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Статті в журналах з теми "Coprecipitation method"

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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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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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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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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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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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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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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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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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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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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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Дисертації з теми "Coprecipitation method"

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LETICHEVSKY, SONIA. "EFFECT OF THE PREPARATION CONDITIONS ON THE CHARACTERISTICS OF THE CEO2-ZRO2 MIXED OXIDES PREPARED BY COPRECIPITATION METHOD." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5212@1.

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Анотація:
PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
Os óxidos mistos CeO2-ZrO2 são utilizados como suporte de catalisadores automotivos devido a sua capacidade de estocar e liberar oxigênio em condições pobres ou ricas de combustível, respectivamente, a fim de auxiliar nas reações redox que minimizam a emissão de poluentes oriunda da queima incompleta do combustível. Neste trabalho, os óxidos mistos CeO2-ZrO2 foram preparados pelo método de coprecipitação, utilizando-se como sais precursores o ZrO(NO3)2 e o (NH4)2Ce(NO3)6 ou Ce(NO3)3 com a finalidade de se observar a influência do sal precursor de cério no sistema CeO2-ZrO2. Além disso, investigou-se o efeito de algumas condições de preparação como o envelhecimento do precipitado, o controle de pH durante a síntese, a secagem e o envelhecimento térmico nos óxidos mistos obtidos. Os resultados mostram que a variável mais significante na preparação dos óxidos mistos CeO2-ZrO2 por coprecipitação é o sal precursor de cério. Em todas as amostras preparadas a partir do precursor de cério IV houve a formação de solução sólida, enquanto que no caso das amostras preparadas a partir do precursor de cério III observou-se a formação de duas fases segregadas, c-CeO2 e t-ZrO2. Além disso, concluiu-se que a redução do material obtido não ocorre somente na superfície, mas também na parte mássica e que os materiais formados por solução sólida são os que apresentam melhor capacidade de armazenamento de oxigênio o que é muito importante para o uso em catalisadores automotivos. O envelhecimento térmico do catalisador mostrou que há uma sinterização devido à alta temperatura e que também há uma segregação da solução sólida quando esta foi submetida às condições de envelhecimento utilizadas.
The CeO2-ZrO2 mixed oxides are used as automotive catalyst support due to their capacity to storage and to release oxygen in lean and rich conditions, respectively, in order to assist redox reactions that minimize the emission of pollutants caused by fuel incomplete combustion. In this present work, the CeO2- ZrO2 mixed oxides had been prepared by the coprecipitation method using as precursor salts the ZrO(NO3)2 and the (NH4)2Ce(NO3)6 or the Ce(NO3)3 with the purpose of observing the influence of the cerium precursor salt in the CeO2-ZrO2 system. Moreover, the effect of some preparation conditions like drying, thermal aging, pH control and aging along precipitation was investigated. The results show that the most significant variable in the coprecipitation preparation of the CeO2-ZrO2 mixed oxides is the cerium salt precursor. There were formation of solid solutions in all samples prepared from the cerium IV precursor, while in the case of the samples prepared from the cerium III precursor, it was observed formation of two segregated phases, c-CeO2 and ZrO2. In addition, one concluded that the reduction of the obtained material does not only occur in the surface, but also in the bulk. The solid solution materials are the ones that present the best oxygen storage capacity what is very important for the use in the automotives catalysts. The thermal aging of the catalyst showed that there are a sintering due to the high temperature and a segregation of the solid solution when the material was submitted to the used aging conditions.
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Maranhão, Willian Camargo Aires. "Síntese e caracterização de ferritas de Mn-Zn nanoestruturadas." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-06092017-090659/.

