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Open Access Article
1 - Cr2O3 nanoparticles: Synthesis, characterization, optical, magnetic properties and photocatalytic degradation of methyl orange
Aliakbar Dehno Khalaji Pavel Machek Marketa JarosovaCr2O3 nanoparticles were synthesized via solid-state thermal decomposition of the mixture of Cr(NO3)3∙9H2O (as Cr precursor) and benzoic acid (as fuel) at 500 or 600 ºC for 3 h and characterized by FT IR and UV Vis spectroscopy, VSM, XRD and TEM. Also, characterize MoreCr2O3 nanoparticles were synthesized via solid-state thermal decomposition of the mixture of Cr(NO3)3∙9H2O (as Cr precursor) and benzoic acid (as fuel) at 500 or 600 ºC for 3 h and characterized by FT IR and UV Vis spectroscopy, VSM, XRD and TEM. Also, characterized using zeta potential PZ measurement. FT IR and XRD results confirm high degree of crystallinity of Cr2O3 nanoparticles with ≈ 16-18 nm average crystallite size. The size distribution of the as prepared Cr2O3 nanoparticles is estimated to be in the range of 10-60 nm using TEM images. The morphology of the as prepared Cr2O3 nanoparticles is almost ellipsoidal or pseudo spherical. In addition, the photocatalytic degradation of methyl orange (MO) under UV light was studied. The effects of pH solution, sorbent dose and irradiation time were investigated. Based on changes in the UV-Vis spectra of MO, photocatalytic efficiencies were calculated about 91% and 89% for CeO2 nanoparticles prepared at 500 or 600 ºC, respectively. Manuscript profile -
Open Access Article
2 - Fabrication of nano S646 bioactive glass and the effect of adding it to chitosan nanocomposites / carbon nanotubes for bone regeneration
Fateme Mirjalili Mahboobeh Mahmoodi Farniya MohammadifarNanoscale bioactive glasses have been gaining attention due to their superior osteoconductivity. The combination of bioactive glass nanoparticles with polymeric systems enables the production of nanocomposites with potential to be used in a series of orthopedic applicat MoreNanoscale bioactive glasses have been gaining attention due to their superior osteoconductivity. The combination of bioactive glass nanoparticles with polymeric systems enables the production of nanocomposites with potential to be used in a series of orthopedic applications, including tissue engineering and regenerative.This research has been done to study characteristic and biocompatible evaluation of a nano bio composite ceramic. In this regard synthesis of this S646 bioactive glass has been considered afterwards, the bioglass S646/chitosan/carbon nanotube with different amount of S646 bioactive glass has been synthesized by sol-gel method. The synthesized nanoparticles and nanocomposite have been characterized with the help of different techniques, using field emission scanning electron microscope, x-ray powder diffraction, fourier-transform infrared spectroscopy to evaluate crystal structure, microstructure and morphology. The results indicated that, the synthesized bioglass S646/chitosan/carbon nantube nanocomposite with the average particle size of about 41-49 nm and percentages of crystallinity about 64-86% for all samples. Result of FTIR analyses showed that, the purity in the structure of bioglass of S646 and nano composites.The outcomes revealed that, with increase of the amount of S646 bioactive glass changed the shape of the particles from spherical and reduced the particle size, which owing to the increase of amorphous phase in the material which reduced the crystallinity and crystal size of nanocomposite particles. The result of MTT assay indicated nontoxicity and also increasing the percentage of bioactive glass also increased cell viability. Manuscript profile -
Open Access Article
3 - Variable band-gap Sr-hexagonal ferrites on carboxylated graphene oxide composite as an efficient photocatalytic semiconductor
Masomeh Taghipour Mohammad Yousefi Reza Fazaeli Masoud Darvish GanjiIn this study, Sr Gdx Fe(12 –x) O19 nanostructures (x= 0, 0.2(3% Gd), 0.4 (6%Gd),0.6(9%Gd), 0.8 (12%Gd)) were synthesized by self-combustion sol-gel method and then calcined at the temperature of for 3 h. This compound was then composited with functionalized graph MoreIn this study, Sr Gdx Fe(12 –x) O19 nanostructures (x= 0, 0.2(3% Gd), 0.4 (6%Gd),0.6(9%Gd), 0.8 (12%Gd)) were synthesized by self-combustion sol-gel method and then calcined at the temperature of for 3 h. This compound was then composited with functionalized graphene oxide (GO) for the photocatalytic degradation of Enrofeloxacin. FESEM, EDS, XRD, and FTIR analysis were employed to investigate the particle size, elemental composition, morphological structure, functional groups determination and structural composition of the samples. VSM, BET-BJH, TGA-DTA, DRS and zeta potential analysis were also used to assess the magnetic properties, surface