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Artículos de revistas sobre el tema "Alkaline hydrothermal synthesis"

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Publicado: 4 de junio de 2021
Última modificación: 4 de febrero de 2022

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1

Hartati, Hartati, Satya Candra Wibawa Sakti, Putri Bintang Dea Firda, and Chabibah Saidah. "Optimization of Pretreatment and Hydrothermal Process of Na-X Zeolite from Kaolin and Metakaolin." Jurnal Kimia Valensi 5, no. 2 (2019): 202–10. http://dx.doi.org/10.15408/jkv.v5i2.11326.

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Synthesis of Na-X zeolite was conducted from kaolin and metakaolin. Synthesis varied in its pretreatment method and hydrothermal conditions. The pretreatment methods used were: conventional alkaline, alkaline fusion and conventional fluoride. Hydrothermal conditions for the experiments were gradual temperature 40 oC (6h), 60 oC (6h), 80 oC (12h), and constant temperature 80 oC for 24 h, 100 oC for 24 and 100 oC for 48 h. Synthesized products were characterized by X-Ray Diffraction (XRD), Fourier Transform InfraRed (FTIR), Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX), and N2 I
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2

Erdural, Beril K., Alp Yurum, Ufuk Bakir, and Gurkan Karakas. "Hydrothermal Synthesis of Nanostructured TiO2 Particles and Characterization of Their Photocatalytic Antimicrobial Activity." Journal of Nanoscience and Nanotechnology 8, no. 2 (2008): 878–86. http://dx.doi.org/10.1166/jnn.2008.c267.

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Nanostructured titania particles were synthesized by using hydrothermal processing and the photocatalytic antimicrobial activities were characterized. Both sol–gel synthesized and commercial TiO2 (anatase) samples were processed with two step hydrothermal treatments, under alkaline and neutral conditions. Scanning Electron Microscope (SEM) images showed that alkaline treatment yields nanofibers and lamellar structured particles from the commercial anatase and sol–gel synthesized samples respectively. Further treatment of nanofibers and nanostructured lamellar particles with distilled water res
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3

Yamasaki, Nakamichi, Kazunori Yokosawa, Sergiy Korablov, and Kazuyuki Tohjt. "Synthesis of Diamond Particles under Alkaline Hydrothermal Conditions." Solid State Phenomena 114 (July 2006): 271–76. http://dx.doi.org/10.4028/www.scientific.net/ssp.114.271.

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Very fine diamond powder (1-3 ~m) was readily sintered under hydrothermal conditions, with new bond formation occurring between the diamond particles in a l0M-NaOH solution at 573 K maintained at 1 GPa pressure, for 24 hours. This new bonding material can be formed by carbonization, from a chlorinated hydrocarbon such as dichloromethane and 1, 1,1–trichloroethane. The carbonized material forms a new bond between the hydrogenated diamond particles by the release of hydrogen chloride. Using Raman spectroscopy and hydrogenated cubic boron nitride substrates it was indisputably demonstrated that d
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4

Michailovski, Alexej, Michael Wörle, Denis Sheptyakov, and Greta R. Patzke. "Hydrothermal synthesis of anisotropic alkali and alkaline earth vanadates." Journal of Materials Research 22, no. 1 (2007): 5–18. http://dx.doi.org/10.1557/jmr.2007.0002.

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In the course of a systematic field study, anisotropic alkali and alkaline earth vanadates have been accessed through a straightforward, one-step hydrothermal process. They are formed quantitatively from V2O5 and alkali- or alkaline earth halide solutions after a few days of autoclave treatment in the temperature range between 100 and 220 °C. The presence of ionic additives leads to an interplay between the formation of isotropic crystalline phases and the production of fibrous oxide materials, such as a novel magnesium vanadate. The influence of the hydrothermal parameters and of the alkali/a
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5

Ariyanti, Dessy, Satriani Mo’ungatonga, and Wei Gao. "Enhanced adsorption property of TiO2 based nanoribbons produced by alkaline hydrothermal process." METANA 16, no. 2 (2020): 61–67. http://dx.doi.org/10.14710/metana.v16i2.33428.

