Metal-Organic Frameworks


10:09 AM

1 min read
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Researchers have carried out an in-depth analysis of the mechanisms underlying the flexibility of crystals of Metal-organic frameworks (MOFs) and introduced a novel quantitative measure of mechanical flexibility for crystals.

About Metal-Organic Frameworks (MOFs): 

  • MOFs are a class of porous, crystalline materials with a broad range of applications.
  • They are composed of metal ions or clusters, which act as the joints, bound by multidirectional organic ligands, which act as linkers in the network structure.
  • These crystalline materials possess the remarkable ability to absorb gases, such as carbon dioxide, and store them as well as act as filters for crude oil purification.
  • MOFs derive their ability from the presence of nanopores, enhancing their surface areas that, in turn, make them adept at absorbing and storing gases.
  • Flexibility in crystals has been assessed in terms of a parameter called elastic modulus, which is a measure of a material’s resistance to strain-induced deformation.
  • New quantitative measure of mechanical flexibility
    • New study proposes a unique theoretical measure based on the fractional release of elastic stress or strain energy through internal structural rearrangements under symmetry constraints.
    • This new metric can be readily calculated using standard techniques of simulation and can rate the flexibility of a crystal on a scale of zero to one, zero signifying the least flexibility while one indicates maximum flexibility. 
  • They have limited stability and mechanical weakness which has hindered their broader applications.

Q1: What is Porosity?

It is the property of an object that expresses the total volume of empty or pore space in the material. For rocks that contain hydrocarbon resources, porosity measures the percentage pore space occupied in a rock.

Source: Scientists propose a new measure of flexibility for crystals