Applying theMechanochemical Reaction of CationExchange
for Green Synthesis of an Organometallic Coordination
Polymer Nanofibers
Zh.
Moradi
School of Chemistry, College of Science, University of Tehran, Tehran
author
K.
Akhbari
School of Chemistry, College of Science, University of Tehran, Tehran
author
text
article
2019
per
Nanostructures of ZnBPDH2On 1, H2BPD 1,1´-biphenyl-2,2´-dicarboxylic acid supramolecular polymer were synthesized by the sonochemical process. The solid-state conversion of compound 1 nanostructures to nanofibers of Ag2BPDn 2 coordination polymer was investigated by cation exchange reaction of compound 1 with AgNO3. X-ray diffraction XRD analyzes and thermogravimetric and differential thermal analyses TG-DTA have shown that this conversion is irreversible. Consideration the crystal structure of these two compounds, which were reported previously, shows that during this process, the ZnO4 coordination sphere in 1 changed to AgO3Ag2˙˙˙C6 in 2, thus an organometallic compound was synthesized during this solid-state mechanochemical reaction.
Nanoscale
انجمن نانوفناوری ایران
2423-5628
6
v.
4
no.
2019
1
10
https://nanomeghyas.ir/article_46414_50b6ac6da030379cc4e2dba37dd3258e.pdf
Study of Chemical Activity and AdsorptionProperties of
Boron Nitride NanocagesInteraction with
Hydroxycarbamide Anticancer Drug by Density Functional
Theory Method
A.
Omid
Department of Chemistry, Faculty of Basic Sciences, Islamic Azad University, Khoy, Iran
author
R.
Esmkhani
Department of Chemistry, Faculty of Basic Sciences, Islamic Azad University, Khoy, Iran
author
text
article
2019
per
In recent years, great interest has emerged in the development of nanocarriers, especially boron nitride nanostructures for targeted drug delivery. In this research, electronic and adsorption properties of B12N12 and B30N20 nanocages interacted with hydroxycarbamideHC, as an anticancer drug are investigated by means of density functional theory DFT calculations at the B3LYP/6-31Gd level of theory. All of the computations were performed using the Gaussian 09 software. The adsorption energy Eads, formation energy, NMR and chemical activity parameters such as gap energy Egap, chemical hardness η, chemical potential µ, electrophilicity index ω, electron affinity EA and dipole moment were calculated to determine the best adsorption site for the anticancer molecule of hydroxycarbamide in boron nitride nanocages. The results showed that all complexes, especially Drug/B30N20 e complexe from the side of group –OH of drug molecule are stable in terms of energy and chemical activity. Finally, their interactions are a favorable process. As a consequence, boron nitride nanocages can be considered as a drug delivery vehicle for the transportation of hydroxycarbamide drug within the biological systems.
Nanoscale
انجمن نانوفناوری ایران
2423-5628
6
v.
4
no.
2019
11
21
https://nanomeghyas.ir/article_46416_929939dfeb09b7759dbd7ccf6decff8f.pdf
Pure spin and spin polarized currents in the benzene
molecule connected to three graphene leads
N.
Farshchi
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
author
M.
Esmaeilzadeh
Department of Physics, Iran University of Science and Technology, Tehran.
author
L.
Eslami
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
author
S. M
. Elahi
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
author
E.
Darabi
Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran.
author
text
article
2019
per
In this work, we present a theoretical study of a molecular junction based on benzene molecule at the center of the junction with three semi infinite graphene nanoribbons as external terminals to explore spin dependent current properties by using Green´s function method. The exchange magnetic field is exerted on the molecular junction in order to break the degeneracy of electrons with spin up and spin down states. It is shown that by changing chemical potential and choosing a proper geometry of the structure we can control the direction of spin dependent electron current such that in one of the external terminals electrons with different spin states flow in opposite directions; therefore, in that terminal the pure spin current can be attainable. In addition, we show that by considering another form of benzene Y-shape junction and by readjusting chemical potentials of the external terminals, we can set the system in a way that a totally unpolarized incoming spin current split into spin up and spin down currents which transmit through different output terminals. In this case, the proposed system can be considered as a Stern-Gerlach device.