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TiO2 is a semiconductor material with endless potential for the development of renewable energy as well as in the environmental field application. With various methods, TiO2 nanostructures with various morphology, properties and application can be developed. In this paper, the synthesis of TiO2 based nanoribbons with high adsorption property produced by alkaline hydrothermal methods were investigated. Its morphology, crystal structure and physical properties were characterized using Scanning Electron Microscope (SEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) and Brunauer-Emme
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6

ZHU, GANGQIANG, HONGYAN MIAO, GUOQIANG TAN, YUN LIU, and AO XIA. "HYDROTHERMAL SYNTHESIS OF POTASSIUM BISMUTH TITANATE NANOPARTICLES." International Journal of Nanoscience 05, no. 04n05 (2006): 663–69. http://dx.doi.org/10.1142/s0219581x06004954.

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Potassium bismuth titanate nanoparticles were prepared by the hydrothermal method using Ti ( C 4 H 9 O )4 and Bi ( NO 3)3·5 H 2 O as raw materials in alkaline solution at temperatures of 160–200°C. The crystal phase, particle size, morphology and dispersion of the particles were investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the particles with sizes of about 50–100 nm in diameter are well-dispersed K 0.5 Bi 0.5 TiO 3 (KBT) crystals of tetragonal structure, and the alkaline concentration and the temperature of solutions have great effec
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7

Takahagi, Wataru, Kaito Seo, Takazo Shibuya, et al. "Peptide Synthesis under the Alkaline Hydrothermal Conditions on Enceladus." ACS Earth and Space Chemistry 3, no. 11 (2019): 2559–68. http://dx.doi.org/10.1021/acsearthspacechem.9b00108.

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8

Gerasimova, L. G., A. I. Nikolaev, E. S. Shchukina, and M. V. Maslova. "Preparation of Precursor for Hydrothermal Synthesis of Alkaline Titanosilicates." Theoretical Foundations of Chemical Engineering 54, no. 4 (2020): 675–80. http://dx.doi.org/10.1134/s0040579520040077.

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9

Kitadai, Norio. "Energetics of Amino Acid Synthesis in Alkaline Hydrothermal Environments." Origins of Life and Evolution of Biospheres 45, no. 4 (2015): 377–409. http://dx.doi.org/10.1007/s11084-015-9428-3.

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10

Kozerozhets, I. V., G. P. Panasyuk, E. A. Semenov, M. G. Vasil’ev, G. E. Nikiforova, and I. L. Voroshilov. "Effect of Alkaline Medium on Hydrothermal Synthesis of Boehmite." Russian Journal of Inorganic Chemistry 66, no. 3 (2021): 427–32. http://dx.doi.org/10.1134/s0036023621030104.

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11

Cho, Woo-Seok, and Masahiro Yoshimura. "Hydrothermal synthesis of PbTiO3 films." Journal of Materials Research 12, no. 3 (1997): 833–39. http://dx.doi.org/10.1557/jmr.1997.0121.

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Well-crystallized polycrystalline films of tetragonal PbTiO3 have been synthesized on Ti metal substrates in concentrated alkaline solutions of Pb(OH)2 containing KOH by the hydrothermal method under saturated vapor pressure (2.0 MPa) at 200 °C. The film microstructure depended strongly on the Pb(OH)2 and KOH concentration. The grain size became larger from approximately 0.6 to 6 μm with an increase of KOH concentration from 1 to 4 M at 0.07 M Pb(OH)2, whereas the grains decreased in size with an increase of Pb(OH)2 concentration at 1 M KOH concentration. PbTiO3 film prepared in the aqueous so
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12

Li, Xiaoyu, and Huaming Yang. "Morphology-controllable Li2SiO3 nanostructures." CrystEngComm 16, no. 21 (2014): 4501–7. http://dx.doi.org/10.1039/c4ce00297k.

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Hydrothermal synthesis of lithium metasilicate (Li<sub>2</sub>SiO<sub>3</sub>) has been systematically studied in aqueous alkaline environments by varying the Li/Si molar ratios of the solid materials and the hydrothermal temperatures.
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13

Chen, Yun Xia, Cheng Wan, Xiao Li Su, Tao Zeng, and Si Yang Rao. "Determination of Experimental Conditions of Preparation of Zeolites from Fly Ashes via Alkaline Fusion Followed by Hydrothermal Crystallization." Advanced Materials Research 1061-1062 (December 2014): 342–50. http://dx.doi.org/10.4028/www.scientific.net/amr.1061-1062.342.

