Influence of synthesis parameters on sol–gel transition and physical properties of Nb2O5 mesoporous ambigels
Source abstract
Abstract
In this study, Nb2O5 alcogels and mesoporous ambigels were formed via a new acid-catalyzed polymeric synthesis pathway using NbCl5 as a precursor. The effect of hydrolysis, catalyst, and propylene oxide molar ratios on sol–gel transition, rheological properties, and physical properties of Nb2O5 ambigels were investigated. A common behavior for the sol–gel transition of Nb2O5 on the viscosity vs. time curves was identified. The molar ratios of H2O:Nb+5 and HNO3:H2O significantly influenced the gelation time, the rheological properties of alcogels, as well as the physical properties of the respective ambigels. The gels presented yield stress and shear-thinning behavior with different degrees of thixotropy. Microstructure analysis of the ambigels revealed a mesopore network formed by interconnected Nb2O5 nanoparticles. An increase in the molar ratios of HNO3:H2O (lower pH) increased the surface area and pore volume of Nb2O5, and yielded a finer nanostructure of Nb2O5 mesoporous ambigels.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Aerogels and thermal insulation · Mesoporous Materials and Catalysis · Supercapacitor Materials and Fabrication
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (44)
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