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Emulsion‐Guided Controllable Construction of Anisotropic Particles: Droplet Size Determines Particle Structure
Author(s) -
Li Chen,
Peng Haijun,
Cai Jiandong,
Li Le,
Zhang Jian,
Mai Yiyong
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202102930
Subject(s) - materials science , emulsion , particle (ecology) , chemical engineering , nanotechnology , anisotropy , nanoparticle , particle size , fabrication , optics , oceanography , physics , engineering , geology , medicine , alternative medicine , pathology
Abstract Anisotropic particles have attracted significant attention due to their alluring features that distinguish them from isotropic particles. One of the most appealing strategies for the synthesis of anisotropic particles is the emulsion‐guided method. However, morphological control and the understanding of formation mechanisms have remained a major challenge. Based on a novel mechanism, here, a facile one‐pot emulsion‐templating method for the tunable construction of anisotropic polymeric particles (APPs) with different defined structures is reported. Three types of monocomponent APPs with new morphologies and sizes in the range of 240–650 nm, including Janus mushroom‐like mesoporous poly(m‐phenylenediamine) (PmPD) particles, wheel‐shaped particles, and acorn‐like PmPD particles, are obtained by controlling the average size of the oil droplets in the emulsion. Furthermore, the APPs demonstrate the ability for conversion to nitrogen‐doped anisotropic carbon particles (ACPs) by pyrolysis at 800 °C under a N 2 atmosphere, thereby inheriting their structures. These novel ACPs show appreciable potential as metal‐free electrocatalysts for use in oxygen reduction reactions. Compared to their isotropic counterpart, these ACPs exhibit remarkable advantages such as enhanced specific surface area and pore volume, reduced stacking density, and easy fabrication of continuous and uniform membrane electrodes.