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Journal articles on the topic 'Coprecipitation method'

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Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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1

Li, Zeng Xin, Tong Zhu Han, Wen Xia Guo, and Guo Ming Wang. "The Comparison of Different Preparation Methods of Catalysts for Furfural Hydrogenization to 2 - Methyl Furan." Advanced Materials Research 791-793 (September 2013): 68–71. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.68.

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Three different kinds of preparation methods were contrasted and studied to furfural hydrogenation catalyst for 2 - methyl furan production.Cu, Cr-based catalysts are prepared by three different methods, and the differences were also studied in the structure of these catalysts and their catalytic properties on furfural hydrogenation reaction. From the XRD patterns of samples prepared by different methods of Cu-Cr/γ-Al2O3, The results show that: the metal particle size is:the ordinary impregnation method > coprecipitation > solvated metal atom impregnation method. From the SEM photographs by samples, distribution uniformity of the catalyst ion surface: ordinary impregnation method > coprecipitation > solvated metal atom impregnation method. The reduction degree of the metal: solvated metal atom impregnation ordinary impregnation coprecipitation method. Furfural hydrogenation experimental results show that the order of catalytic activity is solvated metal atom > general impregnation coprecipitation; the selectivity order of 2 - methyl furan: coprecipitation> ordinary impregnation method solvated metal atom impregnation method.
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2

Pishch, I. V., O. N. Chudnovskaya, E. N. Putilina, and N. N. Shabanova. "Obtaining pigments by the coprecipitation method." Glass and Ceramics 50, no. 3 (March 1993): 134–36. http://dx.doi.org/10.1007/bf00678624.

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3

Hoshi, Kazushi, Hiroki Kato, Takayuki Fukunaga, Shinichi Furusawa, and Hiroshi Sakurai. "Synthesis of MnZn-Ferrite Using Coprecipitation Method." Key Engineering Materials 534 (January 2013): 22–25. http://dx.doi.org/10.4028/www.scientific.net/kem.534.22.

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Mn1-xZnxFe2O4(x= 0, 0.1, 0.2, 0.3, 0.4, 0.5) are synthesized using sintering coprecipitation method. The coprecipitation retains from 0 hours to 48 hours at 1200 °C. The synthesis of a Mn0.6Zn0.4Fe2O4is almost completed even though retaining time is for 0 hours at 1200 °C. The crystal growth of Mn0.6Zn0.4Fe2O4particles proceeds rapidly retaining up to 6 hours and saturates retaining more than 6 hours at 1200 °C. The permeability and the electric resistivity are affected by the crystal growth of Mn0.6Zn0.4Fe2O4particles.
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4

Wu, Jun Hua, Seung Pil Ko, Hong Ling Liu, Myung-Hwa Jung, Ju Hun Lee, Jae-Seon Ju, and Young Keun Kim. "Sub 5nm Fe3O4 nanocrystals via coprecipitation method." Colloids and Surfaces A: Physicochemical and Engineering Aspects 313-314 (February 2008): 268–72. http://dx.doi.org/10.1016/j.colsurfa.2007.04.108.

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5

Li, Jie, Xiaofei Liu, Wangcheng Zhan, Yun Guo, Yanglong Guo, and Guanzhong Lu. "Preparation of high oxygen storage capacity and thermally stable ceria–zirconia solid solution." Catalysis Science & Technology 6, no. 3 (2016): 897–907. http://dx.doi.org/10.1039/c5cy01571e.

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Ce0.5Zr0.5O2 prepared by the complexing–coprecipitation method (CZ-2) exhibits higher oxygen storage capacity (OSC) and thermal stability than that prepared by coprecipitation (CZ-1) or the complexing–coprecipitation-solution (CZ-3) method. After being aged at 1100 °C for 6 h, CZ-2a exhibited the highest OSC and catalytic activity.
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6

Zhang, Li Fang, Cui Zhi Dong, Hui Fang Zhang, and Jing Long Bu. "Performance Study of ZrO2-Al2TiO5 Composite Prepared by Solid Phase and Coprecipitation Method." Advanced Materials Research 415-417 (December 2011): 764–67. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.764.

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ZrO2-Al2TiO5 composites were finally prepared with synthetic powders by coprecipitation or solid method phase.we compared with their properties. The results show that the sintering properties and thermal shock resistance of ZrO2-Al2TiO5 composites prepared by coprecipitation method are superior to solid phase method.
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7

Ahn, Ho-Geun, Byoung-Min Choi, and Do-Jin Lee. "Complete Oxidation of Ethylene over Supported Gold Nanoparticle Catalysts." Journal of Nanoscience and Nanotechnology 6, no. 11 (November 1, 2006): 3599–603. http://dx.doi.org/10.1166/jnn.2006.17990.

