Structure And Thermal Properties Of Millimeter-Scale Alumina Aerogel Beads Formed By A Modified Ball Dropping Method

Abstract

We report the formation of millimeter-sized alumina aerogel beads with a modified ball dropping method, in which alumina alcogel beads are formed by extruding an alumina sol containing a small amount of polyvinyl alcohol (PVA) through nozzles into ammonia water, followed by supercritical drying. The resultant millimeter-sized alumina aerogel beads with the diameter ranging between 1-4 mm have an average pore size of 12-14 nm and specific surface area of 500-600 m2 g−1. They transform from γ-AlO2H phase to γ-Al2O3 phase at 400 °C, which remains stable even when the temperature reaches 1200 °C.

Publication Date

1-1-2017

Publication Title

RSC Advances

Volume

7

Issue

3

Number of Pages

1540-1545

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1039/c6ra26601k

Socpus ID

85009281044 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85009281044

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