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Articles de revues sur le sujet "Metal Phosphate Porous Materials"

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Podgorbunsky, Anatoly B., O. O. Shichalin et S. V. Gnedenkov. « Composite Materials Based on Magnesium and Calcium Phosphate Compounds ». Materials Science Forum 992 (mai 2020) : 796–801. http://dx.doi.org/10.4028/www.scientific.net/msf.992.796.

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This paper presents the process and results of the formation of multifunctional materials based on magnesium for the needs of implant surgery. An integrated approach has been developed, including: (i) the synthesis of porous magnesium preforms by means of a powder metallurgical process; (ii) formation of composites based on synthesized nanoscale hydroxyapatite powder and magnesium metal powder by spark plasma sintering technology.
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Shablovski, Vladimir, Alla Tuchkoskaya, Vladimir Rukhlya, Olga Pap et Kateryna Kudelko. « THE STUDY OF THE SORPTION PROPERTIES OF FILTERING MATERIALS BASED ON TITANIUM PHOSPHATE - POROUS TITANIUM COMPOSITION ». WATER AND WATER PURIFICATION TECHNOLOGIES. SCIENTIFIC AND TECHNICAL NEWS 31, no 3 (22 décembre 2021) : 19–25. http://dx.doi.org/10.20535/2218-930032021244507.

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Inorganic sorbents are more selective in comparison with commercial ion exchange resins towards of metal ions. However, inorganic sorbents characterized not high kinetic properties. One of the way to increase the kinetic rate of inorganic sorbents is to reduce the particle size of these materials, other way is synthesizing inorganic sorbents as porous products from powder materials. A sample of such inorganic sorbents is titanium phosphate of various compositions. Studying the properties of microfilters based on composition titanium phosphate - porous titanium has been developed. The sorbents based on acidic titanium phosphate Ti(HPO4)2∙H2O were used for filtering solution with Fe(II) content. It is found that the number of impregnations with inorganic sorbent modificator is important and influence filtration process. The obtained results demonstrated that after the first impregnation of porous material with a smaller pore size, it is possible to obtain such sorbent as a mass content of powder material. By varying the ionic form of titanium phosphate, the porosity of titanium, the amount of impregnation, it could be possible effect on the sorption Fe(II). The sorption properties of titanium-titanium phosphate microfilters were studied by potentiometric titration in the NaCl-NaOH system, as well as the sorption of Fe2+ ions. The degree of purification for Fe(II) from solution with a concentration of 10 mg/l is 64 %. Application an electric potential to the microfilter of porous titanium - phosphate titanium increases the degree of purification of Fe(II) to 88 %.
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Han, Ruo Bing, Chun Lei Wan, Hui Wu et Wei Pan. « An Original Process of Nanoporous Materials via Templating Nickel Phosphate Colloidal Particles ». Key Engineering Materials 368-372 (février 2008) : 1706–8. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1706.

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A novel templating method for preparing nanoporous materials has been developed. Spherical nickel phosphate particles synthesized through a homogeneous precipitation method were used as templates after annealing to fabricate porous metals. Effort of annealing temperature on the morphology of the spherical particles and the structure of outcome materials were studied. Hierarchical nanoporous metal with a high surface area was obtained using a template annealed at 200 oC.
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Rokosz, Krzysztof, Tadeusz Hryniewicz, Steinar Raaen, Sofia Gaiaschi, Patrick Chapon, Dalibor Matýsek, Kornel Pietrzak, Monika Szymańska et Łukasz Dudek. « Metal Ions Supported Porous Coatings by Using AC Plasma Electrolytic Oxidation Processing ». Materials 13, no 17 (31 août 2020) : 3838. http://dx.doi.org/10.3390/ma13173838.

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Coatings enriched with zinc and copper as well as calcium or magnesium, fabricated on titanium substrate by Plasma Electrolytic Oxidation (PEO) under AC conditions (two cathodic voltages, i.e., −35 or −135 V, and anodic voltage of +400 V), were investigated. In all experiments, the electrolytes were based on concentrated orthophosphoric acid (85 wt%) and zinc, copper, calcium and/or magnesium nitrates. It was found that the introduced calcium and magnesium were in the ranges 5.0–5.4 at% and 5.6–6.5 at%, respectively, while the zinc and copper amounts were in the range of 0.3–0.6 at%. Additionally, it was noted that the metals of the block S (Ca and Mg) could be incorporated into the structure about 13 times more than metals of the transition group (Zn and Cu). The incorporated metals (from the electrolyte) into the top-layer of PEO phosphate coatings were on their first (Cu+) or second (Cu2+, Ca2+ and Mg2+) oxidation states. The crystalline phases (TiO and Ti3O) were detected only in coatings fabricated at cathodic voltage of −135 V. It has also been pointed that fabricated porous calcium–phosphate coatings enriched with biocompatible magnesium as well as with antibacterial zinc and copper are dedicated mainly to medical applications. However, their use for other applications (e.g., catalysis and photocatalysis) after additional functionalizations is not excluded.
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Nandi, Mahasweta, Asim Bhaumik et Nawal K. Mal. « From Porous Metal Phosphates to Oxophenylphosphates : A Review ». Recent Patents on Materials Science 3, no 2 (23 avril 2010) : 151–66. http://dx.doi.org/10.2174/1874465611003020151.

