Changes in the structure and conducting properties of copper nanotubes as a result of bombardment with O<Superscript>3+</Superscript> ions

The results of targeted modification of the structure and properties of copper nanotubes by accelerated O³⁺ ions at a fluence of 1 × 10⁹ to 5 × 10¹¹ cm^?2 with an energy of 1.75 MeV/nucleon are reported. XHray diffraction methods have been used to study the dynamics of changes in the crystallite shape, dislocation density, and the orientation of copper nanotubes before and after irradiation. It has been shown that irradiation with accelerated ions has a significant effect on the change in texture coefficients and dislocation density. At a fluence of 1 × 10¹⁰ cm^?2 or higher, the accumulation of oxygen in the nanotube structure is observed, which leads to the appearance of oxide compounds.     

Structural and Conductive Characteristics of Fe/Co Nanotubes

The properties of Fe/Co nanotubes, which were fabricated by the method of electrochemical template synthesis, are studied. It is shown that the atomic ratio between the metals in the nanotubes shifts in the direction of cobalt with increasing potential difference during their synthesis; the geometric parameters of nanotubes, in particular, the wall thickness, also vary. Using the X-ray diffraction analysis, it was found that an increase in the concentration of cobalt in the crystal structure of nanotubes leads to a decrease in the interplanar distance and an increase in the conductivity.     

Changes in structural and conducting characteristics of zinc nanotubes by bombardment with Xe<Superscript>+22</Superscript> heavy ions

Results of targeted modification of the structure and properties of ordered arrays of zinc nanotubes (Zn NTs) by accelerated Xe⁺²² heavy ions with a fluence of 1 × 10⁹ to 5 × 10¹¹ cm^–2 in the energy range of 1.0–1.75 MeV/nucleon are reported. Dynamics of changes in the crystallite shape and orientation of Zn NTs before and after irradiation has been studied by X-ray diffraction. It has been shown that irradiation with accelerated ions has a significant effect on the texture coefficients of Zn NTs. In addition, at a fluence of 1 × 10¹¹ m^–2 or higher, the formation of loose areas in the structure of Zn NTs as a result of partial degradation of the crystal structure and, consequently, a decline in conductivity are observed.     

Neutron yields upon irradiation of thick targets by ions with energies below 1.75 MeV/Nucleon

The yields of neutrons produced in thick LiF, Be, C, Al, Al₂O₃, and Cu targets irradiated by Li, C, and N ions with energies below 1.75 MeV/nucleon are measured on the DC-60 cyclotron at the Institute of Nuclear Physics, Astana Branch, Kazakhstan. The experimental angular distributions of the neutron yields from the targets are measured and an empirical equation to describe the distributions is proposed. The measured neutron yields are compared with the figures calculated by the LISE++ program. The measured and predicted neutron yields in the reactions coincide to within a factor of 2.     

Secondary fusion reactions in the bombardment of light-element targets with low-energy heavy ions

Neutron emission was observed experimentally at the DC-60 cyclotron at the Institute of Nuclear Physics (Astana, Kazakhstan). The neutron yields were measured in the bombardment of light-element (Be, C, Al, Al₂O₃, and LiF) targets with heavy ions (Ar, Kr, and Xe) with energies below the Coulomb barrier. The angular distributions of neutrons from the targets were also measured. It was found that the observed neutrons were produced in secondary nuclear reactions between the resting target nuclei and recoil nuclei that acquire energy in the process of elastic scattering. The experimental results were compared with calculations based on the abovementioned secondary-reaction mechanism. The calculations allow one to estimate the yields of secondary reactions to within a coefficient of 2.     

Immobilization of carborane derivatives on Ni/Fe nanotubes for BNCT

The most important limitation for boron neutron capture therapy of cancer is the selective accumulation of boron compounds in tumor tissues in significant quantities. In this paper, we describe the possibility to use magnetic Ni/Fe nanotubes as carriers for boron delivery. Carborane derivatives containing 10 and 21 boron atoms per molecule were immobilized on Ni/Fe nanotubes by covalent and ionic interactions. Magnetic properties of NTs were investigated by Mössbauer spectroscopy. Structure, element, chemical composition, and morphology of obtained magnetic nanotubes were studied by XRD, SEM-EDA, and FTIR spectroscopy. Results indicate success immobilization of carborane derivatives on Ni/Fe nanotubes and great potential to use them as carriers for boron neutron cancer therapy of cancer.

Open image in new window

Graphical abstract ?

     

Investigation of Modification of Zinc Nanotubes by Bombardment with Kr<Superscript>+14</Superscript> Ions

It has been found that irradiation with Kr⁺¹⁷ ion beam makes it possible to modify the crystal structure of Zn nanotubes and to perform electron annealing of defects, which leads to a change in the main parameters of the crystal structure.     

Luminescent Properties of Sapphire Single Crystals Irradiated with a Pulsed Fe10+ Ion Beam

Optics and Spectroscopy - The optical and luminescent properties of sapphire single crystals irradiated by a pulsed Fe10+ ion beam with an energy of 200 keV are studied. The results of measurements...     

Generation of color centers when annealing LiF crystals irradiated by Kr ions with an energy of 150 MeV

The effect thermal annealing has on F and F _n centers in LiF crystals irradiated by Kr ions with an energy of 150 MeV is studied with allowance for fluence and ionic currents. It is found that annealing at a temperature of 400 K using crystals irradiated at a fluence of ≥10¹³ iom/cm² reduces the concentration of F centers (due to annihilation with H centers) and raises the concentration of complex F _n centers.