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Materials and Devices     Open Access   (Followers: 1)
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Materials and Devices
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2495-3911
Published by Collaborating Academics Homepage  [1 journal]
  • 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

    • Authors: Laurent Alvarez, Yann Almadori, Eric Alibert, Jérôme Barbat, Rémi Jélinek, Guillaume Prévot, Raymond Aznar, Ahmed Zahab, Valérie Briois, Jean-Louis Bantignies
      Abstract: 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.
      PubDate: 2022-06-17
      Issue No: Vol. 6, No. 1 (2022)
       
  • Microstructure of zirconium carbide ceramics synthesized by spark plasma
           sintering

    • Authors: Bilal Abass Bilal Alawad, Hesham Abdelbagi Ali Abdelbagi, Tshepo Ntsoane, Thulani Hlatshwayo
      Abstract: 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/cm3 and (6.70 ± 0.017) g/cm3 when 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).
      PubDate: 2022-05-23
      Issue No: Vol. 6, No. 1 (2022)
       
  • Spectrophysics of Coumarin-Based Chromophore

    • Authors: Faisal Rasool, Amir Sohail
      Abstract: 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 (knr).
      PubDate: 2022-04-09
      Issue No: Vol. 6, No. 1 (2022)
       
  • 2022 - Updated template

    • Authors: Pierre Saint Gregoire
      Abstract: This is the updated template to be used to submit the final version of your article submitted to the OAJ Materials and Devices. "Review" and "Methods" articles are based on different templates. When submitting, please fill all details asked in the different steps, it is in particular necessary to enter all authors, and article metadata (list of references, disciplines, fields, keywords, etc). Submissions with incomplete data will be rejected.
      PubDate: 2022-04-08
      Issue No: Vol. 6, No. 1 (2022)
       
  • Mini review Applications of FRET-based supramolecular architectures for
           temperature sensing and Cancer diagnosis: A mini-review

    • Authors: Amir Sohail
      Abstract: 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.
      PubDate: 2022-02-24
      Issue No: Vol. 6, No. 1 (2022)
       
 
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