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Journal of Nanotechnology & Advanced Materials



The Computer Program For The Study Of Nanoparticles in basis of SAOs

Arzuman G. Gasanov,
Abstract :
In this work we describe the possibility of using of the simple computer program developed in Delphi Studio working undo MS Windows OS for carrying out the quantum mechanical calculation of electronic structure of nanoparticles. There is described theoretical methodology for realization of this simple computer. The numerous quantum mechanical calculations show that this computer program works correctly and it is useful for use in basis of Slater Atomic Orbitals (SAOs).


Magnetic Hyperthermia with cobalt ferrite nanoparticles: the Influence of Particle Size

Abstract :
Magnetic nanoparticles possess unique properties which can be applied in nanomedicine, they address targets such as cellular therapy, tissue repair, nanobiosensors, drug delivery, magnetic resonance imaging and magnetic fluid hyperthermia. In this work, different sized cobalt ferrite nanoparticls (CFNP) were selectively synthesized with narrow size distribution, by using chemical precipitation methods, to aim for finding the optimum particle size which has high heating efficiency in the applied magnetic field. The obtained powder was calcined at different temperature (600 C, 800 C, 900 C, and 1000 C). The sample which characterized by Transmission Electron Microscopy (TEM) confirmed the formation of single-phase CFNP in the range 10115 nm depending on the annealing temperature. Localized magnetic particle hyperthermia treatment using ferrimagnetic nanoparticles continue to be an active area of medical research. So, homemade induction heater was designed. The heater was designed to be capable of generating high frequency, strong alternative magnetic fields (8 kAm1, 135 kHz). In vitro heating efficiencies in test tube, at a MNPs concentration of 250 mg CFNPml1, were measured in the applied field. The temperature increase (ΔT) of the tube content at 60 s was 29.9 C for MNPs of 18 nm, 26.7 C for 25 nm, 25 C for 60 nm and 22.9 C for MNPs of 95 nm. The smallest nanoparticles (18 nm) exhibiting a high heating efficiency. In conclusion, it was found that the size of the CFNP increased with increasing the calcined temperature at which the synthesis of the nanoparticles was performed. The heating efficiency of the particles was improved with decreasing particle size from 95 nm to 18 nm in the alternating magnetic field.


Effects of Ambient Temperature and Needle to Collector Distance on PVA Nanofibers Diameter Obtained From Electrospinning Technique

Akram R. Jabur,
Abstract :
Electrospinning can be considered recently as a leading technique for generating biomimetic scaffolds made of synthetic and natural polymers for tissue engineering applications. This technique was used in this research to produce bio-polymeric materials for fabricating engineered scaffold tissues by preparing (PVA) solution. Ambient temperature at (25, 30, 35, 40, 45 and 50 C) and needle tip to collector distance with (4, 8, 12, 15, 20 and 22 cm) were studied to optimize the shape and size (fibers diameter) of the electrospun fibers. The topography of individual electrospun fibers were studied by scanning electron microscopy (SEM). Measurements were done for each (SEM) images and lead to determine the mean diameters size of the obtained fibers. It was found that the average diameter of (PVA) fibers could be decrease to mean values (220500 nm) without creation of any beads, fibers diameter decreased as ambient temperature increase to certain temperature at (45 C) and retrain to increase at (50C) temperature, while increasing the needle tip to collector distance decrease the mean nanofiber diameter from (875 nm) at (4 cm) to (600 nm) at (22 cm).


Antibacterial Activity of Electrospun Silver Nitrate /Nylon 6 Polymeric Nanofiber Water Filtration Mats

Akram Raheem Jabur,
Abstract :
Bacterial contamination of water is a serious public health concern because it causes numerous diseases. Anti-microbial nanofibers can be synthesized by incorporating nanobiocides such as silver nanoparticles into nanofibers. Nylon 6 was dissolved in formic acid at a concentration of 25 wt % and durable antibacterial Ag AgNO3/Nylon nanofibers were prepared using electrospinning technique. Polymer solution were tested before achieving electrospinnin process to obtain its surface tension , electric conductivity and viscosity , all those parameters increase proportionally with increase amount of AgNO3 additions . SEM and EDX spectra were used to study the morphology, surface elemental composition, and fibers and porosize diameter of the nanofibers members. The resultants polymers were then tested for their ability to destroy bacteria in water; antimicrobial tests indicated that the prepared nanofibers have a high bactericidal effect. Accordingly, these results highlight the potential use of these nanofibrous mats as antimicrobial agents.


Thermal and Optical properties of Cadmium doped ZnO.

Abstract :
Cd-doped zinc oxide (ZnO:Cd) nanoparticles are synthesized by wet-chemical technique (co-precipitation method) at low temperature. The structural morphology, functional groups and thermal properties of product have been studied after sintering at 200C, 300C, 400C for 3hours. X-ray diffraction (XRD) is employed to confirm the material crystallinity, structure and particles sizes. The highest peak is obtained at 36.39. The range of particles size is 50 nm to 67 nm. Scanning Electron Microscopy (SEM) is used to investigate the surface morphology. SEM results show that the particles are in agglomerated. Fourier transformation infrared spectroscopy (FTIR) is used to detect the possible functional groups attached with prepared materials and change that occurred at mentioned temperatures. Phase transformation has been studied by DSC/TGA thermal analysis.


