Satinder Kumar; S. P. Lochab;Ravi Kumar; Arvind K. Gathania; Ankush Vij; A. K. Sharma; R. Dogra
Abstract
We synthesized single phase pure and Eu doped LiF having micro-cubical morphology by modified co-precipitation method. The complete solid solubility of Eu in LiF has been observed up to 0.04 mol% and afterwards phase segregation started. The absorption spectra of pure and Eu doped LiF revealed the formation ...
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We synthesized single phase pure and Eu doped LiF having micro-cubical morphology by modified co-precipitation method. The complete solid solubility of Eu in LiF has been observed up to 0.04 mol% and afterwards phase segregation started. The absorption spectra of pure and Eu doped LiF revealed the formation of γ-irradiation induced and dose dependent F, M and F3 color centers at room temperature. The concentrations of both F and M color centers calculated by using Smakula’s formula, increased almost ten times for γ- irradiated Eu doped LiF in comparison to γ-irradiated pure LiF. Non irradiated LiF doesn’t show any photoluminescence (PL) signal. However, γ-irradiated LiF showed broad emission peak around 681 nm, which is due to the excitation of F2 color centers. The Eu doped LiF samples exhibit PL emission peaks at 577, 591, 612, 648 and 690-698 nm correspond to Eu 3+ ion transitions from 5D0 to 7 FJ (J=0,1,2,3,4). The γ-irradiated Eu doped LiF show simultaneous PL emission spectrum of Eu 3+ ions and radiation induced F2 color centers. Thermoluminescence (TL) glow curves of γ- irradiated LiF and LiF: Eu (0.03 mol %) samples were also investigated and various trapping parameters for were evaluated by using Chen’s peak shape method
R. Singhal; A. Tripathi; D. K. Avasthi
Abstract
Electrically conducting carbon nanowires, all parallel to each other and embedded in fullerene C70 matrix are created by swift heavy ion irradiation of thin fullerene C70 film at low fluences (up to 10 10 ions/cm 2 ). The conductivity of the wires is several orders of magnitude higher than the surrounding ...
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Electrically conducting carbon nanowires, all parallel to each other and embedded in fullerene C70 matrix are created by swift heavy ion irradiation of thin fullerene C70 film at low fluences (up to 10 10 ions/cm 2 ). The conductivity of the wires is several orders of magnitude higher than the surrounding material and it is due to the transformation of fullerene into amorphous carbon within each ion hit zone. These conducting nanowires are evidenced by conducting atomic force microscopy. The typical diameter of the conducting tracks is observed to be about 11-21 nm.
V. Sarath Chandra; K. Elayaraja; R. V. Suganthi; M. I. Ahymah Joshy; I. Sulania; P.K. Kulriya; K. Asokan; D. Kanjilal; S. Narayana Kalkura
Abstract
Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is the main inorganic component of hard tissues like bone and teeth. HAp incorporated with magnetic ions, play an important role in cell separation, magnetic resonance imaging (MRI), targeted drug delivery and in hyperthermia treatment of cancer. In this study, the ...
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Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is the main inorganic component of hard tissues like bone and teeth. HAp incorporated with magnetic ions, play an important role in cell separation, magnetic resonance imaging (MRI), targeted drug delivery and in hyperthermia treatment of cancer. In this study, the effect of 60 MeV Si 5+ ion on the hydrothermally synthesized Fe 3+ doped hydroxyapatite (Fe-HAp, 33 nm) was investigated. At higher fluences, partial amorphization with an increase in the cluster size and surface roughness was observed. Depending on the ion fluence, pores ranging from 300 to 360 nm in size were produced. Irradiated Fe-HAp samples showed enhanced haemocompatibility and bioactivity. The drug (amoxycillin, AMX) loaded irradiated samples exhibited high antimicrobial activity.