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Complete oxidation of ethylene was performed over supported noble metals or transition metals oxide catalysts and on monoliths under atmospheric pressure. Gold nanoparticles on Al2O3 or MxOy (M = Mo, Fe, Mn) were prepared by impregnation, coprecipitation, deposition, and dispersion methods. Nanoparticles prepared by impregnation method were irregular and very large above 25 nm, but those by coprecipitation and deposition method were uniformly nanosized at 4 ∼ 5 nm. The gold nanoparticle were outstandingly active in catalyzing oxidation of ethylene. The activity order of these catalysts with preparation methods was deposition > coprecipitation > impregnation, and Au/Co3O4 prepared by deposition method showed the best performance in ethylene oxidation. The addition of gold particles to MxOy/Al2O3 catalyst enhanced the ethylene oxidation activity significantly. The main role of the gold nanoparticles apparently was to promote dissociative adsorption of oxygen and to enhance the reoxidation of the catalyst.
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8

Ciobanu, Carmen, Cristina Popa, and Daniela Predoi. "Cerium doped hydroxyapatite nanoparticles synthesized by coprecipitation method." Journal of the Serbian Chemical Society 81, no. 4 (2016): 433–46. http://dx.doi.org/10.2298/jsc150824007c.

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The present work reports a simple coprecipitation adapted method for the synthesis of stable Ce substituted to Ca hydroxyapatite (HAp) nanoparticles. The structural and morphological properties of Ce doped hydroxyapatite (Ce:HAp) were characterized by X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray analysis (EDAX). The optical properties of Ce doped hydroxyapatite were also investigated using Fourier Transform Infrared (FTIR) spectroscopy, FT Raman spectroscopy and photoluminescence analysis. The results of the XRD studies revealed the progressive increase in the a- and c-axes with increasing of Ce concentrations. In the FTIR studies of Ce:HAp powders a similar structure to hydroxyapatite was observed. IR and Raman wavenumbers and the peak strength of the bands associated to the P-O and O-H bonds decreases progressively with the increase of Ce concentration. All the emission maxima could be attributed to the 5d-4f transitions of Ce ions. The displacement of maximum emission bands with the increase of Cerium in the samples is in agreement with the results obtained by XRD studies. The Ce:HAp samples with xCe =0.03 and 0.05 exhibited significant antibacterial activity against Staphylococcus aureus ATCC 6538 and E. coli 714 bacterial strains compared to Ce:HAp samples with xCe =0 (pure HAp) and 0.01.
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9

UEHARA, Motoki, Koichiro TAKAHASHI, Toru ASAKA, and Sadao TSUTSUMI. "Preparation of (La1-xSrx)MnO3 by Coprecipitation Method." Journal of the Ceramic Society of Japan 106, no. 1240 (1998): 1248–51. http://dx.doi.org/10.2109/jcersj.106.1248.

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10

Murugan, A. Vadivel, Violet Samuel, S. C. Navale, and V. Ravi. "Phase evolution of NiTiO3 prepared by coprecipitation method." Materials Letters 60, no. 15 (July 2006): 1791–92. http://dx.doi.org/10.1016/j.matlet.2005.12.023.

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11

Ahn, Taebin, Jong Hun Kim, Hee-Man Yang, Jeong Woo Lee, and Jong-Duk Kim. "Formation Pathways of Magnetite Nanoparticles by Coprecipitation Method." Journal of Physical Chemistry C 116, no. 10 (March 2, 2012): 6069–76. http://dx.doi.org/10.1021/jp211843g.

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12

Hamao, Naoki, and Junji Akimoto. "Synthesis of Garnet-type Li7La3Zr2O12 by Coprecipitation Method." Chemistry Letters 44, no. 7 (July 5, 2015): 970–72. http://dx.doi.org/10.1246/cl.150295.

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13

Ryu, Beyong-Hwan, Hyun-Ju Chang, Young-Min Choi, Ki-Jeong Kong, Jeong-O. Lee, Chang Gyoun Kim, Ha-Kyun Jung, and Jong-Hoon Byun. "Preparation of Co1?xNixFe2O4 nanoparticles by coprecipitation method." physica status solidi (a) 201, no. 8 (June 2004): 1855–58. http://dx.doi.org/10.1002/pssa.200304669.

