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Title: Influence of Osmotic Drying with an Aqueous Poly(ethylene Glycol) Liquid Desiccant on Alumina Objects Gelcast with Gelatin

Gelcasting and liquid desiccant drying are novel forming and drying methods used to mitigate common issues associated with the fabrication of complex advanced ceramic objects. Here, the molecular weight and osmotic pressure of aqueous poly(ethylene glycol) (PEG) desiccant solutions were simultaneously varied to understand their influence on the net mass loss rates of gelcast alumina samples prepared using gelatin as a gelling agent. Additionally, the amount of PEG diffusion and water diffusion to and from the ceramic samples after 150 min of immersion in the liquid desiccant was correlated to the solution properties as was the final bulk density of the sintered samples. Furthermore, solutions with high molecular weight and low osmotic pressure resulted in low PEG gain and low water loss, while solutions with low molecular weight and high osmotic pressure resulted in high PEG gain and high water loss. In some cases, more than 40 wt% of the total water per sample was removed through the liquid desiccant drying process.
 [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Florida Agricultural and Mechanical Univ., Tallahassee, FL (United States). High-Performance Materials Inst.
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Ceramics International
Additional Journal Information:
Journal Volume: 43; Journal Issue: 18; Related Information: N/A; Journal ID: ISSN 0272-8842
Research Org:
Florida Agricultural & Mechanical Univ., Tallahassee, FL (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Contributing Orgs:
High-Performance Materials Institute and FAMU-FSU College of Engineering
Country of Publication:
United States
36 MATERIALS SCIENCE; Drying; Al2O3; Liquid desiccant
OSTI Identifier: