fibres acting as nucleators for these highly ordered coral-like structures. Tensile tests on ±45° woven hemp/epoxy composites show that the presence of CaCO3 beads improves the adhesion quality of the fibre/matrix interface and, therefore, increases Young’s modulus value.
3

Chen, Xiaoyu, Xueren Qian, and Xianhui An. "Using calcium carbonate whiskers as papermaking filler." BioResources 6, no. 3 (May 7, 2011): 2435–47. http://dx.doi.org/10.15376/biores.6.3.2435-2447.

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Whiskers, having large length/diameter ratio, are fiber-shaped single crystals. The technical possibility of using calcium carbonate whiskers as papermaking filler to replace conventional powder-like calcium carbonate was investigated. The results showed that it may be feasible to use calcium carbonate whisker as papermaking filler. Compared with conventional precipitated calcium carbonate, calcium carbonate whisker had higher retention efficiency. The use of calcium carbonate whisker also favorably affected the strength properties of paper sheets. A model was proposed to suggest the mechanism for paper strength improvement. The whiskers filled in paper sheets could increase the friction between fibers, thus increasing bonding strength. Moreover, the strength properties of paper were further improved because calcium carbonate whiskers were partly embedded in pulp fiber walls.
4

Lee, Y. J., Y. Kim, Soo Ryong Kim, Dong Geun Shin, Sea Cheon Oh, and Woo Teck Kwon. "Size Effect of CaCO3 Filler on the Mechanical Properties of SMC Composites." Defect and Diffusion Forum 365 (July 2015): 244–48. http://dx.doi.org/10.4028/www.scientific.net/ddf.365.244.

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SMC composites consist of chopped glass fiber as a reinforcements, polyester and mineral fillers. Among them, filler is one of the important factors for improving mechanical and thermal properties of composites, but it has not drawn much attention for SMC composites. In this study, the size effect of calcium carbonate as mineral filler on mechanical properties of SMC composites was discussed using five different sizes of commercial calcium carbonates without chopped fiber reinforcement, to focus on the size effect itself. The SMC process was modified to be suitable for a laboratory scale composed of three steps. The mean sizes of the calcium carbonates were 3 – 20 μm, and the specific surface areas were calculated to be 1 – 5 m2/g by BET. Small size of calcium carbonate having high surface area up to 4 m2/g showed high thermal resistance, and showed higher strength comparing to the large fillers because it affected to form a dense packed microstructure.
5

Jiang, Weijian, Wen Yi, and Lei Zhou. "Fibre-Microbial Curing Tests and Slope Stability Analysis." Applied Sciences 13, no. 12 (June 12, 2023): 7051. http://dx.doi.org/10.3390/app13127051.

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In response to the deformation resistance deficiency and poor toughness characteristics of soil after microbial curing, a combination of fibre reinforcement technology and microbial curing technology was used to conduct microbial curing tests using basalt fibres and denitrifying bacteria. In this paper, the effects of fibre on the strength and toughness of soil consolidation were analysed by unconfined compressive strength test and direct shear test, and the stability of reinforced slope was analysed by numerical simulation. The results show the following. (1) Basalt fibre can effectively improve the characteristics of brittle damage of microbially consolidated soil while increasing the compressive and shear strength. (2) Fibre dosing and fibre length have important effects on the mechanical properties of microbially consolidated soil. (3) The appropriate amount of basalt fibre can promote the generation of calcium carbonate. (4) The plastic strain area of the slope decreases after microbial reinforcement and the maximum equivalent plastic stress decreases by 65 kPa.
6

Jimoh, Onimisi A., Patrick U. Okoye, Tunmise A. Otitoju, and Kamar Shah Ariffin. "Aragonite precipitated calcium carbonate from magnesium rich carbonate rock for polyethersulfone hollow fibre membrane application." Journal of Cleaner Production 195 (September 2018): 79–92. http://dx.doi.org/10.1016/j.jclepro.2018.05.192.

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7

He, Hongwei, Zheng Zhang, Jianlong Wang, and Kaixi Li. "Compressive properties of nano-calcium carbonate/epoxy and its fibre composites." Composites Part B: Engineering 45, no. 1 (February 2013): 919–24. http://dx.doi.org/10.1016/j.compositesb.2012.09.050.

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8

Sathiyamurthy, S., A. Syed Abu Thaheer, and S. Jayabal. "Mechanical behaviours of calcium carbonate-impregnated short coir fibre-reinforced polyester composites." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 226, no. 1 (November 2, 2011): 52–60. http://dx.doi.org/10.1177/1464420711422794.

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9

Zhang, Zhe, Pan Zou, Yiguang Wang, and Xun Zhang. "Impact of Nano-CaCO3 and PVA Fiber on Properties of Fresh and Hardened Geopolymer Mortar." Buildings 13, no. 6 (May 26, 2023): 1380. http://dx.doi.org/10.3390/buildings13061380.