Nanoscale
انجمن نانوفناوری ایران
2423-5628
6
v.
4
no.
2019
22
36
https://nanomeghyas.ir/article_46424_0b043a0593e5f1572aaba419adc1cea0.pdf
Biologicalsynthesis oftellurium nanoparticles by isolated
Brevibacillussp.strainTR2211 as biocatalyst
M
. Ashengroph
Department of Biological sciences, Faculty of Sciences, University of Kurdestan, Sanandaj
author
S.Z.
Mirzaei
Department of Biological sciences, Faculty of Sciences, University of Kurdestan, Sanandaj
author
text
article
2019
per
Tellurium nanoparticles have broad significant applications including treatment of infectious diseases, imaging, drug delivery systems, anti-inflammatory drug research, anti-inflammatory, anticoagulant drugs and treat many kinds of tumors. In the current study, potential of marine bacteria as biocatalysts were used for the biological reduction of tellurite oxyanion into to tellurium nanoparticles. The prepared tellurium nanoparticles were examined using UV-visible spectroscopy analysis, Energy dispersive x-ray spectroscopy EDS, Fourier-transform infrared spectroscopy FTIR and Scanning electron micrograph analysis. In this context, we isolated 13 tellurite-resistant bacteria were isolated using the enrichment technique. Among them, the strain TR2211 had a great potential for extracellular synthesis of tellurium nanoparticles. The isolated strain selected and characterized Brevibacillus sp. strain TR2211 GenBank accession number MK719235 based on phenotypic and molecular characteristics. Finally, the extracellular synthesis of tellurium nanoparticles was investigated under optimized reaction conditions. Our results show that the extracellular spherical-shaped tellurium nanoparticles with average size of 31 nm were formed in an optimal tellurite concentration of 1.5 mM, optimal initial biomass concentration 40 g/l at the optimal pH 7.5 and optimal temperature of 30ᵒ C after 120 h of incubation under resting cell conditions. This is the first report on biosynthesis of tellurium nanoparticles by Brevibacillus sp. strain TR2211.
Nanoscale
انجمن نانوفناوری ایران
2423-5628
6
v.
4
no.
2019
37
46
https://nanomeghyas.ir/article_46422_6b3a72f428acdfc59cae45569d782ad8.pdf
Design and Simulation ofPhotonic CrystalLensesin Various
Nano-Structures
Hamidreza
Tahmasbi
Department of Physics, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran.
author
Ahmadreza
Daraei
Department of Physics, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran.
author
text
article
2019
per
Owing to the requirements of integrated circuits to the structures that guide light in the requisite directions and focus on appropriate sites, benefiting photonic crystal properties to achieve photonic crystal lenses is proposed. These lenses have the high capability of focus for modes at the nano-scale focal point, with low loss. In this paper, photonic crystal lenses are designed through etching air-holes in a hexagonal arrangement in SiO2 dielectric substrate. By applying plane waves to these different nanometer structures with a variety of arrangements and pitches and interaction of light with structure, thereby light is focused at desired points. The results of the simulations, including electric field amplitude, intensity, power, and focusing width were investigated using field profiles at the wavelength of the first telecommunication window 850 nm. The simulation results indicated that these parameters can be applied at a specified and optimal pitch value, 385 nm, for optimum control and concentration in lensing at small nano-scale dimensions within a fraction of wavelength, ~0.49 µm. Also, the result of the Sensitivity for applying the structure as an optical sensor is 645 nm/RIU.
Nanoscale
انجمن نانوفناوری ایران
2423-5628
6
v.
4
no.
2019
47
53
https://nanomeghyas.ir/article_46415_52eb0c64ee77c5dc46276e71e6226248.pdf
Calculating ofthe Refractive index,the absorption and the
third order susceptibility coefficientsin the nematic liquid
crystal 5CBandZnS nanoparticles complex
Z.
