Digest Journal of Nanomaterials and Biostructures (DIG J NANOMATER BIOS )


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Publications in this journal

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    ABSTRACT: A novel green synthesis of nano-polymer porous gold oxide nanoparticles using CTAB surfactant with mixture of Olea europaea fruit and Acacia Nilotica extracts has been performed by applying sol-gel method. The techniques carried out to characterize the nanoporous particles: UV–visible spectroscopic analysis shows an absorption peak at 577.06 nm; which occurs due to Surface Plasmon Resonance (SPR), followed by Zitasizer for the average size of the nanoparticles which was 36 nm and has electrical conductivity about 6 mS/cm. In dry state, the sample measured using the Brunauer-Emmet-Teller (BET) Nitrogen gas adsorption method had a specific surface area of 146.706 m2/g. Transmission electron microscopy (TEM) and Scanning electron microscopy (SEM) images showed smooth cylindrical, spherical, and clustery shapes with porous surface morphology. EDS spectrum, linked with SEM, was used to analyze the elemental of gold oxide.
    Digest Journal of Nanomaterials and Biostructures 02/2015;
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    ABSTRACT: This paper investigates the mechanical behaviors of deformed carbon nanotubes including elastic, buckling and vibrational properties. The effects of stretching, twisting, bending and elliptic distortions are studied on the behaviors of the deformed carbon nanotubes. In both buckling and vibrational studies, two cantilever and doubly clamped boundary conditions are considered. The critical buckling loads and vibrational natural frequencies of the deformed carbon nanotubes and their corresponding mode shapes are presented in this paper. The well-known molecular mechanics approach is applied to model and investigate the mentioned properties.
    Digest Journal of Nanomaterials and Biostructures 12/2014;
  • Digest Journal of Nanomaterials and Biostructures 12/2014; 9(4):1713-1727.
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    ABSTRACT: The aim of this research was to prepare the inclusion complexes formed by hesperidin and (2-hydroxypropyl)-β-cyclodextrin by different techniques (kneading, co-evaporation and lyophilization methods), to carry out phase solubility studies, in vitro dissolution, antioxidant and antimicrobial tests. To confirm the inclusion compounds formation, spectroscopic (UV-Vis, FTIR, 1H-NMR) and thermal (DSC) methods were used. The obtained thermodynamic parameters proved that the inclusion process is spontaneous and is influenced both by temperature and cyclodextrin concentration. Moreover, for all obtained inclusion complexes the dissolution of hesperidin increased, the process being more effective for the lyophilization method in gastric pH 1.2 medium. Also, the inclusion complexes presented improved antimicrobial and antioxidant activities as compared to free hesperidin. The best antimicrobial activity was obtained against Candida albicans for the compound obtained by co-evaporation. The compound obtained through lyophilization showed an enhanced antioxidant activity according to the results obtained through two methods (DPPH free radical scavenging assay and lipoxygenase inhibition assay), while through the third technique (determination of the reducing capacity) the best results were obtained for the compound prepared by kneading. Thus, hydroxypropyl-β-cyclodextrin can be used to improve the biological properties of hesperidin.
    Digest Journal of Nanomaterials and Biostructures 12/2014; 9(4):1623-1637.
  • Digest Journal of Nanomaterials and Biostructures 10/2014; 9(4):1309-1315.
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    ABSTRACT: In this research, comparative study of corrosion resistance of aluminum based alloys and Al-alloys with nickel have been investigated. Several processes are conducted for the Al-Zn-Mg-Cu alloys and Al-Zn-Mg-Cu-0.5%Ni alloys were homogenized, aged then retrogressed and reaged; also, alloys were homogenized then the extruded thereafter heat treated. Al-Zn-Mg-Cu alloy and AlZn-Mg-Cu-Ni alloy samples after different treatments were subjected to corrosive media (acidic: 1.0M HCl) using weight loss method to evaluate their corrosion resistance. The consequences present that the precipitation for the base alloy samples treated led to enhance their resistance of corrosion. Furthermore, the gain of corrosion resistance for the Al-Zn-Mg-Cu-Ni alloy samples after the RRA treatment and thermomechanical with the RRA about of 52 and 75 %, respectively, more than what the Al-Zn-Mg-Cu alloy samples under same conditions. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were used to show the corroded surfaces.
    Digest Journal of Nanomaterials and Biostructures 10/2014; 9(4):1309-1315.