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Geopolymer is a green substitute for Portland cement but has low tensile strength, high brittleness and easy cracking. Therefore, fibers and nanomaterials are used to strengthen and toughen geopolymer composites. The influence of nano-calcium carbonate and PVA fiber on the properties of fresh and hardened geopolymer mortar were studied herein. The hybrid of long and short fibers with small content (0.8 vol.%) is conducive to flowability, while the hybrid with large content (1.6 vol.%) and nano-calcium carbonate is conducive to flowability. The slump flow and flow rate of geopolymer mortars with low fiber factor (product of fiber volume fraction and length-diameter ratio) decrease with the growth in nano-calcium carbonate content. As the PVA fiber factor reaches 464.8%, the slump flow and flow rate values of mortars with 0, 1 wt.% and 2 wt.% nano-calcium carbonate are close to each other. About 450% is the density packing threshold of PVA fiber in geopolymer composites. The combination of 0.8 vol.% 12 mm + 0.4 vol.% 6 mm fiber + 1 wt.% nano-calcium carbonate presents the highest flexural strength and flexural to compressive strength ratio, with a compressive strength of about 36 MPa. The optimal fiber factor range of PVA fiber in cement and geopolymer mortar is about 400% and higher than 600%, respectively. PVA fibers show more effective enhancement of flexural strength and toughness in geopolymer than cement mortar. The ultrasonic wave velocity and apparent density of geopolymer mortar show a downward trend as a whole with the increase in fiber factor. The intensity rise of the hump between 17° and 38° (2 θ) in the XRD pattern is observed. The SEM indicates that the surface of PVA fiber in geopolymer mortar with nano-calcium carbonate is heavily scratched, and the fiber filaments are rolled up, demonstrating improved bonding between PVA fiber and geopolymer mortar.
10

bin Muhamad Nor, Mohd Al Amin, and Nur Hawa Hazwani Ya’acob. "Development of Decorative Ceramic Glaze from Palm Fiber Ash." Key Engineering Materials 690 (May 2016): 259–63. http://dx.doi.org/10.4028/www.scientific.net/kem.690.259.

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Palm fiber ashes are the industrial waste which is abundantly available in Malaysia. In this study, palm fiber ash were used to produce decorative ceramic glaze. The content of minerals in the palm fiber ash were analyzed by using X-Ray Diffraction (XRD) and X-Ray Fluorescence (XRF), respectively. The formulations of glaze with different composition of raw materials were studied by adding different amount of calcium carbonate and feldspar. The glaze slurries then coated on ball clay body bisque which was obtained from Kg. Dengir and sintered at 1200 ° C for two hours.The glaze was characterized in term of its physical appearance such as type of glaze and colour. Both glossy and matte glaze produced by using different composition of glaze formulation. The presence of silica minerals (79 %) contributed to glossy surface to the glaze. It is clearly seen that the glossiness of glaze improved by increasing amount of feldspar. Feldspar acts as fluxing agent which form a glassy phase at lower temperature. In addition, the presence of small amount of iron oxide (2.2 wt.%) contributed to brown colour of glaze. An addition of calcium carbonate give effect to the colour of glaze, which change from brown to yellow colour as amount of CaCO3 increased. As a conclusion, the palm fibre ashes were highly suitable to supply abundant and cheap raw materials to produce decorative ceramic glaze.
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Journal articles Dissertations / Theses Books

Dissertations / Theses on the topic "Fibre de carbonate de calcium":

1

Longkaew, Khansinee. "Preparation of calcium carbonate particles for application in natural rubber composites." Electronic Thesis or Diss., Le Mans, 2024. https://cyberdoc-int.univ-lemans.fr/Theses/2024/2024LEMA1003.pdf.