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14

Pramanik, P., S. Biswas, C. Singh, D. Bhattacharya, T. K. Dey, D. Sen, S. K. Ghatak, and K. L. Chopra. "Coprecipitation method for preparation of superconducting YBa2Cu3Ox compounds." Materials Research Bulletin 23, no. 12 (December 1988): 1693–98. http://dx.doi.org/10.1016/0025-5408(88)90177-8.

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15

Salavati-Niasari, Masoud, Tahmineh Mahmoudi, and Omid Amiri. "Easy Synthesis of Magnetite Nanocrystals via Coprecipitation Method." Journal of Cluster Science 23, no. 2 (March 6, 2012): 597–602. http://dx.doi.org/10.1007/s10876-012-0451-5.

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16

Kim, Kyung Nam, Ha-Kyun Jung, Hee Dong Park, and Dojin Kim. "Synthesis and characterization of red phosphor (Y,Gd)BO3:Eu by the coprecipitation method." Journal of Materials Research 17, no. 4 (April 2002): 907–10. http://dx.doi.org/10.1557/jmr.2002.0132.

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The synthesis and luminescent properties of (Y,Gd)BO3:Eu phosphor were investigated. A coprecipitation method was designed for preparing Eu doped (Y,Gd)BO3. This method features a low-temperature formation of single phase with semi-spherical shape compared with the conventional method. Due to the homogeneous distribution of activator, the emission intensity of the (Y,Gd)BO3:Eu phosphor prepared by the coprecipitation method is higher than the commercially available red phosphor.
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17

Hu, Yun Feng, Guang Shen Jiang, Jun Cai, Jun Sheng Liu, and Jun Deng. "Dehydrogenation of Sec-Butanol to Methyl Ethyl Ketone over Cu-ZnO Catalysts Prepared by Different Methods: Coprecipitation and Physical Mixing." Advanced Materials Research 750-752 (August 2013): 1778–81. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.1778.

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Cu-ZnO catalysts prepared by coprecipitation and physical mixing methods were characterized to investigate the roles of ZnO by X-ray diffraction (XRD), N2O chemisorption decomposition and evaluated for the vapor-phase dehydrogenation of sec-butanol (SBA) to methyl ethyl ketone (MEK). ZnO not only could disperse Cu species, but also prevent Cu0from sintering. Cu-ZnO catalyst by coprecipitation method exhibited excellent reactivity.
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18

Maranhão, Willian C. A., Rodrigo U. Ichikawa, X. Turrillas, Walter Kenji Yoshito, Margarida Juri Saeki, Marcos Tadeu D'azeredo Orlando, and Luís Gallego Martinez. "Characterization of Nanostructured Mn-Zn Ferrites Synthesized by Coprecipitation Method Using CTAB." Materials Science Forum 1012 (October 2020): 207–11. http://dx.doi.org/10.4028/www.scientific.net/msf.1012.207.

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In this work it was investigated the influence of CTAB surfactant concentration on the synthesis of the compound Mn0.75Zn0.25Fe2O4 by the coprecipitation method. It was also compared the influence of hydrothermal treatment on the synthesized materials. The magnetic properties were characterized by AC susceptometry for the determination of the magnetic susceptibility and magnetic density energy. The phases, crystal structure and morphology of the nanoferrites were determined by Rietveld analysis of X-ray diffraction data. It was found the presence of two phases: Franklinite and Akaganeite and it was shown that the samples synthesized only by coprecipitation presented the tendency to increasing the crystallite sizes of the akaganeite phase and decreasing of crystallite sizes of the Franklinite phase as a function of CTAB concentration. The samples submitted to subsequent hydrothermal treatment presented a tendency to decreasing the crystallite sizes of both phases and increasing in Franklinite phase fraction, compared to the samples synthesized only by coprecipitation, suggesting that the hydrothermal treatment was effective in obtaining nanostructured materials of smaller particles.
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19

Murti, Cahyaning Fajar Kresna, Malik Anjelh Baqiya, Endarko, and Triwikantoro. "Particle Size Analysis of the Synthesized Al2O3 by Dissolution and Alkali Fusion-Coprecipitation Methods." Key Engineering Materials 860 (August 2020): 128–34. http://dx.doi.org/10.4028/www.scientific.net/kem.860.128.