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Анотація:
O objetivo deste trabalho foi investigar a influência da variação da concentração micelar crítica do surfactante cetiltrimetil brometo de amônio (CTAB) na síntese, pelo método de coprecipitação, do composto Zn0,25Mn0,75Fe2O4 (Frankilinita) e ainda a influência do processamento das amostras por reação hidrotermal. Foram utilizadas concentrações de 1, 2, 3, 4, 5 e 10 vezes a concentração micelar crítica de CTAB, resultando em 12 amostras: seis com e seis sem tratamento hidrotermal. As amostras foram caracterizadas por difração de raios X, espectrometria de infravermelho (FTIR) e medidas magnéticas. A análise magnética foi realizada por um susceptometria AC, sendo possível obter a susceptibilidade magnética e a densidade de energia magnética. Foram realizadas análises dos espectros de absorção por FTIR, identificando duas fases, Frankilinita e Akaganéita. A estrutura e morfologia das nanoferritas foram analisadas por difração de raios X, mostrando que na síntese por coprecipitação existiu uma tendência no aumento do tamanho médio de cristalitos da fase Akaganéita e diminuição do tamanho médio de cristalitos da fase Frankilinite. As amostras submetidas a tratamento hidrotermal apresentaram tendência à diminuição do tamanho médio de cristalitos de ambas as fases, bem como o aumento da porcentagem da fase Frankilinite, comparativamente às amostras sintetizadas apenas por coprecipitação, sugerindo que o tratamento hidrotermal foi efetivo na obtenção de materiais nanoestruturados de partículas menores.
The objective of this work was to investigate the influence of the critical micelle concentration of the CTAB surfactant on the synthesis of the compound Zn0.25Mn0.75Fe2O4 (Frankilinite) by the coprecipitation method and then processing fractions of the synthesized material by hydrothermal treatment. The magnetic characterization was performed by AC susceptometry, being possible to determine the magnetic susceptibility and the dissipated energy. The FTIR analysis identified two phases, Frankilinite and Akaganéite. The structure and morphology of the nanoferrites were analyzed by X-ray diffraction and it was shown that the samples synthesized by coprecipitation only presented the tendency to increasing of crystallite sizes of the akaganéita phase and decreasing of crystallite sizes of the Frankilinite 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 Frankilinite 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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Passos, Rafael Hernandez Damascena dos. "S?ntese e caracteriza??o de p?s Ba(x)Sr(1-x)Co0,8Fe0,2O3- atrav?s do m?todo de coprecipita??o via oxalato." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18557.

