Time domain dielectric spectroscopy. A new effective tool for physical chemistry investigation

Feldman, Yuri; Zuev, Yu. F.; Polygalov, E.; Fedotov, V. D.

doi:10.1007/bf00776148

Cited by 48 publications

(15 citation statements)

References 76 publications

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“…Various techniques over wide ranges of frequency were developed with the presence of suitable equipment for time-domain measurements [40] that have been improved for accuracy [41]. This will enable faster investigations due to the shorter measurement time needed compared with FDS.…”

Section: Dielectric Sensing Techniquesmentioning

confidence: 99%

Fruit and Vegetable Quality Assessment via Dielectric Sensing

Khaled

Novas

Gázquez

et al. 2015

Sensors

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The demand for improved food quality has been accompanied by a technological boost. This fact enhances the possibility of improving the quality of horticultural products, leading towards healthier consumption of fruits and vegetables. A better electrical characterization of the dielectric properties of fruits and vegetables is required for this purpose. Moreover, a focused study of dielectric spectroscopy and advanced dielectric sensing is a highly interesting topic. This review explains the dielectric property basics and classifies the dielectric spectroscopy measurement techniques. It comprehensively and chronologically covers the dielectric experiments explored for fruits and vegetables, along with their appropriate sensing instrumentation, analytical modelling methods and conclusions. An in-depth definition of dielectric spectroscopy and its usefulness in the electric characterization of food materials is presented, along with the various sensor techniques used for dielectric measurements. The collective data are tabulated in a summary of the dielectric findings in horticultural field investigations, which will facilitate more advanced and focused explorations in the future.

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Section: Dielectric Sensing Techniquesmentioning

confidence: 99%

Fruit and Vegetable Quality Assessment via Dielectric Sensing

Khaled

Novas

Gázquez

et al. 2015

Sensors

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“…6 The recent development of the time-domain reflectometry (TDR) method has made dielectric measurement easy and fast, and it continuously provides absorption and dispersion data in the frequency region from 100 kHz up to 20 GHz. [7][8][9][10] The microwave dielectric measurements, using the TDR method, have been performed on water-organic-solvent mixtures, 11 water-monomer mixtures, 12 and water-polymer mixtures 13 to investigate the water structure.…”

Section: Introductionmentioning

confidence: 99%

Microwave Dielectric Study of Water Structure in the Hydration Process of Cement Paste

Miura

Shinyashiki

Yagihara

et al. 1998

Journal of the American Ceramic Society

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Microwave dielectric relaxation measurements, via the time-domain reflectometry method, were performed on portland cement paste for the first time, and the water structure during the hydration process was observed. The relaxation process due to the orientation of free water, which is independent of calcium silicate hydrate (C-S-H), was observed at ∼10 GHz. The relaxation strength, in proportion to the amount of free water, decreased rapidly as the curing time increased for the first three days. This change is in good agreement with that of a chemical reaction that was reported by measurements of the heat that is evolved during hydration. The free water is taken into C-S-H and is transformed to hydrated water by the hydration process. When hydration proceeds, the relaxation processes due to the orientation of the hydrated water in C-S-H occur at ∼100 MHz and 1 MHz.

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“…Most generally, the governing equations which describe dielectric analysis (DEA) are similar to those described above for DMA only the elastic and viscous component of the response can be replaced by the dielectric permittivity and the dielectric loss associated with the respective oscillating perturbations (i.e., mechanical or electrical). Alternatively, DEA can also be conducted in the time domain in which case the response to a potential is measured as a function of time as opposed to frequency (Feldman et al 1992;Bhugra et al 2008a). Although DEA can be used to detect crystallization from an amorphous matrix (Alie et al 2004;Bhardwaj et al 2013;Suryanarayanan 2011, 2012a, b;Bhattacharya and Suryanarayanan 2009;Bhugra et al 2007Bhugra et al , 2008bDantuluri et al 2011) and amorphous-amorphous phase separation (Power et al 2007), it is a particularly appealing tool for measuring molecular motions in amorphous materials since it provides access to both cooperative and noncooperative (local or secondary relaxations) motions.…”

Section: Dielectric Analysis and Thermally Stimulated Currentmentioning

confidence: 99%