Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Issue Info: 
  • Year: 

    2019
  • Volume: 

    9
  • Issue: 

    1
  • Pages: 

    1-9
Measures: 
  • Citations: 

    2
  • Views: 

    301
  • Downloads: 

    430
Abstract: 

Researchers use bionanotechnology techniques as eco-friendly and cost-effective routes to fabricate nanoparticles and nanomaterials. The present study confirms the ability of plant extract of Salvia spinosa grown under in vitro condition for the biosynthesis of silver nanoparticles (Ag NPs) for the first time. The surface plasmon resonance found at 450 nm confirmed the formation of Ag NPs. Moreover, FESEM images showed that nanoparticles had spherical morphology. Furthermore, XRD analysis confirmed the crystalline nature of the particles. FTIR analysis was carried out to identify possible biomolecules responsible in bioreduction of silver ions. Antimicrobial assay verified bactericidal activity of biosynthesized Ag NPs against Gram-positive and Gram-negative bacteria. According to the results, by growing the plants under controlled conditions, it is feasible to synthesize nanoparticles with desired properties.

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    9
  • Issue: 

    1
  • Pages: 

    11-18
Measures: 
  • Citations: 

    0
  • Views: 

    209
  • Downloads: 

    161
Abstract: 

In this research, the synthesis of a suitable nanocomposite in terms of properties and economics for use in bipolar plates in proton-exchange membrane fuel cells (PEMFCs) has been carried out successfully. Nowadays, bipolar plates play a significant role in fuel cells which is absolutely important in renewable energy industry. So, epoxy/graphite/nano-copper nanocomposite bipolar plates are prepared by bulk molding compound process. Graphite and nano-copper were added as primary and secondary fillers to the composite, respectively. Epoxy resin was selected since fabrication bulk molding can be done with ease and also because of its lower cost compared to other materials. Although graphite could increase conductive characteristics, it is not sufficient for bipolar plates. Therefore, we boost the conductive properties by increasing nano-copper. Due to the small size of nanoscale copper, it can be well dispersed in polymer and graphite matrix; nano-copper can release conductive properties perfectly throughout the composite. Different percentages of nano-copper, graphite and constant percentage of epoxy are used for this purpose. The electrical resistance, flexural strength, and density of composites were measured according to the applicable standards. The morphology of the prepared plate was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD) found that fillers disperse well in the matrix. Innovations in this work include improving properties and increasing the efficiency of the nanocomposite by adding metal nanoparticles (copper).

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    9
  • Issue: 

    1
  • Pages: 

    19-28
Measures: 
  • Citations: 

    0
  • Views: 

    208
  • Downloads: 

    173
Abstract: 

Sulfur compounds are one of the major problems and undesirable contaminants in the oil and gas industries. To address this issue, mercaptan removal from the gas stream in a fixed bed reactor under nanocatalyst was investigated. In this work, meso-tetrakis (4-carboxyphenyl) porphyrinatoiron (III) chloride-supported graphene oxide [GO-FeTCPP (Cl)] nanocatalyst was synthesized and adsorption of mercaptan on nanocatalyst was studied. Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), BET, and Raman spectroscopy analysis were used to characterize the nanocatalyst. This experiment investigated how temperature and Gas Hour Space Velocity (GHSV) parameters affect the mercaptan removal in presence of nanocatalyst. The research results confirmed that the reaction rate improves with increasing temperature and decreasing GHSV. According to the results, at 100 ° C and GHSV of 1000 h− 1, the maximum conversion (~ 96%) of reaction was reached.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    9
  • Issue: 

    1
  • Pages: 

    29-37
Measures: 
  • Citations: 

    0
  • Views: 

    161
  • Downloads: 

    99
Abstract: 

In the present study, lead titanate nano-sized powders were synthesized using citric acid gel method. The nanopowders were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Then, a nanocomposite system based on lead titanate nanopowders and carbon paste electrode (CPE) was designed and applied for determination of pentoxifylline (PTX). The prepared nanostructured electrode exhibited voltammetric responses with high sensitivity and selectivity for PTX and a detection limit of 2. 1 nM was achieved. Finally, the proposed method was used for analysis of PTX in environmental and biological samples with satisfactory results.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    9
  • Issue: 

    1
  • Pages: 

