Journal of Advances in Nanomaterials

8

Authors: E.Girgis, C. Tharwat, D. Adel

Ferrites nanostructures have been prepared with flower-like shape, as novel cost effective dye removal agent to be used in water purification. CoFe2O4, and MnFe2O4 has been prepared via ethylene glycol (EG) mediated self-assembly method. The morphological properties of the assynthesized nano-flower were investigated using transmission electron microscopy (TEM), and selected area electron diffraction (SEAD). Factors influenced shape of nano-flower, such as time, temperature, pH, and urea concentration has been studied. For water purification applications, it is clear that the as-prepared ferrites nano-flowers represent an excellent efficiency to remove polar red 390 dyes from water with efficiency with 46, and 96% for both of CoFe2O4, and MnFe2O4, respectively

9

Authors: Thales F.D. Fernandes and Bernardo R. A. Neves

This work explores an atomic force microscopy artifact that yields different topographic data depending on the scanning direction in contact mode. Such artifact is associated with differences in friction coefficients across the sample, which leads to up to 500% difference in topographic data of 2D materials. An analytical theory is used to explain quantitatively this artifact. Nevertheless, on the bright side, such artifact also yields a straightforward methodology, which effectively maps friction coefficients across any 2D material without the need of cantilever spring constant calibration.

10

Authors: Benoit Bideau, Eric Loranger , Claude Daneault

In this study, composite films based on TEMPO-oxidized cellulose nanofibers (TOCN), and polypyrrole (PPy) were synthesized by three different processes. The flexible composite films were investigated with scanning electron microscopy, thermogravimetric analysis, contact angle measurements, and finally, by mechanical and electrical testing. The developed composites have shown interesting mechanical properties (TOCN/PPy-3) as Young modulus (6.35 GPa) and tensile stress (65.6 MPa) or electrical conductivity (TOCN/PPy-1; 51.6 S/cm) for further applications such as flexible electrode. From proposed methods, the grafting of N-(3-aminopropyl)pyrrole was also interesting because it presented intermediate properties from all composites, and could represent a good compromise between the mechanical and electrical properties. Depending of their final application and by choosing an appropriate fabrication method, these composites could be considered in the design of high-performance electrodes for supercapacitor, battery, sensor or various packaging.