Journal
SMALL
Volume 12, Issue 13, Pages 1797-1805Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201503547
Keywords
hierarchical materials; multi-templating; Pickering emulsions; porous structures; silica capsules
Categories
Funding
- National Basic Research Program [2015CB931801]
- National Natural Science Foundation of China [51473093, 21374062]
- EU COST actions [MP1305, MP1106]
- EU [FP7-REGPOT-2011-1]
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Hierarchical porous structures are ubiquitous in biological organisms and inorganic systems. Although such structures have been replicated, designed, and fabricated, they are often inferior to naturally occurring analogues. Apart from the complexity and multiple functionalities developed by the biological systems, the controllable and scalable production of hierarchically porous structures and building blocks remains a technological challenge. Herein, a facile and scalable approach is developed to fabricate hierarchical hollow spheres with integrated micro-, meso-, and macropores ranging from 1 nm to 100 m (spanning five orders of magnitude). (Macro)molecules, micro-rods (which play a key role for the creation of robust capsules), and emulsion droplets have been successfully employed as multiple length scale templates, allowing the creation of hierarchical porous macrospheres. Thanks to their specific mechanical strength, these hierarchical porous spheres could be incorporated and assembled as higher level building blocks in various novel materials.
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