Details

Autor(en) / Beteiligte

• Allahyarli, Kamal
• Reithofer, Michael R.
• Cheng, Fei
• Young, Adam J.
• Kiss, Endre
• Tan, Tristan Tsai Yuan
• Prado-Roller, Alexander
• Chin, Jia Min

Titel

Metal-Organic Framework superstructures with long-ranged orientational order via E-field assisted liquid crystal assembly

Ist Teil von

• Journal of colloid and interface science, 2022-03, Vol.610, p.1027-1034

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A general method towards highly oriented MOF crystal superstructures with long-ranged directional order has been demonstrated using E-field assisted liquid crystalline assembly on various types of MOFs, namely MIL-53-NH2(Al), MIL-68(In) and NU-1000. This overcomes the long-standing challenge of oriented assembly of free-standing MOF crystals, previously limited to highly uniform particles, thereby broadening the possibilities for developing advanced MOF composites and devices. [Display omitted] Most MOFs are non-cubic, with functionality dependent upon crystallographic direction, and are largely prepared as microcrystalline powders. Therefore, general methods to orient and assemble free-standing MOF crystals are especially important and urgently needed. This is addressed here through the novel strategy of E-field assisted liquid crystal assembly, applied to MIL-53-NH2(Al), MIL-68(In) and NU-1000 MOF crystals, with aspect ratios ranging from 10 to 1.2, to form highly oriented MOF superstructures which were photopolymerized to fix their long-ranged order. This new strategy for controlling MOF orientation and packing side-steps the traditional requirements of particle monodispersity, shape homogeneity and high aspect ratios (>4.7) typical of colloidal and liquid crystal assembly, and is applicable even to polydispersed MOF crystals, thereby paving the way towards the development of highly oriented MOF composites with improved functionality.