Preparation of three-dimensionally ordered macroporous perovskite materials

Abstract

In this paper, we use La 0.8 Sr 0.2 MnO 3 and La 0.7 Ca 0.2 Sr 0.1 MnO 3 as examples to demonstrate a preparation method for threedimensionally ordered macroporous (3DOM) perovskite thermochromic materials. Polystyrene spheres with an average diameter of 220 nm were self-assembled into a three-dimensionally ordered colloidal crystal template. A mixed metal nitrate solution prepared using La(NO 3 ) 3 ·6H 2 O, Ca(NO 3 ) 2 ·4H 2 O, Sr(NO 3 ) 2 , Mn(CH 3 COO) 2 ·4H 2 O and an ethanol precursor was used to fill the interstitial voids of the polystyrene colloidal crystal templates. 3DOM La 0.8 Sr 0.2 MnO 3 and La 0.7 Ca 0.2 Sr 0.1 MnO 3 materials were then obtained after the sphere templates were removed via drying and calcination. The results show that the framework of the 3DOM materials can have different thicknesses and pore shrinkage rates by varying the filling times. In addition, the Curie temperatures of the 3DOM and bulk La 0.8 Sr 0.2 MnO 3 materials can be varied by altering the preparation method. polystyrene spheres, colloidal crystal template, 3DOM, perovskite-type materials, thermochromic materials Citation:Fang J F, Xuan Y M, Li Q. Preparation of three-dimensionally ordered macroporous perovskite materials.

Temperature-Responsive Smart Nanocarriers for Delivery Of Therapeutic Agents: Applications and Recent Advances

“…137,138 Such materials have accessible macroporous networks, which can increase mass transport by reducing diffusion resistance. With this in mind, 3DOM materials are widely used as a drug/gene carrier in an efficient manner.…”

“…Through this process, 3DOM materials with a wide range of pore sizes, different components materials, and different properties can be prepared. 137,141,142 …”

Enhanced CO catalytic oxidation by Sr reconstruction on the surface of La x Sr 1− x CoO 3− δ

“…La x Sr 1Àx CoO 3Àd catalysts were synthesized by a sol-gel methods [29]. La(NO 3 ) 3 Á6H 2 O, Sr(NO 3 ) 2 and Co(NO 3 ) 2 Á6H 2 O (3 mmol) taken in a stoichiometric ratio were dissolved in 10 mL distilled water.…”

Three-dimensionally ordered macro–mesoporous CoMo bulk catalysts with superior performance in hydrodesulfurization of thiophene

“…controlled and tuned based on the well-ordered PMMA templates and other factors, such as the suitable precursor concentration, impregnation process, drying, and calcination conditions. 19,35 The macropore size of these CoMo bulk catalysts is around 150 nm, which is approximately equivalent to a 31% reduction compared to the initial microsphere particle size (220 nm) of PMMA due to the shrinkage of the template during the heat treatment procedure. 31,34 Besides, the introduction of a certain amount of PEG400 or F127 can benet the formation of the high-quality 3DOM structure, while F127 with the high content (molar ratio of PEG400/F127 ¼ 8.8) in the precursor can lead to the failure in the formation of 3DOM structure due to the high solution viscosity.…”