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Cette recherche vise à synthétiser différents types et formes de particules de carbonate de calcium (CaCO3) à l'échelle submicrométrique et nanométrique, et à étudier leurs applications en tant que charges renforçantes pour les composites de caoutchouc naturel (NR). L'étude a donc été divisée en deux parties. Premièrement, la procédure de préparation des particules de CaCO3 était basée sur la méthode de précipitation en solution entre les ions carbonate (CO32-) et les ions calcium (Ca2+). La deuxième partie concerne l'étude des propriétés mécaniques des composites NR/CaCO3. La première partie a commencé par la précipitation de (NH4)2CO3 et de CaCl2 dissous dans 50 % en poids de saccharose comme milieu aqueux. Cette condition a entraîné la formation de CaCO3 sphérique, ce qui a été mis en évidence au microscope électronique à balayage (MEB). L'analyse au microscope électronique à transmission (TEM) a révélé une taille de particule de 0,42 ± 0,14 µm avec un rapport d'aspect d'environ un. Lorsque la réaction de précipitation s'est produite en présence d’huile d'olive saponifiée, la propriété de surface du CaCO3 est passée d'hydrophile (angle de contact avec l'eau de 28 ± 2°) à superhydrophobe (angle de contact avec l'eau de 163 ± 2°). Les phases polymorphes typiques de CaCO3 ont été caractérisées par diffraction des rayons X (DRX), infrarouge à transformée de Fourier par réflexion totale atténuée (ATR-FTIR) et spectroscopie Raman. Ces techniques ont révélé que le CaCO3 sphérique non traité et traité représentait environ 99 % du polymorphe de la vatérite. Dans le processus de précipitation utilisant des solutions aqueuses 1 M de Na2CO3 et 1 M de CaCl2 réalisé à 80 ± 1 °C, du CaCO3 sous forme de fibres agglomérées a été obtenu avec un rapport d'aspect compris entre 8 et 9. Le CaCO3 superhydrophobe sous cette forme a également été synthétisé avec succès. L'angle de contact avec l'eau des fibres traitées et non traitées est respectivement de 29 ± 2° et 167 ± 2°. De plus, le CaCO3 sphérique dispersé dans l'eau à 80°C a donné naissance à des nanoparticules de CaCO3 en forme de fibre qui ont été obtenues via la transformation de la vatérite sphérique en aragonite nanofilaire longue avec le rapport d'aspect le plus élevé de 156,9 par rapport aux autres formes de CaCO3. La fibre CaCO3 non traitée était hydrophile avec un angle de contact avec l'eau de 31 ± 1°, tandis que la fibre CaCO3 traitée avec du savon donnait un angle de contact avec l'eau de 165 ± 5° ; elle était donc superhydrophobe similaire aux autres polymorphes de CaCO3 synthétisés. La DRX a révélé que le CaCO3 en forme de fibres, non traitées et traitées, contenait en majorité de l'aragonite et en moindre mesure de la vatérite et de la calcite. La stabilité thermique de différents types de CaCO3 a également été évaluée par analyse thermogravimétrique (TGA). Les résultats ont montré la calcination des cristaux de CaCO3, du saccharose et du savon. La deuxième partie a consisté à incorporer le CaCO3 préparé (0, 5, 10, 20, 40, à 60 pce) dans du latex naturel (NR). Il a été constaté que la vatérite CaCO3 non traitée et traitée était stable dans le milieu latex NR. De plus, les polymorphes du CaCO3 non traité et traité en forme de fibres étaient également stables dans leurs formes lorsqu'ils étaient ajoutés au latex NR. Les propriétés mécaniques du NR/CaCO3 comprenaient la résistance à la traction, l'allongement à la rupture, la résistance à la déchirure et la dureté Shore A. Il a été constaté que la résistance à la traction des composites NR/CaCO3 augmentait lorsque la charge de CaCO3 augmentait. La résistance à la traction du NR s'est améliorée de 22,68 ± 2,22 MPa de NR pur jusqu'à 23,94 ± 0,97 MPa lorsque des poudres de CaCO3 sphériques non traitées (20 phr) ont été ajoutées, et à 25,28 ± 0,80 MPa de CaCO3 sphérique traité (20 phr) de NR rempli. (...)
This research aims to synthesize different types and shapes of calcium carbonate (CaCO3) particles at a submicrometric and nanoscale, and investigate their applications as reinforcing fillers for natural rubber (NR) composites. The study was therefore divided into two parts. Firstly, the preparation procedure of CaCO3 particles was based on the solution precipitation method between carbonate ions and calcium ions. The second part focused on investigating the mechanical properties of NR/CaCO3 composites. The first part started with the precipitation of (NH4)2CO3 and CaCl2 dissolved in 50% by weight of sucrose as the aqueous medium. This condition resulted in spherical CaCO3 with particle size of 0.42±0.14 µm with an aspect ratio of about one. When the precipitation reaction occurred in the presence of olive soap, the surface property of the CaCO3 was changed from hydrophilic (water contact angle of 28±2o) to superhydrophobic powders (water contact angle of 163±2o). The typical polymorphic phases of CaCO3 were characterized. The results revealed that both untreated and treated spherical CaCO3 were about 99% of the vaterite polymorph. In the precipitation process using Na2CO3 and CaCl2 aqueous solutions performed at 80±1C, bundle-liked CaCO3 was obtained with an aspect ratio in the range of 8–9. The superhydrophobic bundle-liked CaCO3 was also successfully synthesized by soap treatment. The water contact angle of untreated and treated bundle-liked are 29±2o, and 167±2o, respectively. Furthermore, the spherical CaCO3 dispersed in water at 80C resulted in the fiber-shaped CaCO3 nanoparticles which were achieved via the polymorph transformation from spherical vaterite to long nano-wired aragonite with the highest aspect ratio of 156.9. The untreated fiber CaCO3 was hydrophilic with a water contact angle of 31±1o, while the treated fiber CaCO3 with soap resulted in 165±5o of water contact angle, hence it was superhydrophobic similar to other synthesized CaCO3 polymorphs. The XRD revealed that the untreated and treated bundle-liked and fiber-shaped CaCO3 contained the majority of aragonite followed by vaterite and calcite polymorphs. The second part was carried out to incorporate the prepared CaCO3 (0,5,10,20,40,60 phr) in NR latex. It was found that the CaCO3 polymorphs were stable in the NR latex medium. The mechanical properties of NR/CaCO3 included tensile strength, elongation at break, tear strength, and hardness Shore A. It was found that the tensile strength of NR/CaCO3 composites increased when CaCO3 loading was increased. The tensile strength of NR improved from 22.68±2.22 MPa of neat NR up to 23.94±0.97 MPa when untreated spherical CaCO3 powders (20 phr) were added, and to 25.28±0.80 MPa of treated spherical CaCO3 (20 phr) filled NR. The maximum tensile strength of NR/untreated bundle-liked CaCO3 was 30.59±3.50 MPa at 40 phr of loading while 31.51±1.02 MPa of NR/treated bundle-liked CaCO3 at filler loading 20 phr was obtained. The treated CaCO3-filled NR vulcanizates gave higher tensile strength than the untreated ones. This was caused by better compatibility of filler dispersion between the hydrophobicity of treated CaCO3 and hydrophobic property of NR. As a result, it was found that the NR filled with untreated fiber CaCO3 particle provided the highest tensile strength of 31.66±1.80 MPa at 10 phr of filler loading, over other types of CaCO3. The nanoparticle, large surface area, and high aspect ratio of fiber/ long nano wired of CaCO3 enhanced the interfacial adhesion between CaCO3 and NR matrix which could transfer stress from rubber to filler effectively during stretching. This resulted in the reinforcing efficacy of the fiber CaCO3. In summaroze, the prepared CaCO3 powders have the potential to broaden their application not only as diluents or additives but also as reinforcing agents
2

