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Updated: Jun 6, 2026

Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
Published on: December 15, 2015
Gas-induced solid state transformation of an organic lattice: from nonporous to nanoporous
Jian Tian1, Praveen Thallapally, Jun Liu
1Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA.
Abstract:
A well-known organic host, tris-o-phenylenedioxycyclotriphosphazene, exists in two polymorphic guest-free forms: the thermodynamic nonporous high-density phase and the kinetic nanoporous low-density phase. Simple pressurization of the high density phase with CO(2) brings a solid-state transformation to the low density phase, resulting in significant expansion of the crystal volume by 23%.
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