Dielectric and magnetic properties of Allium cepa and Raphanus sativus extracts biogenic ZnO nanoparticles

Saravanan, P.; SenthilKannan, K.; Mustafa, A.; Vimalan, M.; Bououdina, M.; Balasubramanian, S.; Meena, M.; Tamilselvan, S.

doi:10.1007/s10854-020-04841-2

Cited by 20 publications

(6 citation statements)

References 38 publications

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“…[ 57 ] The

\left(\epsilon\right)_{r}

values under 50 Hz recorded at 24 °C for pure ZnO as well as at temperatures above 100 °C for ZnO0 and ZnO10 are significantly very large. [ 5,66 ] In contrast, at steady temperatures and in the lower frequency region, the

\left(\epsilon\right)_{\text{r}}

values are significantly reduced with increase of particle size of the ZnO NPs (e.g., at 50 Hz and 24 °C,

\left(\epsilon\right)_{\text{r}}

for ZnO0 = 1040 and

\left(\epsilon\right)_{\text{r}}

for ZnO10 = 55). The anomalous

\left(\epsilon\right)_{\text{r}}

( T ) behavior observed for ZnO0 below 100 °C at frequencies smaller than 10 kHz is discussed later in detail.…”

Section: Resultsmentioning

confidence: 99%

“…Increase of dielectric constant with increase of temperature is a well‐known phenomenon. [ 66 ] The increase in

\left(\epsilon\right)_{r}

values with temperature is due to greater freedom of movement of the nanodipoles within the sample at higher temperatures. At comparatively lower temperatures, these dipoles are comparatively rigidly fixed and the applied field cannot move the dipoles significantly.…”

Section: Resultsmentioning

confidence: 99%

“…[ 58–65 ] Though it is now established that the plant extracts meaningfully control the size and energy band of the ZnO NPs, there are only few reports on the dielectric studies of the green‐synthesized ZnO NPs. [ 5,66–70 ]…”

Section: Introductionmentioning

confidence: 99%

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Dielectric Property, AC Conductivity, and Electric Modulus Studies of Pristine and Green‐Synthesized ZnO Nanoparticles

Sarkar,

Kundu,

Bhattacharjee

2024

Physica Status Solidi (a)

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Frequency‐dependent dielectric constant and dielectric loss of pristine and green‐synthesized (using Tabernaemontana divaricata flower extract) ZnO nanoparticles (NPs) are studied at different temperatures. Below 1 kHz frequency and at temperatures above 100 °C, ZnO NPs have giant dielectric constant values (≈3 × 104). At lower frequencies and at/below 100 °C, the nature of temperature dependence of dielectric constant for pristine and green‐synthesized ZnO NPs are reversed, and this anomalous temperature dependence is correlated with the in‐plane and out‐of‐plane thermal expansions of ZnO. A temperature‐dependent poly‐dispersive relaxation mechanism in ZnO has been observed. The electrical conduction mechanism is found to be significantly modulated by the use of flower extract. The electric modulus study suggests similar mechanism of electrical conduction and dielectric polarization followed in these materials. A plausible growth mechanism of the ZnO NPs in presence of the flower extract is explored. Variations in the dielectric constant, dielectric loss, conductivity, and polarization mechanisms of the ZnO NPs are understood as signatures of the capping effect of the phytochemicals present in the flower extract on the crystal growth and formation of grain boundaries.

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“…[ 57 ] The

\left(\epsilon\right)_{r}

\left(\epsilon\right)_{\text{r}}

values are significantly reduced with increase of particle size of the ZnO NPs (e.g., at 50 Hz and 24 °C,

\left(\epsilon\right)_{\text{r}}

for ZnO0 = 1040 and

\left(\epsilon\right)_{\text{r}}

for ZnO10 = 55). The anomalous

\left(\epsilon\right)_{\text{r}}

( T ) behavior observed for ZnO0 below 100 °C at frequencies smaller than 10 kHz is discussed later in detail.…”

Section: Resultsmentioning

confidence: 99%

“…Increase of dielectric constant with increase of temperature is a well‐known phenomenon. [ 66 ] The increase in

\left(\epsilon\right)_{r}

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Dielectric Property, AC Conductivity, and Electric Modulus Studies of Pristine and Green‐Synthesized ZnO Nanoparticles

Sarkar,

Kundu,

Bhattacharjee

2024

Physica Status Solidi (a)

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“…Grain MC significantly affected dehulling performance, and the study provided dehulling efficiencies for different millet varieties. Saravanan et al (2021) developed an environmentally friendly CIAE‐Millet Mill with a pneumatic suction system, capable of simultaneously dehulling small millets. The mill achieved dehulling efficiencies in the range of 70%–85% for various minor millets.…”

Section: Millets Dehulling/pearlingmentioning

confidence: 99%

Review on millets dehulling and pearling technologies and machinery

Mittal,

Kumar,

Gupta

et al. 2024

J Food Process Engineering

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This paper presents a comprehensive analysis of recent advancements in the mechanization of millet processing technologies. In the last decade, many researchers have worked on millet postharvest processing technologies and developed many machines; however, there is a lack of collective information. The design, development, and performance aspects of millet threshing, dehulling/pearling, and cleaning are comprehensively reviewed and discussed in this review. Various studies are examined, which explore these machines' operational parameters and performance. The findings highlight the significant improvements in threshing and pearling efficiency, grain damage reduction, and ergonomic benefits in comparison to traditional manual methods. This comprehensive review of millet machinery helps to identify the research gap and establish a platform for optimum design and development for the future. Additionally, this helps to improve the level of mechanization in millet processing. The paper contributes valuable insights into improving postharvest processing methods for various millet varieties, thus aiding in promoting the utilization and commercialization of these nutritious and sustainable crops.Practical applicationsUnderstanding of engineering properties of millets for further development and improvement of available millet dehulling machinery. The knowledge of factors involved in millet dehulling and pearling helps in testing and evaluation of millet processing machinery. The comprehensive information about the millet machinery improve mechanization of the millet‐based industries.

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“…The point at which the space charge can no longer support and conform to the external field is as frequency rises. A low dielectric constant is frequently preferred for a variety of applications, such as high-speed integrated packages, which call for materials with a dielectric constant of less than 3.5 and minimal dielectric loss, and satellite communication applications, which need materials with a dielectric constant of 2.5 [ [13] , [14] , [15] , [16] , [17] , [18] ].…”

Section: Introductionmentioning

confidence: 99%

Tunable luminescence and electrical properties of cerium doped strontium aluminate (SrAl2O4:Ce3+) phosphors for white LED applications

P²,

Sasikumar

et al. 2023

Heliyon

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Dielectric and magnetic properties of Allium cepa and Raphanus sativus extracts biogenic ZnO nanoparticles

Cited by 20 publications

References 38 publications

Dielectric Property, AC Conductivity, and Electric Modulus Studies of Pristine and Green‐Synthesized ZnO Nanoparticles

Dielectric Property, AC Conductivity, and Electric Modulus Studies of Pristine and Green‐Synthesized ZnO Nanoparticles

Review on millets dehulling and pearling technologies and machinery

Tunable luminescence and electrical properties of cerium doped strontium aluminate (SrAl2O4:Ce3+) phosphors for white LED applications

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