Gotowe bibliografie tematyczne / Nanostructured sieve

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Gotowa bibliografia na temat „Nanostructured sieve”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Nanostructured sieve"

Saravaia, Hitesh, Hariom Gupta i Vaibhav Kulshrestha. "Single step synthesis of a magnesium doped lithium manganese oxide ion sieve nanomaterial and a SPES/ion sieve composite membrane for the separation of lithium". RSC Advances 6, nr 108 (2016): 106980–89. http://dx.doi.org/10.1039/c6ra14230c.

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Yuan, Zhong-Yong, Wuzong Zhou, Viorica Parvulescu i Bao-Lian Su. "Electron beam irradiation effect on nanostructured molecular sieve catalysts". Journal of Electron Spectroscopy and Related Phenomena 129, nr 2-3 (czerwiec 2003): 189–94. http://dx.doi.org/10.1016/s0368-2048(03)00068-9.

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Kinka, M., J. Banys, J. Macutkevic i A. Meskauskas. "Conductivity of nanostructured mesoporous MCM-41 molecular sieve materials". Electrochimica Acta 51, nr 27 (sierpień 2006): 6203–6. http://dx.doi.org/10.1016/j.electacta.2006.01.069.

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Mansurov, Z. A., A. R. Kerimkulova, S. A. Ibragimova i E. Y. Gukenheimer. "Carbon Nanosorbent for Purification Different Biomolecules". Eurasian Chemico-Technological Journal 14, nr 1 (15.12.2011): 41. http://dx.doi.org/10.18321/ectj98.

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The article presents the results of physico-chemical studies on the development of nanostructured carbon materials from domestic raw materials. Were obtained and tested micro-mesoporous carbon sorbents for molecular-sieve chromatography of markers and investigated the applicability of carbon sorbents for the separation of protein-lipid complex, and plant bio-stimulator. Carbon sorbents have well-developed porous structure but their disadvantage is the weak mechanical<br />strength. Recently it was shown that some carbon nanostructures have enormous strength. Thus arose the need to give the nano structured elements to carbon sorbent. Creating carbon sorbents containing nanocarbon structure was the aim of our study, as these by sorbents will be very useful for large-scale purification of biomolecules.

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Kerimkulova, Almagul R., Seitkhan Azat, Zulkhair A. Mansurov, Murat K. Gilmanov, S. A. Ibragimova, Sergazy M. Аdekenov i Bibigul B. Rachimova. "Mesoporous Nano Carbon Sorbents for Separating Different Biomolecules". Advanced Materials Research 535-537 (czerwiec 2012): 284–88. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.284.

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Kannan, Ramanujam, Kulandaivelu Karunakaran i Samuel Vasanthkumar. "Nanostructured OMO type Manganese Oxide – as Novel Support for Palladium towards Electrooxidation of Methanol and Ethylene Glycol". Journal of New Materials for Electrochemical Systems 15, nr 4 (19.07.2012): 249–54. http://dx.doi.org/10.14447/jnmes.v15i4.39.

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Octahedral molecular sieve type manganese oxide (OMO) was synthesized by the ultra sonic assisted hydrothermal method, and was subsequently used as supportive material for palladium (Pd) metal towards the electrooxidation of methanol and ethylene glycol. The Pd nanoparticles were coated on the OMO by insitu reduction method. Low quantity of 5% Pd metal was used and the electrocatalytic activity was studied. The prepared OMO and the OMO/Pd nanocomposite were characterized by powder X–ray diffractogram (XRD), Scanning Electron Microscopy (SEM), Energy dispersive X–ray spectroscopy (EDS) and electrochemical methods. These studies demonstrated that the OMO can act as a good catalyst supporting material. The OMO helps to enhance the catalytic activity of Pd metal by supplying the active oxygen, which is extracted from the electrolytic solution. The electrooxidation of EG shows improved catalytic activity.