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In this study, we converted high silicon fly ashes (FA) to zeolites using a two stages conversion process: alkaline fusion followed by hydrothermal crystallization. The orthogonal experimental method was applied to design the experimental variables of alkaline fusing and hydrothermal crystallizing procedure. Alkaline fusion prior to hydrothermal synthesis was applied to collapse the FA crystalline phases and release Si content. Different from most of the research, the mixtures of NaOH and Na2CO3were used to increase the fusion temperature in order to remove the residue carbon simultaneously. A
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14

Wei, Hua, Mao-Wen Xu, Shu-Juan Bao, Fan Yang, and Hui Chai. "Design and synthesis of carbonized polypyrrole-coated graphene aerogel acting as an efficient metal-free catalyst for oxygen reduction." RSC Adv. 4, no. 33 (2014): 16979–84. http://dx.doi.org/10.1039/c4ra00015c.

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15

Zhu, Xiaochun, Nikolay Kosinov, Jan P. Hofmann, et al. "Fluoride-assisted synthesis of bimodal microporous SSZ-13 zeolite." Chemical Communications 52, no. 15 (2016): 3227–30. http://dx.doi.org/10.1039/c6cc00201c.

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The presence of small amount of fluoride in alkaline hydrothermal synthesis of SSZ-13 zeolite yields bimodal microporous particles with substantially improved performance in the methanol-to-olefins (MTO) reaction.
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16

Salih, Ali Mohammed, Craig Williams, and Polla Khanaqa. "Synthesis of Zeolite Na-LSX from Iraqi Natural Kaolin using Alkaline Fusion Prior to Hydrothermal Synthesis Technique." UKH Journal of Science and Engineering 3, no. 1 (2019): 10–17. http://dx.doi.org/10.25079/ukhjse.v3n1y2019.pp10-17.

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The synthesis of zeolite materials by hydrothermal transformation of kaolin using an alkaline fusion prior to hydrothermal synthesis method was investigated. The kaolin clay used in the present investigation was supplied from Iraq. The physical and chemical characterization of the starting kaolin and produced zeolite Na-LSX samples were carried out using different analytical techniques such as Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), X – Ray Diffraction (XRD), X – Ray Fluorescence (XRF), Thermogravimetric Analysis (TGA), Fourier Transform Infrared (FT-IR) Spect
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17

Mamedova, Gunel, and Gunel Nasirli. "Investigation of Various Influencing Factors of Hydrothermal Synthesis of Analcime Zeolite." Chemistry Journal of Moldova 16, no. 1 (2021): 60–67. http://dx.doi.org/10.19261/cjm.2021.792.

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This study presents an investigation of the use of the natural mineral of Nakhchivan Autonomous Republic to produce analcime zeolite of potential practical importance. The influence of temperature and crystallization time, the concentration of alkaline solution and mineralizer on the process of synthesis of analcime has been evaluated. The optimal conditions established for the synthesis of pure analcime with a 100% degree of crystallinity are as follows: temperature of 180°C, alkaline and mineralizer solution of 10-15% KOH and 5-10% KCl and processing time of 50 hours. It has been shown that
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18

Martin, William, and Michael J. Russell. "On the origin of biochemistry at an alkaline hydrothermal vent." Philosophical Transactions of the Royal Society B: Biological Sciences 362, no. 1486 (2006): 1887–926. http://dx.doi.org/10.1098/rstb.2006.1881.

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A model for the origin of biochemistry at an alkaline hydrothermal vent has been developed that focuses on the acetyl-CoA (Wood–Ljungdahl) pathway of CO 2 fixation and central intermediary metabolism leading to the synthesis of the constituents of purines and pyrimidines. The idea that acetogenesis and methanogenesis were the ancestral forms of energy metabolism among the first free-living eubacteria and archaebacteria, respectively, stands in the foreground. The synthesis of formyl pterins, which are essential intermediates of the Wood–Ljungdahl pathway and purine biosynthesis, is found to co
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19

Asawaworarit, Panuruj, Nuwong Chollacoop, Nawin Viriya-Empikul, and Apiluck Eiad-Ua. "Effect of Alkaline Activation on Low Grade Natural Kaolin for Synthesis of Zeolite A." Materials Science Forum 872 (September 2016): 206–10. http://dx.doi.org/10.4028/www.scientific.net/msf.872.206.

