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Your search keyword '"Liu, Jingjing"' showing total 29 results
Start Over Author "Liu, Jingjing" Search Limiters Full Text Journal ceramics international
29 results on '"Liu, Jingjing"'

15. Highly porous and mechanically robust Al2O3-based foams with self-wrinkled and rough aperture surfaces via binary colloidal self-assembly of nanoparticle/gelation network.

Author

Liu, Jingjing, Yang, Jinlong, Zhang, Jiyuan, Chen, Haiyang, and Kang, Shaojun

Subjects
*NANOPARTICLES, *POROUS materials, *FOAM, *ROUGH surfaces, *GELATION, *WRINKLE patterns, *SILICA nanoparticles
Abstract

Porous materials with wrinkled surfaces could have broad applications in catalysis and adsorption. However, designing cellular ceramics with similar structures is challenging. Herein, we demonstrated the binary colloidal self-assembly of γ-Al 2 O 3 nanoparticle/silica gelation network for constructing such materials. The competitive effect between volume shrinkage and surface bend during water evaporation of silica gel contributed to wrinkled aperture surface. During calcination, silica nanoparticles were highly active to react with alumina to form mullite nanocrystals, bringing about high compressive strength at low relative densities. After calcining at 1350 °C, resultant products with hierarchical structure exhibited an outstanding compressive strength of 4.2 MPa, a relatively high surface area of 7.23 m2/g at a porosity level of 83.3%. The current strategy provides a feasible and affordable approach for producing high performance ceramic foams towards practical application fields in catalysis and adsorption. [ABSTRACT FROM AUTHOR]

Published
2023
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22. Effects of pore structure on thermal conductivity and strength of alumina porous ceramics using carbon black as pore-forming agent

Author

Shujing Li, Yawei Li, Shaobai Sang, Liu Jingjing, and Yuanbing Li

Subjects
010302 applied physics, Pore size, Work (thermodynamics), Materials science, Process Chemistry and Technology, 02 engineering and technology, Carbon black, 021001 nanoscience & nanotechnology, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Porous ceramics, Thermal conductivity, Flexural strength, 0103 physical sciences, Materials Chemistry, Ceramics and Composites, Composite material, 0210 nano-technology, Porosity, Theory of relations
Abstract

In the present work, carbon black (CB) works as a pore-forming agent in the preparation of alumina porous ceramics. The pore structures (i.e. mean pore size, pore size distribution and various pores size proportions) were characterized by means of Micro-image Analysis and Process System (MIAPS) software and mercury intrusion porosimetry. Then their correlation and thermal conductivity as well as strength were determined using grey relation theory. The results showed that the porosity and mean pore size increased against the amount of CB, whereas the thermal conductivity, cold crushing strength and cold modulus of rupture reduced. The 14 μm pores had the opposite effects.

Published
2016

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