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Zhai, Qing-Zhou. "Removal of Pb (II) from Aqueous Medium by Nanostructured Mesoporous Material MCM-48: Studies on Equilibrium, Isotherm, Kinetics and Thermodynamics". Micro and Nanosystems 11, nr 2 (20.08.2019): 123–32. http://dx.doi.org/10.2174/1876402911666190422143914.

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Background: In recent years, with the progress of human civilization, environmental pollution is aggravating. Among them, heavy metal pollution is one of the greatest harmful water pollution problems. As a global pollution problem, heavy metal pollution, such as lead, has been given more attention by scientists. How to solve this problem, is an interesting issue. Objective: The aims of the current study are to develop the optimized adsorption conditions of Pb2+ by an MCM (Mobil Composition of Matter)-48 mesoporous molecular sieve material and study the properties of this adsorption. Method: First, an MCM-48 mesoporous molecular sieve was prepared by the hydrothermal method by using cetyltrimethylammonium as the template and tetraethyl orthosilicate as the silica source. The prepared sample was characterized by powder X-ray diffraction and scanning electron microscopy. Then, a harmful heavy metal Pb2+ was adsorbed by MCM-48. Effects of acidity, contact time, temperature, the initial concentration of lead(II) and the dosage of adsorbent on the rates of adsorption were studied, and the optimum adsorptive conditions were obtained. Results: The results show that when pH value was 4.5, the temperature was 18 ± 1°C, contact time was 40 min and m(MCM-48): m(Pb2+) = 2.5 (mass ratio), the adsorptive effect was the best, the adsorption rate was 96.71% and the adsorptive capacity was 386.84 mg/g. After the kinetic calculation, it was known that the process of the adsorption of Pb2+ by MCM-48 conforms to the pseudo-secondorder kinetic equation. Thermodynamic calculation shows that the adsorption is an exothermic process. The adsorption obeys the Freundlich adsorption isotherm equation. Nitric acid, hydrochloric acid and acetic acid were used to study the effects of desorption, indicating that the desorptive effect was the best using 0.1 mol/L of nitric acid as a desorptive agent. At the time of desorption 6 h, its desorptive ratio was the highest and reached 71.11%. Conclusion: This method is an alternative for removing harmful substances containing lead, which has a potential for application in processing lead-polluted waters.

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Goyal, Nitin, Peng Gao, Zhe Wang, Shuwen Cheng, Yong Sik Ok, Gang Li i Liying Liu. "Nanostructured chitosan/molecular sieve-4A an emergent material for the synergistic adsorption of radioactive major pollutants cesium and strontium". Journal of Hazardous Materials 392 (czerwiec 2020): 122494. http://dx.doi.org/10.1016/j.jhazmat.2020.122494.

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Mendoza-Nieto, J. A., K. D. Tejeda-Espinosa, I. Puente-Lee, C. Salcedo-Luna i T. Klimova. "Nanostructured SBA-15 Materials as Appropriate Supports for Active Hydrodesulfurization Catalysts Prepared from HSiW Heteropolyacid". MRS Proceedings 1479 (2012): 77–82. http://dx.doi.org/10.1557/opl.2012.1601.

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ABSTRACTA series of NiW catalysts supported on SBA-15-type materials modified with Al, Ti or Zr were prepared and tested in simultaneous hydrodesulfurization (HDS) of two model compounds: dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). Catalysts were prepared by incipient wetness impregnation of SBA-type materials (pure silica SBA-15, Al-SBA-15, Ti-SBA-15 or Zr-SBA-15) using Keggin-type heteropolyacid H4SiW12O40 as active phase precursor and nickel nitrate. Nominal composition of the catalysts was 19 wt.% of WO3 and 3 wt.% of NiO. The supports and catalysts were characterized by SEM-EDX, N2physisorption, small-angle and powder XRD, UV-Vis DRS, TPR and HRTEM. It was shown that a good dispersion of Al, Ti and Zr species on the SBA-15 surface was reached. The characteristic structure of the SBA-15 support was preserved in all supports and NiW catalysts. Addition of metal atoms (Al, Ti, Zr) on the SBA-15 surface prior to catalysts’ preparation improved dispersion of Ni and W oxide species in calcined catalysts. HRTEM characterization of sulfided catalysts showed that the dispersion of NiW active phase was also better on metal-containing SBA-15 supports than on the pure silica one. All NiW catalysts supported on metal-containing SBA-15 materials showed an outstanding catalytic performance in HDS of both model compounds used (DBT and 4,6-DMDBT). A good correlation was found between the dispersion of sulfided NiW active phase and catalytic activity results. The highest HDS activity was obtained with the NiW catalyst supported on Zr-containing SBA-15 molecular sieve, which makes it a promising catalytic system for ultra-deep hydrodesulfurization of diesel fuel.