Reygrobellet, Jean-Noël. "Recyclage de composites fibres de verre-polyester insaturé-carbonate de calcium par réincorporation dans des matrices thermoplastiques." Montpellier 2, 2000. http://www.theses.fr/2000MON20038.

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3

Safa, Ali Ibrahim 1953. "Catalytic Calcination of Calcium Carbonate." Thesis, North Texas State University, 1985. https://digital.library.unt.edu/ark:/67531/metadc330965/.

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The calcination of calcium carbonate in a cement or a lime kiln uses approximately two to four times the theoretical quantity of energy predicted from thermodynamic calculation depending upon the type of the kiln used (1.4 x 10^6 Btu/ton theoretical to 6 x 10^6 Btu/ton actual). The objective of this research was to attempt to reduce the energy required for the calcination by 1. decreasing the calcination temperature of calcium carbonate, and/or 2. increasing the rate of calcination at a specific temperature. Assuming a catalytic enhancement of 20 percent in the industrial applications, an energy savings of 300 million dollars annually in the United States could be reached in the cement and lime industries. Three classes of compounds to date have shown a positive catalytic effect on the calcination of calcium carbonate. These include alkali halides, phospho- and silico-molybdate complexes, and the fused carbonates system.
4

Xu, Yaling Pelton Robert H. "Calcium carbonate adhesion in paper /." *McMaster only, 2005.

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Loste, Madoz Eva. "Morphological control of calcium carbonate." Thesis, Queen Mary, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398861.

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Daly, P. J. "Dissolution kinetics of calcium carbonate." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372693.

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7

Picard, Quentin. "Biomatériaux hybrides : tissu de fibres de carbone / phosphates de calcium : synthèse, caractérisation et biocompatibilité." Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2073/document.

