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Core-shell strain structure of zeolite microcrystals

Core-shell strain structure of zeolite microcrystals
Cha, Won SukJeong, Nak CheonSong, Sang HoonPark, Hyun JunThanh Pham, Tung Cao AoHarder, Ross J.Lim, Bo BaeXiong, GangAhn, Do CheonMcNulty, IanKim, Jung HoYoon, Kyung ByungRobinson, Ian KeithKim, Hyun Jung
DGIST Authors
Jeong, Nak Cheon
Issued Date
Article Type
Aluminosilicate MineralsCatalystsChemistryCoherent X-Ray Diffraction ImagingCore-Shell StructureCrystal StructureCrystallography, X-RayFluorescence MeasurementsMicrotechnologyMolecular SievesNegative Thermal ExpansionOrganic TemplatesStrainStrain StructureTemperatureThermal ExpansionTriangular DeformationX-Ray DiffractionX Ray CrystallographyX Ray DiffractionZeoliteZeolites
Zeolites are crystalline aluminosilicate minerals featuring a network of 0.3-1.5-nm-wide pores, used in industry as catalysts for hydrocarbon interconversion, ion exchangers, molecular sieves and adsorbents. For improved applications, it is highly useful to study the distribution of internal local strains because they sensitively affect the rates of adsorption and diffusion of guest molecules within zeolites. Here, we report the observation of an unusual triangular deformation field distribution in ZSM-5 zeolites by coherent X-ray diffraction imaging, showing the presence of a strain within the crystal arising from the heterogeneous core-shell structure, which is supported by finite element model calculation and confirmed by fluorescence measurement. The shell is composed of H-ZSM-5 with intrinsic negative thermal expansion whereas the core exhibits a different thermal expansion behaviour due to the presence of organic template residues, which usually remain when the starting materials are insufficiently calcined. Engineering such strain effects could have a major impact on the design of future catalysts. © 2013 Macmillan Publishers Limited. All rights reserved.
Nature Publishing Group
Related Researcher
  • 정낙천 Jeong, Nak Cheon 화학물리학과
  • Research Interests Inorganic Chemistry; Metal-Organic Framework; Nanoporous Materials; Electron Transport;Ion Transport
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Department of Physics and Chemistry Supramolecular Inorganic Chemistry Laboratory 1. Journal Articles


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