Dehghani
Department of Physics, Faculty of Science, University of Neyshabur, Neyshabur
author
M.
Nadafan
Department of Physics, Faculty of Science, Shahid Rajaee Teacher Training University, Tehran
author
A.
Faraji Alamooti
Department of Physics, Faculty of Science, University of Neyshabur, Neyshabur
author
text
article
2019
per
In this research, third order nonlinear susceptibility of ZnS nanoparticles NPs in nematic liquid crystals NLCs have been recorded and analyzed. ZnS NPs have been synthesized by the hydrothermal method. Afterwards, the nonlinear refractive NLR index, linear refraction index , nonlinear absorption NLA coefficient, linear absorption coefficient and third order nonlinear susceptibility, of pure NLCs and ZnS NPs in NLCs were measured using the z-scan technique by using a continues wave CW He: Ne laser at 632.8 nm wavelength. The measurements were performed for homeotropic initial alignments of NLCs molecules. Strong optical nonlinearity, self-defocusing and two photon absorption TPA effects are observed for pure NLCs and ZnS NPs in NLCs by homeotropic alignments. according to given results, the NLR index and the NLA coefficient of the 5CB NLCs doped by ZnS NPs five and three times of the NLR and the NLA coefficient of pure NLCs, respectively.
Nanoscale
انجمن نانوفناوری ایران
2423-5628
6
v.
4
no.
2019
54
60
https://nanomeghyas.ir/article_46423_c4347d26aa7069e87d251fdfdb568d07.pdf
PhotoluminescenceEmissionProperties of Nanostructured
Co:CdZnSThin Films Prepared by ChemicalBath
DepositionMethod
R.
Sahraei
Department of Chemistry, Faculty of Science, Ilam University, Ilam
author
E.
Soheyli
Department of Physics, Faculty of Science, Ilam University, Ilam
author
Z.
Sharifirad
Department of Chemistry, Faculty of Science, Ilam University, Ilam
author
text
article
2019
per
In this study, it was tried to prepare nanostructured thin films of Co-doped CdZnS Co:CdZnS with relative single dopant-related emission peak, through optimization of several experimental parameters, and using chemical bath deposition technique. Results demonstrated that the intense emission peak around 530 nm can be attributed to the recombination of charge carriers through mid-gap localized energy levels of cobalt ions. The X-ray diffraction patterns of Co:CdZnS thin films, also revealed that increasing deposition temperature leads to an increase in the size of nanocrystals. The suitable quality of surface characteristics of the layer at each deposition temperature was demonstrated by field emission-scanning electron microscopy. The emission characteristics of these layers show their suitable applicable potentials as light-emitting structures in nanoscale optoelectronic devices.
Nanoscale
انجمن نانوفناوری ایران
2423-5628
6
v.
4
no.
2019
71
89
https://nanomeghyas.ir/article_46426_4bd4acf5a1bd79eaa59f47d62d17ed3f.pdf
Effect ofsulfur source concentration and deposition time on
structure, morphology and optical properties ofZnS
nanocrystalline thin films
A
. Darbeigi nameghi
Department of Polymer Engineering, Faculty of Engineering, Golestan University, Gorgan
author
A.
Goudarzi
Department of Polymer Engineering, Faculty of Engineering, Golestan University, Gorgan
author
text
article
2019
per
In this research, ZnS nanostructure thin films with thicknesses of 130-210 nm were prepared on glass substrates at 70 C by chemical bath deposition method. In this method, thioacetamide and triethylamine were used as a S-2 source and a completing agent instead of ammonia, respectively. The effect of changes in concentration ratio of thioacetamide to zinc as well as deposition time on structure, surface morphology, particle size, thickness and optical properties of the layers were examined by X-ray diffraction XRD, field emission scanning electron microscopy FE-SEM, atomic force microscopy AFM and ultraviolet-visible UV-vis. spectroscopy. UV-vis. spectroscopy data showed the prepared ZnS films to have more than 70 transmission in the visible region and an optical band gap ranging from 3.75 to 4.1 eV. XRD results revealed that the obtained films were highly crystalline with a cubic structure. FE-SEM images showed that the surface of the films was covered with homogenous, dense and fine spherical nanoparticles.