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Liao, Chwen-Haw, Kun Fan, Song-Song Bao, Hao Fan, Xi-Zhang Wang, Zheng Hu, Mohamedally Kurmoo et Li-Min Zheng. « From a layered iridium(iii)–cobalt(ii) organophosphonate to an efficient oxygen-evolution-reaction electrocatalyst ». Chemical Communications 55, no 92 (2019) : 13920–23. http://dx.doi.org/10.1039/c9cc06164a.

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Porous layered iridium–cobalt MOF CoII2[IrIII(ppy-COOH)2(ppy-COO)]2(HOCH2PO3)·12H2O·2.5DMF, calcined under oxygen provides homogeneously distributed metal oxides and phosphate showing efficient catalytic properties for the OER.
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Cutrone, Li, Casas-Solvas, Menendez-Miranda, Qiu, Benkovics, Constantin et al. « Design of Engineered Cyclodextrin Derivatives for Spontaneous Coating of Highly Porous Metal-Organic Framework Nanoparticles in Aqueous Media ». Nanomaterials 9, no 8 (1 août 2019) : 1103. http://dx.doi.org/10.3390/nano9081103.

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Nanosized metal-organic frameworks (nanoMOFs) MIL-100(Fe) are highly porous and biodegradable materials that have emerged as promising drug nanocarriers. A challenging issue concerns their surface functionalization in order to evade the immune system and to provide molecular recognition ability, so that they can be used for specific targeting. A convenient method for their coating with tetraethylene glycol, polyethylene glycol, and mannose residues is reported herein. The method consists of the organic solvent-free self-assembly on the nanoMOFs of building blocks based on β-cyclodextrin facially derivatized with the referred functional moieties, and multiple phosphate groups to anchor to the nanoparticles’ surface. The coating of nanoMOFs with cyclodextrin phosphate without further functional groups led to a significant decrease of macrophage uptake, slightly improved by polyethylene glycol or mannose-containing cyclodextrin phosphate coating. More notably, nanoMOFs modified with tetraethylene glycol-containing cyclodextrin phosphate displayed the most efficient “stealth” effect. Mannose-coated nanoMOFs displayed a remarkably enhanced binding affinity towards a specific mannose receptor, such as Concanavalin A, due to the multivalent display of the monosaccharide, as well as reduced macrophage internalization. Coating with tetraethylente glycol of nanoMOFs after loading with doxorubicin is also described. Therefore, phosphorylated cyclodextrins offer a versatile platform to coat nanoMOFs in an organic solvent-free, one step manner, providing them with new biorecognition and/or “stealth” properties.
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Lee, Sanghan, et Jaephil Cho. « Stacked porous tin phosphate nanodisk anodes ». Chemical Communications 46, no 14 (2010) : 2444. http://dx.doi.org/10.1039/b924381j.

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Spriano, Silvia, Anna Dmitruk, Krzysztof Naplocha et Sara Ferraris. « Tannic Acid Coatings to Control the Degradation of AZ91 Mg Alloy Porous Structures ». Metals 13, no 2 (19 janvier 2023) : 200. http://dx.doi.org/10.3390/met13020200.

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Porous structures of magnesium alloys are promising bioimplants due to their biocompatibility and biodegradability. However, their degradation is too rapid compared to tissue regeneration and does not allow a progressive metal substitution with the new biological tissue. Moreover, rapid degradation is connected to an accelerated ion release, hydrogen development, and pH increase, which are often causes of tissue inflammation. In the present research, a natural organic coating based on tannic acid was obtained on Mg AZ91 porous structures without toxic reagents. Mg AZ91 porous structures have been prepared by the innovative combination of 3D printing and investment casting, allowing fully customized objects to be produced. Bare and coated samples were characterized using scanning electron microscopy equipped with energy dispersive spectroscopy (SEM-EDS), fluorescence microscopy, Fourier transformed infrared spectroscopy (FTIR), tape adhesion test, Folin–Ciocalteu, and degradation tests. Different parameters (solvent, dipping time) were compared to optimize the coating process. The optimized coating was uniform on the outer and inner surfaces of the porous structures and significantly reduced the material degradation rate and pH increase in physiological conditions (phosphate-buffered saline—PBS).
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Medvecky, Lubomir, Radoslava Stulajterova, Maria Giretova, Tibor Sopcak, Maria Faberova, Miroslav Hnatko et Tatana Fenclova. « Calcium Phosphate Cement Modified with Silicon Nitride/Tricalcium Phosphate Microgranules ». Powder Metallurgy Progress 20, no 1 (1 juin 2020) : 56–75. http://dx.doi.org/10.2478/pmp-2020-0006.

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Abstract Tetracalcium phosphate/monetite biocement was modified with 10 and 30 wt. % addition of highly porous silicon nitride/α-tricalcium phosphate (αTCP) microgranules with various content of αTCP. A composite cement powder mixture was prepared using mechanical homogenization of basic components. The accelerated release of dexamethasone from composite cement was revealed, which indicates their possible utilization for controlled drug release. The wet compressive strength of cements (<17 MPa) was significantly reduced (more than 30%) in comparison with the unmodified cement and both compressive strength and setting time were influenced by the content of αTCP in microgranules. The addition of microgranules caused a 20% decrease in final cement density. Microgranules with a higher fraction of αTCP showed good in vitro SBF bioactivity with precipitation of hydroxyapatite particles. Microstructure analysis of fractured cements demonstrated excellent interconnection between microgranules and cement calcium phosphate matrix, but also showed lower mechanical strength of microgranule cores.
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Thèses sur le sujet "Metal Phosphate Porous Materials"

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Yang, Zhu. « Preparation and Application of Hierarchically Porous Monolithic Materials with Embedded Nanoscale Interfaces ». 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215332.

