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131 results on '"Huo, Wenlong"'

38. A Novel Approach to Fabricate Foam Ceramics from Steel Slag.

Author

Zheng, Yu, Luo, Xudong, Yang, Jinlong, Huo, Wenlong, and Kang, Chi

Subjects
CERAMICS, INSULATING materials, FOAM, STEEL, RAW materials, THERMAL insulation, SLAG
Abstract

A novel approach is used for fabricating steel slag foam ceramics based on the particle-stabilized foaming method. In this work, steel slag was used as the raw material and propyl gallate (PG) was used as the surface modifier. For the first time, steel slag ceramic foams were successfully fabricated based on particle-stabilized foams. The results show that the stability of the ceramic foams was closely related to the pH value and PG concentration. The porosity and compressive strength could be controlled by changing the solid loading of steel slag and sintering temperature. The porosity of steel slag foam ceramics ranged from 85.6% to 62.53%, and the compressive strength was from 1.74 MPa to 10.42 MPa. The thermal conductivity of steel slag foam ceramics was only 0.067 W (m·K)−1, which shows that it could be used as a thermal insulation material. [ABSTRACT FROM AUTHOR]

Published
2020
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50. Aerogel‐like ceramic foams with super‐high porosity and nanoscale cell wall from sol nanoparticles stabilized foams.

Author

Huo, Wenlong, Zhang, Xiaoyan, Hou, Shiyu, Chen, Yugu, Wang, Yali, and Yang, Jinlong

Subjects
*FOAM, *SODIUM dodecyl sulfate, *CERAMIC materials, *POROUS materials, *COLLOIDS, *POROSITY
Abstract

Ultralight ceramic foam materials with high porosity play an important role in increasingly hi‐tech areas due to the combinative merit of ceramic material and highly porous structure. So far, it remains challenging to fabricate alumina ceramic foams with extremely high porosity and high specific surface area that are comparable to aerogel materials by employing a low cost, eco‐friendly and convenient approach. For the first time, we propose the preparation of aerogel‐like ceramic foams with nanoscale cell wall and unprecedentedly high porosity using boehmite sol as both ceramic source and bubble interface stabilizer, based on sol nanoparticles stabilized foams using sodium lauryl sulfate (SDS) as modifier. The obtained ultra‐stable sol foams allow for the achievement of bulk foams with ultrathin cell wall with thickness in the range of 30‐90 nm, super‐high porosity up to 99%, and large specific surface area of 280 m2/g, which is attributed to the well‐organized assembly of nanoparticles at the liquid/air interfaces. This novel foam material demonstrates excellent adsorption ability for polar volatile organic gases (VOCs) due to its extremely high porosity and large specific surface area. Ultralgiht cellular ceramic foams composed of uniformly assembled nanoparticles with nanoscale cell wall. [ABSTRACT FROM AUTHOR]

Published
2019
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