Nanoscale
انجمن نانوفناوری ایران
2423-5628
6
v.
4
no.
2019
81
90
https://nanomeghyas.ir/article_46425_78e06d9e0c56e12f4b6d5b2a675dd505.pdf
Effect ofsynthesis conditions and calcination on structural
properties ofTiO2 nanoparticles prepared by sol-gel method
N.
Memarian
Faculty of Physics, Semnan University, Semnan
author
M
. Mohammadi
Faculty of Physics, Semnan University, Semnan
author
A.
Neirameh
Department of Mathematics, Faculty of Science, Gonbad Kavous University, Gonbad
author
text
article
2019
per
In this paper nanoparticles of titanium dioxide have been synthesized by sol-gel method. Effect of sol aging time as well as calcination temperature on physical and structural properties of the nanoparticles have been studied by thermal analysis TG/DTA, x-ray diffraction XRD, transmission electron microscope TEM, and statistical analysis of particle size distribution. DTA thermal analysis of the sample shows three weight-loss regions. XRD analysis shows that samples have anatase phase up to 700 ºC, but at 800 ºC relative phase change to rutile can be seen and nanoparticles have mixed anatase and rutile phases. The samples calcined at 900 ºC have pure rutile phase. The results show that by increasing the calcination temperature the size of nanoparticles has increased and the largest crystallite size for anatase phase is obtained 38.7 nm and 147.5 nm for rutile phase. Furthermore, aging time has no effect on the crystalline phase of samples. FTIR spectra of the samples indicate the formation of Ti-O and O-Ti-O bonds. Absorption peaks which are related to symmetric and asymmetric CO bonds have been reduced after calcination and have been lost at higher temperatures. TEM image confirms the nanoparticles are spherical with 13.2 nm average diameter.
Nanoscale
انجمن نانوفناوری ایران
2423-5628
6
v.
4
no.
2019
102
109
https://nanomeghyas.ir/article_46412_b833ac484c22a691d0c0e579ae043395.pdf
The Investigation ofthe Half-metallic Properties of Mn-doped
SiC Monolayer for Nanospintronic Applications
M.
Rostami
Faculty of Physics, Kharazmi University, Tehran
author
M.
Afkani
Faculty of Physics, Kharazmi University, Tehran
author
M.
Abedi
Faculty of Physics, Kharazmi University, Tehran
author
P.
Aman Torkaman
Faculty of Physics, Kharazmi University, Tehran
author
text
article
2019
per
In this study, the structural, electronic and magnetic properties of silicon carbide monolayer coated with manganese have been investigated. The results of the electrical properties show that, in contrast to graphene, the pristine SiC monolayer has a sizeable band-gap which makes it suitable for application in electronics industry. The most stable structure was identified by considering manganese atoms on carbon atoms, silicon atoms, and hexagon centers with doing the complete relaxations of atomic positions and cell parameters. The results of the calculations show that the most stable state of this compound is related to the case when manganese atoms are deposited on carbon atoms. Therefore, the electronic and magnetic properties are calculated for this structure. The partial and total density of states indicate the existence of half-metallicity in this compound. As a result, this monolayer can be used to make Nano spintronic components and spin valves. Also, in this paper, we tried to study the mechanism for the formation of half-metallic by plotting spin-dependent band structure diagrams and comparing them with the partial density of states
Nanoscale
انجمن نانوفناوری ایران
2423-5628
6
v.
4
no.
2019
110
115
https://nanomeghyas.ir/article_46413_354759b676632bbf509ccb411a675aa6.pdf