Wyniki wyszukiwania - BazTech

1

Biodegradowalne, przewodzące i elastyczne podłoża dla urządzeń opto-elektronicznych

Marzec Monika, Fryń Patryk, Lalik Sebastian, Bogdanowicz Krzysztof, Iwan Agnieszka

Przegląd Elektrotechniczny

|

2023

|

R. 99, nr 10

229--232

PL

Dokonano analizy porównawczej wpływu zawartości poszczególnych składników na wybrane właściwości warstw hybrydowych dwu- i trójskładnikowych na bazie trzech polimerów biodegradowalnych z domieszką jednościennych nanorurek węglowych (SWCN) i ciekłego kryształu 5CB. Pokazano, że najlepsze właściwości dla zastosowań w opto-elektronice jako biodegradowalna elektroda wykazuje kompozyt L,D-PLA:5CB:SWCN (10:1:0,5) o dużej elastyczności oraz dobrej stabilności termicznej.

EN

A comparative analysis of the impact of the content of individual components on selected properties of two- and three-component hybrid layers based on three biodegradable polymers with an admixture of single-walled carbon nanotubes (SWCN) and 5CB liquid crystal was carried out. The best one for applications in opto-electronics as a biodegradable electrode turned out to be the L,D-PLA:5CB:SWCN (10:1:0,5) composite with high flexibility and good thermal stability.

2

Vibration analysis of single-walled carbon nanotubes conveying nanoflow embedded in a viscoelastic medium using modified nonlocal beam model

Hosseini M., Sadeghi-Goughari M., Atashipour S. A., Eftekhari M.

Archives of Mechanics

|

2014

|

Vol. 66, nr 4

217--244

EN

In this study, the vibration and stability analysis of a single-walled carbon nanotube (SWCNT) coveying nanoflow embedded in biological soft tissue are performed. The effects of nano-size of both fluid flow and nanotube are considered, simultaneously. Nonlocal beam model is used to investigate flow-induced vibration of the SWCNT while the small-size effects on the flow field are formulated through a Knudsen number (Kn), as a discriminant parameter. Pursuant to the viscoelastic behavior of biological soft tissues, the SWCNT is assumed to be embedded in a Kelvin–Voigt foundation. Hamilton’s principle is applied to the energy expressions to obtain the higher-order governing differential equations of motion and the corresponding higher-order boundary conditions. The differential transformation method (DTM) is employed to solve the differential equations of motion. The effects of main parameters including Kn, nonlocal parameter and mechanical behaviors of the surrounding biological medium on the vibrational properties of the SWCNT are examined.

3

Using stability analysis of discrete elastic systems to study the buckling of nanostructures

Korobeynikov S. N., Alyokhin V. V., Annin B. D., Babichev A. V.

Archives of Mechanics

|

2012

|

Vol. 64, nr 4

367-404

EN

Stability/instability criteria of discrete elastic systems are used to study the buckling of nanostructures. The deformation of nanostructures is simulated by solving the nonlinear equations of molecular mechanics. The external forces applied to the nanostructure are assumed to be dead (that is the directions of their action remain constant throughout nanostructure deformation). We note that the positive-definiteness property of the tangential stiffness matrix of a nanostructure is a universal sufficient stability criterion for both equilibrium states and quasi-static/dynamic motions of the nanostructure. The equilibrium configurations are stable in Lyapunov's sense, and quasi-static/dynamic motions are stable in a finite time interval t "isin" (0, Tcr) in which the positive-definiteness property of this matrix is preserved. For dynamic motions of nanostructures, the stability property in this time interval follows from Lee’s criterion of quasi-bifurcation of solutions of second order ODEs. The non-positive definiteness of the tangential stiffness matrix of nanostructures at a time t > Tcr corresponds to both unstable equilibrium configurations and unstable dynamic motions. Computer procedures for determining the critical time and buckling mode(s) are developed using this criterion and are implemented in the PIONER FE code. This code is used to obtain new solutions for the deformation and buckling of twisted (10, 10) armchair and (10, 0) zigzag single-walled carbon nanotubes

4

Molecular dynamics of cholesterol in a thin film surrounding a carbon nanotube

Raczynski P., Dawid A., Sokół M., Grubski Z.

Materials Science Poland

|

2005

|

Vol. 23, No. 2

429--439

EN

Molecular dynamics ( MD) simulations of the system composed of a single walled carbon nanotube (SWNT) surrounded by a thin film of: a) cholesterol - water mixture and b) pure cholesterol have been carried out. The translational and rotational correlation functions and their Fourier transforms of both cholesterol and water molecules have been calculated for several temperatures and concentrations. The interpretation of translational and rotational dynamics of both cholesterol and water molecules in the specific environment is presented.