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تعداد نتایج: 240

Cerium-Based Materials: Synthesis, Properties and Applications

By Ramesh Chandra, Ravi Tomar
Publisher: Bentham Science Publishers, 2023-05-23
Pages: 127
Language: en
ISBN_13:9789815080094
ISBN_10:9815080091
Subject: Science

Cerium Oxide (CeO2): Synthesis, Properties and Applications

جزئیات و درخواست

By Salvatore Scire, Leonardo Palmisano
Publisher: Elsevier, 2019-08-21
Pages: 402
Language: en
ISBN_13:9780128156629
ISBN_10:0128156627
Subject: Technology & Engineering

Functional Nanomaterials

Synthesis, Properties, and Applications

جزئیات و درخواست

By Wai-Yeung Wong, Qingchen Dong
Publisher: John Wiley & Sons, 2022-06-07
Pages: 564
Language: en
ISBN_13:9783527347971
ISBN_10:3527347976
Subject: Science

Cerium Oxide Nanoparticles and Gadolinium Integration

Synthesis, Characterization and Biomedical Applications

جزئیات و درخواست

By Peter Eriksson
Publisher: Linköping University Electronic Press, 2019-08-29
Pages: 48
Language: en
ISBN_13:9789176850299
ISBN_10:9176850293

Catalysis By Ceria And Related Materials (2nd Edition)

جزئیات و درخواست

By Alessandro Trovarelli, Paolo Fornasiero
Publisher: World Scientific, 2013-04-30
Pages: 909
Language: en
ISBN_13:9781848169654
ISBN_10:1848169655
Subject: Science

Catalysis by Ceria and Related Materials

جزئیات و درخواست

By Alessandro Trovarelli, Paolo Fornasiero
Publisher: World Scientific, 2013
Pages: 909
Language: en
ISBN_13:9781848169647
ISBN_10:1848169647
Subject: Science

Chemistry of Silica and Zeolite-Based Materials

Synthesis, Characterization and Applications

جزئیات و درخواست

By Abderrazzak Douhal, Masakazu Anpo
Publisher: Elsevier, 2019-07-04
Pages: 464
Language: en
ISBN_13:9780128178140
ISBN_10:0128178140
Subject: Science

Probing and Tuning the Size, Morphology, Chemistry and Structure of Nanoscale Cerium Oxide

$Cerium oxide (ceria)-based materials in the nanoscale regime are of significant fundamental and technological interest. Nanoceria in pure and doped forms has current and potential use in solid oxide fuel cells, catalysis, UV- screening, chemical mechanical planarization, oxygen sensors, and bio-medical applications. The characteristic feature of Ce to switch between the +3 and +4 oxidation states renders oxygen buffering capability to ceria. The ease of this transformation was expected to be enhanced in the nanoceria. In most the practical scenarios, it is necessary to have a stable suspension of ceria nanoparticles (CNPs) over longer periods of time. However, the existing literature is confined to short term studies pertaining to synthesis and property evaluation. Having understood the need for a comprehensive understanding of the CNP suspensions, this dissertation is primarily aimed at understanding the behavior of CNPs in various chemical and physical environments. We have synthesized CNPs in the absence of any surfactants at room temperature and studied the aging characteristics. After gaining some understanding about the behavior of this functional oxide, the synthesis environment and aging temperature were varied, and their affects were carefully analyzed using various materials analysis techniques such as high resolution transmission electron microscopy (HRTEM), UV-Visible spectroscopy (UV-Vis), and X-ray photoelectron spectroscopy (XPS). When the CNPs were aged at room temperature in as-synthesized condition, they were observed to spontaneously assemble and evolve as fractal superoctahedral structures. The reasons for this unique polycrystalline morphology were attributed to the symmetry driven assembly of the individual truncated octahedral and octahedral seed of the ceria. HRTEM and Fast Fourier Transform (FFT) analyses were used to explain the agglomeration behavior and evolution of the octahedral morphology. Some of the observations were supported by molecular dynamic simulations. Poly (ethylene glycol) (PEG) and ethylene glycol (EG) were used to control the kinetics of this morphology evolution. The ability to control the agglomeration of CNPs in these media stems from the lower dielectric constant and an increased viscosity of the EG and PEG based solvents. CNPs when synthesized and aged in frozen conditions, i.e. in ice, were found to form one dimensional, high aspect ratio structures. A careful analysis has provided some evidence that the CNPs use the porous channels in ice as a template and undergo oriented attachment to form nanorods. When the aging treatment was done near freezing temperature in solution, the nanorods were not observed, confirming the role of channels in ice. When synthesized in aqueous media such as DI water, PEG and EG; CNPs were observed to exhibit a reversible oxidation state switching between +3 and +4. Band gap values were computed from the optical absorption data. The changes in the band gap values observed were attributed to the changes in the oxidation state of CNPs as opposed to the quantum confinement effects, as expected in other nanoparticle systems. The work presented in this dissertation demonstrates, with evidence, that in order to obtain a comprehensive understanding of the properties of nanoscale materials it is of paramount importance to monitor their behavior over relatively longer periods of time under various ambient environments. While the solution based techniques offer a versatility and low cost route to study the fundamental properties of nanomaterials, they suffer some inherent problems such as precursor contamination and uncontrolled chemical reactions. Especially when analyzing the behavior of ceria-based materials for applications like solid oxide fuel cells, a great control in the density and crystalline quality are desired. In order to achieve this, as a first step pure ceria thin films were synthesized using oxygen plasma assisted molecular beam epitaxy (OPA-MBE). The ceria films were analyzed using various in situ and ex situ techniques to study the crystal structure, growth mode and epitaxial quality of the films. It was observed that the epitaxial orientation of the ceria films could be tuned by varying the deposition rate. When the films were grown at low deposition rate ([less than]8 [angstrom]/min) ceria films with epitaxial (200) orientation were observed where as the films grown at high deposition rates (up to 30 [angstrom]/min) showed (111) orientation. Theoretical simulations were used to confirm some of the experimental facts observed in both nanoparticles and thin films.$

