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Structure and Connectivity in an Amorphous Silicon Oxycarbide Polymer-Derived Ceramic: Results from 2D ²⁹ Si NMR Spectroscopy

https://doi.org/10.1021/acs.jpcc.0c09860

Hung, Ivan ; Ionescu, Emanuel ; Sen, Jishnu ; Gan, Zhehong ; Sen, Sabyasachi ( March 2021 , The Journal of Physical Chemistry C)

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Observation of polymer-like flow mechanism in a short-chain phosphate glass-forming liquid

https://doi.org/10.1063/1.5141004

Xia, Yiqing ; Zhu, Weidi ; Sen, Jishnu ; Sen, Sabyasachi ( January 2020 , The Journal of Chemical Physics)

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Ultrahigh-field ⁶⁷ Zn NMR reveals short-range disorder in zeolitic imidazolate framework glasses

https://doi.org/10.1126/science.aaz0251

Madsen, Rasmus S. K. ; Qiao, Ang ; Sen, Jishnu ; Hung, Ivan ; Chen, Kuizhi ; Gan, Zhehong ; Sen, Sabyasachi ; Yue, Yuanzheng ( March 2020 , Science)

The structure of melt-quenched zeolitic imidazole framework (ZIF) glasses can provide insights into their glass-formation mechanism. We directly detected short-range disorder in ZIF glasses using ultrahigh-field zinc-67 solid-state nuclear magnetic resonance spectroscopy. Two distinct Zn sites characteristic of the parent crystals transformed upon melting into a single tetrahedral site with a broad distribution of structural parameters. Moreover, the ligand chemistry in ZIFs appeared to have no controlling effect on the short-range disorder, although the former affected their phase-transition behavior. These findings reveal structure-property relations and could help design metal-organic framework glasses.

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