Synthesis of Platinum nanoparticles by Gamma Radiolysis

AbstractThe synthesis of Platinum (Pt) nanoparticles by gamma irradiation is presented. The 0.1 M Pt solution of different concentration was prepared from K2PtCl4. The platinum aqueous solutions were irradiated by gamma radiation at a dose of 70, 90 and 120 kGy. The findings show the effect of irradiation on PtII solutions with different concentrations. The big black particles that are fairly agglomerated when the concentration was above 0.0050 M were observed. The UV-Vis spectrum of Pt of different concentrations shows a strong absorption peak at the wavelength 261 nm after irradiation, which indicates the presence of platinum nanoparticles. Furthermore, FTIR, XRD and HRTEM images also confirmed the presence of the nanoparticles produced by Radiolysis. The size of the Pt nanoparticles was found to be 7.39 nm.

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Highly Tm Doped Silica Optical Preform by MCVD - Chelate Vapor Delivery (Soot-Dopant Stepwise Technique)

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.780.57 ◽

2018 ◽

Vol 780 ◽

pp. 57-61 ◽

Cited By ~ 2

Author(s):

K.A. Mat-Sharif ◽

Nasr Y.M. Omar ◽

M.I. Zulkifli ◽

S.Z. Muhd-Yassin ◽

Y.K. Sin ◽

...

Keyword(s):

Refractive Index ◽

Absorption Spectrum ◽

Chemical Vapor Deposition ◽

Vapor Deposition ◽

Chemical Vapor ◽

Absorption Peak ◽

Strong Absorption ◽

Silica Fiber ◽

Index Variation ◽

Strong Absorption Peak

This paper presents the progress in the fabrication of highly doped thulium silica fiber. As much as 5.3 wt. % Tm alongside 7.1 wt. % Al (co-dopant) were incorporated into silica preform. The preform was fabricated using the Modified Chemical Vapor Deposition (MCVD)-chelate vapor delivery with soot-dopant stepwise technique. The preform was analyzed for several key properties such as refractive index variation along deposition length, dopants distribution profiles and UV-Vis absorption. The results showed a homogeneous dopants distribution with 4% RSD in the longitudinal refractive index along a 40 cm preform length. The UV-Vis absorption spectrum exhibited a strong absorption peak at 790 nm attributed to Tm 3H4 energy manifold.

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Colorimetric determination of ascorbic acid based on carbon quantum dots as peroxidase mimetic enzyme

RSC Advances ◽

10.1039/d0ra02105a ◽

2020 ◽

Vol 10 (25) ◽

pp. 14953-14957 ◽

Cited By ~ 1

Author(s):

Xin Shu ◽

Yuwai Chang ◽

Huizhong Wen ◽

Xiaotiao Yao ◽

Yilin Wang

Keyword(s):

Quantum Dots ◽

Ascorbic Acid ◽

Carbon Quantum Dots ◽

Absorption Peak ◽

Strong Absorption ◽

Colorimetric Determination ◽

Mimetic Enzyme ◽

Peroxidase Mimetic ◽

Strong Absorption Peak

Carbon quantum dots (CQDs) were synthesized from litchi peel, exhibiting a peroxidase-like activity and enabling the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in association with H2O2 to generate blue oxidized TMB (ox-TMB) with a strong absorption peak at 652 nm.

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Influence of alpha and gamma radiolysis on Pu retention in the solvent TBP/kerosene

Nukleonika ◽

10.2478/nuka-2014-0024 ◽

2014 ◽

Vol 59 (4) ◽

pp. 123-128 ◽

Cited By ~ 7

Author(s):

Yang Gao ◽

Weifang Zheng ◽

Xiaoming Cao ◽

Shaolei Chen

Keyword(s):

Gamma Radiation ◽

Gamma Irradiation ◽

Volume Fraction ◽

Degradation Products ◽

Absorbed Dose ◽

Solvent System ◽

Radiation Stability ◽

Purex Process ◽

Washing Process ◽

Gamma Radiolysis

Abstract In light of the issue of radiolysis of the solvent system in PUREX process, alpha and gamma radiation stability of tributyl phosphate (TBP)/kerosene (OK) have been studied in this paper, in which 238Pu dissolved in the organic phase and 60Co are selected as alpha and gamma irradiation sources, respectively. The amount of the degradation products not easily removed after the washing process has been measured by the plutonium retention. The effects of the absorbed dose, the TBP volume fraction, the cumulative absorbed dose and the presence of UO2 2+ and Zr4+ on the radiolysis of the solvents have been investigated. The results have indicated that the Pu retention increases with the increase of the absorbed dose after alpha or gamma irradiation, and is larger for the solvent containing less TBP. There is competition between UO2 2+ and Pu4+ to complex with the degradation products, and Zr4+ accelerates the radiolysis of the system.

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Band-To-Band Transitions in Poly (Phenyl Methyl Silane)

MRS Proceedings ◽

10.1557/proc-173-453 ◽

1989 ◽

Vol 173 ◽

Cited By ~ 3

Author(s):

R. G. Kepler ◽

J.M. Zeigler

Keyword(s):

Experimental Data ◽

Band Gap ◽

Quantum Efficiency ◽

Photon Energy ◽

Absorption Peak ◽

Strong Absorption ◽

Exciton Band ◽

Carrier Generation ◽

Strong Absorption Peak

ABSTRACTWe have measured the quantum efficiency for carrier generation as a function of photon energy and the electroabsorption spectrum in poly (phenyl methyl silane). The experimental data are consistent with a band gap of about 4.6 eV. A strong absorption peak which is observed at 3.7 eV is shown to be an exciton band.

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THE EFFECT OF GAMMA STERILIZATION AND ITS EFFECT ON MICROSCOPIC STRUCTURE OF DEEP FROZEN DOG SKULL

Journal of Medicine and Pharmacy ◽

10.34071/jmp.2018.2.6 ◽

2018 ◽

pp. 37-40

Author(s):

Phuong Thao Tien Nguyen ◽

Anh Hung Tran ◽

Van Tam Le ◽

Huu Thao Phung ◽

Phan Quynh Anh Nguyen

Keyword(s):

Structural Change ◽

Gamma Radiation ◽

Gamma Irradiation ◽

Key Words ◽

Bone Matrix ◽

Infected Tissue ◽

Microscopic Structure ◽

Bacteriological Examination ◽

Microscopic Scale

Objective: To evaluate the effect of gamma sterilization and its effect on microscopic structure of deeply frozen dog skull. Subjects and methods: 50 pairs of dog skull fragments have the same size,which were taken symmetrically through the midline of the skull, were divided into two lots. Evident lot consisting of 50 pieces are just deeply frozen, not irradicated. Experimental lot which was composed of 50 pieces were deeply frozen and exposed to 25kGy of gamma radiation. Afterwards, to evaluate the effect of gamma sterilization and compare the alter of bone matrix between lot groups. Results: After gamma irradiation, all dog skull fragments were negative with bacteriological examination. In microscopic scale, no difference was found between the two lots and there was no structural change in the irradiated fragments of all dog skull. Conclusion: Gamma irradiation with 25 kGy: (i) It has the ability to kill bacteria completely in the type of bacteria commonly infected tissue. (ii) It does not alter the structure of dog skull in microstructures. Key words: dog skull, gamma, sterilize

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