eng
Iranian Nanotechnology Society
International Journal of Nanoscience and Nanotechnology
1735-7004
2423-5911
2013-09-01
9
3
115
120
4007
Preparation of Hexanitrohexaazaisowurtzitane (HNIW) Nano Particle by Normal Microemulsion Based Nonionic Surfactant
Y. Bayat
1
M. Zarandi
2
Department of Chemistry and Chemical Engineering, Malek Ashtar University, Tehran, I. R. Iran
Department of Chemistry and Chemical Engineering, Malek Ashtar University, Tehran, I. R. Iran
The behavior of nanoscale energetic materials is quite different from micronsized energetic materials in many ways. Recently, some techniques such as sol-gel method, high speed air impaction and vacuum codeposition have been employed to obtain nanoscale energetic materials. However, only few attentions were paid to nanoscale energetic materials because of the fabrication difficulty. In this paper, the simple preparation of a nitramine 2,4,6,8,10,12 hexanitro 2,4,6,8,10,12 hexaazaiso wurtzitane (HNIW) with nanometer size by microemulsion method is presented. The microemulsion systems contained tween80, 2-propanol and n-butyl acetate as the oil phase. On the base of DLS measurement average particle size is 8 nm. The prepared nanoparticles are semispherical based on SEM picture.
https://www.ijnnonline.net/article_4007_d7519bcee91b60c3a7b4f9e92c88148b.pdf
Microemulsion
HNIW
Nanoparticle
surfactant
Nonionic
eng
Iranian Nanotechnology Society
International Journal of Nanoscience and Nanotechnology
1735-7004
2423-5911
2013-09-01
9
3
121
126
4008
A New and Efficient Method for the Adsorption and Separation of Arsenic Metal Ion from Mining Waste Waters of Zarshouran Gold Mine by Magnetic Solid-Phase Extraction with Modified Magnetic Nanoparticles
M. Moradian
1
M Moradian
2
Z. Boroumand
3
Applied Research Centre of Geological Survey of Iran, Tehran, I. R. Iran
Kashan University, Faculty of Chemistry, Department of Organic Chemistry, Kashan, I. R. Iran
Applied Research Centre of Geological Survey of Iran, Tehran, I. R. Iran
Widespread arsenic contamination of mining wastewater of Zarshouran (West Azerbaijan province) has led to a massive epidemic of arsenic poisoning in the whole of surrounding areas. It is estimated that approximately all agriculture fields are being irrigated with the water that its arsenic concentrations elevated above the World Health Organization’s standard of 10 parts per billion. A novel advanced magnetic matter adsorbent using magnetite embedded within nanosized Fe3O4 was prepared and applied for separation of arsenic metal ion from aqueous solution. This adsorbent combines the advantages of magnetic nanoparticles with magnetic separability and high affinity toward arsenic metal ions, which provides distinctive merits including easy preparation, high adsorption capacity, and easy isolation from sample solutions by the application of an external magnetic field. The adsorption behaviors of arsenic from an aqueous medium, using iron magnetite nanoparticles were studied by using equilibrium batch and column flow techniques. The effects of pH, contents of loaded magnetic matter nanoparticles, ionic strength, adsorbent dose, contact time, and temperature on adsorption capacity of the magnetic beads were investigated. All the results suggested that the mentioned nanoparticles could be excellent adsorbents for As(II) and As(III) contaminated water treatment.
https://www.ijnnonline.net/article_4008_4ad5f31d9e053bc82e80c7d77d4a3803.pdf
Advanced nano-magnetic matter
Adsorption
Arsenic removal
Magnetite nanoparticles
Zarshouran gold mine
eng
Iranian Nanotechnology Society
International Journal of Nanoscience and Nanotechnology
1735-7004
2423-5911
2013-09-01
9
3
127
138
4009
Investigating the Ibuprofen Chiral Forms Interactions with Single Wall Carbon Nanotube
N. Farhadian
1
Chemical Engineering Department, Engineering Faculty, Ferdowsi University of Mashhad, Mashhad, I. R. Iran.
The aim of this study is investigating the transport mechanism of ibuprofen chiral isomers inside single wall carbon nano tube (SWCNT) using mathematical modeling. To achieve this goal, molecular dynamics simulation has been performed to evaluate the interactions of ibuprofen isomers with SWCNT in an aqueous solution. Results show that both chiral forms of ibuprofen molecules enter and remain inside SWCNT from their methyl side chains and their movement is not along the centerline of the tube. The distance of the closest atom of the drug molecule from SWCNT surface is around 2.26A˚. A tilted angle between ibuprofen molecule and internal surface of SWCNT is detected to be around 34◦. Moreover, these ibuprofen chiral forms interact to each other from their carboxylic side chain. This causes ibuprofen fluctuation inside SWCNT around the tube axis. Also, calculated results do not show any significant differences between selectivity of SWCNT toward R- and S- chiral forms of ibuprofen molecule. This confirms that both ibuprofen chiral forms have the same transport mechanism inside SWCNT.
https://www.ijnnonline.net/article_4009_bd96d1a33007fab0e88d947c968f2518.pdf
carbon nano tube
Molecular Dynamics Simulation
chirality
Ibuprofen
Chiral forms
eng
Iranian Nanotechnology Society
International Journal of Nanoscience and Nanotechnology
1735-7004
2423-5911
2013-09-01
9
3
139
142
4010
Microwave–Assisted Hydrothermal Synthesis and Optical Characterization of SnO2 Nanoparticles
P. Boroojerdian
1
Department of Passive Defense, Malek Ashtar University of Technology, Tehran, I. R. Iran.
