Abstract:This review presents various TEM techniques including electron diffraction, high-resolution TEM and scanning TEM imaging, and electron tomography and their applications for structure characterization of zeolite materials.
“…The Zn is adsorbed in the interior surface region of the carbon sphere. This result was similar to that of 40 , 41 . Figure 8 ( a ) TEM image of carbon sphere before loading Zn.…”
The laboratory research was attempted to find nano zinc fertilizer utilizing the carbon sphere as a substrate. Typically the encapsulation techniques are followed in the drug delivery system, the limited work was done in nano-based zinc micronutrient for slow release of nutrients to crop. The use efficiency of zinc micronutrients in the soil is only less than 6 percentage. In universal, the deficiency of zinc micronutrients causes malnutrition problems in human beings, especially in children. After considering this problem we planned to prepare zinc nano fertilizer by using the carbon sphere for need-based slow release and increase the use efficiency of zinc micronutrient in soil. In this study we synthesis the carbon sphere nanoparticle after the formation of carbon sphere the zinc sulphate was loaded and characterized by utilizing Scanning Electron Microscopy, Surface Area and Porosity, X-ray diffraction analysis, Fourier Transform Infrared Spectroscopy, Transmission Electron Microscopy. The research result shows that the nano carbon sphere was excellently loaded with zinc sulphate to the tune of 8 percentage and it was confirmed by Energy dispersive X-beam spectroscopy. The zinc loaded carbon sphere release nutrient for a prolonged period of up to 600 h in the case of conventional zinc sulphate zinc release halted after 216 h in percolation reactor studies. The zinc nano fertilizer is recommended in agriculture to increase zinc use efficiency, crop yield without any environmental risk.
“…The Zn is adsorbed in the interior surface region of the carbon sphere. This result was similar to that of 40 , 41 . Figure 8 ( a ) TEM image of carbon sphere before loading Zn.…”
The laboratory research was attempted to find nano zinc fertilizer utilizing the carbon sphere as a substrate. Typically the encapsulation techniques are followed in the drug delivery system, the limited work was done in nano-based zinc micronutrient for slow release of nutrients to crop. The use efficiency of zinc micronutrients in the soil is only less than 6 percentage. In universal, the deficiency of zinc micronutrients causes malnutrition problems in human beings, especially in children. After considering this problem we planned to prepare zinc nano fertilizer by using the carbon sphere for need-based slow release and increase the use efficiency of zinc micronutrient in soil. In this study we synthesis the carbon sphere nanoparticle after the formation of carbon sphere the zinc sulphate was loaded and characterized by utilizing Scanning Electron Microscopy, Surface Area and Porosity, X-ray diffraction analysis, Fourier Transform Infrared Spectroscopy, Transmission Electron Microscopy. The research result shows that the nano carbon sphere was excellently loaded with zinc sulphate to the tune of 8 percentage and it was confirmed by Energy dispersive X-beam spectroscopy. The zinc loaded carbon sphere release nutrient for a prolonged period of up to 600 h in the case of conventional zinc sulphate zinc release halted after 216 h in percolation reactor studies. The zinc nano fertilizer is recommended in agriculture to increase zinc use efficiency, crop yield without any environmental risk.
“…As shown in Fig. 3, all the samples show typical hexagonal prismatic shape with similar crystallite size of 300~400 nm 28 . It should be noted that, according to these FESEM images, the morphology of the Ptzeolite materials is quite similar to each other, regardless of the chemical composition 29 .…”
Section: Field-emission Scanning Electron Microscopy (Fesem)mentioning
confidence: 73%
“…In fact, direct imaging of zeolite structures with atomic resolution, has been usually carried out in transmission mode (HRTEM), since phase contrast allows visualizing, with adequate signal/noise ratio, all the light elements (Si, Al and O) in the zeolite framework [26][27][28] . However, zeolites are usually quite sensitive to electron beam and the materials could be partially or completely damaged even after taking one TEM or HAADF-STEM image.…”
The encapsulation of subnanometric metal entities (isolated metal atoms and metal clusters with a few atoms) in porous materials such as zeolites can be an effective strategy for the stabilization of those metal species and therefore can be further used for a variety of catalytic reactions. However, due to the complexity of zeolite structures and their low stability under the electron beam, it is challenging to obtain atomic-level structural information of the subnanometric metal species encapsulated in zeolite crystallites. In this protocol, we would like to show the application of a scanning transmission electron microscopy (STEM) technique that records simultaneously the high-angle annular dark-field images (HAADF) and integrated differential phase contrast images (iDPC) for structural characterization of subnanometric Pt and Sn species within MFI zeolite. The approach relies on the use of a computational model to simulate results obtained under different conditions where the metals are present in different positions within the zeolite. This imaging technique allows to obtain simultaneously the spatial information of heavy elements (Pt and Sn in this work) and the zeolite framework structure, enabling us to directly determine the location of the subnanometric metal species. Moreover, we will also present the combination of other spectroscopy techniques as complimentary tools for the STEM-iDPC imaging technique in order to obtain global understanding and insights on the spatial distributions of subnanometric metal species in zeolite structure. These structural insights can provide guidelines for rational design of uniform metal-zeolite materials for catalytic applications.
“…In combination with imaging techniques, electron diffraction (ED) taken along well-dened zone axes had been applied for structure determination of nano-and submicron-sized crystals for more than 50 years. [14][15][16][17][18][19][20][21][22] However, collection and processing of such in-zone ED data for 3D structure determination is both demanding and time-consuming, requiring strong electron microscopy and crystallography expertise. More importantly, ED intensities suffer from dynamical effects generated by multiple scattering events of electrons in the crystal.…”
Section: Three-dimensional Electron Diffraction (3ded)mentioning
confidence: 99%
“…The readers are referred to recent review articles on HRTEM imaging of zeolites. 17,22 Compared to HRTEM imaging, 3DED is more feasible and less demanding in terms of both instrumentation and expertise. During the past decade, 3DED has played a dominating role in the discovery of novel zeolites and determination of their structures.…”
Section: Application Of 3ded To Zeolitesmentioning
Three-dimensional electron diffraction is a powerful tool for accurate structure determination of zeolite, MOF, and COF crystals that are too small for X-ray diffraction. By revealing the structural details, the properties of the materials can be understood, and new materials and applications can be designed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