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Aleksic, Obrad, i Pantelija Nikolic. "Recent advances in NTC thick film thermistor properties and applications". Facta universitatis - series: Electronics and Energetics 30, nr 3 (2017): 267–84. http://dx.doi.org/10.2298/fuee1703267a.

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An introduction to thermal sensors and thermistor materials is given in brief. After that novel electrical components such as thick film thermistors and thermal sensors based on them are described: Custom designed NTC thermistor pastes based on nickel manganite NiM2O4 micro/nanostructured powder were composed and new planar cell-based (segmented) constructions were printed on alumina. The thick film segmented thermistors were used in novel thermal sensors such as anemometers, water flow meters, gradient temperature sensor of the ground, and other applications. The advances achieved are the consequence of previous improvements of thermistor material based on nickel manganite and modified nickel manganite such as Cu0.2Ni0.5Zn1.0Mn1.3O4 and optimization of thick film thermistor geometries for sensor applications. The thermistor powders where produced by a solid state reaction of MnCO3, NiO, CuO, ZnO powders mixed in proper weight ratio. After calcination the obtained thermistor materials were milled in planetary ball mils, agate mills and finally sieved by 400 mesh sieve. The powders were characterized by XRD and SEM. The new thick film pastes where composed of the powders achieved, an organic vehicle and glass frit. The pastes were printed on alumina, dried and sintered and characterized again by XRD, SEM and electrical measurements. Different thick film thermistor constructions such as rectangular, sandwich, interdigitated and segmented were printed of new thermistor pastes. Their properties such as electrical resistance of the thermistor samples where mutually compared. The electrode effect was measured for all mentioned constructions and surface resistance was determined. It was used for modeling and realizations of high, medium and low ohmic thermistors with different power dissipation and heat loss. Finally all the results obtained lead to thermal sensors based on heat loss for measuring the air flow, water flow, temperature gradient and heat transfer from the air to the ground.

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Rozprawy doktorskie na temat "Nanostructured sieve"

Thompson, Joshua A. "Evaluation and application of new nanoporous materials for acid gas separations". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/48983.

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Distillation and absorption columns offer significant energy demands for future development in the petrochemical and fine chemical industries. Membranes and adsorbents are attractive alternatives to these classical separation units due to lower operating cost and easy device fabrication; however, membranes possess an upper limit in separation performance that results in a trade-off between selectivity (purity) and permeability (productivity) for the target gas product, and adsorbents require the need to be water-resistant to natural gas streams in order to withstand typical gas compositions. Composite membranes, or mixed-matrix membranes, are an appealing alternative to pure polymeric membrane materials by use of a molecular sieve “filler” phase which has higher separation performance than the pure polymer. In this thesis, the structure-property-processing relationships for a new class of molecular sieves known as zeolitic imidazolate frameworks (ZIFs) are investigated for their use as the filler phase in composite membranes or as adsorbents. These materials show robust chemical and thermal stability and are a promising class of molecular sieves for acid gas (CO₂/CH₄) separations. The synthesis of mixed-linker ZIFs is first investigated. It is shown that the organic linker composition in these materials is controllable without changing the crystal structure or significantly altering the thermal decomposition properties. There are observable changes in the adsorption properties, determined by nitrogen physisorption, that depend on the overall linker composition. The results suggest the proposed synthesis route facilitates a tunable process to control either the adsorption or diffusion properties depending on the linker composition. The structure-property-processing relationship for a specific ZIF, ZIF-8, is then investigated to determine the proper processing conditions necessary for fabricating defect-free composite membranes. The effect of ultrasonication shows an unexpected coarsening of ZIF-8 nanoparticles that grow with increased sonication time, but the structural integrity is shown to be maintained after sonication by using X-ray diffraction, Pair Distribution Function analysis, and nitrogen physisorption. The permeation properties of composite membranes revealed that intense ultrasonication is necessary to fabricate defect-free membranes for CO₂/CH₄ gas separations. Finally, the separation properties of mixed-linker ZIFs is investigated by using adsorption studies of CO₂ and CH₄ and using composite membranes with differing linker compositions. Adsorption properties of mixed-linker ZIFs reveal that these materials possess tunable surface properties, and a selectivity enhancement of six fold over ZIF-8 is observed with mixed-linker ZIFs without changing the crystal structure. Gas permeation studies of composite membranes reveal that the separation properties of mixed-linker ZIFs are different from their parent frameworks. By proper selection of mixed-linker ZIFs, there is an overall improvement of separation properties in the composite membranes when compared to ZIF-8.