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Wharmby, Michael T. « Synthesis of porous metal phosphonate frameworks for applications in gas separation and storage ». Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3450.

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Porous metal phosphonate framework materials were synthesised by solvothermal reaction of bis(α-aminomethylenephosphonic acid) ligands with divalent and trivalent metal cations. The syntheses and characterisation by NMR and, where possible, single crystal X-ray diffraction of seven bisphosphonic acid ligands, including N,N′-piperazinebis(methylenephosphonic acid) (H₄L), its racemic and enantiopure (R) 2-methyl (H₄L′ and R-H₄L′) and 2,5-dimethyl (H₄L′′) derivatives, and N,N′-4,4′-bipiperidinebis(methylenephosphonic acid) (H₄LL) are reported. Syntheses of the known phase Y₂(LH₂)₃·5H₂O and the new phases, STA-13(Y) (St Andrews microporous material No. 13) and Y₂(R-L′H₂)₃·4H₂O, from reactions of Y(AcO)₃ with H₄L, H₄L′ and R-H₄L′ respectively are reported. The as-prepared and dehydrated structures of each phase have been determined from either laboratory or synchrotron powder X-ray diffraction data. Reaction of Y(AcO)₃ and H₄L′′ is shown to form a phase with a different structure. The features determining which structure crystallises are discussed. Syntheses of other rare-earth forms of STA-13 (Sc³⁺, Gd³⁺–Yb³⁺) and the porosity of each phase to N₂ are reported. STA-13(Y) is the most porous form with loadings of ∼3 mmol g⁻¹ and ∼4 mmol g⁻¹ for N₂ and CO₂ respectively. MIL-91(Fe) was synthesised for the first time from reactions of Fe³⁺ cations with H₄L. Its structure was confirmed by Rietveld refinement, but it was not porous. The first syntheses of [Fe₄L₁.₅(AcO)₁.₅(OH,H₂O)₃]·0.5NH₄5.5H₂O (L= L or L′) are reported, from reactions of H₄L or H₄L′ in the presence of an excess of Fe³⁺ cations. The phase is related to a previously reported Co phase. The synthesis of divalent metal bisphosphonate STA-12(Mg) (Mg₂(H₂O)₂L·5.6H₂O) was reported for the first time and its structure determined from single crystal X-ray diffraction. The dehydration behaviour of this material was compared with the known forms of STA-12. STA-12(Mg) is porous to both N₂ (∼5.5 mmol g⁻¹) and CO₂ (~ 8.5 mmol g⁻¹). Reaction of H₄LL with Co²⁺ and Ni²⁺ gave two materials isoreticular with STA-12, labelled STA-16(Co) and STA-16(Ni). The structures of both materials were solved from synchrotron powder X-ray diffraction data. On dehydration, STA-16(Co) undergoes a reversible structural transition to an unknown structure. By contrast, STA-16(Ni) retains the same symmetry in the dehydrated form and its structure was determined from synchrotron powder X-ray diffraction data. Both materials are porous to N₂, with an uptake of up to 22.2 mmol g⁻¹, and CO₂ with maximum loading of 21.7 mmol g⁻¹. NLDFT analysis of N₂ adsorption data confirm the crystallographically determined pore radii. Syntheses of other frameworks with divalent cations and initial reactions of H₄LL with trivalent cations are also reported.
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Su, Zixue. « Porous anodic metal oxides ». Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/1019.

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An equifield strength model has been established to elucidate the formation mechanism for the highly ordered alumina pore arrays and titanium oxide nanotubular arrays prepared via a common electrochemical methodology, anodisation. The fundamentals of the equifield strength model was the equilibrium between the electric field driven oxidation rate of the metal and electric field enhanced dissolution rate of oxide. During the anodic oxidation of metal, pore initiation was believed to generate based on dissolution rate difference caused by inhomogeneity near the metal/oxide interface. The ionic nanoconvection driven by the electric force exerted on the space charge layer in the vicinity of electrolyte/oxide interface is established to be the main driving force of the pore ordering at the early stage of the anodisation. While the equifield strength requirement governs the following formation of the single pore and the self-ordering of random distributed pore arrays during the anodisation process. Hexagonal patterned Al2O3 nanopore arrays and TiO2 nanotubular arrays have been achieved by anodisation of corresponding metal substrates in proper electrolytes. The two characteristic microstructural features of anodic aluminium oxide (AAO) and anodic titanium oxide (ATO) were investigated using scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). The observations of the hemispherical electrolyte/oxide and oxide/metal interfaces, uniform thickness of the oxide layer, as well as self-adjustment of the pore size and pore ordering can be well explained by the equifield strength model. Field enhanced dissociation of water is extremely important in determination of the porosity of anodic metal oxide. The porosity of AAO and ATO films was found to be governed by the relative dissociation rate of water which is dependent on anodisation conditions, such as electrolyte, applied voltage, current density and electric field strength. Using an empirical method, the relations between the porosity of the AAO (ATO) films and the anodisation parameters, such as electric field strength, current density and applied voltage, have been established. Besides, the extent that an external electric field can facilitate the heterolytic dissociation of water molecule has been estimated using quantum-chemical model computations combined with the experimental aspect. With these achievements, the fabrication of anodic metal oxide films can be understood and controlled more precisely. Additionally, the impacts of other factors such as the electrolyte type and the temperature effect on the morphology of the anodic products were also investigated. Some important experimental evidences on the pore diameters variation with applied voltage in the anodisation of aluminium and the titanium were obtained for future investigation of the anodic metal oxide formation processes.
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Zheng, Yu 1970. « Modelling of solidification of porous metal-hydrogen alloys ». Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37004.