area, thermal stability, band-gap determination and suspension stability of the specimens, respectively. For evaluation of performance, photocatalytic degradation of Enrofeloxacin (an antibiotic that is widely used for domestic animals) is performed. The results showed that the 3% and 6% Gd-doped composites had the highest efficiencies in the photocatalytic reaction.This research reports the successful synthesis of SrGdxFe12-xO19/GO-COOH composites and its characterization by various techniques. The results indicated that SrGdxFe12-xO19/GO-COOH composite can be employed as an applicable candidate for the photodegradation of ENR antibiotic drug from pharmaceutical industry effluent as well as the water resources. Analysis of the results by statistical software based on the response surface method showed that the prolongation of the radiation time and catalyst mass, as well as pH reduction, can enhance the efficiency of ENR photodegradation. By increasing the pollutant concentration, however, the degradation efficiency declined. Manuscript profile -
Open Access Article
4 - A review of the treatment of bone tumours by hyperthermia using magnetic nanoparticles
Athena Ehsani Rayappa Shrinivas Mahale Shika Shayegan Ali Attaeyan Atefeh Ghorbani Shamanth Vasanth Sharath P C Sheyda Shahriari Azadeh AsefnejadCancer is a fatal disease that has long plagued and damaged people. In the last two decades, many researchers have been interested in the use of magnetic nanoparticles (MNPs) in medicine and pharmaceutical application particularly in the field of cancer diagnostics and MoreCancer is a fatal disease that has long plagued and damaged people. In the last two decades, many researchers have been interested in the use of magnetic nanoparticles (MNPs) in medicine and pharmaceutical application particularly in the field of cancer diagnostics and treatment. The goal of this article is to provide an overview of MNPs as well as the principles of successful techniques for delivering these nanoparticles to cancer cells. According to an examination, there are two types of active and passive techniques for delivering MNPs to cancer cells. The targeted transfer of nanoparticles to the tumour happens in the active approach, which uses specific molecular ligands of tumour cells and irradiates an external magnetic field to the tumour area, whereas the passive method penetrates the tumour due to its permeability and nanoparticle retention. MNPs offer a variety of applications in biomedicine, including targeted medication delivery to tumours, magnetic resonance imaging, and cancer treatment with hyperthermia, due to their magnetic nature and capacity to carry pharmaceuticals. The use of MNPs in medicine has led to focus on the treatment of cancer. This review indicates that a reduction in the side effects and biological damage produced by chemotherapy in patients can be obtained using MNPs. Manuscript profile -
Open Access Article
5 - Investigation of Parameters Effect on the Size and Morphology of Copper Nanoparticles using Various Reducing Agents
Maryam Mohammadpour Samad Sabbaghi Zahra ManafiCopper nanoparticles are widely used in various industries and products. Size and morphology are two important parameters to determine nanoparticle properties. In this study, copper nanoparticles were synthesized without an inert environment using two different reducing MoreCopper nanoparticles are widely used in various industries and products. Size and morphology are two important parameters to determine nanoparticle properties. In this study, copper nanoparticles were synthesized without an inert environment using two different reducing agents namely ascorbic acid and sodium hypophosphite. Various capping agents (PVP 105, PVP 4×104, PEG 6000, SDS, CTAB and glycerol) were used as stabilizers. Effect of several parameters including reducing agent concentration, type and amount of stabilizer and precursor concentration on the size and stability of the resulting nanoparticles have been investigated. The synthesis experiments resulted in a 25-60 nm average size of nanoparticles based on the synthesis conditions and the stabilizer type and concentration. Also this research provides a fast and simple way for the synthesis of stable pure colloidal copper nanoparticles in polyol, which is accomplished by decreasing CuSO4.5H2O using sodium hypophosphite in glycerol and without inert medium and homogeneous and non-agglomerated, 25 nm copper nanoparticles were obtained. The as synthesized copper nanoparticles are characterized using scanning and transmission electron microscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and dynamic light scattering techniques. Manuscript profile -
Open Access Article
6 - Poly Ethylene Glycol-Stearate polymer in the design of nano-drug delivery system for oral administration by curcumin