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Modak, Chandantaru Dey. "Droplet, Jets, and Leaky Surfaces". Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5853.

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Surface structuring on a micro-nano scale, combined with a low surface energy coating, leads to anti-wetting properties. Such surfaces also exhibit other properties such as self-cleaning, antifouling, bacteriostatic, drag reduction, and anti-icing. Hierarchical structures with dual-scale roughness provide the superhydrophobic surface with lower droplet adhesion and better protection against failure (i.e., Wenzel transition). This understanding has led to the study of nanostructured sieves, as the sieve wires (having diameters ranging from 10 to 100 microns) provide the higher-level roughness required in dual-scale surfaces. Thus, for sieves, a single nano-structuring step leads to dual-scale rough surfaces. Further, the pores in sieves provide an additional structural feature for enabling other applications such as oil-water separation. Hence, nanostructured sieves are being investigated today for novel applications. Studying the impact of droplets on sieves with different wettability is fascinating as their porosity leads to several exciting scenarios that can be explored for potential use. This thesis investigates the different outcomes of droplet impact on sieves and explores new possibilities. The first part of the study explores droplet impact at the low Weber number regime. The formation of different cavities and their collapse have been studied. The focusing of kinetic energy in the cavity collapse process and the associated singularity leads to the generation of a single droplet. This work reports a new kind of cavity formation phenomenon unique to sieve configurations. In contrast to cavities observed for droplet impact on solid surfaces, this cavity is formed during the droplet impact's recoil phase. Hence, it is called the recoil cavity. The cavity formation and collapse are explained using experimental results and theoretical modeling. The collapse of the recoil cavity leads to the generation of a satellite-free single droplet underneath the sieve. Essentially this phenomenon of ejecting a single drop opens up avenues for novel applications. This thesis explores the drop-on-demand technique for material jetting and printing. Interestingly, we found that using superhydrophobic sieves could eliminate a long-standing problem of clogging in printing. We explored the clogging issue in-depth and showed our technique's unique capability in printing high mass loading and large particle size. We report printing of ink with mass loading as high as 71% using our technique. Further, the use of this printing technique has been demonstrated for various applications. Electronic circuits and devices have been printed on flexible substrates. 3D printing has also been demonstrated using high mass loading ink. Printing of live cells and bacteria has also been achieved using this technique. This thesis explores droplet impact at a high Weber number regime in the second part. We developed double sieve-based air-transparent surfaces capable of repelling rain droplets impacting at terminal velocities. Such air-transparent surfaces will find use in roofs and windows of homes and public places. Current understanding would point towards the use of nanostructured superhydrophobic sieves. However, liquid leaks through such superhydrophobic sieves when the dynamic pressure of the impacting droplet is larger than the anti-penetration Laplace pressure. When the droplet penetrates through the sieve, it comes out in the form of jets. Due to Rayleigh-Plateau instability, the ejected jets break into smaller droplets. This jetting dictates the outcome of the impact. Contrary to the common understanding, we explain our experimental results, which show that the jet velocity can be larger than the impact velocity. This increase in velocity of the ejected droplet makes it difficult to stop the ejected jet using a second superhydrophobic sieve. We use a combination of superhydrophilic and superhydrophobic sieves to repel raindrops impacting at the terminal velocity. Overall, this thesis deals with the droplet interaction with sieves of different wettability. The present work evolves to innovate interesting applications and solve significant problems.

