title: Manipulation of Amorphous-to-Crystalline Transformation: Towards the Construction of Covalent Organic Framework Hybrid Microspheres with NIR Photothermal Conversion Ability.
abstract: An approach to transforming amorphous organic networks into crystalline covalent organic frameworks (COFs) with retention of the colloidal nanosize and uniform morphology is presented. Specifically, Fe3O4nanoclusters are encapsulated by a disordering polyimine network via the Schiff-base reaction. The formed imine bonds could be reconstructed under thermodynamic control to reform the polyimine networks into imine-linked COFs in situ. Such a core-shell microsphere exhibits the uniform size and spherical shape, controllable COF shell thickness, accessible surface modification, and improved solution dispersibility as well as maintenance of high surface area, periodic micropores, and superior magnetic responsiveness. Additionally, the photothermal conversion effect is demonstrated for the first time on the nanoCOF layers upon exposure to near infrared light, providing convincing evidence for potential use in phototherapy.
authors.affiliation: State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science and Lab of Advanced Materials, Fudan University, 220 Handan Road, Shanghai, 200433, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Tan
authors.affiliation: National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency, Pathumthani, 12120, Thailand.
authors.forename: Supawadee
authors.initials: S
authors.lastname: Namuangruk
authors.affiliation: State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science and Lab of Advanced Materials, Fudan University, 220 Handan Road, Shanghai, 200433, China.
authors.forename: Weifu
authors.initials: W
authors.lastname: Kong
authors.affiliation: Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand.
authors.forename: Nawee
authors.initials: N
authors.lastname: Kungwan
authors.affiliation: State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science and Lab of Advanced Materials, Fudan University, 220 Handan Road, Shanghai, 200433, China. guojia@fudan.edu.cn.
authors.forename: Jia
authors.initials: J
authors.lastname: Guo
authors.affiliation: State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science and Lab of Advanced Materials, Fudan University, 220 Handan Road, Shanghai, 200433, China.
authors.forename: Changchun
authors.initials: C
authors.lastname: Wang
keywords: composite microspheres; covalent organic frameworks; imines; nanoclusters; photothermal conversion