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The conventional technique to synthesizes zeolite A from kaolin is calcination. However, this technique has one drawback since, the impurities in kaolin, such as muscovite and quartz, remain. Therefore, the hydrothermal process without calcination is used to synthesize high purity zeolite A. Hydrothermal synthesis without calcination can be separated into two steps, namely first and second hydrothermal steps. Alkaline activation reaction in the first hydrothermal step was used to study the effect of NaOH concentration ranging from 4M, 6M, 8M, 10M to 12M at 200°C for 3 hours. In this step, sodi
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20

Thungngern, Pimpreeya, Phanwatsa Amnaphiang, Panuruj Asawaworarit, Vituruch Goodwin, Nuwong Chollacoop, and Apiluck Eiad-Ua. "Influence of Temperature and Alkaline Activation for Synthesis Zeolite A from Natural Kaolin." Key Engineering Materials 751 (August 2017): 410–16. http://dx.doi.org/10.4028/www.scientific.net/kem.751.410.

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Zeolite A from natural kaolin have been successfully synthesized via calcination and hydrothermal. However, these techniques have one drawback since, the impurities in kaolin such as muscovite and quartz in the kaolin structure, which depend on temperature and alkaline activation. This work was separated into two steps, first step was used calcination technique, and second step was used hydrothermal technique. Reaction of temperature in the first step was studied the influence of temperature from 500°C to 800°C for 3 hours. In this step, kaolin transformed to metakaolin and remain the impuriti
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21

Abdulla-Al-Mamun, Md, Yoshihumi Kusumoto, and Md Shariful Islam. "A new, simple hydrothermal synthesis of magnetic nano-octahedrons — Application to hyperthermia cancer cell killing." Canadian Journal of Chemistry 90, no. 8 (2012): 660–65. http://dx.doi.org/10.1139/v2012-046.

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Surfactant-free magnetic nano-octahedrons were successfully synthesized by the alkaline hydrothermal decomposition of ferric nitrate salt (Fe(NO3)3·9H2O) in a water–ethanol mixed solvent with a variety of alkaline concentrations. High-resolution scanning electron microscope (SEM) pictures demonstrated the formation of octahedron-structured magnetic nanoparticles at a 10 mol/L alkaline concentration. A possible synthesis mechanism of the magnetic nano-octahedron was discussed. An alternating current magnetic field to induce hyperthermia cancer cell killing was investigated. Maximum hyperthermia
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22

Gao, Li-Li, Shu-Yan Song, Jian-Fang Ma, and Jin Yang. "Hydrothermal Synthesis and Characterization of Alkaline-Earth Metal Phenylphosphonate Nanostructures." Crystal Growth & Design 7, no. 5 (2007): 895–99. http://dx.doi.org/10.1021/cg0606491.

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23

Keli, Zhang, Yuan Jibing, Yuan Liangjie, and Sun Jutang. "Hydrothermal synthesis and thermal decomposition mechanism of alkaline earth benzoates." Wuhan University Journal of Natural Sciences 4, no. 1 (1999): 89–94. http://dx.doi.org/10.1007/bf02827631.

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24

Septiani, Upita, Widya Yuliani Fatiha, and Syukri Arief. "SINTESIS DAN KARAKTERISASI ZEOLIT FAUJASIT DARI LIMBAH BATUBARA OMBILIN DENGAN METODA ALKALI HIDROTERMAL AIR LAUT." Jurnal Riset Kimia 8, no. 2 (2016): 165. http://dx.doi.org/10.25077/jrk.v8i2.235.

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Zeolite synthesis using Ombilin coal fly ash at low temperature with alkaline hydrothermal process has been carried out. The used Fly ash was melted by NaOH at a temperature of 550°C. Alkaline hydrothermal processes in zeolite synthesis performed with variations of temperature at 35°C , 45°C and 60°C . The zeolite that obtained was characterized by using Fourier Transform Infra Red (FT - IR), X - Ray Diffraction (XRD) , Scanning Electron Microscopy (SEM) in combination with EDX . The characterization results showed the formation of zeolite were better when an increasing in temperature processe
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25

Komarneni, S., and R. Roy. "Topotactic route to synthesis of novel hydroxylated phases: I. Trioctahedral Micas." Clay Minerals 21, no. 2 (1986): 125–31. http://dx.doi.org/10.1180/claymin.1986.021.2.02.