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Taksande, Kiran. « Exploration of the Ionic Conduction Properties of Porous MOF Materials ». Thesis, Université de Montpellier (2022-….), 2022. http://www.theses.fr/2022UMONS010.

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Ce travail a pour objectif l’étude de matériaux hybrides poreux de type Metal-Organic Frameworks (MOFs) et d’un cristal moléculaire en tant que conducteurs ioniques solides pour des applications dans le domaine de l’énergie et de l’environnement. Dans le premier cas, nous avons développé diverses stratégies pour optimiser et contrôler la teneur en sites acides de Lewis et en porteurs de charges de deux séries de MOFs afin de concevoir des matériaux aux propriétés de conduction protonique très prometteuses. A partir d’une approche basée sur la substitution progressive des ligands par des entités fonctionnalisées présentant des sources de protons acides, nous avons créé une série de MOFs, MIP-207-(SO3H-IPA)x-(BTC)1–x, dont la teneur en groupements sulfoniques, par l’intermédiaire du ligand SO3H-IPA, est contrôlée à façon. Le meilleur matériau qui combine stabilité structurale et conduction protonique élevée présente des performances sous humidité parmi les plus intéressantes au sein de la famille des MOFs conducteurs protoniques (e.g., σ = 2.6 × 10–2 S cm–1 à 363 K/95% d’humidité relative (RH)). Selon une autre approche, nous avons étudié un MOF mésoporeux connu (MIL-101(Cr)-SO3H) dont les parois des pores sont tapissées de sites protoniques et qui contient dans ses pores un liquide ionique, le chlorure chlorure de 1-Ethyl-3-methylimidazolium (EMIMCl) capable d’assurer le transfert de proton. L’encapsulation du liquide ionique, caractérisée par une série d’outils expérimentaux (sorption de diazote, DRX sur poudre, TGA/MS, DSC et analyse élémentaire), s’avère particulièrement efficace pour exalter les propriétés de conduction protonique des composites à la fois à l’état anhydre (σ473 K = 1.5 × 10-3 S cm-1) mais également à l’état hydraté (σ(343 K/60%-80%RH) ≥ 0.10 S cm-1). Enfin, ce travail a été étendu à une autre famille de solides poreux, à travers l’étude des propriétés de conduction ionique d’un cristal moléculaire à base de zirconium (Zr-3) qui contient des paires ioniques KCl. Nous avons démontré que ZF-3 transite d’un comportement isolant à l’état anhydre (σ = 5.1 x 10-10 S cm-1 à 363 K/0% RH) vers un comportement super-conducteur ionique en présence d’eau (σ = 5.2 x 10-2 S cm-1 à 363 K/95 % RH), suite à l’augmentation de la dynamique de ions Cl- sous hydratation. Par ailleurs, des simulations moléculaires ont permis de décrire les mécanismes microscopiques à l’origine des propriétés de conduction des matériaux étudiés. Ces avancées devraient permettre de développer dans le futur de nouveaux matériaux performants dans le domaine de la conduction protonique et ionique
The conductivity performance of a new series of chemically stable proton conducting Metal Organic Frameworks (MOFs) as well as a superionic molecular crystal was explored. The contribution of this PhD was to (i) select a variety of architectures and functionalities of robust MOFs/superionic molecular solids and (ii) characterize and rationalize their conducting performance over various temperature/humidity conditions. We designed two series of MOFs to achieve promising proton-conducting performance, using distinct approaches to modulate the concentration of Brønsted acidic sites and charge carriers and further boost the conductivity properties. First, a multicomponent ligand replacement strategy was successfully employed to elaborate a series of multivariate sulfonic-based solids MIP-207-(SO3H-IPA)x-(BTC)1–x which combine structural integrity with high proton conductivity values (e.g., σ = 2.6 × 10–2 S cm–1 at 363 K/95% Relative Humidity -RH-). Secondly, a proton conducting composite was prepared through the impregnation of an ionic liquid (1-Ethyl-3-methylimidazolium chloride, EMIMCl) in the mesoporous MIL-101(Cr)-SO3H. The resulting composite displaying high thermal and chemical stability, exhibits outstanding proton conductivity not only at the anhydrous state (σ473 K = 1.5 × 10-3 S cm-1) but also under humidity (σ(343 K/60%-80%RH) ≥ 0.10 S cm-1) conditions. Finally, the ionic conducting properties of another class of porous solids, considering a zirconium-formate molecular solid containing KCl ion pairs (ZF-3) were explored. ZF-3 switches from an insulator (σ = 5.1 x 10-10 S cm-1 at 363 K/0% RH) to a superionic conductor upon hydration (σ = 5.2 x 10-2 S cm-1 at 363 K/95 % RH), in relation with the boost of Cl- dynamics upon water adsorption. Noteworthy, quantum- and force-field based simulations were combined with the experimental approach to elucidate the microscopic mechanisms at the origin of the ionic conducting properties of the studied materials. This fundamental knowledge will serve to create novel robust superionic conductors with outstanding performances that will pave the way towards appealing societal applications for clean energy production
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Mu, Bin. « Synthesis and gas adsorption study of porous metal-organic framework materials ». Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41097.