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Анотація:
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Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico
Ceramic powders based on oxides of perovskite-type structure is of fundamental interest nowadays, since they have important ionic-electronic conductivity in the use of materials with technological applications such as gas sensors, oxygen permeation membranes, catalysts and electrolytes for solid oxide fuel cells (SOFC). The main objective of the project is to develop nanostructured ceramic compounds quaternary-based oxide Barium (Br), Strontium (Sr), Cobalt (Co) and Iron (Fe). In this project were synthesized compounds BaxSr(1-x)Co0, 8Fe0,2O3- (x = 0.2, 0.5 and 0.8) through the oxalate co-precipitation method. The synthesized powders were characterized by thermogravimetric analysis and differential thermal analysis (TGADTA), X-ray diffraction (XRD) with the Rietveld refinement using the software MAUD and scanning electron microscopy (SEM). The results showed that the synthesis technique used was suitable for production of nanostructured ceramic solid solutions. The powders obtained had a crystalline phase with perovskite-type structure. The TGA-DTA results showed that the homogeneous phase of interest was obtained temperature above 1034?C. It was also observed that the heating rate of the calcination process did not affect the elimination of impurities present in the ceramic powder. The variation in the addition of barium dopant promoted changes in the average crystallite size in the nanometer range, the composition being BSCF(5582) obtained the lowest value (179.0nm). The results obtained by oxalate co-precipitation method were compared with those synthesis methods in solid state and EDTA-citrate method
P?s cer?micos ? base de ?xidos de estrutura do tipo perovsquita ? de fundamental interesse atualmente, pois apresentam condutividade i?nica e eletr?nica importante na utiliza??o de materiais com aplica??es tecnol?gicas como: sensores de gases, membranas perme?veis ao oxig?nio, catalisadores e eletr?lito para c?lulas a combust?vel de ?xido s?lido . O objetivo principal dessa pesquisa ? desenvolver compostos cer?micos quarten?rios nanoestruturados ? base de ?xidos de B?rio (Br), Estr?ncio (Sr), Cobalto (Co) e Ferro (Fe). Nesse trabalho foram sintetizados compostos de BaxSr(1-x)Co0,8Fe0,2O3-(x = 0,2, 0,5 e 0,8) atrav?s do m?todo de coprecipita??o via oxalato. Os p?s sintetizados foram caracterizados por an?lise termogravim?trica e termodiferencial (TGA-TDA), difra??o de raios X (DRX) com refinamento pelo m?todo de Rietveld atrav?s do software MAUD e microscopia eletr?nica de varredura (MEV). Os resultados obtidos mostraram que a t?cnica de s?ntese utilizada foi satisfat?rio para produ??o de solu??es s?lidas cer?micas nanoestruturadas. Os p?s obtidos apresentaram uma fase cristalina com estrutura do tipo perovsquita. O resultado de TGA-DTA apresentou que a fase homog?nea de interesse foi obtida a temperatura acima de 1034?C. Foi observado tamb?m que a taxa de aquecimento do processo de calcina??o n?o interferiu na elimina??o das impurezas presentes no p? cer?mico. A varia??o na adi??o do dopante b?rio promoveu altera??es no tamanho m?dio de cristalito em escala nanom?trica, sendo a composi??o BSCF(5582) obtido o menor valor (179,0nm). Os resultados obtidos pelo m?todo de coprecipita??o foram comparados com os m?todos de s?ntese em estado s?lido e complexa??o EDTA-citrato
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Воронова, Анастасія Сергіївна. "Синтез та каталітичні властивості мезопоруватих нікель-кобальтових шпінелей та їх композитів". Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/29007.

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Анотація:
У контексті сучасного пошуку та досліджень альтернативних джерел енергії електрохімічні системи зберігання та перетворення енергії займають значну нішу. Відкритим для дослідження питанням, пов'язаним з електрохімічними джерелами енергії, є розробка та пошук ефективних, екологічно чистих та економічно ефективних каталізаторів для паливних елементів. Перспективним напрямком у цій сфері є дослідження змішаних оксидних каталізаторів, зокрема каталізаторів зі структурою шпінелі. Сполукою, що привертає значну увагу у цій області є Ni-, Co-шпінель складу NiCo2O4 та її різноманітні композитні матеріали із поруватими носіями з розвиненою поверхнею. Об’єкт дослідження – нікель-кобальтові шпінелі та їх композити з багатошаровими вуглецевими нанотрубками та активованим вугіллям. Предмет дослідження – синтез, фізико-хімічні властивості нікель-кобальтових шпінелей та їх композитів з багатошаровими вуглецевими нанотрубками та активованим вугіллям. Метод дослідження – експериментальний. У ході роботи досліджено структурні характеристики, морфологію поверхні та фазовий склад зразків за допомогою методів низькотемпературної адсорбції-десорбції азоту, скануючої електронної мікроскопії, інфрачервоної спектроскопії та рентгеноструктурного аналізу. Каталітичну активність синтезованих зразків досліджено в модельних рідинно-фазних гетерогенно-каталітичних реакціях гідролізу борогідриду натрію та розкладання пероксиду водню. Іоннообмінні характеристики поверхні синтезованих зразків досліджено методом pH-потенціометричного титрування. У якості методу синтезу запропоновано простий на технологічний метод співосадження. Синтезовано чисті нікель-кобальтові шпінелі, а також та їх композити з багатошаровими вуглецевими нанотрубками та активованим вугіллям. Як показали отримані дані, синтезовані зразки володіють усіма властивостями ефективного каталізатора, який може бути використаний в електрохімічних джерелах енергії. Синтезовані композитні матеріали можна застосовувати у різноманітних електрохімічних пристроях зберігання та перетворення енергії, в тому числі у борогідридних паливних комірках прямої дії.
In the context of modern search and investigation of alternative energy sources, electrochemical energy storage and convertion systems occupy a significant niche. Open for research issue, related to electrochemical energy sources, is the development and search of efficient, environmentally friendly and cost-effective catalysts for fuel cells. A promising direction in this area is the study of mixed oxide catalysts, namely catalysts with a spinel structure. The compound that attracts considerable attention in this area is the Ni-, Co-spinel of the NiCo2O4 composition and its various composite materials with the developed surface carrier. The object of the study is Ni-, Co-spinels and their composites with multiwalled carbon nanotubes and activated carbon. The subject of the study is the synthesis, physical and chemical properties of Ni-, Co-spinels and their composites with multiwalled carbon nanotubes and activated carbon. The research method is experimental. During the work, the structural characteristics and surface morphology of the samples were investigated using methods of low-temperature N2 adsorption-desorption, scanning electron microscopy and X-ray diffration. The catalytic activity of the synthesized samples was investigated in the course of a model liquid-phase heterogeneous-catalytic reaction of sodium borohydride hydrolysis and decomposition of hydrogen peroxide. The ion exchange characteristics of the synthesized samples surface were investigated during pH-tertiometric titration. A simple and technological method of co-precipitation was proposed as a synthesis method. Pure nickel cobaltite and its composites with active carbon and carbon nanotubes were synthesized. As the obtained data showed, the synthesized samples possess all the properties of an effective catalyst that can be used in electrochemical energy sources. The synthesized composite materials can be used in a variety of electrochemical storage and energy conversion devices, including direct borohydride fuel cells.
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Bai, Shi-Yun, and 白世芸. "Synthesis of Delafossite CuFeO2 powders by Chemical Coprecipitation Method." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/4yty29.

