Poly(ethylenimine)-Functionalized Monolithic Alumina Honeycomb Adsorbents for CO2Capture from Air

ChemSusChem ◽  
2016 ◽  
Vol 9 (14) ◽  
pp. 1859-1868 ◽  
Author(s):  
Miles A. Sakwa-Novak ◽  
Chun-Jae Yoo ◽  
Shuai Tan ◽  
Fereshteh Rashidi ◽  
Christopher W. Jones
Keyword(s):  
Monolithic Alumina

A facile method to fabricate monolithic alumina–silica aerogels with high surface areas and good mechanical properties

2020 ◽  
Vol 40 (6) ◽  
pp. 2480-2488 ◽  
Author(s):  
Fei Peng ◽  
Yonggang Jiang ◽  
Junzong Feng ◽  
Liangjun Li ◽  
Huafei Cai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Surface ◽  
Silica Aerogels ◽  
Surface Areas ◽  
Monolithic Alumina

Effect of SiC Shape on The Crack-Healing Mechanism of Alumina/SiC Composite

2005 ◽  
Vol 888 ◽  
Author(s):  
Wataru Nakao ◽  
Toshio Osada ◽  
Kazuya Yamane ◽  
Masahiro Yokouchi ◽  
Koji Takahashi ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Crack Size ◽  
Surface Cracks ◽  
Crack Healing ◽  
Weak Point ◽  
Strength Recovery ◽  
Sic Particles ◽  
Sic Whiskers ◽  
Monolithic Alumina ◽  
Surface Length

ABSTRACTCrack-healing of structural ceramics is a most valuable technique to overcome their weak point such as surface cracks. Crack-healing ability appeared by admixing SiC to ceramics, because this function is to use the oxidation of SiC. Endowment of crack-healing ability as well as improvement in fracture toughness was expected to be achieved by compositing SiC whiskers. For this purpose, alumina / 30 vol% SiC whiskers and alumina/ 20vol% SiC whiskers/ 10 vol% SiC particles multi-composites were developed. Crack-healing ability and fracture toughness of these composites were investigated. Alumina/ 20 vol% SiC whiskers/ 10 vol% SiC particles multi-composite and alumina/ 30vol% SiC whiskers composite were found to have 1.43 times and 1.65 times higher fracture toughness than monolithic alumina, respectively. From the results of the strength recovery by crack-healing, alumina/ 20 vol% SiC whiskers/ 10 vol% SiC particles multi-composite and alumina / 30vol% SiC whiskers composite were found to be able to heal the pre-crack below 0.250 μm and 0.200 μm in surface length, respectively. In spite of the same SiC content, SiC particles and SiC whiskers multi-compositing enlarged the limit crack size to be able to crack-heal. On the other hand, increasing SiC whiskers content enhanced strength recovery of the specimen with the large crack above limit crack-size.

Investigation on the Reinforcement of Multi-Walled Carbon Nanotubes on Alumina Matrix

2006 ◽  
Vol 51 ◽  
pp. 64-67
Author(s):  
Jing Sun ◽  
Lian Gao
Keyword(s):  
Carbon Nanotubes ◽  
Bending Strength ◽  
Weight Percent ◽  
Processing Route ◽  
Matrix Composites ◽  
Alumina Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Alumina Composites ◽  
Walled Carbon Nanotubes ◽  
Monolithic Alumina

In this paper, a colloidal processing route was adopted to disperse multi-walled carbon nanotubes (MWNTs) into alumina powders homogenously. Alumina matrix composites containing 0.1 to 2 weight percent of MWNTs were successfully fabricated by pressureless sintering. Also, 1wt% MWNTs-alumina composites were prepared by hot pressing for comparison. It was found that when the sample was sintered at 1450oC, the addition of 1wt% carbon nanotubes led to 10% increase in bending strength compared with monolithic alumina. The reinforcement mechanism was discussed based on the microstructure investigation. The broken nanotubes and pullout of MWNTs at interfaces are efficient in transferring the load from the alumina matrix to the nanotubes, leading to the improvement of the mechanical properties.

Synthesis of high strength monolithic alumina aerogels at ambient pressure

RSC Advances ◽  
2015 ◽  
Vol 5 (23) ◽  
pp. 18025-18028 ◽  
Author(s):  
Fengchao Cao ◽  
Lili Ren ◽  
Xueai Li
Keyword(s):  
Ambient Pressure ◽  
High Strength ◽  
Ambient Pressure Drying ◽  
Alumina Aerogels ◽  
Alumina Sol ◽  
Monolithic Alumina

Mechanically strong monolithic alumina aerogels were obtained via ambient pressure drying by incorporating attapulgite (ATP) and alumina sol.

scholarly journals Synthesis of high porosity, monolithic alumina aerogels

2001 ◽  
Vol 285 (1-3) ◽  
pp. 57-63 ◽  
Author(s):  
J.F Poco ◽  
J.H Satcher ◽  
L.W Hrubesh
Keyword(s):  
High Porosity ◽  
Alumina Aerogels ◽  
Monolithic Alumina

Electronic transitions in α, θ and γ polymorphs of ultraporous monolithic alumina

2013 ◽  
Vol 7 (11) ◽  
pp. 1026-1029 ◽  
Author(s):  
L. Museur ◽  
M. Bouslama ◽  
M. Amamra ◽  
A. Kanaev
Keyword(s):  
Electronic Transitions ◽  
Monolithic Alumina
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