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Metal-organic frameworks (MOFs) or porous coordination polymers (PCPs) have become the focus of intense study over the past decade due to their potential for advancing a variety of applications including air purification, gas storage, adsorption separations, catalysis, gas sensing, drug delivery, and so on. These materials have some distinct advantages over traditional porous materials such as the well-defined structures, uniform pore sizes, chemically functionalized sorption sites, and potential for post-synthetic modification, etc. Thus, synthesis and adsorption studies of porous MOFs have increased substantially in recent years. Among various prospective applications, air purification is one of the most immediate concerns, which has urgent requirements to improve current nuclear, biological, and chemical (NBC) filters involving commercial and military purposes. Thus, the major goal of this funded project is to search, synthesize, and test these novel hybrid porous materials for adsorptive removal of toxic industrial chemicals (TICs) and chemical warfare agents (CWAs), and to install the benchmark for new-generation NBC filters. The objective of this study is three-fold: (i) Advance our understanding of coordination chemistry by synthesizing novel MOFs and characterizing these porous coordination polymers; (ii) Evaluate porous MOF materials for gas-adsorption applications including CO2 capture, CH4 storage, other light gas adsorption and separations, and examine the chemical and physical properties of these solid adsorbents including thermal stability and heat capacity of MOFs; (iii) Evaluate porous MOF materials for next-generation NBC filter media by adsorption breakthrough measurements of TICs on MOFs, and advance our understanding about structure-property relationships of these novel adsorbents.
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Zhao, Yue. « Preparation and investigation of group 13 metal organo-phosphate hybrid-framework materials ». Winston-Salem, NC : Wake Forest University, 2009. http://dspace.zsr.wfu.edu/jspui/handle/10339/42608.

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Thesis (Ph.D.)--Wake Forest University. Dept. of Chemistry, 2009.
Title from electronic thesis title page. Thesis advisor: Abdessadek Lachgar. Vita. Includes bibliographical references (p. 140-156).
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Mochizuki, Shuto. « Controlled radical polymerization in designed porous materials ». Kyoto University, 2019. http://hdl.handle.net/2433/242535.

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Annamalai, Perushini. « Electrospinning of porous composite materials for hydrogen storage application ». University of the Western Cape, 2016. http://hdl.handle.net/11394/5654.

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>Magister Scientiae - MSc
Due to the rapid depletion of fossil fuel reserves and the production of environmentally harmful by-products such as carbon dioxide, there is an urgent need for alternate sustainable clean energy. One of the leading candidates in this endeavour is hydrogen, which can be used as an energy carrier since it has a high energy density, zero emissions and is produced from non-depletable resources such as water. The major challenge hindering a hydrogen economy is the lack of safe and effective storage technologies for mobile applications. A prospective solution to this problem lies in the use of porous powdered materials, which adsorb the hydrogen gas. However, the integration of these powdered materials into a storage tank system, results in the pipelines being contaminated during filling cycles. This necessitates the shaping of the porous powdered materials. Among the many shaping techniques available, the electrospinning technique has been proposed as a promising technology since it is a versatile process that is easily scaled-up making it attractive for the applications of the study. Furthermore, the electrospinning process enables the synthesis of nano-sized fibres with attractive hydrogen sorption characteristics. In this regard, the current study employs the electrospinning technique to synthesise electrospun composite fibres for mobile hydrogen storage applications. After electrospinning three polymers, polyacrylonitrile (PAN) was selected as the most suitable polymer because it yielded bead-free electrospun fibres. However, the diameter of the PAN fibres was large/thick which prompted further optimisation of the electrospinning parameters. The optimised electrospinning conditions that yield unbeaded fibres within the desired diameter range (of 300-500 nm) were a PAN concentration of 10 wt%, a flow rate of 0.4 mL/h, a distance of 10 cm between the needle tip and collector plate, and an applied voltage of 8 kV. The study then progressed to the synthesis and characterisation of the pristine porous powdered materials which adsorb hydrogen gas. The porous powdered materials investigated were commercial zeolite 13X, its synthesised templated carbon derivative (ZTC) and Zr (UiO-66) and Cr (MIL-101) based metal-organic frameworks (MOFs). ZTC was synthesised via liquid impregnation coupled with chemical vapour deposition (CVD), and the MOFs were synthesised by the modulated solvothermal method. Analysis of the ZTCs morphology and phase crystallinity show that the carbon templated process using zeolites was successful, however, ZTC was amorphous compared to crystalline zeolite template. The BET surface area was assessed with the aid of nitrogen sorption isotherms for both zeolite 13X and ZTC, and values of 730 and 2717 m²/g, respectively were obtained. The hydrogen adsorption capacity for zeolite 13X was 1.6 wt% and increased to 2.4 wt% in the ZTC material at 77 K and 1 bar. The successful synthesis of well defined, crystalline MOFs was evident from X-ray diffraction and morphological analysis. The BET surface area and hydrogen adsorption for Zr MOF were 1186 m²/g and 1.5 wt%, respectively at 77 K and 1 bar. Cr MOF had a BET surface area of 2618 m²/g and hydrogen adsorption capacity of 1.9 wt% at 77 K and 1 bar. The main focus of the study was to synthesise electrospun composite fibres that can adsorb hydrogen gas and thus provide significant insight in this field of research. As such it examined composite fibres that incorporates porous powdered materials such as zeolite 13X, ZTCs, UiO-66 (Zr) MOF and MIL-101 (Cr) MOF and investigated their ability to adsorb hydrogen gas, which have not been reported previously. The synthesis of composite fibres was achieved by incorporating the porous powdered materials into the PAN resulting in a polymeric blend that was then electrospun. Morphological analysis illustrated that the porous powdered materials were successfully supported by or incorporated within the PAN fibres, forming composite fibres. The BET surface area of the 40 wt% zeolite-PAN and 12.5 wt% ZTC-PAN composite fibres were 440 and 1787 m²/g respectively. Zr MOF and Cr MOF composite fibres had a BET surface area of 815 and 1134 m²/g, respectively. The BET surface area had reduced by 40, 34, 31 and 57% for zeolite 13X, ZTC, Zr MOF and Cr MOF, respectively after these porous powdered materials were incorporated into PAN. The hydrogen adoption capacity for 40 wt% zeolite-PAN, 12.5 wt% ZTC-PAN, 20 wt% Zr MOFPAN and 20 wt% Cr MOF-PAN composite fibres was 0.8, 1.8, 0.9 and 1.1 wt%, respectively. This decrease was attributed to the limited amount of porous powdered materials that could be incorporated into the fibres since only 40 wt% of zeolite 13X, 12.5 wt% of ZTC and 20 wt% of the MOFs were loaded into their respective composite fibres. This was due to the fact that incorporation of greater amounts of porous powdered materials resulted in a viscous polymeric blend that was unable to be electrospun. It is evident from the study that electrospinning is a versatile process that is able to produce composite fibres with promising properties that can potentially advance the research in this field thus providing a practical solution to the problem of integrating loose powdered materials into an on-board hydrogen storage system.
CSIR Young Researchers Establishment Fund (YREF)
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Taksande, Kiran. « Exploration of the Ionic Conduction Properties of Porous MOF Materials ». Thesis, Montpellier, 2022. https://ged.scdi-montpellier.fr/florabium/jsp/nnt.jsp?nnt=2022UMONS010.

