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Interdigit dielectrometry of water vapour induced changes in granular starch

Starzyk F.

Archives of Materials Science and Engineering

2008

Vol. 29, nr 1

30-35

Purpose: of this paper was a practical approval whether fringe field interdigit dielectrometry (FFID) can be useful for sensible monitoring of water molecules behavior within granular-starch-population sample during it’s humidification process. Design/methodology/approach: used was to design methodology and perform series of measurements involving calibration of a measuring system, sample preparation and to record initial stage of starch-granules population samples humidification process as dielectric parameters response on the step of ambient atmosphere relative humidity (~0 to ~100%) at room temperature. Findings: it was found that FFID enables to follow and isolate new features and characteristic stages of water vapors behavior during humidification of vacuum- dried starch granules population. The measurement of dielectric properties of freely stacked granules population with unperturbed inter-granular contacts areas differs from the one, during which this contacts are being broken. Research limitations/implications: the possibility of new insight into humidification of micro-granular matter sample (starch granules population). It implies the necessity of collective (of global scale) model of dielectric properties creation. The evolution of dielectric permittivity is correlated with mass increase (water dipoles number) and adsorption rate as well as with absorption of water molecules within the granules population. Dielectric energy losses are correlated with evolution of interaction between water molecules and bio-polymeric matrix. Practical implications: huge amounts starch granules are produced transported and stored so proper understanding of wheat response on humidity change is also of great practical importance. Originality/value: of this paper relays on the fact that FFID was applied for the first time to starch granules population and it turned out to be effective tool in monitoring and modeling of dielectric properties of microgranular matter population and for granular starch in particular. It is important in modeling of collective dielectric properties of this kind of matter as well as of practical reasons specified above.