فهرست مطالب

Bio-Inorganic Hybrid Nanomaterials - Volume:6 Issue: 2, Summer 2017

International Journal Of Bio-Inorganic Hybrid Nanomaterials
Volume:6 Issue: 2, Summer 2017

  • تاریخ انتشار: 1396/08/01
  • تعداد عناوین: 8
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  • Seyed O. Mirabootalebi*, Gh. H. Akbari Pages 49-57
    Carbon nanotubes have different properties such as high strength and high Young's modulus, thermal and electrical conductivity, chemical reactivity and other unique physical, mechanical and chemical properties. With attention to these properties; they could have various applications in industrial, medicine and agriculture. Carbon nanotubes synthesis by variety methods and each of the mechanisms have precise features that can have specified properties of carbon nanotubes. Arc discharge, laser ablation and chemical vapor deposition are most common methods and Mechano-thermal, electrolysis and flame are others ways for synthesis carbon nanotubes. In this paper, synthesis of carbon nanotubes with common methods and other different methods were compared and discussed.
    Keywords: ARC Discharge, Carbon Nanotubes, CVD, Electrolysis, Flame Synthesis, Laser Ablation, Mechano Thermal, Synthesis methods of carbon nanotubes
  • Seyed A. Memerifard*, M. Rahimipour, I. Mobashrpour Pages 59-63
    Hard anodizing is a term that relates to the anodic coatings with high hardness and abrasion resistance. As has been pointed out in an article by researchers, these coatings are usually thicker than typical anodizing coating causes and in special circumstances to arise. The concentration of the oxide film layer in this process and therefore increases further. We also in the process electrolyte temperature are always kept low to reduce the rate of dissolution of the oxide film. In this project DC mode of Anodization used to study of voltage changes in different electrolyte consist of five types of organic additive.
    Keywords: DC mode, Hard-anodizing, Organic additive, Oxide layer, Voltage rate
  • N. Khalilzadeh Pages 65-70
    Introduction
    The basic features of nanophosphors specified by their structural state are propounded. New era in determination of absorbed dose is emphasized by using nanophosphor Lithium Tetraborate dosimeters.
    Objective
    They can be used for measuring absorbed dose of ionizing radiations more efficient than known micro-scaled materials in medical, personal and environmental dosimetry.
    Methodology
    Lithium carbonate reagent and boric acid were used as precursors. Poly vinyl pyrrolidone (PVP) was used as a capping agent to reduce the agglomeration of the particles. Besides, nitrate of copper (II) were used as dopants. Deionized water was used as the solvent. All materials which, utilized without any further purification, were purchased from Sigma Aldrich Company (United Kingdom) with purities more than 99.8% and used without further purification.
    Results And Discussion
    The effect of a high concentration of surface trapping centers and grain size of particles on the nanophosphor luminescence characteristics is noted. These features determine some effective Thermoluminescence properties, which are essential for radiation detection. The luminescence and dosimetric properties of nanophosphors of different compositions are described. It is noted that the consequence nanophosphors show promise results in linearity as an advanced material for detecting efficiently ionized radiation doses.
    Keywords: Absorbed dose, Detection, Dosimetry, Lithium tetraborate, Nanophosphor, Thermoluminescence, Thermal treatment
  • M. Mirzaie, A. Rashidi, H. Allah Tayebi*, M. E. Yazdanshenas Pages 71-77
    Removal of acid dyes from aqueous media has been effectively regarded and for this aim various methods have been tested. So in this study a new physical modification of mesoporous silica SBA-15 with PAMAM dendrimer as a new modifier and its application for the removal of Acid Red 266(AR266) from aqueous media has been verified. SBA-15, SBA-15-Cl and SBA-15-PAMAM were synthesized and then were characterized by FTIR.Also, the surface morphology of SBA-15 was recognized by transmission electron microscopy (TEM).Also, the effects of pH, adsorbent dosage, contact time, dye concentration and temperature as five important parameters for effective adsorption of acid dye were studied.Pseudo-first order and pseudo-second order kinetics models were analyzed to characterizing of adsorption rate. The calculated thermodynamic parameters represented the exothermic and spontaneous nature of the adsorption process. The results represented, SBA-15-Den can be applied as an affective Nano adsorbent for removal of acid dye from aqueous media.