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Ce travail a consisté à élaborer un biomatériau hybride constitué d’un tissu de fibres de carbone (TFC) revêtu de phosphates de calcium (CaP) déposés par un procédé de sono-électrodéposition et à étudier l’influence des paramètres expérimentaux sur la composition chimique, la microtexture et la structure des revêtements phosphocalciques, ainsi que la biocompatibilité in vitro du biomatériau hybride. La densité de courant s’est avérée être un paramètre important. Pour de fortes densités de courant (≥ 100 mA/g), un régime d’électrolyse rapide de l’eau entraîne la formation d’un dépôt aciculaire d’hydroxyapatite déficitaire en calcium (CaD-HAP) carbonatée avec la présence éventuelle d’une phase de calcite. Pour de faibles densités de courant (≤ 50 mA/g), un régime d’électrolyse lent de l’eau entraîne la formation d’un dépôt plaquettaire de CaD-HAP carbonatée issu de l’hydrolyse in situ du phosphate octocalcique plaquettaire préalablement précipité. Pour l’ensemble des dépôts, les particules sont constituées d’un coeur de CaD-HAP carbonatée de structure ordonnée et d’une surface hydratée de CaD-HAP carbonatée de structure désordonnée qui résulte de l’existence d’une zone de sursaturation lors de la précipitation des CaP. La sono-électrodéposition se révèle être un procédé versatile capable d’orienter la synthèse des phases de CaP, avec pour une faible densité de courant appliquée l’obtention d’un dépôt biomimétique comparable à la partie minérale du tissu osseux obtenue par le processus d’ostéogénèse naturelle. Des tests de viabilité in vitro réalisés avec des ostéoblastes humains primaires ont montré que la nanoporosité et le caractère hydrophile des TFC n’impactent pas la biocompatibilité et que les paramètres tels que le précurseur des fibres, l’ensimage et/ou la forme lobée des fibres semblent favoriser l’adhésion et la prolifération des cellules
This work is focused on the synthesis of a novel hybrid biomaterial made of carbon fibers cloth (CFC)/ calcium phosphates (CaP) using the sono-electrochemical technique and the study of the influence of experimental parameters on the chemical composition, microtexture and structure of CaP deposits and on in vitro biocompatibility. Current density is shown to be a crucial parameter. Specifically, at high current densities ((≥ 100 mA/g), the fast water electrolysis rate leads to a needle-like deposit consisting in a major phase of carbonated calcium deficient hydroxyapatite (CaD-HAP) mixed with a calcium carbonate phase. At low current densities (≤ 50 mA/g), the slow water electrolysis rate generates a plate-like carbonated CaD-HAP phase, coming from the in situ hydrolysis of a former octacalcium phosphate phase. Whatever the experimental conditions, particles of the deposits consists in a carbonated CaD-HAP core showing an ordered structure, surrounded by a hydrated and disordered carbonated CaD-HAP surface layer which results of the formation of oversaturated domains during CaP precipitation. Sono-electrodeposition is shown to be a versatile process able to control the nature of CaP phases. Especially, at low current density a biomimetic CaP deposit is obtained, similar to the mineral part of bones produced during natural osteogenesis. In vitro biologic tests using primary human osteoblasts showed that the nano-porosity and hydrophilicity of the carbon fibers do not affect the biocompatibility and that fiber precursor, sizing and lobe shaped fibers seems to favor adhesion and proliferation of human cells
8

Lam, Siu Kai Raymond. "Calcium carbonate deposition in synthetic systems." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492548.

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The work presented in this thesis is concerned with the nucleation and growth of calcium carbonate (CaCO3). CaCO3 deposition on fabrics during the washing process is a major problem, causing fabric damage and harshness. It is important to understand the mechanism of CaCO3 nucleation in order to control its precipitation. The extent of crystallisation on different model fabrics was first investigated in order to understand the principal factors governing the crystal deposition. Surface topography of the fabrics such as the presence of steps and kinks was found to be the dominating factor for the nucleation of CaC03 crystals under the experimental conditions.
9

D'Souza, Sharon Marie. "Molecular imprinting of calcium carbonate crystals." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.428182.

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Wang, Q. "A computational study of calcium carbonate." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1333995/.

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This thesis presents the results of computer simulation studies of impurity incorporation in calcite and the aggregation of calcite particles, using a combination of classical computational techniques based on interatomic potentials, namely molecular mechanics and molecular dynamics simulations. Firstly, the atomistic simulation techniques have been employed to investigate the thermodynamics of mixing in calcite with seven divalent cationic impurities (Mg2+, Ni2+, Co2+, Zn2+, Fe2+, Mn2+ and Cd2+), based on the calculation of all inequivalent site occupancy configurations in 2 × 2 × 1 and 3 × 3 × 1 supercells of the calcite structure. In addition to the enthalpy of mixing, the configurational entropy and mixing free energy have also been calculated, providing an insight into the mixing behaviour as a function of the temperature for a series of carbonate solid solutions. The calculations have revealed that the solubility of the cationic impurities in calcite is largely related to the cationic coordination distance with oxygen. Secondly, the aggregation process has been investigated implementing classical computational techniques, and especially the interaction of a calcite nanoparticle with the major calcite surfaces, where the adhesion energy and optimised geometries of a typical calcite nanoparticle on different surfaces in vacuum and aqueous environment have been calculated. The results show the orientation of a nanoparticle is a key factor that effects the interactions, besides the size and structure of the nanoparticle. The most stable aggregated configuration occurs when the lattices of the nanoparticle and the surface are perfectly aligned. Finally, a number of symmetric calcite tilt grain boundaries have been constructed to act as models of two calcite nanoparticles, after collision has occurred but before growth has a chance to commence. Molecular dynamics simulations were then employed to study the stability of these tilt grain boundaries and the growth of a series of calcium carbonate units at the contact points in the pure and hydrated calcite tilt grain boundaries. The calculation have proved that the initial incorporation of a CaCO3 unit is preferential at the obtuse step in a grain boundary, and the growth velocity of the acute step is 1.3 to 2.1 times higher than that of the obtuse step, once the initial growth unit has been deposited on the steps. This study has evaluated the conditions required for the growth of new calcium carbonate materials in the calcite tilt grain boundaries.
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Books on the topic "Fibre de carbonate de calcium":

