Du, Zijuan;
Qiao, Ang;
Zhou, Hemin;
Li, Zhencai;
Winters, Wessel MW;
Zhu, Jiexin;
He, Guanjie;
... Yue, Yuanzheng; + view all
(2023)
The glass transition in the high-density amorphous Zn/Co-ZIF-4.
Chemical Communications
10.1039/d3cc02492j.
(In press).
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Abstract
The high-density amorphous phases (HDAs) of bimetallic zeolitic imidazolate frameworks (Zn/Co-ZIF-4) were prepared. The temperature dependence of the isobaric heat capacity (Cp) of ZIF-4 HDAs was measured to determine the glass transition temperature (Tg) of HDAs. The Tg non-linearly decreases with the molar ratio R, where R is Co/(Co + Zn), indicating the presence of a mixed-metal node effect. This effect arises from the non-linear increase of the degree of configurational freedom in the HDA as R increases. The degree of configurational freedom is inversely correlated with the network connectivity, which is, in turn, affected by variations in the MN4 (M: Zn or Co; N: nitrogen) tetrahedral symmetry in the ZIF-4 HDA. Overall, this work offers valuable insights into the glass transition of metal-organic frameworks.
| Type: | Article |
|---|---|
| Title: | The glass transition in the high-density amorphous Zn/Co-ZIF-4 |
| Location: | England |
| DOI: | 10.1039/d3cc02492j |
| Publisher version: | https://doi.org/10.1039/d3cc02492j |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10177884 |
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