    Keywords: Acid dye, Adsorption, Kinetic, Nano-adsorbent, Removal, SBA-15-PAMAM, Thermodynamic
  • S. Karim Dizani, R. Rasoolzadeh*, I. Rezazadeh Pages 79-84
    Cancer is described like a hocus pocus in our daily life, as growth, duplication and rarely unnatural proliferation of body cells. Free radicals are one of major factors that create cancer by oxidation. Nowadays, herbal materials are considered as one of anticancer drugs. This study is about anticancer properties of Beta carotene in carrot (Umbellifera Family) by Quantum Mechanic and Molecular Mechanic Calculation (QM/MM), NMR, Thermodynamic properties, vibration frequency, charge distribution and temperature effects are studied. It has the most negative Gibbs free energy. We can say that by increasing the molecule dipole moment, the interaction between molecules of solvent and solute will increase. Thus, interaction of solute molecules will decrease, which affects Gibbs free energy and entropy.
    Keywords: Anticancer, Beta Carotene, NMR, Quantum Mechanics, Thermodynamic
  • M. Golestaneh* Pages 85-87
    SiO2-TiO2 nanomposite materials have been synthesized by Sonochemical method from tetraethylorthotitanate and tetraethylorthosilicate. The synthesized products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectrum, electron dispersive X-ray spectroscopy (EDX) and ultraviolet–visible (UV–Vis). The results revealed that compared to SiO2 and TiO2, SiO2-TiO2 nanomposite materials display smaller crystal size, greater band gap energy. The photocatalytic activity of the synthesized products has been compared in the photodegradation activity of methylene orange (MO).
    Keywords: Methylene orange, Nanomposite, Photocatalytic, Photodegradation, Sonochemical, Water purification
  • B. Amini, M. Kamali, M. Salouti, P. Yaghmaei Pages 89-98
    Colorimetric DNA detection is preferable in comparison with the other methods used in clinical molecular diagnosis, because of no need to expensive equipment’s. In present study, the colorimetric method based on gold nanoparticles was used for the detection of P. aeruginosa. Firstly the primers and probe for P. aeruginosa exotoxin A gene were designed. Then, GNPs were synthesized using the citrate reduction method and conjugated with the prepared probe to develop the new nanobiosensor. Next, the extracted DNA of the bacteria was added to GNPs-probe complex to check its efficacy for P. aeruginosa diagnosis. When, GNP-probe-target DNA was cleaved into the small fragments by Bam HI endonuclease, the right shift of absorbance peak from 530 to 562 nm. It was measured using a UV-Vis spectroscopy that indicates the existence of P. aeruginosa. The sensitivity was determined in the presence of target DNA. The results obtained from the optimized conditions showed that the absorbance value has linear correlation with concentration of target DNA (R: 0.9850) in the range of 10-50 ng mL−1 with the limit detection of 9.899 ng mL−1. The specificity of the new method for detection of P. aeruginosa was shown in comparison with other bacteria.
    Keywords: Colorimetric assay, Endonuclease, Exotoxin A, Gold nanoparticles, Probe, Pseudomonas aeruginosa
  • H. Gheisari Dehsheikh*, E. Karamian Pages 99-104
    This project is engineering the properties of concrete containing natural nano zeolite as supplementary cementitious material in the blended Portland-cement based binder in amounts of 5, 7 and 10% by mass. Crashing of clinoptilolite zeolite is performed by means of planetary ball mill. Two types of concrete along with water to cementitious material ratio (W/(C P)) in 0.45 and 0.4 at the ages of 7, 28 and 90 days and were compared with each other. The effect of these additives on mechanical properties (compressive and tensile strength) and durability has been investigated by Electrical Resistivity (ER) and Rapid Chloride Penetration Test (RCPT) at the ages 28 and 90 days. Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) revealed that nano particles of natural clinoptilolite could improve quality of concrete. As a result of the tests, decrease in penetration of chloride ion and increase electrical resistivity significantly that are appropriate option for controlling of corrosion in reinforced concrete structures but increase of mechanical characteristics is not considerable.
    Keywords: Ball mill, Durability, Mechanical properties, Nano Zeolite, SEM, XRD