Abstracts
http://nur.nu.edu.kz:80/handle/123456789/3415
2024-03-29T07:12:10ZNew Composite Material for Both Biodegradable Electronics and Soft Biomedical Electronics
http://nur.nu.edu.kz:80/handle/123456789/5051
New Composite Material for Both Biodegradable Electronics and Soft Biomedical Electronics
Yedrissov, Azamat; Khrustalev, Dmitriy; Khrustaleva, Anastassiya; Vetrova, Anastassiya
The study of biodegradable polymers is in the focus of scientific interest, which is due to their increasingly diverse applications. Biodegradable polymers are widely used in the manufacture of packaging materials, cases for various products. In addition, they are used for various fields of medicine - from biodegradable prostheses to soft biomedical lectronics [1-3]. A new method for the production of Printed Circuit Boards (PCBs) based on polylactic acid and natural silk is proposed in this paper. The originality of our proposed method is to replace the currently used environmentally hazardous polymer binders with biodegradable polymers based on Polylactic acid and its
copolymers. Experimental data have shown that the obtained rigid laminate for the production of PCB has a number of practically useful characteristics: it is relatively resistant to environmental factors; has good properties: durability, lightness, low electrical conductivity, good adhesion to both hydrophilic and hydrophobic materials, can be made from renewable sources and can be completely recycled into lowmolecular-weight natural substances or reused. Also, the proposed material biodegrades into environmentally natural substances. This approach has great potential for practical industrial applications, especially in the light of the “green chemistry” and “circular economy” concepts. Besides, the described materials are a promising base for creating new composite materials for both biodegradable electronics and soft biomedical electronics.
2020-08-06T00:00:00ZQuantum-chemical simulation of N-doped Co3O4
http://nur.nu.edu.kz:80/handle/123456789/3510
Quantum-chemical simulation of N-doped Co3O4
Kaptagay, G.; Mastrikov, Yu.; Kotomin, E.; Sandibaeva, N.; Kopenbaeva, A.; Baitasheva, G.
Calculations were performed using the DFT method as implemented in the computer code
VASP 5.4[1]. Core electrons were substituted with the US potentials with the PAW method [2]. Exchange-correlation described by the PBE functional [3]. The Hubbard correction U-J=3eV [4] was applied to d-electrons of Cotet as well as Cooct atoms [5]. For defects modeling cubic 56-atom supercell model has been used. For Brillouine zone [6] was sampled with the 2x2x2 Monkhorst- Pack scheme.
2018-08-08T00:00:00ZInfluence of plasma exposure on physical characteristics of thin films of SnO2 obtained from SnCl4 solutions with additives of NH4F and NH4OH
http://nur.nu.edu.kz:80/handle/123456789/3509
Influence of plasma exposure on physical characteristics of thin films of SnO2 obtained from SnCl4 solutions with additives of NH4F and NH4OH
Mukhamedshina, D.M.; Fedosimova, A. I.; Dmitrieva, E.A.; Lebedev, I. A.; Grushevskaya, E. A.; Ibraimova, S.A.; Mit, K.A.; Serikkanov, A.S.
The electrical conductivity of tin dioxide is extremely sensitive to the state of the surface in the temperature range 300-800 K, at which oxidation-reduction reactions take place on its surface. Nanocrystalline films of tin dioxide are selectively sensitive to the presence of toxic gases, organic and certain biological molecules in the surrounding atmosphere [1]. SnO2-based films are also used as transparent conductive coatings [2]. To modify the properties of the films, alloying, heat treatment, plasma treatment is used.
2018-08-08T00:00:00ZDevelopment of double-layer anode material based on titanium nanotube for lithium batteries
http://nur.nu.edu.kz:80/handle/123456789/3508
Development of double-layer anode material based on titanium nanotube for lithium batteries
Ablayeva, K.; Abduakhytova, D; Lepikhin, M
Recently, considerable efforts of specialists in the field of power sources are aimed at research on fully 3D microbatteries. The key advantage of a 3D microbattery is the higher surface area as compared to a planar film that allows for increased contact area with the electrolyte and more surface sites available for reversible reactions with lithium ions. This in turn leads to improved battery kinetics and increased power density while maintaining a small areal footprint. This peculiarity of the battery design can be provided by the use of 3D structured cathode/anode materials, the most attractive of which are highly ordered nanotubes (NTs) made of titanium dioxide with high capacity at fast charge and discharge rates and excellent long-term cycling characteristics. Apart from this crucial result, key to the successful fabrication of a full solid state microbattery is the conformal deposition of electrolyte on the self-supported electrode material to preserve the 3D architecture.
2018-08-08T00:00:00ZFDTD simulations of transmission increase in corrugated tip of near-field scanning optical microscope
http://nur.nu.edu.kz:80/handle/123456789/3507
FDTD simulations of transmission increase in corrugated tip of near-field scanning optical microscope
Shomanov, Adai; Yessenbayev, Zhandos; Urazbaev, Arshat; Matkarimov, Bakhyt
This paper studies mechanisms of nano-focusing and transport of energy of a light through a tip with a sub-wavelength aperture diameter for scanning near-field optical microscopy (NSOM). In particular, we considered the problem of increasing the transmission of energy through the tip of the microscope. One way to improve transmission is to create a periodic metal-dielectric interface, which provides a coupling effect of the plasmon-polariton waves propagating at the boundary of the interface.
2018-08-08T00:00:00ZSynthesis of PVP-coated nanoparticles based on ferrum oxide
http://nur.nu.edu.kz:80/handle/123456789/3506
Synthesis of PVP-coated nanoparticles based on ferrum oxide
Yermekova, A.; Tulebayeva, D.
Magnetic nanoparticles, especial Fe3O4, are the most interesting particles among others because of their attractive properties and a wide range of application in various areas. But magnetic nanoparticles have huge surface energy and strong magnetic interactions between particles, which lead them to be more affected by uncontrollable aggregation in normal conditions of preparation. Stabilization could be achieved by electrostatic and steric repulsion. Particles coating by ionic compounds increase electrostatic repulsion, when two particles approach, that provide more effective stabilization.
2018-08-08T00:00:00Z