1

Tegethoff, F. Wolfgang, ed. Calcium Carbonate. Basel: Birkhäuser Basel, 2001. http://dx.doi.org/10.1007/978-3-0348-8245-3.

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Barber, B. Calcium carbonate in Zimbabwe. Harare: Zimbabwe Geological Survey, 1990.

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Ahsan, Tanweer. Surface characterization of the precipitated calcium carbonate. Uxbridge: Brunel University, 1987.

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Geological Survey (U.S.), ed. The distribution of calcium carbonate in soils: A computer simulation using program CALSOIL. [Denver, Colo.]: U.S. Dept. of the Interior, Geological Survey, 1986.

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Geological Survey (U.S.), ed. The distribution of calcium carbonate in soils: A computer simulation using program CALSOIL. [Denver, Colo.]: U.S. Dept. of the Interior, Geological Survey, 1986.

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Heijnen, Wilhelmus Marinus Maria. Crystal growth and morphology of calcium oxalates and carbonates =: Kristalgroei en morfologie van calciumoxalaten en-carbonaten. Alblasserdam: Offsetdrukkerij Kanters, 1986.

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Widmann, Beth L. Database of geochemical analyses of carbonate rocks in Colorado. Denver, Colo: Colorado Geological Survey, 2001.

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Wang, Chengyu. Gong neng xing na mi tan suan gai de fang sheng he cheng ji shu. 8th ed. Beijing: Ke xue chu ban she, 2009.

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Okonkwo, Jonathan Okechukwu. Surface study of uncoated and stearate coated precipitated calcium carbonate. Uxbridge: Brunel University, 1986.

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Wolfgang, Tegethoff F., Rohleder Johannes, and Kroker Evelyn, eds. Calcium carbonate: From the Cretaceous period into the 21st century. Basel: Birkhäuser Verlag, 2001.

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Book chapters on the topic "Fibre de carbonate de calcium":

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Bährle-Rapp, Marina. "Calcium Carbonate." In Springer Lexikon Kosmetik und Körperpflege, 81–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_1483.

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Xanthos, Marino. "Calcium Carbonate." In Functional Fillers for Plastics, 271–84. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605096.ch16.

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Gooch, Jan W. "Calcium Carbonate." In Encyclopedic Dictionary of Polymers, 109. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_1819.

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Khanna, Yash P., and Marino Xanthos. "Calcium Carbonate." In Functional Fillers for Plastics, 291–306. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527629848.ch16.

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Briggs, C. C. "Calcium carbonate." In Plastics Additives, 148–52. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5862-6_17.

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Geyssant, Jacques. "Features and characteristics of calcium carbonate." In Calcium Carbonate, 2–15. Basel: Birkhäuser Basel, 2001. http://dx.doi.org/10.1007/978-3-0348-8245-3_1.

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Heß, Peter. "Plastics." In Calcium Carbonate, 238–59. Basel: Birkhäuser Basel, 2001. http://dx.doi.org/10.1007/978-3-0348-8245-3_10.

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Strauch, Dieter. "Surface Coatings." In Calcium Carbonate, 260–74. Basel: Birkhäuser Basel, 2001. http://dx.doi.org/10.1007/978-3-0348-8245-3_11.

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Kuhlmann, Ralph. "Calcium Carbonate - A Versatile Mineral." In Calcium Carbonate, 275–311. Basel: Birkhäuser Basel, 2001. http://dx.doi.org/10.1007/978-3-0348-8245-3_12.

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Geyssant, Jacques. "The limestones - development and classification." In Calcium Carbonate, 15–30. Basel: Birkhäuser Basel, 2001. http://dx.doi.org/10.1007/978-3-0348-8245-3_2.

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Conference papers on the topic "Fibre de carbonate de calcium":

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Mohamed, Rahmah, Mohd Muizz Fahimi Mohamed, Mohd Nurazzi Norizan, and Raja Roslan Raja Mohamed. "Physical and morphological properties of filled calcium carbonate/kenaf fibre/rice husk polypropylene hybrid composite." In DISRUPTIVE INNOVATION IN MECHANICAL ENGINEERING FOR INDUSTRY COMPETITIVENESS: Proceedings of the 3rd International Conference on Mechanical Engineering (ICOME 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5047197.