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Анотація:
碩士
國立臺北科技大學
資源工程研究所
105
The objective of this study is to discover a new co-precipitation method for the synthesis of delafossite CuFeO2 powders at 90oC in ambient environment. Tetramethylammonium hydroxide, the capping agent, and ethylenediamine, the chelating agent, are used to control the precipitation rate of copper and iron ions during the formation of the binary metal oxide. All products are measured by using XRD, XPS, and VSM. The XRD analyses show that the products are mainly composed of delafossite CuFeO2 with trace of tenorite (CuO) and maghemite (Fe2O3). XPS spectra also confirm the bivalent states of copper ions in the samples. The magnetization for particles synthesized at low temperature is very weak. Finally, methylene blue was used as the target pollutants in the photocatalytic degradation reaction, 88.3 % of methylene blue was removed in 150 minutes. It was found that CuFeO2 powders could effectively degrade methylene blue. Photocatalytic degradation of methylene blue has been investigated in CuFeO2 aqueous suspensions. 88.3% of methylene blue is decomposed within 150 min using CuFeO2 powders as the catalyst.
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LI, TING-HUEI, and 李庭慧. "Removing Boron From Wastewater By Calcium-Phosphate Coprecipitation Method." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/35858589886465916735.

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Анотація:
碩士
萬能科技大學
環境工程研究所
105
The application and limitation of removing boron from wastewater by calcium-phosphate coprecipitation method was investigated. Effects of precipitant molar ratio, reaction temperature, and reaction time on the removal efficiency of anions were examined. It was found that the higher the molar ratio, and reaction temperature, the higher removal efficiency of boron. Moreover, time required to remove of boron was 30 min. It was experimentally concluded that under suitable conditions, the boron can be efficiently removed and the removal performances was 99%. Some problems that should be overcome for the practical application of chemical precipitation method to remove the anions from wastewater were also discussed.
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7

HO, Cheng-Hua, and 何政樺. "Preparation of Ferrites by Using Industrial Wastes as Raw Materials by Chemical Coprecipitation Method." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/51316550192970664362.

