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Meta‐separation: Improvement of Properties by Molecular Design of Metamaterials for Organophosphorous Flame Retardants
Author(s) -
Hwan Choi Kyoung,
So Jeong Kim M. E.,
Hack Suh Dong
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202101915
Subject(s) - metamaterial , materials science , thermal stability , pyrene , chemical engineering , hydrogen bond , phase (matter) , aqueous solution , molecule , chemical physics , organic chemistry , chemistry , optoelectronics , engineering
The separation of liquid mixture has been studied for a long time. Separation proceeds based on the difference in physical properties including pore size and electrostatic interaction. Therefore, there are many difficulties in separation of materials having similar size and/or polarities in physical properties. Recently, meta‐separation which is novel separation strategy employing a metamaterial was reported. It utilizes the structural properties of metamaterials rather than electrostatic characteristics to separate water‐organic mixtures. Although it proposes a new method for separation of aqueous liquid mixtures, it has a low phase transition temperature and melting point. A newly designed and synthesized 12,12′,12′′,12′′′‐(pyrene‐4,5,9,10‐tetrayltetrakis(oxy))tetrakis(dodecan‐1‐ol)(PTOH) can significantly increase the thermal stability by replacing the end of the building block with a hydroxyl group. This dramatically improves the stability of the metamaterial in the xy plane through hydrogen bonding interaction, thereby increasing the phase transition temperature by 23.49 °C. Furthermore, organophosphorous flame retardants (OPFRs), critical hazardous organic compounds, are entirely eliminated from the water mixture by molecular metamaterial with PTOH.