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Particle size analysis of synthesized Al2O3 by dissolution and alkali fusion-coprecipitation methods has been conducted. The formation of nano- or microparticles can be synthesized by the top-down (physically) and bottom-up (chemically) methods. In this study, the commercial alumina (Merck) with the particle size of 63 µm was synthesized through the bottom-up method. The dissolution method was done by reacting to alumina with ammonium hydroxide (NH4OH). The alkali fusion method was carried out by reacting alumina with sodium hydroxide (NaOH) and it obtained by coprecipitation of the alkali fusion product with HCl and NH4OH. The result from both methods were calcined at 600°C. The phase of synthesized Al2O3 was identified by using X-ray diffraction (XRD), whereas the morphology observed using a transmission electron microscope (TEM), and the particle sizes measured by particle sizes analyzer (PSA). The XRD pattern shows the γ-Al2O3 phases with particle sizes of ~33 nm and ~25 nm from TEM observations, while the PSA results revealed agglomerated particles with particle sizes of 1263 nm and 477 nm for the dissolution and alkali fusion-coprecipitation method, respectively. Therefore, both methods can be used to reduce the particle size of γ-Al2O3.
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20

Deng, Chenhua, Linjie Hou, and Caifeng Zhang. "Eco-Friendly Ferrimagnetic-Humic Acid Nanocomposites as Superior Magnetic Adsorbents." Materials 14, no. 18 (September 7, 2021): 5125. http://dx.doi.org/10.3390/ma14185125.

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Recyclable, cheap, eco-friendly, and efficient adsorbent materials are very important for the removal of pollution. In this work, we report the design and implementation of ferrimagnetic-humic acid nanocomposites as superior magnetic adsorbent for heavy metals. Ferrimagnetic and ferrimagnetic-humic acid nanocomposite particles with different morphologies were prepared using the coprecipitation method and hydrothermal synthesis method, respectively. The results show that the morphology of the nanoparticles prepared by the coprecipitation method is more uniform and the size is smaller than that by the hydrothermal synthesis method. Adsorption experiments show that the ferrimagnetic-humic acid nanoparticles prepared by the coprecipitation method has high sorption capacity for cadmium, and the maximum adsorption capacity is about 763 μg/g. At the same time, magnetic technology can be used to realize the recycling of ferrimagnetic-humic acid adsorbents.
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21

Zhou, Guilin, Hai Lan, Ruyi Song, Hongmei Xie, and Qinxiang Du. "Effects of preparation method on CeCu oxide catalyst performance." RSC Adv. 4, no. 92 (2014): 50840–50. http://dx.doi.org/10.1039/c4ra05431h.

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CeCu-HT, CeCu-PC, and CeCu-CA composite oxide catalysts were synthesized using hard-template, coprecipitation, and complex methods, respectively, and characterized by XRD, TEM, BET, XPS, and H2-TPR.
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22

Suprapto, Suprapto, Tikha Reskiani Fauziah, Meiske S. Sangi, Titie Prapti Oetami, Imroatul Qoniah, and Didik Prasetyoko. "Calcium Oxide from Limestone as Solid Base Catalyst in Transesterification of Reutealis trisperma Oil." Indonesian Journal of Chemistry 16, no. 2 (March 13, 2018): 208. http://dx.doi.org/10.22146/ijc.21165.

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CaO catalysts were synthesized from limestone by thermal decomposition and coprecipitation methods. The CaO and MgO reference catalysts were also synthesized for comparison. The catalysts were characterized by X-ray diffractometer (XRD) and the analysis result was refined by Rietica software. CaO catalyst obtained by coprecipitation method has higher purity of CaO and lower MgO content than those of calcined CaO. The catalysts were also characterized by Fourier Transform Infrared (FTIR) spectroscopy. FTIR spectra showed that the catalysts can be easily hydrated and carbonated in air. The catalytic activity of the catalyst was studied in transesterification reaction of Reutealis trisperma (Kemiri Sunan) oil with methanol. Transesterification reaction was carried out at oil to methanol molar ratio 1:1 and 1% of catalyst at 60 °C for 2 h. Catalytic activity of CaO catalyst obtained by coprecipitation was higher than calcined CaO. The methyl ester yield obtained from synthesized CaO, CaO from coprecipitation, calcined CaO, and synthesized MgO catalysts were 56.13; 37.74; 15.97; and 3.61%, respectively.
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23

Sunarya, Yurikke Julieta Permata Putri, Yuni Kustiar, Nancy Siti Djenar, and Ayu Ratna Permanasari. "Pengaruh Metode Hidrolisis Terhadap Karakteristik Kimia Senyawa Kalsium Hasil Ekstraksi dari Cangkang Telur Ayam." KOVALEN: Jurnal Riset Kimia 8, no. 1 (April 29, 2022): 25–31. http://dx.doi.org/10.22487/kovalen.2022.v8.i1.15803.