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Ce travail a pour objectif l’étude de matériaux hybrides poreux de type Metal-Organic Frameworks (MOFs) et d’un cristal moléculaire en tant que conducteurs ioniques solides pour des applications dans le domaine de l’énergie et de l’environnement. Dans le premier cas, nous avons développé diverses stratégies pour optimiser et contrôler la teneur en sites acides de Lewis et en porteurs de charges de deux séries de MOFs afin de concevoir des matériaux aux propriétés de conduction protonique très prometteuses. A partir d’une approche basée sur la substitution progressive des ligands par des entités fonctionnalisées présentant des sources de protons acides, nous avons créé une série de MOFs, MIP-207-(SO3H-IPA)x-(BTC)1–x, dont la teneur en groupements sulfoniques, par l’intermédiaire du ligand SO3H-IPA, est contrôlée à façon. Le meilleur matériau qui combine stabilité structurale et conduction protonique élevée présente des performances sous humidité parmi les plus intéressantes au sein de la famille des MOFs conducteurs protoniques (e.g., σ = 2.6 × 10–2 S cm–1 à 363 K/95% d’humidité relative (RH)). Selon une autre approche, nous avons étudié un MOF mésoporeux connu (MIL-101(Cr)-SO3H) dont les parois des pores sont tapissées de sites protoniques et qui contient dans ses pores un liquide ionique, le chlorure chlorure de 1-Ethyl-3-methylimidazolium (EMIMCl) capable d’assurer le transfert de proton. L’encapsulation du liquide ionique, caractérisée par une série d’outils expérimentaux (sorption de diazote, DRX sur poudre, TGA/MS, DSC et analyse élémentaire), s’avère particulièrement efficace pour exalter les propriétés de conduction protonique des composites à la fois à l’état anhydre (σ473 K = 1.5 × 10-3 S cm-1) mais également à l’état hydraté (σ(343 K/60%-80%RH) ≥ 0.10 S cm-1). Enfin, ce travail a été étendu à une autre famille de solides poreux, à travers l’étude des propriétés de conduction ionique d’un cristal moléculaire à base de zirconium (Zr-3) qui contient des paires ioniques KCl. Nous avons démontré que ZF-3 transite d’un comportement isolant à l’état anhydre (σ = 5.1 x 10-10 S cm-1 à 363 K/0% RH) vers un comportement super-conducteur ionique en présence d’eau (σ = 5.2 x 10-2 S cm-1 à 363 K/95 % RH), suite à l’augmentation de la dynamique de ions Cl- sous hydratation. Par ailleurs, des simulations moléculaires ont permis de décrire les mécanismes microscopiques à l’origine des propriétés de conduction des matériaux étudiés. Ces avancées devraient permettre de développer dans le futur de nouveaux matériaux performants dans le domaine de la conduction protonique et ionique
The conductivity performance of a new series of chemically stable proton conducting Metal Organic Frameworks (MOFs) as well as a superionic molecular crystal was explored. The contribution of this PhD was to (i) select a variety of architectures and functionalities of robust MOFs/superionic molecular solids and (ii) characterize and rationalize their conducting performance over various temperature/humidity conditions. We designed two series of MOFs to achieve promising proton-conducting performance, using distinct approaches to modulate the concentration of Brønsted acidic sites and charge carriers and further boost the conductivity properties. First, a multicomponent ligand replacement strategy was successfully employed to elaborate a series of multivariate sulfonic-based solids MIP-207-(SO3H-IPA)x-(BTC)1–x which combine structural integrity with high proton conductivity values (e.g., σ = 2.6 × 10–2 S cm–1 at 363 K/95% Relative Humidity -RH-). Secondly, a proton conducting composite was prepared through the impregnation of an ionic liquid (1-Ethyl-3-methylimidazolium chloride, EMIMCl) in the mesoporous MIL-101(Cr)-SO3H. The resulting composite displaying high thermal and chemical stability, exhibits outstanding proton conductivity not only at the anhydrous state (σ473 K = 1.5 × 10-3 S cm-1) but also under humidity (σ(343 K/60%-80%RH) ≥ 0.10 S cm-1) conditions. Finally, the ionic conducting properties of another class of porous solids, considering a zirconium-formate molecular solid containing KCl ion pairs (ZF-3) were explored. ZF-3 switches from an insulator (σ = 5.1 x 10-10 S cm-1 at 363 K/0% RH) to a superionic conductor upon hydration (σ = 5.2 x 10-2 S cm-1 at 363 K/95 % RH), in relation with the boost of Cl- dynamics upon water adsorption. Noteworthy, quantum- and force-field based simulations were combined with the experimental approach to elucidate the microscopic mechanisms at the origin of the ionic conducting properties of the studied materials. This fundamental knowledge will serve to create novel robust superionic conductors with outstanding performances that will pave the way towards appealing societal applications for clean energy production
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Livres sur le sujet "Metal Phosphate Porous Materials"