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AbstractK-depleted phlogopite mica was used as a topotactic precursor and treated with alkali (Li+, K+, , Rb+, Cs+), alkaline-earth (Mg2+, Ca2+, Sr2+, Ba2+) and trivalent (Al3+) cations under hydrothermal conditions of 200°C and 30 MPa pressure. K-, NH4-, Rb- and Cs-aluminosilicate micas were synthesised at 200°C in one day. The synthesis of Cs-aluminosilicate mica, with potential applications in the management of nuclear wastes, has been achieved for the first time by this approach. Ion exchange by Li+, Na+ and alkaline-earth cations under hydrothermal conditions did not produce anhydrous mic
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26

Usman, Mohammad Rofik, Atiek Rostika Noviyanti, and Diana Rakhmawaty Eddy. "Photocatalytic Degradation of Diazinon Using Titanium Oxide Synthesized by Alkaline Solvent." Indonesian Journal of Chemistry 17, no. 1 (2017): 22. http://dx.doi.org/10.22146/ijc.23548.

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Photoactivity of titanium dioxide (TiO2) can be improved by turning it into nanoparticles. Synthesis of TiO2 nanoparticles can be done by using hydrothermal method. Hydrothermal method is influenced by types of precursor, hydrothermal conditions, including time, temperature, type and concentration of reactants. The purpose of this study is to obtain a hydrothermal condition which produces crystals of TiO2 nanoparticles with high quality. The material used was titanium tetrachloride (TiCl4) as initial precursors and for the type of reactants was used aqudestilate, aquabidestilate, ethanol, t-bu
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27

Deng, Yanwen, Dehua Xiong, Han Gao, et al. "Hydrothermal synthesis of delafossite CuScO2 hexagonal plates as an electrocatalyst for the alkaline oxygen evolution reaction." Dalton Transactions 49, no. 11 (2020): 3519–24. http://dx.doi.org/10.1039/c9dt04791c.

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28

Liu, Zi Long, Fu Jun Xia, Qing Zhong Xue, Yong Gang Du, and Qi Kai Guo. "Hydrothermal Synthesis of Porous Graphene Nanosheets for Supercapacitors." Applied Mechanics and Materials 719-720 (January 2015): 119–22. http://dx.doi.org/10.4028/www.scientific.net/amm.719-720.119.

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Porous graphene has been easily synthesized by hydrothermal treating reduced graphene oxide in alkaline solution, and the porous structure was confirmed by transmission electron microscope. When used as supercapacitor electrode, porous graphene holds a specific capacitance of 88 F g-1 at an ultra-high current density of 50 A g-1, an increase of about 83% compared with that for the pristine graphene sheets. The results demonstrate that porous graphene opens a new and short way for ion transportation. Furthermore our findings provide a novel strategy to fabricate porous graphene and the process
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29

Suyanta, Suyanta, Narsito Narsito, Endang Tri Wahyuni, and Triyono Triyono. "SYNTHESIS AND CHARACTERIZATION OF MESOPOROUS ALUMINOSILICATES Al-MCM-41 AND INVESTIGATION OF ITS THERMAL, HYDROTHERMAL AND ACIDITY STABILITY." Indonesian Journal of Chemistry 10, no. 1 (2010): 41–45. http://dx.doi.org/10.22146/ijc.21478.

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The synthesis and characterization of mesoporous aluminosilicates Al-MCM-41 and the investigation of its thermal, hydrothermal and acidity stability have been done. Al-MCM-41 were synthesized by hydrothermal method to the mixture of sodium silicate as Si source, aluminium hydroxide as Al source, sodium hydroxide as a solvent, and cethyltrimethylammoniumbromide (CTAB) as structure directing agent. The reaction were carried out in alkaline condition (pH = 10.2) at 383 K for about 24 h, followed by calcination at 723 K for about 10 h. The synthesized crystals were characterized using FTIR spectro
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30

Zhang, Zhen, Yundan Liu, Zongyu Huang, et al. "Facile hydrothermal synthesis of NiMoO4@CoMoO4 hierarchical nanospheres for supercapacitor applications." Physical Chemistry Chemical Physics 17, no. 32 (2015): 20795–804. http://dx.doi.org/10.1039/c5cp03331d.

