An unconventional route to fabricate highly pure α-Al₂O₃ nanocrystals with tunable surface chemistry based on a semi-aromatic polyamide with pyridine rings as a functional matrix

Abstract

Highly pure α-Al2O3 colloidal nanocrystals with tunable surface chemistry and dimensions were fabricated using semi-aromatic polyamide (PA6Py) with pyridine rings as a functional matrix.

Facile Fabrication of Size-Tunable Core/Shell Ferroelectric/Polymeric Nanoparticles with Tailorable Dielectric Properties via Organocatalyzed Atom Transfer Radical Polymerization Driven by Visible Light

“…Core/shell nanostructures consisting of an inorganic nanoparticle core and inorganic or organic shell have been broadly studied, not only as a strategy for improving the stability and changing the surface chemistry of inorganic core nanoparticles, but also as a method for obtaining unique chemical and physical properties, which is impossible from individual materials alone 1,2 . For example, when the surface of Au nanoparticles is coated by organic ligands comprising thiol groups as shell, unique optical properties can be generated 3,4 .…”

“…For example, the coating shell can be utilized to reduce undesirable interactions or enhance desired interactions 7 . Different from inorganic shell growing from the surface of nanoparticles, various different approaches have been utilized for the preparation of functional polymer shells, such as in situ polymerization from the functional surface of nanoparticles 8 , direct attaching functional polymer ligands onto surfaces of core nanoparticles 2,9 , layer-by-layer functional polymer deposition 10,11 , and in situ fabrication of inorganic nanoparticles using functional polymeric chains as ligands. However, in all of these strategies, it is challenging to control the growth of functional polymeric shell 12 .…”

Unconventional Strategy to Anatase TiO2 Nanocrystals with Tunable Surface Chemistry via Liquid Crystalline Polyamides as a Functional Matrix

“…Polyamides, especially thermotropic liquid crystalline polyamides (LCPAs) containing heterocyclic repeating units have received considerable attention due to their outstanding thermal stability, chemical resistance, and electrical and mechanical properties. , Furthermore, it is worth noting that the pyridine ring is typically a heterocyclic structure, one of the most stable architectures, and it is broadly used in the preparation of LCPA owing to its stiffness, asymmetric structure, and metal-ion-complexing abilities. , Owing to their unique chemical structure and preparation conditions, LCPAs containing pyridine units are an outstanding choice for use as a functional polymeric matrix for the fabrication of anatase TiO 2 nanocrystals.…”

“…33,34 Furthermore, it is worth noting that the pyridine ring is typically a heterocyclic structure, one of the most stable architectures, and it is broadly used in the preparation of LCPA owing to its stiffness, asymmetric structure, and metal-ion-complexing abilities. 35,36 Owing to their unique chemical structure and preparation conditions, LCPAs containing pyridine units are an outstanding choice for use as a functional polymeric matrix for the fabrication of anatase TiO 2 nanocrystals. Herein, we report an unconventional but robust route to fabricate anatase TiO 2 colloidal nanocrystals with tunable surface chemistry and dimensions via LCPAs with pyridine rings as a functional matrix.…”