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Saidler, Luila, Bruno Loureiro, Renato Siqueira, Arnaldo Leal Junior, and Leandro Macedo. "Detection of Calcium Carbonate Precipitation by Sensors Based on Fiber Optic Bragg Networks." In 19th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2022. http://dx.doi.org/10.26678/abcm.encit2022.cit22-0468.

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Silenius, Petri, and Matti Lindström. "Diffusion Controlled Kinetics of Electrolyte Transfer within the Pulp Fiber Wall: Estimation of Fiber Wall Pore Structure." In The Fundamentals of Papermaking Materials, edited by C. F. Baker. Fundamental Research Committee (FRC), Manchester, 1997. http://dx.doi.org/10.15376/frc.1997.2.815.

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Abstract:
A kinetic model for diffusion of ions within the fiber wall is introduced. A good fit for the model was obtained with data from experiments, where diffusion of electrolyte through the fiber wall was studied by means of simple conductivity measurements. This model together with the respective experimental data makes it possible to study the pore structure of fibers. For the experiments done the pore structure of fibers was first controlled by precipitating calcium carbonate within the fiber walls. It was found that the diffusion coefficient of ions within unfilled and calcium carbonate filled fiber wall was about 1 .5 and 0.5 % of that in water, respectively, when experiments were done for fibers without pit apertures. Experiments were made for fibers with different degree of drying as well. The results showed that the diffusion of electrolyte reduced with replicate dryings as expected. After the dryings, the diffusion coefficient was less than half of that within newer dried fiber.
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Breskvar, Kaja, Jure Ahtik, and Klemen Možina. "CRACKING OF COATED PAPERS AT THE FOLD." In XXV International Symposium in the Field of Pulp, Paper, Packaging and Graphics. University of Belgrade, Faculty of Technology and Metallurgy, 2024. http://dx.doi.org/10.46793/cpag24.061b.

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The phenomenon of cracking in paper coatings was investigated. Coating mixtures were compared according to their composition, the effects of cracking in the coating were determined, and certain combinations of the components of the base paper and the paper coating showed the lowest tendency to cracking. It was shown that the appropriate selection of pigments (calcium carbonate, kaolin) and binders (starch, latex), whose elastic properties influence the deformation of the paper under physical and mechanical stress, is of central importance. An important role is played by the choice of base paper, which should contain as many cellulose fibres as possible and be as long as possible in order to avoid fibre breaks and their interconnections. The content of inorganic substances has a demonstrably negative effect by worsening the physical-mechanical properties of the paper and leading to the deposition of inorganic substances at the joints between the cellulose fibres and reducing their bonding.
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Wei, L., D. Syamsunur, S. Surol, M. N. H. B. Jusoh, and N. I. M. Yusoff. "COMPOSITE NANOPARTICLE CONCRETE BASE ON FIRE AND EXTREME HIGH-TEMPERATURE ENVIRONMENT." In 7th International Conference on Sustainable Built Environment. Universitas Islam Indonesia, 2023. http://dx.doi.org/10.20885/icsbe.vol2.art6.

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The critical position of concrete plays a decisive role in engineering applications where extreme high-temperature environments severely affect the durability and life cycle of concrete structures. Experiments were conducted to mimic fire and extreme high-temperature environments, using different activities of nano calcium carbonate (NC) and nano silica (NS) to replace cement mixed concrete at 2.5%, 3.0% and 3.5% respectively, and a series of data analysis of nano concrete to derive patterns of performance change and drive new momentum for progress in the concrete industry. Experimental studies were conducted to explore the decaying changes in the mechanical properties of nano concrete after the concrete modified with composite nanomaterials was heated at different temperature environments of 25°C, 200°C, 400°C and 600°C. The results showed that the mechanical compressive strength of the nano concrete increased by 17.05%, 21.81% and 23.00% at 7 days respectively compared to the control concrete, and the nano 3.0% admixture showed excellent mechanical properties in the range of 25°C to 600°C. The results show that the strength checks of the nano-concrete cube and cuboid specimens after heating through different high-temperature environments were similar in rebound tests and no significant differences were found.
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Alsaiari, Hamad Amer, Sujin Yean, Mason B. Tomson, and Amy T. Kan. "Iron Calcium Carbonate: Precipitation Interaction." In SPE International Oilfield Scale Conference. Society of Petroleum Engineers, 2008. http://dx.doi.org/10.2118/114064-ms.

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Paris, Guillaume, Guillaume Caro, Mathieu Dellinger, Itay Halevy, Yigal Barkan, and Joshua West. "Calcium isotope fractionation during (a)biogenic calcium carbonate precipitation." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.6111.