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31

Zhao, Liang, Xiaoxia Lv, Yanshi Wei, Chong Ma, and Lijun Zhao. "Hydrothermal synthesis of pure BaFe12O19 hexaferrite nanoplatelets under high alkaline system." Journal of Magnetism and Magnetic Materials 332 (April 2013): 44–47. http://dx.doi.org/10.1016/j.jmmm.2012.11.056.

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32

Reinik, Janek, Ivo Heinmaa, Jyri-Pekka Mikkola, and Uuve Kirso. "Hydrothermal alkaline treatment of oil shale ash for synthesis of tobermorites." Fuel 86, no. 5-6 (2007): 669–76. http://dx.doi.org/10.1016/j.fuel.2006.09.010.

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33

Qin, Wenqing, Congren Yang, Ran Yi, and Guanhua Gao. "Hydrothermal Synthesis and Characterization of Single-Crystalline -Fe2O3Nanocubes." Journal of Nanomaterials 2011 (2011): 1–5. http://dx.doi.org/10.1155/2011/159259.

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Single-crystalline - nanocubes were successfully obtained in large quantities through a facile one-step hydrothermal synthetic route under mild conditions. In this synthetic system, aqueous iron (III) nitrate () served as iron source and triethylamine served as precipitant and alkaline agent. By prolonging reaction time from 1 h to 24 h, the evolution process of -, from nanorhombohedra to nanohexahedron, and finally nanocube, was observed. The products were characterized by Powder X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), High-resoluti
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34

Jin, Fang, Yugang Cui, Zebao Rui, and Yongdan Li. "Effect of sequential desilication and dealumination on catalytic performance of ZSM-5 catalyst for pyridine and 3-picoline synthesis." Journal of Materials Research 25, no. 2 (2010): 272–82. http://dx.doi.org/10.1557/jmr.2010.0033.

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A sequential procedure of alkaline treatment followed by SiCl4 or hydrothermal treatment has been investigated to obtain a tailored ZSM-5 catalyst for the synthesis of pyridine bases. The major function of alkaline treatment is desilication; however, it is accompanied by the extraction of framework aluminum, which formed the extra-framework alumina and amorphous alumina by realumination. Moreover, a large number of intracrystalline meso- and macropores and silanol groups are created. The desilication and realumination cause the ratio of Lewis acid sites to Brönsted acid sites (L/B) to increase
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35

Du, Zijuan, Dehua Xiong, Santosh Kumar Verma, et al. "A low temperature hydrothermal synthesis of delafossite CuCoO2 as an efficient electrocatalyst for the oxygen evolution reaction in alkaline solutions." Inorganic Chemistry Frontiers 5, no. 1 (2018): 183–88. http://dx.doi.org/10.1039/c7qi00621g.

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36

Li, Xu, Heng Pan, Aiwei Tang, et al. "Hydrothermal Synthesis and Luminescent Properties of Eu3+ Doped Sr3Al2O6 Phosphor for White LED." Journal of Nanoscience and Nanotechnology 16, no. 4 (2016): 3474–79. http://dx.doi.org/10.1166/jnn.2016.11847.

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Eu3+ ions doped Sr3Al2O6 phosphors were successfully synthesized via a hydrothermal method. The precursor was prepared by low temperature hydrothermal method using ammonia as both alkaline source and precipitator. Then the final product was obtained by high temperature sintering. In addition, the structures, morphologies, and luminescent properties of as-prepared products were thoroughly characterized by X-ray powder diffraction (XRD), Scanning electron microscopy (SEM), Fluorescence spectroscopy (PL). XRD shown a single phase Sr3Al2O6 prepared by a facile hydrothermal method at 250 °C for 10
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37

Lizcano Cabeza, Jeimer Alexander, Luis Fernando Ávila Ascanio, Carlos Alberto Ríos-Reyes, and Luz Yolanda Vargas Fiallo. "A comparative study of two aging and fusion methods in the synthesis of zeolitic materials from natural clinker." DYNA 82, no. 193 (2015): 32–38. http://dx.doi.org/10.15446/dyna.v82n193.44217.

