Influence of humidity on dielectric properties of nanocrystalline cellulose – triglycine sulfate composites

Nguyen, Hoai Thuong; Сидоркин, А. С.; Milovidova, S. D.; Rogazinskaya, O. V.

doi:10.1080/00150193.2016.1204866

Cited by 21 publications

(5 citation statements)

References 9 publications

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“…The much higher activation energy of this process (DE DC ) for dextrindry (0.62 eV) is associated with very low amount of water molecules in sample (0.4 wt% according to the TGA curve). As it was expected, the presence of water lowers the proton hopping barrier (activation energy equaled to 0.44 eV), so electrical conductivity is much higher and electrode polarization occurs at higher temperatures (Nguyen et al 2016).…”

Section: Resultssupporting

confidence: 51%

Influence of water on the dielectric properties, electrical conductivity and microwave absorption properties of amorphous yellow dextrin

Radoń

Włodarczyk

2019

Cellulose

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Electrical conductivity as well as dielectric and microwave absorption properties of yellow dextrin were described. The studied material was in the form of milled and pressed tablets. It was found that the minor addition of water (5.4 wt% of water content) significantly changes the properties of tested absorber. The shift of c-relaxation was observed for water-saturated amorphous yellow dextrin. It was also confirmed, that the activation energy of this process has been significantly increased by a slight addition of water (0.45-0.62 eV). Mobility of water in the yellow dextrin-water system is also related to the increased conductivity of the sample. The yellow dextrin was found to be a great microwave absorber. Addition of water causes also the increase of microwave absorption properties (decrease of reflection loss from -2.37 to -17.29 dB and shielding efficiency from -9.09 to -36.84 dB for 1 cm sample thickness). Moreover, the highest absorption frequency region is being shifted by water towards lower frequencies (from 4.78 to 2.83 GHz).

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Section: Resultssupporting

confidence: 51%

Influence of water on the dielectric properties, electrical conductivity and microwave absorption properties of amorphous yellow dextrin

Radoń

Włodarczyk

2019

Cellulose

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“…As expected, this result could be attributed to the higher crystallinity of doped samples compared with CNF. The ac‐electrical conductivity σ ac is given by the following relation “fractional power law”:

σ_{ac} = σ_{dc} + A ω^{s}

where σ ac is ac‐electrical conductivity, σ dc is dc limit of conductivity at ω = 0, A is the constants reflecting the polarizability, ω is angular frequency, and S(T) is the frequency exponent; its values of s change in the range 0 to 1 representing the degree of interaction between mobile ions and its surrounding . S is a factor that depends on temperature and doping content, which gives information of suitable mechanism involved for ac‐electric conductivity.…”

Section: Resultsmentioning

confidence: 99%

“…For example, CNFs were used with complex K 2 Eu(MoO 4 )(PO 4 ) luminescent oxide particles to prepare new materials with photoluminescence properties . Nanocomposite materials with dielectric and ferroelectric properties were prepared from cellulose nanocrystals and triglycine sulfate . Cellulose nanofibers/graphine oxide nanocomposites flexile films with enhanced dielectric properite were prepared and recommended from energy storage applications .…”

Section: Introductionmentioning

confidence: 99%

Novel cellulose nanofibers/barium titanate nanoparticles nanocomposites and their electrical properties

Hassan

Ali

Salama

et al. 2018

J of Physical Organic Chem

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Green nanocomposite films from cellulose nanofibers/barium titanate (CNF/BT) with high homogeneity were successfully prepared by doping different ratio of BT nanoparticles (2.5 to 25 wt%) into CNF. Scanning electron microscope images showed homogenous distribution of BT in the CNF matrix. Thermogravimetric analysis results showed good thermal stability of the prepared nanocomposites. X‐ray diffraction analysis showed that the tetragonality of BT grains was retained in the composite samples. Addition of BT nanoparticles to CNF resulted in decreasing the tensile strength properties of the films. The dielectric properties were analyzed in detail with respect to frequency ranged from 0.1 Hz to 5 MHz, temperature ranged from 289 to 373 K, and BT loading. The high k values of the CNF/BT films were attributed to spontaneous polarization of BT particles. The dielectric constant of the nanocomposites increased by addition of BT nanoparticles up to 5 wt% and decreased afterwards. Hopping ionic conduction was proved as a conduction mechanism of the prepared nanocomposites. The activation energy of the conduction ranged from 0.4 to 0.08 eV. Moreover, the values of activation energy decreased as the doping level of BT nanoparticles increased.

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“…Commonly used llers for nanocellulose based high dielectrics are ceramic llers (e.g., barium titanate, 12 titanate dioxide 13 ) and conductive llers (e.g., silver nanowires, 3,14 graphene, [15][16][17][18] triglycine sulfate (TGS), [19][20][21][22] polyaniline (PANI), 23,24 carbon nanotubes 25 ). High dielectric nanocellulose/ceramic composites usually demand high ller loading (>50 wt%), leading to severe agglomerations, poor mechanical properties, and low breakdown strength.…”

Section: Introductionmentioning

confidence: 99%

Flexible high dielectric thin films based on cellulose nanofibrils and acid oxidized multi-walled carbon nanotubes

Tao

Cao

2020

RSC Adv.

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Influence of humidity on dielectric properties of nanocrystalline cellulose – triglycine sulfate composites

Cited by 21 publications

References 9 publications

Influence of water on the dielectric properties, electrical conductivity and microwave absorption properties of amorphous yellow dextrin

Influence of water on the dielectric properties, electrical conductivity and microwave absorption properties of amorphous yellow dextrin

Novel cellulose nanofibers/barium titanate nanoparticles nanocomposites and their electrical properties

Flexible high dielectric thin films based on cellulose nanofibrils and acid oxidized multi-walled carbon nanotubes

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