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Książki na temat "Nanostructured sieve"

1942-, Occelli Mario L., i Kessler Henri 1935-, red. Synthesis of porous materials: Zeolites, clays, and nanostructures. New York: Marcel Dekker, 1997.

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Franco, Laeri, red. Host-guest-systems based on nanoporous crystals. Weinheim: Wiley-VCH, 2003.

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Professor, Lu G. Q., i Zhao X. S, red. Nanoporous materials: Science and engineering. London: Imperial College Press, 2004.

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A, Sayari, i Jaroniec M, red. Nanoporous materials: Proceedings of the 5th international symposium, Vancouver, Canada, 25-28 May 2008. New Jersey: World Scientific, 2008.

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International Symposium on Nanoporous Materials (3rd 2002 Ottawa, Ont.). Nanoporous Materials III: Proceedings of the 3rd International Symposium on Nanoporous Materials, Ottawa, Ontario, Canada, June 12-15, 2002. Amsterdam: Elsevier, 2002.

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Conference, on Access in Nanoporous Materials (2nd 2000 Banff Alta ). Nanoporous materials II: Proceedings of the 2nd Conference on Access in Nanoporous Materials, Banff, Alberta, Canada, May 25-30, 2000. Amsterdam: Elsevier Science B.V., 2000.

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(Editor), G. Q. Lu, i X. S. Zhao (Editor), red. Nanoporous Materials: Science and Engineering (Series on Chemical Engineering). Imperial College Press, 2005.

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(Editor), G. Q. Lu, i X. S. Zhao (Editor), red. Nanoporous Materials: Science and Engineering (Series on Chemical Engineering). World Scientific Publishing Company, 2004.

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Sayari, A., i M. Jaroniec. Nanoporous Materials III (Studies in Surface Science and Catalysis). Elsevier Science, 2002.

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(Editor), A. Sayari, M. Jaroniec (Editor) i T. J. Pinnavaia (Editor), red. Nanoporous Materials II (Studies in Surface Science and Catalysis). Elsevier Science, 2000.

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Części książek na temat "Nanostructured sieve"

Wan, Albert, i Soofin Cheng. "Photodegradation of Pollutants in Water over TiO2 Supported on Molecular Sieves". W Nanostructured Photocatalysts, 259–80. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26079-2_15.

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Vartuli, J. C., C. T. Kresge, W. J. Roth, S. B. McCullen, J. S. Beck, K. D. Schmitt, M. E. Leonowicz, J. D. Lutner i E. W. Sheppard. "Designed Synthesis of Mesoporous Molecular Sieve Systems Using Surfactant-Directing Agents". W Advanced Catalysts and Nanostructured Materials, 1–19. Elsevier, 1996. http://dx.doi.org/10.1016/b978-012508460-4/50002-4.

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Yoo, Jin S., J. A. Donohue i C. Choi-Feng. "Preparation of Iron/Molybdenum/Molecular Sieves by Chemical Vapor Deposition". W Advanced Catalysts and Nanostructured Materials, 453–78. Elsevier, 1996. http://dx.doi.org/10.1016/b978-012508460-4/50019-x.

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Raporty organizacyjne na temat "Nanostructured sieve"

Kunhao Li, Michael Beaver. Advanced Nanostructured Molecular Sieves for Energy Efficient Industrial Separations. Office of Scientific and Technical Information (OSTI), styczeń 2012. http://dx.doi.org/10.2172/1033219.

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