Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anisotropic Elastic Properties of Flexible Metal-Organic Frameworks: How
  Soft are Soft Porous Crystals?   We performed ab initio calculations of the elastic constants of five flexible
metal-organic frameworks: MIL-53(Al), MIL-53(Ga), MIL-47 and the square and
lozenge structures of DMOF-1. Tensorial analysis of the elastic constants
reveal a highly anisotropic elastic behavior, some deformation directions
exhibiting very low Young's modulus and shear modulus. This anisotropy can
reach a 400:1 ratio between the most rigid and weakest directions, in stark
contrast with the case of non-flexible MOFs such as MOF-5 and ZIF-8. In
addition, we show that flexible MOFs can display extremely large negative
linear compressibility (NLC). These results uncover the microscopic roots of
stimuli-induced structural transitions in flexible MOFs, by linking the local
elastic behavior of the material and its multistability.

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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat