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RISS 인기검색어
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- 저자 : N. Chandel (검색결과 4 건)
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N. Chandel,N. Mehta,A. Kumar 한국물리학회 2012 Current Applied Physics Vol.12 No.2
The a.c. conductivity of a-Se80Te20 and a-Se80Te10M10 (M ¼ Cd, In, Sb) alloys has been investigated as a function of temperature in the range from 280 to 330 K and frequency in the range from 102 to 104 Hz. The experimental results indicate that a.c. conductivity sac is proportional to us where s < 1 and decreases with increasing temperature. The results obtained are discussed in terms of the correlated barrier hopping (CBH) model. An agreement between experimental and theoretical results suggests that the a.c. conductivity behavior of a-Se80Te20 and a-Se80Te10M10 (M ¼ Cd, In, Sb) system can be successfully explained by CBH model. The contribution of single polaron and bipolaron hopping to a.c. conductivity in present alloys is also studied. The a.c. conductivity of a-Se80Te20 and a-Se80Te10M10 (M ¼ Cd, In, Sb) alloys has been investigated as a function of temperature in the range from 280 to 330 K and frequency in the range from 102 to 104 Hz. The experimental results indicate that a.c. conductivity sac is proportional to us where s < 1 and decreases with increasing temperature. The results obtained are discussed in terms of the correlated barrier hopping (CBH) model. An agreement between experimental and theoretical results suggests that the a.c. conductivity behavior of a-Se80Te20 and a-Se80Te10M10 (M ¼ Cd, In, Sb) system can be successfully explained by CBH model. The contribution of single polaron and bipolaron hopping to a.c. conductivity in present alloys is also studied.
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Kailasa, Suresh Kumar,Chandel, Madhurya,Mehta, Vaibhavkumar N.,Park, Tae Jung Elsevier 2018 Spectrochimica acta. Part A, Molecular and biomole Vol.195 No.-
<P><B>Abstract</B></P> <P>In this work, we describe the role of ligand chemistry on the surfaces of silver nanoparticles (Ag NPs) for tuning their analytical applications. The citrate and melamine (MA) molecules were used as ligands for the surface modification of Ag NPs. The addition of Cr<SUP>3+</SUP> ion in citrate-Ag NPs (Cit-Ag NPs) and of Hg<SUP>2+</SUP> ion in melamine-Ag NPs (MA-Ag NPs) cause Ag NPs aggregation, and are accompanied by a color change and a red-shift. The resulting distinctly visual readouts are favorable for colorimetric detection of Cr<SUP>3+</SUP> and Hg<SUP>2+</SUP> ions. Under optimal conditions, the linear ranges are observed in the concentration ranges of 1.0–50.0 and of 10.0–100.0 μM, and with detection limit of 0.52 and 1.80 μM for Cr<SUP>3+</SUP> and Hg<SUP>2+</SUP> ions. The simultaneous detection of Cr<SUP>3+</SUP> and Hg<SUP>2+</SUP> ion is driven by the changing the ligand chemistry on the surfaces of Ag NPs that allows to tune their specific interactions with target analytes. Finally, the functionalized Ag NPs were successfully applied to detect Cr<SUP>3+</SUP> and Hg<SUP>2+</SUP> ions in water samples with satisfactory recoveries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Tuning of Ag NPs colorimetric sensing applications with ligand chemistry </LI> <LI> Citrate- and MA-Ag NPs show high selectivity towards Cr<SUP>3+</SUP> and Hg<SUP>2+</SUP> ions over other metal ions. </LI> <LI> The sensors exhibit good linearities for Cr<SUP>3+</SUP> and Hg<SUP>2+</SUP> ion with limits of detection at micromolar range. </LI> <LI> This method was successfully applied to detect both ions in water samples. </LI> <LI> The developed sensors exhibit good accuracy and precision. </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>Schematic representation of influence of ligand chemistry on Ag NPs surfaces for tuning of their analytical applications.</P> <P>[DISPLAY OMISSION]</P>
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Dielectric and Optical Study of Polymer Nematic Liquid Crystal Composite
Manohar, S.,Shukla, S.N.,Chandel, V.S.,Shukla, J.P.,Manohar, R. The Korean Institute of Electrical and Electronic 2013 Transactions on Electrical and Electronic Material Vol.14 No.3
The dielectric anisotropy and dispersion of the real and imaginary part of the permittivity of commercially important nematic mixture E-24 and its polymer composite were investigated in the frequency range from 1 kHz to 10 MHz, and temperature range $14^{\circ}C$ to $55^{\circ}C$. The percentage optical transmittance and density have also been measured for both the systems. The results have been explained by assuming molecular rotation about the long molecular axis, under a hindering nematic potential. The dielectric anisotropy ${\Delta}{\varepsilon}$ is positive, and the mean dielectric permittivity falls with rising temperature. ${\Delta}{\varepsilon}$ is also used to determine the order parameter with varying temperature.
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Dielectric and Optical Study of Polymer Nematic Liquid Crystal Composite
S. MANOHAR,V. S. CHANDEL,S. N. SHUKLA,J. P. SHUKLA,R. MANOHAR 한국전기전자재료학회 2013 Transactions on Electrical and Electronic Material Vol.14 No.3
The dielectric anisotropy and dispersion of the real and imaginary part of the permittivity of commercially important nematic mixture E-24 and its polymer composite were investigated in the frequency range from 1 kHz to 10 MHz, and temperature range 14℃ to 55℃. The percentage optical transmittance and density have also been measured for both the systems. The results have been explained by assuming molecular rotation about the long molecular axis, under a hindering nematic potential. The dielectric anisotropy Δε is positive, and the mean dielectric permittivity falls with rising temperature. Δε is also used to determine the order parameter with varying temperature.
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