investigation into surface energetics of rice hull ash particles using Inverse Gas Chromatography (IGC)

Silanol groups that are present on the surface of rice hull ash or silica ash fillers can positively influence the reinforcing character of the filler. However, being hydrophilic, they present the problem of aggregation and moisture absorption. Physicochemical contributions to reinforcement, provide...

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Bibliographic Details
Published in:Journal of materials science 2005-08, Vol.40 (16), p.4347-4353
Main Authors: Chaudhary, Deeptangshu S, Jollands, Margaret C
Format: Article
Language:English
Subjects:
absorption
Ashes
Chromatography
Dilution
energy
Enthalpy
Fillers
Free surfaces
Gas chromatography
Gibbs free energy
Heat treatment
Hulls
Hulls (structures)
hydrophilicity
Inverse gas chromatography
Investigations
Materials science
Moisture absorption
Organic chemistry
Parameter modification
Rice
rice hulls
silica
Silicon dioxide
Surface chemistry
Surface energy
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Summary:Silanol groups that are present on the surface of rice hull ash or silica ash fillers can positively influence the reinforcing character of the filler. However, being hydrophilic, they present the problem of aggregation and moisture absorption. Physicochemical contributions to reinforcement, provided by silanol groups, influence the filler-polymer and filler-filler interactions. In this study, we investigated the surface energetics of silica ash particles and the effect of chemical surface modification on the free surface energy of silica ash particles was studied.Inverse Gas Chromatography (IGC), a successful evaluation technique for the surface energy of solids, has been used at infinite dilution to determine the nature of surface interaction of various probes with a silica ash surface. The Gibbs free energies and enthalpies of specific interactions were also determined to estimate the acid-base characteristics of the surface of silica ash particles. The influence of heat treatment and surface modification upon the physicochemical parameters was also investigated. It was found that the silica ash surface is acidic in nature. Modification of the surface, by hydrophobization using silane agents, reduces the specific component of surface energy and could be expected to positively affect the reinforcing character. Surface modification reduced the specific component of surface energy by 80% and positively affects the filler-matrix interaction.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-005-2823-9