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1936-, Unger Klaus Konradin, et International Union of Pure and Applied Chemistry., dir. Characterization of porous solids. Amsterdam : Elsevier, 1988.

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Smått, Jan-Henrik. Hierarchically porous silica, carbon, and metal oxide monoliths : Synthesis and characterization. Turku : Åbo Akademi University, 2005.

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MacGillivray, Leonard. Metal-organic frameworks : Design and application. Hoboken, N.J : Wiley, 2010.

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Gultekin, Goller, et United States. National Aeronautics and Space Administration., dir. Wear and friction behavior of metal impregnated microporous carbon composites. [Washington, D.C : National Aeronautics and Space Administration, 1997.

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Leonard, MacGillivray, dir. Metal-organic frameworks : Design and application. Hoboken, N.J : Wiley, 2010.

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Metal-organic frameworks : Applications from catalysis to gas storage. Weinheim : Wiley-VCH, 2011.

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service), SpringerLink (Online, dir. Functional Metal-Organic Frameworks : Gas Storage, Separation and Catalysis. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010.

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Claudio, Morterra, Zecchina Adriano 1936-, Costa Giacomo 1922- et Associazione italiana di chimica fisica., dir. Structure and reactivity of surfaces : Proceedings of a European conference, Trieste, Italy, September 13-16, 1988. Amsterdam : Elsevier, 1989.

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Blay, Vincent, Luis Francisco Bobadilla et Alejandro Cabrera, dir. Zeolites and Metal-Organic Frameworks. NL Amsterdam : Amsterdam University Press, 2018. http://dx.doi.org/10.5117/9789462985568.

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Zeolites are natural or synthetic materials with porous chemical structures that are valuable due to their absorptive and catalytic qualities. Metal-Organic Frameworks (MOFs) are manmade organometallic polymers with similar porous structures. This introductory book, with contributions from top-class researchers from all around the world, examines these materials and explains the different synthetic routes available to prepare zeolites and MOFs. The book also highlights how the substances are similar yet different and how they are used by science and industry in situations ranging from fueling cars to producing drugs.
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Kapustin, Vladimir, Aleksandr Sigov, Illarion Li et Vladimir Mel'nikov. Point defects in oxides and emission properties. ru : INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1846464.

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The monograph discusses the influence of point defects in oxides, which are the main emission component of cathodes of electrovacuum microwave devices, on their emission properties. The theory of electron emission of oxides, analytical methods for studying cathodes, methods for studying their emission properties are described. The issues of the theory and physicochemistry of nickel-oxide, metal-porous, metal-alloy and yttrium oxide cathodes, including cathodes for cold-start magnetrons, are considered in detail. It is intended for scientific and engineering workers specializing in the field of electronic materials science and electronic devices. It can also serve as a textbook useful for teachers, graduate students, undergraduates, undergraduates of the corresponding physical-technical and natural-scientific specialties.
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Chapitres de livres sur le sujet "Metal Phosphate Porous Materials"

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Azhar, Umair, Muhammad S. Bashir, Muhammad Arif et Muhammad Sagir. « Hierarchically Porous Metal Phosphates and Phosphonates : Emerging Materials Toward Advance Applications ». Dans Metal Phosphates and Phosphonates, 21–40. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27062-8_2.

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Kepert, Cameron J. « Metal-Organic Framework Materials ». Dans Porous Materials, 1–67. Chichester, UK : John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9780470711385.ch1.

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Sadakane, Masahiro, et Wataru Ueda. « Ordered Porous Crystalline Transition Metal Oxides ». Dans Porous Materials, 147–215. Chichester, UK : John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9780470711385.ch3.

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Kundu, Tanay, Leisan Gilmanova, Wai Fen Yong et Stefan Kaskel. « Metal-Organic Frameworks for Environmental Applications ». Dans Porous Materials, 1–39. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65991-2_1.

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Vishnoi, Pratap, et Ramaswamy Murugavel. « Metal Silicate and Phosphate Nanomaterials ». Dans Molecular Materials, 153–88. Boca Raton, FL : CRC Press, [2017] : CRC Press, 2017. http://dx.doi.org/10.1201/9781315118697-7.

