OAJ Materials and Devices

Development of a home-made experimental set-up for in situ coupling under vacuum of conductivity measurements, x-ray absorption and Raman Spectroscopies on bundles of single-walled carbon nanotubes intercalated with alkali metals

Fri, 17 Jun 2022 00:00:00 +0000

Here, we report the development of a homemade experimental setup to perform under vacuum an in situ study of the physical properties of bundles of single-walled carbon nanotubes intercalated with rubidium ions using electrical conductivity, X-ray absorption and Raman measurements. This set-up was successfully used at the SAMBA beamline at the Soleil synchrotron. The electrical resistance displays an important drop with the stoichiometry (intercalation time). The Raman radial breathing modes and the G-band of the nanotubes clearly indicate an important electron transfer. The G-band behaviour features a transition from semiconducting to metallic nanotubes, confirmed by the electrical resistance measurements as a function of the temperature after rubidium intercalation. This set-up can be used for the study of any type of extremely air sensitive materials.

Spectrophysics of Coumarin-Based Chromophore

Faisal Rasool; Amir Sohail — Sat, 09 Apr 2022 00:00:00 +0000

In this work, we comprehensively explore the spectral and photophysical properties of a coumarin-based dye (1) in neat solvents. The modulation of stokes shifts, emission quantum yields (?_F) and excited-state lifetimes of 1 by local environment (polarity, polarizability, viscosity and hydrogen bonding) signifies the formation of intramolecular charge state (ICT) from the amino group to the coumarin moiety. Collectively, in the more viscous polar solvents the rotation of the amino group is restricted, exponentially decreasing the non-radiative rate constants (k_n_r).

Mini review Applications of FRET-based supramolecular architectures for temperature sensing and Cancer diagnosis: A mini-review

Amir Sohail — Thu, 24 Feb 2022 00:00:00 +0000

Supramolecular nanostructured materials, displaying Förster resonance energy transfers (FRET) signals, have become the focus of interest for many researchers across the globe. FRET based supramolecular systems have extended applications in areas as diverse as materials science, biochemistry, analytical chemistry, and nanomedicine. The non-covalent phenomena operating in supramolecular frameworks depends on many factors such as wide range of time scales, binding strengths, distances, and concentrations of the supramolecular components (host and guest). Here in, we focus in which FRET has been used to study non-covalent interactions having a key role of cancer diagnosis and temperature sensing in supramolecular systems. Furthermore, we have discussed FRET-based architectures with current advancement in the field and provide a perspective on new advancement for the future.

Electrical capturing system for train supplying and involving parameters.

Yaovi GAGOU, PhD., Brice Jonckheere, Robert Bouzerar — Tue, 06 Dec 2022 00:00:00 +0000

Electric trains are powered by a current distribution device which depends on several parameters. This takes into account electrical energy production, its transportation and distribution. These cannot be assumed without energy loss. In the case of train navigation electric current can be transmitted by spots established between sources and the train. These spots represent a serious problem to be solved for good energy consumption since they depend on interface contact between pantograph and catenary. In these conditions it is worth to describe in the present paper all aspects governing the good functionality of energy production, its distribution and consumption to perform train activity.

Microstructure of zirconium carbide ceramics synthesized by spark plasma sintering

B.A.B. Alawad, H.A.A. Abdelbagi, Tshepo Ntsoane, Thulani Hlatshwayo — Mon, 23 May 2022 00:00:00 +0000

Zirconium carbide (ZrC) samples were prepared by spark plasma sintering (SPS), at temperatures of 1700 °C, 1900 °C and 2100 °C, all at pressure of 50 megapascal (MPa). The density of ZrC ceramic pellets was measured using a Micromeritics AccuPyc II 1340 Helium Pycnometer. The density of ZrC ceramic pellets was found to increase from (6.51 ± 0.032) g/cm³ to (6.66 ± 0.039) g/cm³and (6.70 ± 0.017) g/cm³when the temperature of the SPS was increased from 1700 ^oC to 1900 ^oC and 2100 ^oC respectively. Moreover, the hardness of ZrC ceramic pellets were measured using Rockwell hardness test. The hardness of ZrC ceramic pellets increased from (7.4 ± 0.83) to (17.0 ± 0.073) and (18.4± 0.05) gigapascals (GPa) at temperatures of 1700 ^oC, 1900 ^oC and 2100 ^oC respectively. X-ray diffraction shows the absence of spurious phases or impurity. XRD results showed that, all prepared ZrC samples has the same preferred orientation of the planes (i.e., 200). Furthermore, the average grain size of ZrC was calculated using Sherrers’s equation. The average grain size of the pure ZrC powder increased from 67.46 nm to 72 nm, 79 nm and 83 nm when the ZrC powder was sinteried at temperatures of 1700 ^oC, 1900 ^oC and 2100 ^oC respectively. The differences in the average grain size between the prepared samples leads to show different surface morphologies that monitored by scanning electron microscopy (SEM).

2022 - Updated template

Pierre Saint Gregoire — Fri, 08 Apr 2022 00:00:00 +0000

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