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Анотація:
碩士
吳鳳技術學院
光機電暨材料研究所
95
Mn-Zn ferrite and Ni-Cu-Zn ferrite prepared from the industrial waste by chemical coprecipitation method was studied in this research.(a)Mn-Zn ferrite was manufactured by using steel pickling liquid and used dry butteries as rawmaterials,reacting with excess hydrochloric acid,and coprecipitation with adding NaOH rate filtered solution.From the XRD patterns,the structure of Mn-Zn ferrite is only spinel cubic structure with the powder size of 10~40nm,measured from TEM by the VSM,the magnetic properties of Mn-Zn ferrite powder is Mr(residual magnetization)equal 0.694 emu/g,Ms(saturation magnetization)equal 58.8 emu/g,Hci(coercive force)equal 3.83 Oe.(b)Ni-Cu-Zn ferrite was prepared by using steel pickling liquid,nickel electroplating waste solution,copper electroplating waste solution and zinc electroplating soluction as raw materials,adjusting the corresponding iron concentrations by ICP-OES,and coprecipitation with adding NaOH rate the mixed soluting .The plase strute of Ni-Cu-Zn ferrite is only spinel cubic structure with the powder particle size of 5~20nm,the magnetic prepared of Ni-Cu-Zn ferrite is Ms saturation magnetization)equal 31.2 emu/g.According to some of the commercial products, this product can be prepared and must properties of this product measured by XRD,LCR,Q meter,SEM,TEM and VSM match with phone of corresponding commercial product.
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Chia-CheChuang and 莊佳哲. "Phase Separation Behavior and Redox Properties of Ce0.6Zr0.4O2 Powders Prepared by Chemical Coprecipitation Method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/45943573887121186752.

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Анотація:
博士
國立成功大學
資源工程學系碩博士班
101
CexZr1-xO2 (1〉x〉0, CZ) has unique oxygen storage capacity (OSC) which can be applied in three way catalysts to promote emission conversion efficiency. But, CZ appeared phase separation after high temperature treatment which deteriorated the OSC. The redox properties of CZ are strongly dependent on the crystal phase, texture and homogeneity. However, the explanation and mechanism for the improved redox properties were not fully resolved yet, and the conclusions still existed controversies. The aims of this study were to observe the phase separation behavior and investigate the phase separation mechanism of Ce0.6Zr0.4O2 (C60Z) prepared by chemical coprecipitation method. The redox properties of C60Z were observed under alternate reduction/oxidation atmosphere. Furthermore, the effects for the addition of aliovalent cations to the influence of C60Z phase separation were also investigated. The phase separation of C60Z appeared during heating stage which might belong to thermal activated process. We observed the phase separation phenomenon of C60Z calcined at 1000 °C for various durations. The original c'-C60Z gradually separated into c+t phases and the compositions of the two separated phases were gradually changed with the duration time. The A. N. ratios of C60Z increased rapidly in the beginning of phase separation, indicating that C60Z tended to aggregate together. And it also exhibited that the texture behavior of C60Z was grain boundary dominated during phase separation. The phase separation mechanism of C60Z was interface controlled and the activation energy for phase separation was 398(±20) kJ/mol from the kinetic results. We found that Zr enriched at the interface between particles after the appearance of C60Z phase separation from the TEM observation,, which was very similar to the initial stage of sintering and exhibited that Zr+4 played an important role in C60Z phase separation. The diffusion rate of Zr+4 is faster than that of Ce+4 due to the smaller ionic radius of Zr+4 than that of Ce+4. The driving force for phase separation was from the surface energy difference between crystallite surface and interface. Hence, Zr+4 diffused to the interface between particles to lower the surface energy of the system, which resulted in the composition gradually change and led to phase separation. The C60Z powders tended to aggregate in advance to create the surface energy difference between crystallite surface and interface, which induced Zr+4 diffused to the interface between crystallites and appeared C60Z phase separation. We observed other different Ce/Zr ratios of CZ (C77Z and C26Z) samples calcined at 1000 °C for various durations. It took longer duration time for the appearance of C77Z phase separation than that for the C60Z and C26Z. There are more Ce contents in C77Z than that in C60Z and C26Z, which resulted in Zr movement difficult and retarded phase separation. The single cubic C60Z powders transformed into cation-ordering pyrochlore structure after calcinations at 1200°C for 2h under a reducing atmosphere, and no phase separation appeared. The two separated phases (Ce-rich and Zr-rich phases) obtained after calcinations at 1100°C for 2 h transformed into a pyrochlore structure after heat treatment at 1490°C under a reducing atmosphere , and then this structure transformed into separated phases after further calcination at 1200°C for 2h in air, suggesting that the order-disorder phase transformation under reduction/re-oxidation treatment might be attributed to Zr diffusion. The reduction peak and the reduction fraction were shifted to higher temperatures and the OSC was also deteriorated after the appearance of phase separation for C60Z. The inhomogeneity originating from the phase separation may inhibit the oxygen release in the CZ system. The influences of Al+3 or Ba+2 additions to C60Z phase separation were also investigated. The ACZ-C powders synthesized by chemical coprecipitation method could prevent crystallite aggregation and growth, which inhibited C60Z phase separation. The results of ACZ-C were consistent with the interface controlled mechanism of C60Z phase separation. Besides, The OSC properties of ACZ-C were also improved. The addition of an appropriate amount of Ba+2 ions into C60Z by impregnation method was effective in retarding phase separation, and increasing the specific surface area of C60Z. Ba+2 would react with Zr of C60Z to form BaZrO3 which provided active oxygen species between the interfaces of C60Z and BaZrO3, and also promoted OSC.
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9