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BIEDERMAN, ERIC, ATHINA BELLONIA, SHADI SHARITNIA, DORRIN JARRAHBASHI, AMIR ASADI, and KYRIAKI KALAITZIDOU. "LIGHTWEIGHT APPROACH TO SMC COMPOSITES: NANOCELLULOSE COATED GLASS FIBER FABRIC." In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36417.

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The focus of this study is to investigate how to lightweight SMC composites for automotive applications without compromising their performance. This is accomplished by replacing, at least partially, the heaviest materials such as the glass fibers (GF) or calcium carbonate (CaCO3) with nanocellulose or nanoclays. In addition, the chopped glass fibers are replaced by glass fabric in order to better control the location and orientation of the glass fiber reinforcement and thus engineer the mechanical properties. Unsaturated polyester resin (UPR) is used as the resin, and a pilot scale sheet molding compounds (SMC) is used to make the SMC. The composites are made by stacking plies of SMC layers in a mold, after appropriate conditioning of the SMC, and compression molding. The properties of interest are the tensile and flexural modulus and strength according to the corresponding ASTM standards and the density of the composites. The void content is also determined using acid digestion and scanning electron microscopy. The main goal is to replace traditional chopped glass fibers (GF) used in SMC with unidirectional glass fabric coated with cellulose nanocrystals (CNC). The reasoning is to enhance properties with a better UPR/GF interface and controlled fiber orientation while reducing density. The glass fiber fabric is coated with nanocellulose using a scalable spraying technique that leads to homogeneous coatings. The four different glass fiber fabrics that were used in this study vary in CNC coating amount. To understand the effect of the nanocellulose, the glass fiber content of all composite formulations was kept constant at about 30 vol%. In addition, to determine the mechanical properties of the composites, the viscosity was verified for all formulations to ensure processability using the SMC pilot line. SEM micrographs show the quality of the CNC coating on the glass fiber fabric. Water uptake of all composites was also determined. The expected results address design, processing, and testing challenges, and successes and failures. The question to be addressed is whether CNC coated fabric is significantly advantageous for SMC compared to randomly oriented, chopped GF.
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Chong, Kai-Yin, Chin-Hua Chia, and Sarani Zakaria. "Polymorphs calcium carbonate on temperature reaction." In THE 2014 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2014 Postgraduate Colloquium. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4895169.

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Vetter, O. J., and W. A. Farone. "Calcium Carbonate Scale in Oilfield Operations." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1987. http://dx.doi.org/10.2118/16908-ms.

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Reports on the topic "Fibre de carbonate de calcium":

1

Willis, Elisha Cade. Review of calcium carbonate incorporated hydrogels. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1441290.

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Vetter, Thomas W. Certification of Standard Reference Material® 915c Calcium Carbonate. Gaithersburg, MD: National Institute of Standards and Technology, 2022. http://dx.doi.org/10.6028/nist.sp.260-223.

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Antoun, Tarabay H., and Donald R. Curran. Wave Propagation in Intact and Jointed Calcium Carbonate (CaCO3) Rock. Fort Belvoir, VA: Defense Technical Information Center, March 1996. http://dx.doi.org/10.21236/ada305457.

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V. J. Fabry. Calcium Carbonate Production by Coccolithophorid Alge in Long Term Carbon Dioxide Sequestration. Office of Scientific and Technical Information (OSTI), September 2006. http://dx.doi.org/10.2172/895624.

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V. J. Fabry. Calcium Carbonate Production by Coccolithophorid Algae in Long Term, Carbon Dioxide Sequestration. Office of Scientific and Technical Information (OSTI), June 2006. http://dx.doi.org/10.2172/895625.

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V.J. Fabry. Calcium Carbonate Production by Coccolithophorid Algae in Long Term, Carbon Dioxide Sequestration. Office of Scientific and Technical Information (OSTI), April 2005. http://dx.doi.org/10.2172/882580.

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V.J. Fabry. Calcium Carbonate Production by Coccolithophorid Algae in Long Term, Carbon Dioxide Sequestration. Office of Scientific and Technical Information (OSTI), July 2004. http://dx.doi.org/10.2172/882582.

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V.J. Fabry. CALCIUM CARBONATE PRODUCTION BY COCCOLITHOPHORID ALGAE IN LONG TERM, CARBON DIOXIDE SEQUESTRATION. Office of Scientific and Technical Information (OSTI), October 2004. http://dx.doi.org/10.2172/836208.

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V. J. Fabry. CALCIUM CARBONATE PRODUCTION BY COCCOLITHOPHORID ALGAE IN LONG TERM, CARBON DIOXIDE SEQUESTRATION. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/838132.

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V. J.Fabry. CALCIUM CARBONATE PRODUCTION BY COCCOLITHAPHORID ALGAE IN LONG TERM, CARBON DIOXIDE SEQUESTRATION. Office of Scientific and Technical Information (OSTI), January 2004. http://dx.doi.org/10.2172/822759.

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