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4 results on '"Muntele, I. C."'

1. Growth of periodic nano-layers of nano-crystals of Au, Ag, Cu by ion beam

Author

Smith, Cydale C, Zheng, B, Muntele, C. I, Muntele, I. C, and Ila, D

Subjects
Solid-State Physics
Abstract

Multilayered thin films of SiO2/AU+ SiO2/, SiO2/Ag+ SiO2/, and SiO2/Cu+ SiO2/, were grown by deposition. We have previously shown that MeV ion Bombardment of multi-nano-layers of SiO2/AU+ SiO2/ produces Au nanocrystals in the AU+ SiO2 layers. An increased number of nano-layers followed by MeV ion bombardment produces a wide optical absorption band, of which its FWHM depends on the number of nano-layers of SiO2/AU+ SiO2/. We have successfully repeated this process for nano-layers of SiO2/Ag+ SiO2/, and SiO2/Cu+ SiO2/. In this work we used 5 MeV Si as the post deposition bombardment ion and monitored the location as well as the optical absorption's FWHM for each layered structure using Optical Absorption Photospectrometry. The concentration and location of the metal nano-crystals were measured by Rutherford Backscattering Spectrometry. We will report on the results obtained for nano-layered structures produced by post deposition bombardment of SiO2/AU+ SiO2/, SiO2/Ag+ SiO2/, and SiO2/Cu+ SiO2/ layered systems as well as the results obtained from a system containing a periodic combination of SiO2/AU+ SiO2/, SiO2/Ag+ SiO2/, and SiO2/Cu+ SiO2/.

Published
2005

3. Studying the destruction of various fluoropolymers caused by y-irradiation and MeV protons

Author

Allayarov, S. R., Muntele, C. I., Muntele, I. C., lla, D., Yu, A., OIkhov, S.R, Nikolskii, V. G., Gordon, D. A., Dixon, D. A., and Kispert, L. D.

Subjects
ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика [ЭБ БГУ]
Abstract

While fluoropolymers are normally used as anti-adherent coating, they are intensely investigated for potential use in various radiation dosimeter applications as well as space technology. In order to understand the discrepancy between high chemical and thermal stability and low radiation stability of various fluoropolymers, we are bombarding them with 1 MeV protons to fluences up to 2*10^15 protons/cm^2 as well as subjected some of them to у-irradiation by dose of 10 kGy. During bombardment we are monitoring the emission of chemical species with a residual gas analyzer (RGA). у - irradiated samples were tested by Radio thermoluminescence (RTL) method. The results we present here are a good indicator that material damage happens much earlier than 2*10^15 protons/cm^2 and that further work should be addressed at much smaller exposures. RTL also can be used at small doses of Irradiation (10-30 kGy). The thermomechanical curve (TMC) of radiation-free polyvlnyledenefluoride (PVDF) is characteristic for topologlcally di-block amorphous polymer of quasi-crossing structure. In the temperature range of from 173 К up to 228 К polymer is vitrified. The vitrification temperature of PVDF is 228 K. All molecular-relaxation and quantitative characteristics of PVDF were determined before and after its Irradiation by protons. Protons caused significant changes in PVDF. From di-block amorphous it transformed in to amorphous-crystalline structure. An appreciable influence of dose at proton irradiation of polymer was revealed both on topological level and on molecular-relaxation one.

Published
2007

4. Double alignment channeling at CIM—Alabama A&M University.

Author

Muntele, I. C., Muntele, C. I., Ila, D., and Zimmerman, R. L.

Subjects
*CHANNELING (Physics)
Abstract

Using a 5SDH-2 tandem accelerator, at the Center for Irradiation of Materials of Alabama A&M University we have developed facilities for ion beam based studies of materials, such as PIXE, RBS/Channeling, NRA/Hydrogen Profiling. The RBS/Channeling setup (experimental chamber and attached software for data acquisition and analysis), provided by NEC, has a goniometer with 4 degrees of freedom, two linear upon the x and z axes, and two rotational upon the theta (around the z axis) and phi (upon the y axis — beam axis). We designed an addition to this setup to allow us to perform double alignment channeling. A description of the setup, as well as double alignment channeling results are presented in this paper. [ABSTRACT FROM AUTHOR]

Published
2001

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