Littérature scientifique sur le sujet « Fiber-shape calcium carbonate »
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Articles de revues sur le sujet "Fiber-shape calcium carbonate"
Wang, Yu Long, Huai Yu Zhan, Yan Xin Liu et Fei Fei Liu. « Analysis of Calcium Sulphate Filler and its Application in Papermaking Process as Functional Filler ». Advanced Materials Research 236-238 (mai 2011) : 1271–76. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1271.
Texte intégralMustoe, George E., et Elizabeth T. Smith. « Timing of Opalization at Lightning Ridge, Australia : New Evidence from Opalized Fossils ». Minerals 13, no 12 (23 novembre 2023) : 1471. http://dx.doi.org/10.3390/min13121471.
Texte intégralJohari, A. N., M. R. Ishak, Z. Leman, M. Z. M. Yusoff et M. R. M. Asyraf. « Creep behaviour monitoring of short-term duration for fiber-glass reinforced composite cross-arms with unsaturated polyester resin samples using conventional analysis ». Journal of Mechanical Engineering and Sciences 14, no 4 (17 décembre 2020) : 7361–68. http://dx.doi.org/10.15282/jmes.14.4.2020.04.0578.
Texte intégralGbadeyan, OJ, S. Adali, G. Bright, B. Sithole et Prabashni Lekha. « Mechanical, microstructure, and dynamic mechanical analysis of nano-shell and plant fiber hybrid biocomposite ». Journal of Composite Materials, 3 mai 2021, 002199832110134. http://dx.doi.org/10.1177/00219983211013418.
Texte intégralVivas, Cesar, et Saeed Salehi. « Screening of Lost Circulation Materials for Geothermal Applications : Experimental Study at High Temperature ». Journal of Energy Resources Technology 144, no 3 (14 décembre 2021). http://dx.doi.org/10.1115/1.4053071.
Texte intégralThèses sur le sujet "Fiber-shape calcium carbonate"
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.
Texte intégralThis 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