The microstructure and characterization of nickel ferrite nanofibers

Shaimaa J. Kareem,
Abstract :
The nanonickel-zinc ferrite (Ni1-xZnxFe2O4), with (x=0, 0.25, 0.5, 0.75), was prepared by electrospinning technique. Zinc nitratehexahydrate, nickel nitratehexahydrate, iron nitrate nonahydrate, PolyvinylpyrrolidonePVP and N, N-dimethylformamide (DMF) were used as precursor materials. Crystallization behavior of the precursor was studied by X-ray diffraction (XRD). Nanofibers phases can change from amorphous to spinel ferrite depending on the calcination temperature at (700 C) and crystallite size by Scherrers formula about (15.54-31.30)nm, while Morphological and structural properties were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman analysis microscopy tests.Finally, our results showed that the electrospinning method leads to obtain nanofibers of nickel zinc ferrite with good controllable stoichiometry at low temperature.


Effect of Inter-Electrode Distances of Glow Discharge On Structural and Optical Properties of ZnSe

E. R. Shaaban, F. Diab, G. M. El-Kashef, K. M. Ahmed, M. E. Abdel-kader, W. H. Gaber,
Abstract :
A glow discharge device is constructed and operated by using Ar gas. Paschen curve is analyzed at different pressures and inter-electrode distances. The experimental results show that the discharge is optimized at 5cm interelectrode distance. The I-V characteristic of the glow discharge at different pressures is studied. The Zinc selenide (ZnSe) thin film is treated by glow discharge. The effect of exposure to the Ar plasma immersion-ion-implantation at different inter-electrode spacing (5, 8.5, 11.5 and 14.5 cm) on the microstructure parameters and energy gap of ZnSe thin film are investigated. It is observed that, both crystallize size and lattice strains are increased by increasing the inter-electrode distances. The values of absorbance in strong absorption region are reduced with increasing the inter-electrode spacing. In addition, the optical band gap opt gE has been determined in terms of absorbance curves and found to be increased with the Paschens minimum, when inter-electrode spacing increases.



Pramod Kulkarni, Vasudeo Kulkarni,
Abstract :
Nickel nanoparticles has been synthesized using nickel chloride as a precursor and Coriander leaf extract as a reducing agent and stabilizing agent at room temperature under ordinary condition. The progress of the reaction was monitored most probably observing change in colour of obtained solution. The synthesized nickel nanoparticle was confirmed by UV-Vis, FTIR and powder XRD techniques. The size of nanoparticle was determined by using powder XRD and found to be 30.71 nm. The merits of this method are easily available material and inexpensive starting material, short reaction time, easy to carry out.


Effect of Zn Substitution on Structural and Magnetic Properties of Cobalt Ferrite Nanoparticles

Abstract :
Abstract: Zinc (Zn) substituted cobalt (Co) nanoferrites having stoichiometric composition Co1-xZnxFe2O4 with x ranging from 0.1 to 0.4 was prepared by chemical co precipitation method. All samples were synthesized at 90C and thereafter annealed at 900C temperature for about six hours. The crystalline structure, microstructure and magnetic properties of the samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). XRD confirms the single phase cubic spinal structure with particle size ranging from 30 to 35 nm. SEM confirms the smooth surface and uniform distribution of these particles.VSM results shows magnetic nature with decreasing saturation magnetization Ms with increasing of Zn content.


Solvothermal synthesis, characterization and optical properties of ZnO and ZnO-Al2O3 mixed oxide nanoparticles

Maryam Mahmoudi,
Abstract :
ZnO-Al2O3 mixed oxide nanoparticles were successfully produced from a solution containing Zn (acetate) and AlCl3 by Solvothermal method. The calcination process of the ZnO-Al2O3 composite nanoparticles brought forth polycrystalline two-phase ZnO-Al2O3 nanoparticles of 3050 nm in diameters. ZnO and Al2O3 were crystallized into wrtzite and rock salt structures, respectively. The optical properties of ZnO-Al2O3 nanoparticles were determined with solid state UV and florescent (PL). The structure properties of this sample were analyzed by XRD, SEM and Raman spectroscopy and then comparison with baulk case of these samples.


Solvothermal and Sonochemically Assisted Synthesis of ZnO Nanoparticles; Two Novel Direct Methods for preparation of ZnO Nanoparticles

ehsan zamani,
Abstract :
Nanoparticles of ZnO were prepared by a novel solvothrmal and sonochemical route from zinc acetate and sodium hydroxide without any requirement of calcinations steps at high temperature and without surfactants. Variations in several parameters and their effects on the structural (crystal size and morphology) properties of nanoparticles were investigated. Characterizations were carried out by X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM), Raman spectroscopy, solid state UV and solid state Florescent.

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