Preparation and characterization of aerogels derived from Al(OH)3 and CrO3

Ayers, Michael; White, Ashley A.; Song, Xian; Hunt, Arlon J.

doi:10.1016/j.jnoncrysol.2003.09.029

Cited by 2 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Drying of the wet gels, to produce the corresponding aerogels, followed standard CO 2 substitution and drying procedures [16,17]. The total process time was 18 h, and the process conditions were maintained at 5°C and 55 bar during the substitution phase, and 45°C and 90 bar during the drying phase.…”

Section: Methodsmentioning

confidence: 99%

“…In this regard, it has long been know that incorporation of a small percentage of SiO 2 into alumina aerogels greatly reduced their loss of surface area upon thermal exposure [14 and 15]. Therefore, we have concentrated our studies on ternary oxides of the Al 2 O 3 /Cr 2 O 3 /SiO 2 system [16]. The physical properties of these materials after conversion to aerogels by supercritical drying, and after subsequent treatment at high temperatures will be discussed.…”

Section: Approachmentioning

confidence: 99%

See 1 more Smart Citation

New Advanced Nanoporous Materials for Industrial HeatingApplications

Hunt¹

2006

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

Section: Approachmentioning

confidence: 99%

New Advanced Nanoporous Materials for Industrial HeatingApplications

Hunt¹

2006

View full text Add to dashboard Cite

Characterisation of calcium aluminate cement hydration: comparison of low-field NMR and conventional methods

She

Zhao

et al. 2022

Advances in Cement Research

View full text Add to dashboard Cite

The early hydration process of calcium aluminate cement (CAC) was characterised by low-field nuclear magnetic resonance (LF-NMR), isothermal calorimetry (IC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was revealed that LF-NMR characterisation of the hydration process gives results very similar to those of IC; both show that the hydration reaction is faster in about 10–17 h. In addition, the hydration process of CAC could be quantitatively divided into four stages according to the second derivative of LF-NMR signal amplitude. LF-NMR is also used in the study of CAC microstructure. The results of the T2 distribution curve prove that there are mainly two kinds of pores of different sizes in the slurry, and they gradually become smaller, especially in more than 10 h. The weighted average T2 and specific surface area decreased and increased, respectively, due to the gradual densification of the slurry. Owing to the conversion of CAH10 and C2AH8 to C3AH6, the solid specific surface area decreased, resulting in the LF-NMR specific surface area curve slowing down or even decreasing in about 20–50 h of hydration. XRD and SEM results further validate the characterisation of hydrated CAC microstructure by LF-NMR.

show abstract

Preparation and characterization of aerogels derived from Al(OH)3 and CrO3

Cited by 2 publications

References 17 publications

New Advanced Nanoporous Materials for Industrial HeatingApplications

New Advanced Nanoporous Materials for Industrial HeatingApplications

Characterisation of calcium aluminate cement hydration: comparison of low-field NMR and conventional methods

Contact Info

Product

Resources

About