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Preparation of calcium compounds such as calcium hydroxide, calcium carbonate, and calcium oxide from chicken eggshells can be done through conventional methods that are cheaper and more practical, such as the sol-gel hydrolysis method and the coprecipitation method. In this study, the synthesis of calcium compounds from domestic chicken eggshells was carried out using two methods: the coprecipitation method and sol-gel method. Coprecipitation method consists of acid hydrolysis and alkaline hydrolysis. Sol-gel method consists of modification I and modification II. The AAS results showed that the calcium content from the hydrolysis of acids, alkaline, sol-gel modification I, and sol-gel modification II: 14.50%, 6.64%, 6.68%, and 9.93%, respectively. The FTIR showed that calcium compounds have four characteristic absorption bands, including O–H (3641.60 and 3448.72 cm-1) derived from Ca(OH)2 and H2O products, C=O (2981.95 - 1799 cm-1), and C–O (1448.54 – 874.68 cm-1) both of which from carbonate ions (CO3-) in CaCO3 both from eggshell and from the resulting calcium compounds, and Ca-O (711.73 cm-1) derived from CaO products. The results showed that the modification ll sol-gel method was the best because calcium compounds consisting of CaCO3, Ca(OH)2, and CaO were produced in a smooth texture, white color, and with the highest calcium content compared to other methods.
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24

Sanchez-Martinez, A., J. P. Ortiz-Beas, A. M. Huerta-Flores, Edgar R. López-Mena, J. Pérez-Álvarez, and O. Ceballos-Sanchez. "ZnSe nanoparticles prepared by coprecipitation method for photocatalytic applications." Materials Letters 282 (January 2021): 128702. http://dx.doi.org/10.1016/j.matlet.2020.128702.

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25

Zou, Jian Peng. "Sintering Kinetics of Hydroxyapatite Prepared by Chemical Coprecipitation Method." Advanced Materials Research 233-235 (May 2011): 1511–15. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.1511.

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With chemical coprecipitation method, high purity hydroxyapatite was successfully prepared in this paper. The microstructure and components of HA were characterized by XRD, SEM, FTIR, atomic emission spectrum and particle size analyzer. The results demonstrate that synthesized HA is very pure and is harmless to human body. Average particle size of HA powder is about 10.4μm. Crystallization degree of hydroxyapatite increases with the increase of sintering temperature and the optimal preparing technique is sintering at 750 for 2h with temperature-rising rate of 5°C·min-1. Grain growing activation energy of HA can be calculated as 24.8 kJ·mol-1 according to the relationship between grain size and sintering temperature. HA’s grain growth mechanism is interfacial diffusion controlling mechanism.
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26

Uehara, Motoki, Takuro Nagai, Atsushi Yamazaki, Koichiro Takahashi, and Sadao Tsutsumi. "Preparation of Non-Stoichiometric Nd1−xMnO3−yby Coprecipitation Method." Chemistry Letters 28, no. 6 (June 1999): 463–64. http://dx.doi.org/10.1246/cl.1999.463.

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27

Revathy, M. S., R. Suman, Naidu Dhanpal Jayram, D. Geetha, and T. Chitravel. "Multifarious properties of Bunsenite nanosphere NiO using coprecipitation method." Materials Today: Proceedings 33 (2020): 1165–74. http://dx.doi.org/10.1016/j.matpr.2020.07.411.

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28

Gaikwad, S. P., S. B. Dhesphande, Y. B. Khollam, Violet Samuel, and V. Ravi. "Coprecipitation method for the preparation of nanocrystalline ferroelectric CaBi2Ta2O9." Materials Letters 58, no. 27-28 (November 2004): 3474–76. http://dx.doi.org/10.1016/j.matlet.2004.07.004.

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29

Ding, Zhanlai, Cunran An, Qiang Li, Zhezhe Hou, Jianqiang Wang, Haibo Qi, and Fangjuan Qi. "Preparation of ITO Nanoparticles by Liquid Phase Coprecipitation Method." Journal of Nanomaterials 2010 (2010): 1–5. http://dx.doi.org/10.1155/2010/543601.

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The nanoscale indium tin oxide (ITO) particles are synthesied by liquid phase coprecipitation method under given conditions with solution of indium chloride, tin chloride, and ammonia. The absolute ethyl alcohol or deionized water was used as solvent and the dodecylamine or hexadecylamine surfactant was used as a dispersant in the reaction system. The sample powder was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution electron microscopy (HRTEM). Based on the transmission electron micrograph, the influences of the two different solvents and the two different dispersants on the nanoparticle size and dispersion were studied, respectively. The results showed that the ITO particles are finely crystallized body-centered cubic structure. The particle size has distributed in 30 nm to 90 nm.
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30

Watanabe, A., H. Haneda, Y. Moriyoshi, S. Shirasaki, S. Kuramoto, and H. Yamamura. "Preparation of lead magnesium niobate by a coprecipitation method." Journal of Materials Science 27, no. 5 (1992): 1245–49. http://dx.doi.org/10.1007/bf01142031.

