Zeolite

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Zeolite
Zeolite, a crystalline microporous material, is structured as a TO4 tetrahedron (T=Si, Al, Ge, Ga, P, Be, Ga, B, etc.) composed of T-atom and O-atom, where cations are combined with O-atoms for balancing the anionic skeletal charge and the remaining pores are filled with H2O. Zeolites are widely used in industry as adsorbents, ion exchangers and catalysts.
Many zeolites are synthesized as polycrystalline powders and the crystal sizes are too small (<5 μm) to resolve the structures by single crystal X-ray diffraction, MicroED can collect single-crystal data from submicron-sized crystals using electron diffraction techniques.
Technical Features – MicroED
MicroED is a structure analysis technique which is developed based on cryo-transmission electron microscopy. The electron diffraction data is collected and analyzed by diffracting electrons from tiny crystals. Extremely small crystal sizes, like micro- and nano-sized crystals, can produce diffraction signals with sufficiently high signal-to-noise ratios. High resolution diffraction data can be provided quickly and efficiently, and it significantly reduces the requirements for sample shape, purity and size.

Publication Share
Peng Wu’s group at East China Normal University and Junliang Sun’s group at Peking University have discovered a new crystal ECNU-23 from the "pure" phase crystal ECNU-21 by 3D ED technology (equivalent to MicroED) and have resolved the structure of this crystal. This work is the first example of successful discovery and preparation of new structures of zeolite materials using 3D ED technology. It shows that the 3D ED technique has great advantages in detecting minor phases in mixtures and determining the structure of nanoscale single crystals.
沸石
Reference: 3D Electron Diffraction Unravels the New Zeolite ECNU-23 from the “Pure” Powder Sample of ECNU-21
Service Flow
流程图1
1.Requirement Confirmation 
Our technical support and commercial colleagues will keep a smooth communication with you throughout the process. After establishing contact with you, we will understand your sample information and requirements in detail, and provide you with the best customized solution.
2.Sample Evaluation 
You need to fill out the Sample Information Form and provide the information required by the technical team for evaluation. For example, providing powder diffraction data and SEM data, the technical team will then provide you with the sample evaluation results and preliminary feasibility program.
3. Sample Delivery 
You can choose the appropriate shipping method according to the characteristics of samples.
4.Data Collection and Processing 
We will prepare and process the samples according to the characteristics of the samples and the purpose of the experiment. The sample is placed under the electron microscope to find the appropriate sample particles, and series of clear and high quality electron diffraction point images will be collected.
5. Structure Analysis 
We will use different algorithms, such as Patterson method, direct method, charge flip method, maximum entropy method, genetic algorithm, simulated annealing method, etc., to resolve the distribution of atoms in the crystal and obtain the initial structure of the crystal. We will further refine the initial structure of the crystal to obtain a chemically reasonable and experimentally observed structure, and finally deliver the results.