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A sample of Colombian natural clinker was evaluated as a raw material in a laboratory-scale synthesis of zeolitic materials using two methods of alkaline fusion, followed by two aging methods, and finally hydrothermal treatment during three different periods of time. Fusion was carried out with solid and aqueous NaOH and followed by static or ultrasonic aging. The process ended with a hydrothermal reaction. Natural clinker was converted into several zeolitic materials. The characteristics of the resulting zeolitic materials and the effects of experimental variations are discussed.
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38

Tan, Ta Anh, Do Thi Phuong, Nguyen Thi Tu Oanh, et al. "Investigation of Sodium Manganese Oxide Nanowires Synthesized by Hydrothermal Method for Alkaline Ion Battery." Communications in Physics 24, no. 3 (2014): 233. http://dx.doi.org/10.15625/0868-3166/24/3/4158.

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Sodium Manganese Oxide (NaxMnO2) has attracted much attention as cathode materials for alkaline ion battery due to the ability of fast charge and discharge ion Na+, in particular in nanoscale. We report on the synthesis of NaxMnO2 nanowires via hydrothermal synthesis route from Mn2O3 and NaOH solution. The morphological observation indicates that the obtained Na0.44MnO2 nanowires with diameters of about 20-30 nm, length up to several micrometers were formed by this process. The electrochemical properties of fabricated materials were investigated by means of cyclic voltammetry technique and sho
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39

Yang, Chung-Wei, and Guan-Kai Wang. "Effect of Hydrothermal (Sr)-Hydroxyapatite Coatings on the Corrosion Resistance and Mg2+ Ion Release to Enhance Osteoblastic Cell Responses of AZ91D Alloy." Materials 13, no. 3 (2020): 591. http://dx.doi.org/10.3390/ma13030591.

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The biomedical applications of Mg-based alloys are limited by their rapid corrosion rate in the body fluid. In this study, the hydrothermal synthesis is employed to produce protective bioactive hydroxyapatite coating (HAC) and strontium-substituted hydroxyapatite coating (Sr-HAC) to further enhance the corrosion resistance and in vitro biocompatibility of biodegradable AZ91D Mg alloy in physiological environments. For comparison, the brucite Mg(OH)2 prepared by the alkaline pre-treatment is designated as a control group. Experimental evidences of XRD and XPS analysis confirm that Sr2+ ions can
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40

Chu, Jing, Dan Yu Jiang, Na Zhang, Min Zhang, and Qiang Li. "Hydrothermal Synthesis of Nano-Structured Barium Titanate from Metatitanic Acid." Key Engineering Materials 434-435 (March 2010): 311–13. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.311.

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Nano-structured Barium Titanate (BaTiO3) was prepared by a hydrothermal method with the reaction between metatitanic acid and an alkaline solution of Ba(OH)2•8H2O. The morphology of as-obtained powders of BaTiO3 was determined by Scanning Electron Microscope, which revealed that well-dispersed nanoparticles were successfully synthesized. The phase composition was analyzed by X-ray diffraction, which shows that cubic phase of Barium Titanate was prepared. The optimal reaction conditions were discussed in detail.
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41

Wu, Wen Yuan, Chun Wei Shi, and Xue Bian. "Progress in Synthesis of Micro- and Mesoporous Composite Molecular Sieve." Advanced Materials Research 396-398 (November 2011): 1151–56. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.1151.

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Micro- and mesoporous composite molecular sieves enable to achieve grades distribution of pore sizes and appropriate collocation of acidity,which have potential applications in catalysis and adsorption of large molecules.This review focus on some of the most recent results during the last decades.The techniques applied to synthesize different micro-mesoporous composite molecular sieves includes single template, dual template, crystallization of mesoporous walls, alkaline desilication, vapor-phase transport synthesis,and microwave radiation hydrothermal synthesis.
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42

Xiao, Lu, Tao Zhou, and Jia Meng. "Hydrothermal synthesis of Mn–Zn ferrites from spent alkaline Zn–Mn batteries." Particuology 7, no. 6 (2009): 491–95. http://dx.doi.org/10.1016/j.partic.2009.04.012.

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43

Wan, Buyong, Chenguo Hu, Weijia Zhou, Hong Liu, and Yan Zhang. "Construction of strong alkaline hydrothermal environment for synthesis of copper telluride nanowires." Solid State Sciences 13, no. 10 (2011): 1858–64. http://dx.doi.org/10.1016/j.solidstatesciences.2011.07.018.