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31

Li, G., T. Q. Yang, J. F. Wang, S. C. Chen, and X. Yao. "Preparation of PLZST antiferroelectric ceramics by hydroxide coprecipitation method." Ceramics International 39 (May 2013): S345—S348. http://dx.doi.org/10.1016/j.ceramint.2012.10.091.

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32

Pishch, I. V., T. L. Zalevskaya, E. N. Putilina, and L. N. Vetoshka. "Synthesis of pigments according to the method of coprecipitation." Glass and Ceramics 49, no. 3 (March 1992): 138–40. http://dx.doi.org/10.1007/bf00676962.

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33

Hamao, Naoki, and Junji Akimoto. "ChemInform Abstract: Synthesis of Garnet-Type Li7La3Zr2O12by Coprecipitation Method." ChemInform 46, no. 47 (November 2015): no. http://dx.doi.org/10.1002/chin.201547013.

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34

Lin, Xiao Yan, Xu Dong Li, Hong Song Fan, Yu Mei Xiao, Jian Lu, and Xing Dong Zhang. "Comparative Investigation of Coprecipitation and In-Situ Synthesis of Nanohydroxyapatite/Collagen Composite." Key Engineering Materials 284-286 (April 2005): 839–42. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.839.

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Hydroxyapatite/collagen (HA/COL) composites were prepared using coprecipitation and in-situ synthesis methods. All these processes yielded nanosize poorly crystallized hydroxyapatite/collagen composites. The low temperature in situ formed composites showed some features of natural bone in phase composition, crystal size and crystallinity. Compare with the composite prepared by coprecipitation synthesis, the composite resulted from a low temperature in situ synthesis method showed better homogeneity and mechanical properties. It is confirmed that the low temperature in situ synthesis method was an effective way to obtain biomimetic nanoHA/COL composites with good homogeneity and mechanical properties.
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35

Li, Ming Wei, Cui Ping Liu, and Xiao Mei Gao. "Nickel Ferrite Nanocrystallites Synthesized by Sol-Gel and Coprecipitation Methods: A Comparative Study." Advanced Materials Research 79-82 (August 2009): 305–8. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.305.

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The microstructures and magnetic properties of nickel ferrite synthesized by coprecipitation and sol–gel methods are comparatively studied. The coprecipitation-derived samples have Fe/Ni ratios differing from their raw materials because of the precipitation washing process. The stoichiometric metal cations (Fe/Ni=2.0) in the xerogel facilitated the nucleation and growth of nickel ferrite nanocrystallites at lower calcination temperature in sol–gel method. The samples consist of nickel ferrite nanocrystallites, and have superparamagnetic properties at room temperature.
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36

Hong, Sunghoon, Sujeong Heo, Wooram Kim, Young Jo, Young-Kwon Park, and Jong-Ki Jeon. "Catalytic Decomposition of an Energetic Ionic Liquid Solution over Hexaaluminate Catalysts." Catalysts 9, no. 1 (January 14, 2019): 80. http://dx.doi.org/10.3390/catal9010080.

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The objective of this study was to determine the effect of a synthesis procedure of Sr hexaaluminate on catalytic performance during the decomposition of ionic liquid monopropellants based on ammonium dinitramide (ADN) and hydroxyl ammonium nitrate (HAN). Sr hexaaluminates were prepared via both coprecipitation and a sol–gel process. The surface area of hexaaluminate synthesized via the coprecipitation method was higher than that of hexaaluminate synthesized by the sol–gel process, and calcined at the same temperature of 1200 °C or more. This is because of the sintering of α-Al2O3 on the hexaaluminate synthesized via the sol–gel process, which could not be observed on the catalysts synthesized via the coprecipitation method. The hexaaluminate synthesized via coprecipitation showed a lower decomposition onset temperature during the decomposition of ADN- and HAN-based liquid monopropellants in comparison with the catalysts synthesized via the sol–gel process, and calcined at the same temperature of 1200 °C or more. This is attributed to the differences in the Mn3+ concentration and the surface area between the two hexaaluminates. Consequently, the hexaaluminate synthesized via coprecipitation which calcined above 1200 °C showed high activity during the decomposition of energetic ionic liquid monopropellants compared with the hexaaluminate synthesized via the sol–gel process.
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37

De Guire, M. R., S. E. Dorris, R. B. Poeppel, S. Morissette, and U. Balachandran. "Coprecipitation synthesis of doped lanthanum chromite." Journal of Materials Research 8, no. 9 (September 1993): 2327–35. http://dx.doi.org/10.1557/jmr.1993.2327.