    39-51
Measures: 
  • Citations: 

    0
  • Views: 

    172
  • Downloads: 

    156
Abstract: 

In this study, quantum mechanical calculations, such as density functional theory (DFT), have been employed to determine the active positions of nanosensor and thermodynamics functions of interaction between Ag+ and nanosensor have been calculated. HOMO and LUMO energies and energy difference between donor atoms (i) and acceptor atoms (j) have been evaluated. In addition, the effect of the number of substitution agents on the reactivity of the functional carbon nanotubes and the charge on the interacting atoms and Ag+ before and after interaction have been investigated. The geometry optimization and theoretical calculations have been carried out using B3LYP level of theory. Results show that the interaction of Ag+ with nanosensor is in terms of thermodynamically possible. The negative values of Δ G° denote a spontaneous reaction and the negative values of Δ H° represent an exothermic reaction. In addition, the nanosensor has two active positions and the product obtained through the interaction between Ag+ and oxygen of the carbonyl group is the most stable state. The interaction of Ag+ with the nanosensor is accompanied by a reduction in the energy gap (Eg) which increases the stability of the complex, causes indicating that a charge transfer occurred between the nanosensor and Ag+.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    9
  • Issue: 

    1
  • Pages: 

    53-60
Measures: 
  • Citations: 

    0
  • Views: 

    213
  • Downloads: 

    158
Abstract: 

In the present work, we used doxycycline hyclate (DX) and tetramethylguanidine (TMG) for the synthesis of silver– silver chloride nanoparticles (DX-Ag– AgCl NPs) as a simple method for the production of nanoparticles (NPs). A new synthesis method for DX-Ag– AgCl NPs in aqueous medium, using the DX and TMG as a reducing and stabilizing agent, is reported. DX-Ag– AgCl NPs were characterized by transmission electron microscopy. The elemental composition and the crystalline nature of synthesized nanoparticles were determined by energy-dispersive X-ray (EDX) spectroscopy and X-ray diffraction (XRD) analysis, respectively. From EDX, it is confirmed that synthesized NPs contain elemental silver and chloride, and their crystalline nature was confirmed by XRD. The Fourier transform infra-red spectra showed the DX present in surface of DX-Ag– AgCl NPs. Synthesized NPs analyzed for antibacterial activity by agar well method against Gram-positive and Gram-negative pathogens. Synthesized DX-Ag– AgCl NPs were spherical shaped and in the range of 10– 40 nm of size was observed from TEM images. In the crystalline nature, XRD peaks indicate the presence of silver and silver chloride in produced NPs. Synthesized NPs show potential antibacterial activity on Bacillus cereus KCCM 11773, Bacillus subtilis KCCM 11316, Staphylococcus aureus KCCM 40050, Escherichia coli KCCM 11234, Klebsiella pneumoniae KCCM 11418, and Proteus vulgaris KCCM 40211.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    9
  • Issue: 

    1
  • Pages: 

    61-76
Measures: 
  • Citations: 

    0
  • Views: 

    181
  • Downloads: 

    125
Abstract: 

In the present work, we report an proficient, elegant, and rapid one-pot synthesis of variety of 3, 4-dihydropyrimidine-2(1H)-one/thione derivatives from β-dicarbonyl compounds, urea/thiourea, and various aromatic aldehydes using nano-La2O3 catalyst under ultrasonic irradiation. This novel synthetic strategy benefits with excellent yields, short reaction time, benign reaction conditions, clean transformation, and purification of products by non-chromatographic strategies. In addition, the synthesized nano-material was also explored as an effective gas sensor for NO2, LPG, methyl alcohol, and ammonia. The gas-sensing properties such as selectivity and sensitivity of selected gases along with response and recovery for nano-La2O3 sensor are reported in this paper. In this way, conferring nano-La2O3 is a multifunctional catalyst not only for organic synthesis but also for gas sensing. The synthesized La2O3 nano-material was characterized by Fourier transform IR, powder X-ray diffraction, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive spectroscopy, and Brunauer– Emmett– Teller isotherm. The formation of Biginelli adducts was confirmed by Fourier transform IR, 1HNMR, 13CNMR, DEPT-135 (distortionless enhancement by polarization transfer spectra), and mass spectral techniques.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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