YEN, W. B., and 顏文彬. "A Study of (Mn,Ni,Cu)3O4 NTC Ceramics Made from Powder Prepared by Coprecipitation Method." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/19190017079680864638.

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Cui, Qiao-Zhu, and 崔喬筑. "Preparation of ZnMgAl-LDH Coated Magnetic Silica Nanoparticles by Seed Layered- Coprecipitation Method for Methyl Orange Adsorption." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/r6s26g.

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Анотація:
碩士
國立高雄應用科技大學
化學工程與材料工程系博碩士班
103
Layered double hydroxide (LDH) is a layered structure material consisting of divalent and trivalent metal hydroxides, wherein the anion compounds and water are replaceable. As a result, LDH can function like an anion exchanger. The LDH composite integrated with magnetic component could be recovered by magnet and used in establishing a separation process without centrifugation and filtration. A simple route for preparing a magnetic LDH with high adsorption capacity is still a challenge work. Accordingly, this article proposed a two-stage synthetic method for preparing a high adsorption capacity magnetic LDH material. First, the magnetic silica cores (Fe3O4@SiO2) were covered with aluminum isopropoxide to form the aluminum hydroxide (AlOOH) layer which was severed as the seed layer for LDH growth. Then, the LDH shell was fabricated by co-precipitation reaction of zinc nitrate, magnesium nitrate, and urea. The resultant core-shell magnetic LDH composite (Fe3O4@SiO2@ZnMgAl-LDH) was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and the surface area and pore size analyzer (BET). TEM images showed the radius of the magnetic core (Fe3O4@SiO2) was 60 nm, the LDH sheet was 50-150 nm long and 1-2 nm wide. The as-prepared magnetic LDH was mesoporous with a pore diameter of 6.5 nm and a specific surface area of 360 m2/g material. Methyl orange (isoelectric point (pI) = 3.1) was employed as the adsorbate for investigating the adsorption properties of the Fe3O4@SiO2@ZnMgAl-LDH. The adsorption capacity decreases as the increase in temperature. In addition, the highest adsorption capacity was in the range of pH 5-6 and reached to the level of 2800 mg/g adsorbent at 25°C, implying that the adsorption behavior was governed by the electrostatic interaction. The adsorption behavior of Fe3O4@SiO2@ZnMgAl-LDH could be well fitted with Dubinin-Radushkevich model, indicating that the adsorption ability among various adsorption sites were different. The time course adsorption study demonstrated that the adsorption of methyl orange by Fe3O4@SiO2@ZnMgAl-LDH approached pseudo-second kinetics; therefore, chemical adsorption may dominate the whole adsorption process. Additionally, the whole adsorption process may involve three stages: exterior diffusion, interior diffusion and equilibrium stage. The seed layer-coprecipitation method proposed in this article can fabricate high adsorption capacity magnetic LDH composite and develop novel the magnetic adsorbents with high adsorption ability.
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Частини книг з теми "Coprecipitation method"