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44

Qi, Pengyuan, Jingyu Zhong, Shiyu Dai, Weimin Ma, and Lili Jiang. "Hydrothermal-solid state synthesis of Gadolinium aluminate nano whiskers with alkaline mineralizer." Materials Research Express 7, no. 3 (2020): 035021. http://dx.doi.org/10.1088/2053-1591/ab7dfd.

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45

Zhang, Xianlong, Ge Tian, Jing Gao, et al. "Prebiotic Synthesis of Glycine from Ethanolamine in Simulated Archean Alkaline Hydrothermal Vents." Origins of Life and Evolution of Biospheres 47, no. 4 (2016): 413–25. http://dx.doi.org/10.1007/s11084-016-9520-3.

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46

Liu, Yunfei, Yinong Lu, and Shenhua Dai. "Hydrothermal synthesis of monosized Bi0.5Na0.5TiO3 spherical particles under low alkaline solution concentration." Journal of Alloys and Compounds 484, no. 1-2 (2009): 801–5. http://dx.doi.org/10.1016/j.jallcom.2009.05.033.

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47

de Carvalho, Alexandre Fontes Melo, Tiago Roberto da Costa, Gilvan Pereira de Figueredo, et al. "Hydrothermal Synthesis of Zeolite a Using Non-Calcined Diatomite." Materials Science Forum 930 (September 2018): 3–7. http://dx.doi.org/10.4028/www.scientific.net/msf.930.3.

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Optimization and reduction of zeolite A synthesis costs are the focus of several studies. Attention has been given to the use of residues and natural materials rich in Si and Al, such as diatomite. Diatomite needs to be calcined above 500°C to be used, which increases processing costs. This study aimed at evaluating the use of diatomite without calcination in preparing zeolite A. Alkaline hydrothermal synthesis melting and 24 h of crystallization were carried out. The materials were characterized by XRD (X-ray powder diffraction), XRF (X-ray fluorescence), BET (N2physisorption) and SEM (Scanni
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48

Nikolic, Ljubica, Marija Maletin, Paula Ferreira, and Paula Vilarinho. "Synthesis and characterization of one-dimensional titanate structure." Processing and Application of Ceramics 2, no. 2 (2008): 109–14. http://dx.doi.org/10.2298/pac0802109n.

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One-dimensional titania structures were synthesized trough a simple hydrothermal process in a highly alkaline conditions. The aim of this work was to elucidate the effect of time on the formation of 1D titanates as well on its structural characteristics (morphology, phase composition, surface area). Apart from that, the effect of heat treatment conditions on the stability of titanate based 1D samples has been investigated. The results have revealed that it is possible to form one-dimensional titanates already after 1 hour of hydrothermal synthesis. Although the composition of titanates is stil
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49

Kenges, Kairat, Mailybi Aldabergenov, Olga Proskurina, and Victor Gusarov. "Hydrothermal synthesis of monostructured LaPO4: morphology and structure." Chemical Bulletin of Kazakh National University, no. 3 (September 29, 2018): 12–19. http://dx.doi.org/10.15328/cb1015.

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The application field of materials based on lanthanum orthophosphate (LaPO4) including nanomaterials, has been permanently extending recently. The high level of mechanical properties and the compatibility with numerous oxides make it possible to consider the possibility of using lanthanum orthophosphate as a composite material for construction purposes. This application is particularly promising when nanoparticles with quasi-1D morphology (nanorods) are used. The high isomorphic capacity of the LaPO4-based phase for alkaline-earth ions and ions of lanthanides and actinides, high chemical stabi
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50

Goh, Gregory K. L., Carlos G. Levi, and Fred F. Lange. "Hydrothermal epitaxy of KtaO3 thin films." Journal of Materials Research 17, no. 11 (2002): 2852–58. http://dx.doi.org/10.1557/jmr.2002.0414.

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Heteroepitaxial KTaO3 thin films were synthesized by the hydrothermal method below 175 °C in highly alkaline aqueous KOH solutions. KTaO3 films synthesized in 7 M KOH solutions contained a defect pyrochlore phase that had (400) and (111) out-of-plane orientations. The (400) oriented pyrochlore islands were epitaxially related to the (100) SrTiO3 substrate while the (111) oriented pyrochlore islands had four in-plane variants. Pyrochlore-free KTaO3 films could be synthesized in a 15 M KOH solution. Pyrochlore-free films were also grown at 7 M KOH by delaying the introduction of the (100) SrTiO3
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