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Size‐ and Shape‐Controlled Synthesis of Hexagonal Bipyramidal Crystals and Hollow Self‐Assembled Al‐MOF Spheres
Author(s) -
Sarawade Pradip,
Tan Hua,
Anjum Dalaver,
Cha Dongkyu,
Polshettiwar Vivek
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201300836
Subject(s) - nucleation , dispersity , hexagonal crystal system , materials science , spheres , chemical physics , chemical engineering , nanotechnology , metal organic framework , adsorption , self assembly , hysteresis , bipyramid , aluminium , crystallography , chemistry , crystal structure , polymer chemistry , composite material , organic chemistry , condensed matter physics , physics , astronomy , engineering
We report an efficient protocol for the synthesis of monodisperse crystals of an aluminum (Al)‐based metal organic framework (MOF) while obtaining excellent control over the size and shape solely by tuning of the reaction parameters without the use of a template or structure‐directing agent. The size of the hexagonal crystals of the Al‐MOF can be selectively varied from 100 nm to 2000 nm by simply changing the reaction time and temperature via its nucleation‐growth mechanism. We also report a self‐assembly phenomenon, observed for the first time in case of Al‐MOF, whereby hollow spheres of Al‐MOF were formed by the spontaneous organization of triangular sheet building blocks. These MOFs showed broad hysteresis loops during the CO 2 capture, indicating that the adsorbed CO 2 is not immediately desorbed upon decreasing the external pressure and is instead confined within the framework, which allows for the capture and subsequent selective trapping of CO 2 from gaseous mixtures.