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Pan, Jian, Jie Mo Tian, Li Min Dong, Chen Wang et Qing Feng Zan. « Self-Setting Biphase Porous Calcium Phosphate Cement ». Dans Key Engineering Materials, 1615–17. Stafa : Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.1615.

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Doménech-Carbó, Antonio. « Electrochemistry of Metal-Organic Frameworks ». Dans Electrochemistry of Porous Materials, 101–12. 2e éd. Names : Domeénech-Carboó, Antonio, author. Title : Electrochemistry of porous materials / Antonio Domeénech Carboó. Description : Second edition. | Boca Raton : CRC Press, 2021. : CRC Press, 2021. http://dx.doi.org/10.1201/9780429351624-6.

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Baur, Hartmut, Klaus Lempenauer, Martin Hartweg, Günter Stephani, Olaf Andersen et Osmin Delverdier. « Porous Metal Fiber Components - POMFICO ». Dans Materials for Transportation Technology, 95–102. Weinheim, FRG : Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527606025.ch17.

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Feng, Bo, Jie Weng, Yu Liang, Shu Xin Qu, Jin Wang et Xiong Lu. « Fabrication of Porous Titania and Porous Calcium Phosphate Coatings on Titanium Surface ». Dans Key Engineering Materials, 529–32. Stafa : Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-422-7.529.

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Tas, A. Cuneyt. « Biomimetic Calcium Phosphate Synthesis by using Calcium Metal ». Dans Advances in Bioceramics and Porous Ceramics VI, 93–106. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118807811.ch8.

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Actes de conférences sur le sujet "Metal Phosphate Porous Materials"

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Gotman, I., S. K. Swain, A. Sharipova et E. Y. Gutmanas. « Bioresorbable Ca-phosphate-polymer/metal and Fe-Ag nanocomposites for macro-porous scaffolds with tunable degradation and drug release ». Dans ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2016 : Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016. Author(s), 2016. http://dx.doi.org/10.1063/1.4966355.

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Rabadjieva, D., S. Tepavitcharova, R. Gergulova, K. Sezanova, R. Ilieva, M. Gabrashanska et M. Alexandrov. « Calcium phosphate porous composites and ceramics prospective as bone implants ». Dans 3RD INTERNATIONAL ADVANCES IN APPLIED PHYSICS AND MATERIALS SCIENCE CONGRESS. AIP, 2013. http://dx.doi.org/10.1063/1.4849317.

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WEN, F. S., X. ZHAO, C. Y. XI et J. S. CHEN. « HYDROTHERMAL SYNTHESIS AND PHOTOLUMINESCENCE OF METAL PHOSPHATE-BASED MATERIALS ». Dans Proceedings of the Seventh International Symposium on Hydrothermal Reactions. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812705228_0007.

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Mabrook, M. F. « Electrical characteristics of metal contacts on porous silicon ». Dans IEE Colloquium on Materials for Displays. IEE, 1995. http://dx.doi.org/10.1049/ic:19950981.

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Nazarenko, N. N., et A. G. Knyazeva. « Effective diffusion coefficient of biological liquids in porous calcium phosphate coatings ». Dans ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2016 : Proceedings of the International Conference on Advanced Materials with Hierarchical Structure for New Technologies and Reliable Structures 2016. Author(s), 2016. http://dx.doi.org/10.1063/1.4966455.

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Yao, Lin, Gui-Lin Yu, Su Cheng, Shu-Cheng Mu et Nan Li. « Study on Preparation of Porous Beta-tricalcium Phosphate Scaffold by In-situ Decomposition Method ». Dans The 2nd Annual International Workshop on Materials Science and Engineering (IWMSE 2016). WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813226517_0154.

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Zhang, Hang, Chongxiong Duan, Feier Li et Hongxia Xi. « Rapid room-temperature synthesis of hierarchical porous metal organic frameworks ». Dans MATERIALS SCIENCE, ENERGY TECHNOLOGY AND POWER ENGINEERING II (MEP2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5041118.

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Nabil, Marwa, et Hussien A. Motaweh. « Porous silicon powder as an adsorbent of heavy metal (nickel) ». Dans 2018 6TH INTERNATIONAL CONFERENCE ON NANO AND MATERIALS SCIENCE : ICNMS 2018. Author(s), 2018. http://dx.doi.org/10.1063/1.5034324.

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Oabi, O., A. Maaroufi, B. Lucas, S. Degot et A. El Amrani. « Composites of zinc phosphate glass/metal : New materials for thermoelectricity and solar cell devices ». Dans 2014 International Renewable and Sustainable Energy Conference (IRSEC). IEEE, 2014. http://dx.doi.org/10.1109/irsec.2014.7059838.

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Asano, S., T. Makuta et G. Murasawa. « Fabrication of grape-like structures with micro capsule covering metal powder, and application to novel porous metal ». Dans SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, sous la direction de Nakhiah C. Goulbourne et Zoubeida Ounaies. SPIE, 2012. http://dx.doi.org/10.1117/12.915131.

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Rapports d'organisations sur le sujet "Metal Phosphate Porous Materials"

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Kanan, Sofian M. Synthesis of Metal Nanoclusters Doped in Porous Materials as Photocatalysts. Fort Belvoir, VA : Defense Technical Information Center, avril 2008. http://dx.doi.org/10.21236/ada503178.

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Castafieda, P. P. Metal-Matrix Composites and Porous Materials : Constitute Models, Microstructure Evolution and Applications. Fort Belvoir, VA : Defense Technical Information Center, février 2000. http://dx.doi.org/10.21236/ada376316.

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