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Dong, Hongying, Yingchai Shuang, Qinghong Sun, Qi Ren, and Wen Ma. "Preparation of LaPO4 Nanoparticles by Coprecipitation Method." In Advanced Functional Materials, 643–49. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0110-0_71.

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2

Watanabe, Akio, Hajime Haneda, Yusuke Moriyoshi, Shin-ichi Shirasaki, and Hiroshi Yamamura. "HIP of Zn2TiO4 Prepared by Coprecipitation Method." In Sintering ’87, 785–90. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1373-8_132.

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3

Chakraborty, Akshoy Kumar. "Mullite Precursors Synthesized by the Coprecipitation Method." In Mullite Formations, 43–69. New York: Jenny Stanford Publishing, 2021. http://dx.doi.org/10.1201/9781003031673-4.

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4

Kim, Chang Woo, and Young Soo Kang. "Preparation of Hard Phase Nd-Fe-B Nanoparticles by Coprecipitation Method." In Solid State Phenomena, 279–82. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-30-2.279.

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Lu, Xin, Jian Tian, Xiyan Zhang, and Xiaoyun Mi. "Study on the Preparation and Characteristics of Yb3 + :Y2O3 Ultrafine Powders by Coprecipitation Method." In Recent Advances in Computer Science and Information Engineering, 775–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25778-0_109.

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Johnson, D. W. "Coprecipitation." In Inorganic Reactions and Methods, 6–9. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145333.ch4.

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Michel, Carlos R., Alma H. Martínez-Preciado, Miguel A. Lopez-Alvarez, George P. Bernhardt, and José A. Rivera-Mayorga. "Novel CO and CO2 Sensor Based on Nanostructured Dy2O3 Microspheres Synthesized by the Coprecipitation Method." In Materials Horizons: From Nature to Nanomaterials, 95–116. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4810-9_4.

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Wang, Jing, Shuxin Bai, Hong Zhang, and Changrui Zhang. "The Effect of Precipitator Types on the Synthesis of La2 Zr2 O7 Powders by Chemical Coprecipitation Method." In Ceramic Transactions Series, 189–95. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470880456.ch17.

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Ikemachi, Takaaki, Minoru Takai, Teruhiko Ienaga, Toshiaki Yokoo, Yorinobu Yoshisato, Shoichi Nakano, and Yukinori Kuwano. "Critical Current Density of Y-Ba-Cu-O Ceramics Prepared by the Coprecipitation Method and their Application to Superconducting Devices." In Advances in Superconductivity, 439–43. Tokyo: Springer Japan, 1989. http://dx.doi.org/10.1007/978-4-431-68084-0_74.

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Xu, Gang, Zhao Hui Ren, Wen Jian Weng, Pi Yi Du, and Gao Rong Han. "Synthesis of Perovskite Pb(Zr0.52Ti0.48)O3 (PZT) Powders by a Modified Coprecipitation Method." In High-Performance Ceramics III, 627–30. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.627.

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Тези доповідей конференцій з теми "Coprecipitation method"

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Li Shengtao, Wang Hui, Lin Chunjiang, Yang Yang, and Li Jianying. "Dielectric properites of Al-doped CaCu3Ti4O12 ceramics by coprecipitation method." In 2011 International Symposium on Electrical Insulating Materials (ISEIM). IEEE, 2011. http://dx.doi.org/10.1109/iseim.2011.6826267.