Marzihe Shahbazi Elham Rostami maryam kolahi alireza kiasatIn this work, Poly Ethylene Glycol- Stearate (PEG-SA) was used to prepare coated solid lipid nanoparticles (NPs) with loading curcumin extracted by Turmeric powder (cur-polymer coated-SLNs) by micro emulsification method. Evaluation of the release kinetic of prepared na MoreIn this work, Poly Ethylene Glycol- Stearate (PEG-SA) was used to prepare coated solid lipid nanoparticles (NPs) with loading curcumin extracted by Turmeric powder (cur-polymer coated-SLNs) by micro emulsification method. Evaluation of the release kinetic of prepared nanoparrticle was resulted. Particle size, zeta potential and polydispersity index were evaluated by Photon Correlation Spectroscopy (PCS). The particle size and zeta potential of cur PEG coated-SLNs had been measured as 153 nm. Differential scanning calorimetric indicated that the majority of curcumin loaded in PEG-NP was in amorphous state which is desirable for drug delivery. Drug entrapment efficiency (EE) was obtained 99%. The modification procedure led to a reduction in the zeta potential values, varying from -40.0 mV for the uncoated particles to -23 mV for that of (PEG-SA)-coated NP. FT-IR spectra and HPLC analysis of plain SLNs and pure curcumin exhibit no peak shifting and no loss of characteristic functional group peaks. Shape and surface morphology of particles were determined by transition electron microscopy and scanning electron microscopy that revealed spherical shape of nanoparticles. In vitro curcumin release of (PEG-SA)-coated SLNs and SLNs were showed the slight decrease performed for PEG-SA-SLNs one because of coating impact of covering layer. Manuscript profile -
Open Access Article
7 - How we can prepare Hydroxyapatite Nano Crystal from Egg-Shell?
Hassan GheisariIn this project we prepared Hydroxyapatite (HA) with chemical formula: Ca10 (PO4)6(OH) 2 from eggshell and di-potassium-phosphate with chemical formula; K2HPO4. Adequate amount of eggshell derived Calcium Oxide (CaO) was soaked in di-potassium phosphate solution (ratio: MoreIn this project we prepared Hydroxyapatite (HA) with chemical formula: Ca10 (PO4)6(OH) 2 from eggshell and di-potassium-phosphate with chemical formula; K2HPO4. Adequate amount of eggshell derived Calcium Oxide (CaO) was soaked in di-potassium phosphate solution (ratio: Ca/P=1.67) at 37 Celsius degree (˚C) for different soaking times to obtain nano-crystalline HA which was characterized by X-Ray Diffraction (XRD), Transition Electron Microscopy (TEM) and FTIR studies. The crystal grain size is very little dependent on the soaking time in di-potassium-phosphate solution and the grain sizes are almost uniform and regular in shape. The egg-shell derived HA nanoparticles could be used to make scaffolds of different shapes and pore sizes for clinical uses. This process of low temperature HA synthesis is simple, and environment friendly for the mass production of pure hydroxyapatite nano- crystalline. This process of low temperature HA synthesis is simple, and environment friendly for the mass production of pure hydroxyapatite nano- crystalline. Manuscript profile -
Open Access Article
8 - Construction nanoparticles imported into the environment in recent years in Iran
Zahra Sadid Mahsa FakharpourIn this paper, the quantities of nanomaterials used in the construction industry in Iran in recent years have been estimated. Then the amounts of nanomaterials in different environments of water, air, soil, and municipal wastewater from 2015 to 2019 in Iran have been es MoreIn this paper, the quantities of nanomaterials used in the construction industry in Iran in recent years have been estimated. Then the amounts of nanomaterials in different environments of water, air, soil, and municipal wastewater from 2015 to 2019 in Iran have been estimated. The results show that during these few years, the amount of imports of nanoparticles has been more than its production. This study shows that the highest concentrations of nanoparticles in different environments are SiO2, TiO2, Fe2O3, and carbon nanotube, respectively. While the concentration of TiO2 nanoparticles, carbon nanotubes, and Fe2O3 in different environments has increased with a gentle slope during five years. This could be due to the increasing use of these nanoparticles in the industry without control and the lack of appropriate filters to prevent nanoparticles from entering the environment. The results of this study show that during five years, the concentrations of SiO2, TiO2, carbon nanotube, Fe2O3 nanoparticles has increased by about 4%, 30%, 28%, and 45% in water and %11, 16%, 27% and 29% in air, respectively. Also, their concentrations in soil %23, 18%, 43% and 52% and in municipal wastewater %30, 27%, 37% and 61%, respectively. Manuscript profile
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