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Two coprecipitation methods were used to synthesize powder precursors of doped lanthanum chromite (La, Ca)(Cr, Co)O3. The effects of synthesis method and calcination temperature on the composition, sintered density, and microstructure of pressed compacts of (La, Ca)(Cr, Co)O3 were studied by differential thermal analysis/thermogravimetric analysis, x-ray diffraction, scanning electron microscopy, and density measurement. The cation ratios in the precipitated solids were, with few exceptions, within experimental error of the desired compositions for all four components. Powders obtained by both techniques could be sintered to densities exceeding 93% at 1400 °C. The highest densities were obtained with calcining temperatures from 450 to 700 °C. The sintered microstructures exhibited uniform grain sizes averaging 3–5 μm. The Cr(vi) compounds, CaCrO4 and La2CrO6, were observed in all of the calcined powders. The possible role of these phases on chromite densification is discussed.
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Mallampati, Ramakrishna, and Suresh Valiyaveettil. "Co-precipitation with calcium carbonate – a fast and nontoxic method for removal of nanopollutants from water?" RSC Advances 5, no. 15 (2015): 11023–28. http://dx.doi.org/10.1039/c4ra14292f.

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39

Wibisono, Yusuf, Alien Yala Pratiwi, Christine Ayu Octaviani, Cut Rifda Fadilla, Alfian Noviyanto, Epi Taufik, Muhammad K. H. Uddin, Fajri Anugroho, and Nurul Taufiqu Rochman. "Marine-Derived Biowaste Conversion into Bioceramic Membrane Materials: Contrasting of Hydroxyapatite Synthesis Methods." Molecules 26, no. 21 (October 20, 2021): 6344. http://dx.doi.org/10.3390/molecules26216344.

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Marine-derived biowaste increment is enormous, yet could be converted into valuable biomaterial, e.g., hydroxyapatite-based bioceramic. Bioceramic material possesses superiority in terms of thermal, chemical, and mechanical properties. Bioceramic material also has a high level of biocompatibility when projected into biological tissues. Tuning the porosity of bioceramic material could also provide benefits for bioseparation application, i.e., ultrafiltration ceramic membrane filtration for food and dairy separation processes. This work presents the investigation of hydroxyapatite conversion from crab-shells marine-based biowaste, by comparing three different methods, i.e., microwave, coprecipitation, and sol–gel. The dried crab-shells were milled and calcinated as calcium precursor, then synthesized into hydroxyapatite with the addition of phosphates precursors via microwave, coprecipitation, or sol–gel. The compound and elemental analysis, degree of crystallinity, and particle shape were compared. The chemical compounds and elements from three different methods were similar, yet the degree of crystallinity was different. Higher Ca/P ratio offer benefit in producing a bioceramic ultrafiltration membrane, due to low sintering temperature. The hydroxyapatite from coprecipitation and sol–gel methods showed a significant degree of crystallinity compared with that of the microwave route. However, due to the presence of Fe and Sr impurities, the secondary phase of Ca9FeH(PO4)7 was found in the sol–gel method. The secondary phase compound has high absorbance capacity, an advantage for bioceramic ultrafiltration membranes. Furthermore, the sol–gel method could produce a snake-like shape, compared to the oval shape of the coprecipitation route, another benefit to fabricate porous bioceramic for a membrane filter.
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Zhang, Shuaibo, Haixia Li, Anchao Zhang, Zhijun Sun, Xinmin Zhang, Changze Yang, Leying Jin, and Zhiheng Song. "Selective catalytic reduction of NOx by low-temperature NH3 over MnxZr1 mixed-oxide catalysts." RSC Advances 12, no. 3 (2022): 1341–51. http://dx.doi.org/10.1039/d1ra08800a.

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41

Li Fa-Shen, Wang Tao, and Wang Ying. "Method for fabricating Fe3O4 nanoparticles using H2O2 and its comparison with coprecipitation method." Acta Physica Sinica 54, no. 7 (2005): 3100. http://dx.doi.org/10.7498/aps.54.3100.