جزئیات و درخواست

By Satyanarayana V. N. T. Kuchibhatla
2008
Pages: 156
Language: en
OTHER:OCLC:300276447
Subject: Cerium oxides

Synthesis and Reactivity of Fluorescent Rare-earth Doped Cerium Oxide Nanomaterials

جزئیات و درخواست

By Anne Elizabeth D'Achille
2019
Pages: 236
Language: en
OTHER:OCLC:1112365383
Subject: Cerium oxides

Rare-Earth Metal Hexaborides: Synthesis, Properties, and Applications

$Rareearth hexaborides are a group of materials composed of octahedral boron units. They are useful for making advanced ceramics that have a wide range of industrial applications due to their low electronic work functions, hardness, refractory properties, low electrical resistances and specific thermal expansion coefficients. RareEarth Metal Hexaborides: Synthesis, Properties, and Applications provides a quick reference on rareearth metal hexaborides and their engineering applications. It provides a primer on rare earth elements followed by details of rareearth hexaboride structures, synthetic methods, and information about their alloys and ceramic composites. References to scholarly research are also provided for assisting advanced readers. This reference is a handy source of information for chemical engineering and materials science scholars, and anyone interested in the applied chemistry of rareearth metals and borides.$

جزئیات و درخواست

By Mikail Aslan, Cengiz Bozada
Publisher: Bentham Science Publishers, 2023-04-03
Pages: 136
Language: en
ISBN_13:9789815124583
ISBN_10:9815124587
Subject: Science

Cerium

Chemical Properties, Applications, and Environmental Impact

جزئیات و درخواست

By Nader Shehata
2017
Language: en
ISBN_10:1536124338
ISBN_13:9781536124330
Subject: Cerium

Nanozymology

Connecting Biology and Nanotechnology

جزئیات و درخواست

By Xiyun Yan
Publisher: Springer Nature, 2020-01-30
Pages: 564
Language: en
ISBN_13:9789811514906
ISBN_10:9811514909
Subject: Technology & Engineering

Synthesis And Applications In Chemistry And Materials (In 4 Volumes)

جزئیات و درخواست

By Armando J L Pombeiro, Kamran T Mahmudov, Maria De Fatima Costa Guedes Da Silva
Publisher: World Scientific, 2024-01-16
Pages: 2103
Language: en
ISBN_13:9789811279959
ISBN_10:9811279950
Subject: Science

Functional Nanomaterials

Synthesis, Properties, and Applications

جزئیات و درخواست

By Wai-Yeung Wong, Qingchen Dong
Publisher: John Wiley & Sons, 2022-06-06
Pages: 564
Language: en
ISBN_13:9783527828555
ISBN_10:3527828559
Subject: Science

Deep Eutectic Solvents

Synthesis, Properties, and Applications

جزئیات و درخواست

By Diego J. Ramón, Gabriela Guillena
Publisher: John Wiley & Sons, 2019-10-22
Pages: 465
Language: en
ISBN_13:9783527818495
ISBN_10:3527818499
Subject: Science

Functional Nanomaterials for Sensors

جزئیات و درخواست

By Suresh Sagadevan, Won-Chun Oh
Publisher: CRC Press, 2023-05-02
Pages: 338
Language: en
ISBN_13:9781000871722
ISBN_10:100087172X
Subject: Technology & Engineering

Nanostructured Cerium Oxide Based Catalysts

Synthesis, Physical Properties, and Catalytic Performance

جزئیات و درخواست

By Yunyun Zhou
2015
Pages: 211
Language: en
ISBN_10:1321978480
ISBN_13:9781321978483

Cerium Oxide Nanostructures and Their Applications

جزئیات و درخواست

By Adnan Younis
2016
Language: en
OTHER:OCLC:1154255629
Subject: Science

Handbook on the Physics and Chemistry of Rare Earths

Including Actinides

جزئیات و درخواست

Publisher: Elsevier, 2016-10-31
Pages: 482
Language: en
ISBN_13:9780444638526
ISBN_10:0444638520
Subject: Science

Applications of Metal-Organic Frameworks and Their Derived Materials

جزئیات و درخواست

By Inamuddin, Rajender Boddula, Mohd Imran Ahamed, Abdullah M. Asiri
Publisher: John Wiley & Sons, 2020-04-23
Pages: 496
Language: en
ISBN_13:9781119651161
ISBN_10:1119651166
Subject: Science

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