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Sunder, Shyam, Sunil Rohilla, Sushil Kumar, Praveen Aghamkar, S. K. Tripathi, Keya Dharamvir, Ranjan Kumar, and G. S. S. Saini. "Structural Characterization of Spinel Zinc Aluminate Nanoparticles Prepared By Coprecipitation Method." In INTERNATIONAL CONFERENCE ON ADVANCES IN CONDENSED AND NANO MATERIALS (ICACNM-2011). AIP, 2011. http://dx.doi.org/10.1063/1.3653640.

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Frantina, Yusna Iin, Fauziatul Fajaroh, Nazriati, Yahmin, and Sumari. "Synthesis of MgO/CoFe2O4 nanoparticles with coprecipitation method and its characterization." In THE 4TH INTERNATIONAL CONFERENCE ON MATHEMATICS AND SCIENCE EDUCATION (ICoMSE) 2020: Innovative Research in Science and Mathematics Education in The Disruptive Era. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0043377.

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Seema and Sunil Rohilla. "Rietveld refinement and structural characterization of powder ZnFe2O4 synthesized through coprecipitation method." In ADVANCES IN BASIC SCIENCE (ICABS 2019). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5122522.

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LIU, Jianming, Juan WANG, and Shu ZHANG. "Study on Treatment of High Chromium Industrial Wastewater by Pulsed Field-Coprecipitation Method." In International Conference on Biological Engineering and Pharmacy 2016 (BEP 2016). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/bep-16.2017.74.

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Preeti and Sunil Rohilla. "Rietveld refinement and structural characterization of (La1.2Sr0.8) InMnO6 nanopowders synthesized by coprecipitation method." In ADVANCES IN BASIC SCIENCE (ICABS 2019). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5122589.

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Seema and Sunil Rohilla. "Optimization of magnetic property parameters of CoFe2O4/SiO2 composites prepared through coprecipitation method." In INTERNATIONAL CONFERENCE ON EMERGING APPLICATIONS IN MATERIAL SCIENCE AND TECHNOLOGY: ICEAMST 2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0008168.

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Kumar, Narender, Sunil Rohilla, Ankita Gupta, and Jasvir Dalal. "Structural Characterization of Mn2[Fe (CN)6].xH2O Nanocrystalites Synthesized by Coprecipitation Method." In 2021 International Conference on Advances in Electrical, Computing, Communication and Sustainable Technologies (ICAECT). IEEE, 2021. http://dx.doi.org/10.1109/icaect49130.2021.9392407.

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Yadav, Anand, Pankaj Choudhary, and Dinesh Varshney. "Crystal and lattice structure of Cr doped Mn-Zn ferrites synthesized by coprecipitation method." In DAE SOLID STATE PHYSICS SYMPOSIUM 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4980568.

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Mas'udah, Kusuma Wardhani, Pelangi Eka Yuwita, Yuanita Amalia Haryanto, Ahmad Taufiq, and Sunaryono. "Effect of heat treatment on carbon characteristic from corncob powders prepared by coprecipitation method." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015777.

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Звіти організацій з теми "Coprecipitation method"

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Peretrukhin, V. F., V. I. Silin, A. V. Kareta, A. V. Gelis, V. P. Shilov, K. E. German, E. V. Firsova, A. G. Maslennikov, and V. E. Trushina. Purification of alkaline solutions and wastes from actinides and technetium by coprecipitation with some carriers using the method of appearing reagents: Final Report. Office of Scientific and Technical Information (OSTI), September 1998. http://dx.doi.org/10.2172/663471.

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Bessonov, A. A., N. A. Budantseva, A. V. Gelis, M. V. Nikonov, and V. P. Shilov. Investigation on the coprecipitation of transuranium elements from alkaline solutions by the method of appearing reagents. Study of the effects of waste components on decontamination from Np(IV) and Pu(IV). Office of Scientific and Technical Information (OSTI), September 1997. http://dx.doi.org/10.2172/554187.

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