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42

Kume, Hideki, Yoshito Nishikawa, Díaz De la Torre Sebastián, Suguru Inamura, Hiroki Miyamoto, Taizo Kato, and Takeshi Maeda. "Fabrication of Alumina-5mass%YAG Composites by the Coprecipitation Method." Journal of the Japan Society of Powder and Powder Metallurgy 48, no. 4 (2001): 341–44. http://dx.doi.org/10.2497/jjspm.48.341.

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43

Li, Hong Ya, Tian Tian Zhang, and Biao Yan. "The Catalytic Properties of Copper Catalysts Prepared by Coprecipitation Method." Advanced Materials Research 997 (August 2014): 858–61. http://dx.doi.org/10.4028/www.scientific.net/amr.997.858.

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A series of copper catalysts were prepared by coprecipitation method and used for treating the Acid Red B wastewater with catalytic wet air oxidation method. Various parameters which influence the activity the catalyst in the process were optimized. Results showed that when (NH4)2CO3 was used as precipitating agent, and the concentration was 0.8mol / L, precipitation temperature was 40 °C, calcination temperature was 600 °C, the copper catalysts prepared by direct addition method showed better activity in treating the wastewater.
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Silva, Viviane V., Fernando Soares Lameiras, and Rosana Z. Domingues. "Evaluation of Stoichiometry of Hydroxyapatite Powders Prepared by Coprecipitation Method." Key Engineering Materials 189-191 (February 2001): 79–84. http://dx.doi.org/10.4028/www.scientific.net/kem.189-191.79.

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45

Jung, Goo Eun, and Jae Gui Koh. "Preparation and Properties of Ni-Zn Ferrite by Coprecipitation Method." Korean Journal of Materials Research 14, no. 5 (May 1, 2004): 338–42. http://dx.doi.org/10.3740/mrsk.2004.14.5.338.

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46

Ataie, Abolghasem, and S. Moslemi. "Nano Crystalline La Substituted Barium Hexaferrite Synthesized by Coprecipitation Method." Advanced Materials Research 264-265 (June 2011): 795–800. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.795.

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La substituted barium hexaferrite Ba1-yFe12LayO19 with 0≤ y ≤0.5 was synthesized by chemical co-precipitation method using aqueous solutions of metallic chlorides at ambient temperature. NaOH was used as a precipitant. The co-precipitated products were annealed at 900 and 1000°C. The effects of La addition on the phase composition, morphology and thermal behavior of samples were studied using XRD, SEM and DTA/TGA, respectively. XRD results indicated that barium hexaferrite forms together with some intermediate phases in samples annealed at 900°C and the amount of intermediate phases decreased significantly by increasing annealing temperature to 1000°C. XRD results also showed that in sample annealed at 1000°C, the crystallite size of magnetic phase decreases from 98 to 64 nm by increasing the amount of La. Thermal analysis (DTA/TGA) implies that formation temperature of barium hexaferrite is increased with addition of La.
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47

Nguyen, Tien Anh, and Dat Tien Nguyen. "Synthesis of nanosized magnetic NiFe2O4 material by a coprecipitation method." Science and Technology Development Journal 19, no. 4 (December 31, 2016): 137–43. http://dx.doi.org/10.32508/stdj.v19i4.710.

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Nanosized NiFe2O4 spinel material has been synthesized by the coprecipitation method by hydrolysis of Ni(II) and Fe (III) cations in boiling water. The DTA/TGA, XRD, SEM, TEM, VSM results showed that NiFe2O4 crystals formed after calcinating at 700 oC for 2 h exhibited the cubic structure, with the size of 30-50 nM. Mr, Ms and Hc values were 1.06 emu/g, 14.94 emu/g and 61.57 Oe, respectively. The crystal size significantly increased with increasing calcination temperature.
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48

Maček, Jadran, and Marjan Marinšek. "Formation of nickel and zirconia nanocomposites by the coprecipitation method." Nanostructured Materials 12, no. 1-4 (January 1999): 499–502. http://dx.doi.org/10.1016/s0965-9773(99)00168-3.

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HAYASHI, Shigeo, Kiyoshi OKADA, and Nozomu OTSUKA. "Preparation of CaSiO3 Powders by Coprecipitation Method and Their Sinterability." Journal of the Ceramic Society of Japan 99, no. 1156 (1991): 1224–27. http://dx.doi.org/10.2109/jcersj.99.1224.

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Xiang, Ping-Hua, Yoshiaki Kinemuchi, Takaaki Nagaoka, and Koji Watari. "Sintering behaviors of bismuth titanate synthesized by a coprecipitation method." Materials Letters 59, no. 28 (December 2005): 3590–94. http://dx.doi.org/10.1016/j.matlet.2005.07.002.

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