A study on natural coral stone—a fractal solid

Sarkar, Anasua; Sarkar, Aloke Kumar

doi:10.1007/s00339-012-7422-4

Cited by 5 publications

(5 citation statements)

References 5 publications

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“…It can be inferred that nano composites do not follow Ohm's law of conduction. These functional characters of NC's are also observed in ZnO nano structures [3,4]. Figure 2 shows the functional behaviour of conductance with applied voltage of the developed type I core-shell NC.…”

Section: Electrical Measurementsmentioning

confidence: 61%

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Experimental Investigation on Core Shell Nanocomposite of Cr1-xVxS2

Sarkar¹

2013

AMR

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Electrical and optical character of nanostructured Cr1-xVxS2 is studied here. This sulphide based nanoClusters (NC) was developed through chemical sol-gel route using (NH4)2Cr2O7 and NH4VO3 as active reagent and biopolymer gum acacia is used as capping agent. Core-shell NC has developed with sequential addition of active reagents in sulphation process. It is also possible to develop another type of core shell NC by reversal of the sequence of added reagents, i.e. interchanging the core and shell part. Experimental investigation including UV-VIS spectroscopy, dc current-voltage characteristics (CVC) have carried on. The results of CVC at room temperature (RT) show the distinctive features of localized energy levels. UV-VIS spectroscopic analysis shows absorption peak is blue shifted due to quantum confinement of nanoparticles. Overall appearance of optical absorption curve is completely different for two NCs. Peak positions are different for two types of core shell NC which confirms that the constituent materials of core and shell of two NC s has interchanged.

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Section: Electrical Measurementsmentioning

confidence: 61%

“…Figure 2 shows the functional behaviour of conductance with applied voltage of the developed type I core-shell NC. It has already established [3] that the period of oscillation in current is related to the size of the constituting nano particles. Figure 3 shows the CVC of type I sample treated under 6 Ton -cm -2 pressure.…”

Section: Electrical Measurementsmentioning

confidence: 99%

Experimental Investigation on Core Shell Nanocomposite of Cr1-xVxS2

Sarkar¹

2013

AMR

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“…The absorption peak at 3408 cm −1 is assigned to the stretching vibration of hydroxyl (-OH); The two successive peaks at 2982 cm −1 and 2917 cm −1 are due to the anti-symmetric stretching vibration of methyl (-CH 3 ) and the anti-symmetric stretching vibration of methylene (-CH 2 ), respectively; The weak absorption peak at 2844 cm −1 is attributed to the symmetric stretching vibration of methylene (-CH 2 ); The obviously peak at 2519 cm −1 is the combination frequency of anti-symmetric and symmetric stretching vibrations, and the peak locked at 1788 cm −1 is attributed to the stretching vibration of C=O [29,36,37]. The above results indicate that the coral used in this study is composed of inorganic substances (mainly containing carbonate ions) and organic substances (possibly proteins) [38].…”

Section: Characteristic Of Coral Powdermentioning

confidence: 62%

Properties and Microcosmic Mechanism of Coral Powder Modified Asphalt in Offshore Islands and Reefs Construction

Chen

Fang

et al. 2023

Sustainability

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The application of waste coral fragments from natural weathering, harbor construction and channel excavation to infrastructure construction on offshore islands can help alleviate the problems of shortage of traditional materials, land use of waste materials, and long-distances transport. In order to promote the comprehensive application of coral materials in road engineering construction on offshore islands, and to develop road pavement materials with good service performances and economic and environmental benefits, this paper studies the base properties, high-temperature rheological properties, and microstructure of coral powder (CP) modified asphalt through indoor experiments. The base properties tests (penetration, softening point and ductility) showed that the incorporation of CP increased the stiffness and high-temperature stability of the asphalt, but decreased the ductility of the asphalt. The optimal dosing of CP in virgin asphalt (VA) and styrene-butadiene-styrene-modified asphalt (SA) is 12% and 15%, respectively. The results of viscosity and high-temperature rheology tests showed that the right amount of CP could improve the high-temperature rheological properties and resistance to permanent deformation of asphalt, but superfluous CP tends to have a negative effect. Microscopic test results show that in the recommended dosage, the combination effect of CP and asphalt is better. CP-modified asphalt is mainly based on physical modification.

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“…5. The existence of steps and/or discontinuities in I-V characteristics are almost Coulomb charging like steps [1][2][3]. The thermal fluctuation effects and quantum tunneling effect appears to be competitive for these specimens.…”

Section: Wavelength In Nmmentioning

confidence: 99%

Characterization of Gd2O3 Nano Clusters

Paul¹,

Sarkar²

2013

AMR

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Gadolinium (Gd) is a weak magnetic element at room temperature. Gadolinium oxide (Gd2O3) is a poor semiconductor with para-magnetism. In this work Gadolinium oxide is prepared from the thermal dissociation of Gadolinium acetate. The average cluster size is found to be dependent on the number of the sintering time. In this present work an attempt has been made to characterize the developed Gadolinium oxide. Experimental probes used to characterize it are optical absorbance (UV-VIS); Fourier transformed infra red (FTIR) spectroscopy, DC current voltage characteristics (CVC) and photo-sensitivity studies of the developed specimens. Gadolinium oxide exhibits a good optical sensing property.

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A study on natural coral stone—a fractal solid

Cited by 5 publications

References 5 publications

Experimental Investigation on Core Shell Nanocomposite of Cr<sub>1-x</sub>V<sub>x</sub>S<sub>2</sub>

Experimental Investigation on Core Shell Nanocomposite of Cr<sub>1-x</sub>V<sub>x</sub>S<sub>2</sub>

Properties and Microcosmic Mechanism of Coral Powder Modified Asphalt in Offshore Islands and Reefs Construction

Characterization of Gd<sub>2</sub>O<sub>3</sub> Nano Clusters

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