Semiconductor nanoparticles exhibit size dependent properties due to quantum confinement effect that are not present in their bulk counterparts. In this work, extremely fine and pure SnO2 nanoparticles of ~1.1 nm size were synthesized by a solution process, in which amorphous precipitate of SnO2 was crystallized by microwave heating. The particles sizes varied from ~1.1 to ~2.7 nm. By XRD analysis, the particle size, crystal structure and purity of the samples were determined. The UV-Vis measurements of SnO2 nanoparticles, showed that, excitonic peaks existed at ~237, ~250 and ~279 nm corresponding to ~1.1, ~2 and ~2.7 nm clusters respectively. The STM analysis showed that the nanoparticles were spherical in shape, having narrow size distribution.
https://www.ijnnonline.net/article_4010_3e42d36ef9fbbe6a88a96a613bc39c20.pdf
Tin Oxide
nanoparticles
Microwave heating
semiconductors
SnO2
eng
Iranian Nanotechnology Society
International Journal of Nanoscience and Nanotechnology
1735-7004
2423-5911
2013-09-01
9
3
145
150
4011
The Elemental Doping Effects on the Vibronic Properties of Nd: KTP Nanocrystallites
R. Malekfar
1
A. Cheraghi
2
G. Ahmadi
3
H. Nanakar
4
A. Mansori
5
A. Amerian
6
Physics Department, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, I. R. Iran
Physics Department, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, I. R. Iran Shahid Sattari University, Tehran, I. R. Iran
Physics Department, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, I. R. Iran
Shahid Sattari University, Tehran, I. R. Iran
Shahid Sattari University, Tehran, I. R. Iran
Shahid Sattari University, Tehran, I. R. Iran
In this work the synthesization process of nanocrstallite Nd:KTP powders by modified Pechini method was studied. The results of XRD studies indicate that KTP nanocrystallites doped by Nd has orthorhombic phase. The structural and lattice modes of the synthesized nanocrystallite products were investigated by using Micro Raman back scattering and FT-IR transmission spectroscopies. SEM imaging technique was applied for the observation of grain sizes and the morphology of the nanoparticles. The Debye-Scherrer formula was used to confirm the grain sizes determined by the SEM slides. In overall conclusion, it can be claimed that XRD, SEM and back scattering Raman spectroscopy are suitable methods to study the quality and characterization of nanocrystallite materials such as KTP family nanocrystals.
https://www.ijnnonline.net/article_4011_4b455f92eee9d782daedda446631171e.pdf
Nd-KTP
Nanocrysallite
Pechini method
Raman scattering
XRD
eng
Iranian Nanotechnology Society
International Journal of Nanoscience and Nanotechnology
1735-7004
2423-5911
2013-09-01
9
3
151
162
4012
Modeling and Optimization of Nano-bubble Generation Process Using Response Surface Methodology
R. Ahmadi
1
A. Khodadadi Darban
2
Mineral Processing Department, Faculty of Engineering, Tarbiat Modares University, Tehran, I. R. Iran
Civil- Environmental Engineering, Mineral Processing Department, Faculty of Engineering, Tarbiat Modares University, Tehran, I. R. Iran
In this paper, size distribution of nano-bubbles was measured by the reliable and fast method of laser diffraction technique. Nano-bubbles were produced using a nano-bubble generator designed and made based on hydrodynamic cavitation phenomenon in Venturi tubes. A Central Composite Design with Response Surface Methodology was used to conduct a five factor, five level factorial experimental design on the main process variables including frother concentration, solution temperature, pH, air flow rate and pressure drop in the cavitation tube nozzle. The statistical analysis used to develop a model for predicting the median size of nanobubbles (D50) showed that the frother concentration, solution temperature and air flow rate have the highest effect on the size of nanobubbles. Results demonstrated that with increasing the frother concentration and the air flow rate, the median nanobubble size (D50) decreased. The results also indicated that an addition of 20~ 40°C temperature, increased the median size of the nanobubbles formed in the solution. In the optimum condition, the frother concentration, solution temperature and air flow rate were found to be 69.5 mg/h-1, 20°C and 0.3 Lmin-1, respectively. In this study, the minimum median size of the nanobubbles produced in the laboratory and predicted by the prediction model was 130.75 and 129.83 nm,respectively, which showed that the model results properly fitted with experimental results.
https://www.ijnnonline.net/article_4012_f2576be4566b28d4a33684cae33b12a6.pdf
Nanobubbles
Hydrodynamic cavitation
Laser Diffraction Technique
Response surface
methodology