Nanomaterial Research Group

Tehrān, Iran

Nanomaterial Research Group

Tehrān, Iran
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Hidayat A.T.,Nanomaterial Research Group | Kusumaatmaja A.,Nanomaterial Research Group | Chotimah,Nanomaterial Research Group | Soekrisno R.,Gadjah Mada University | Triyana K.,Nanomaterial Research Group
AIP Conference Proceedings | Year: 2016

In this work, polyaniline was synthesized by conventional polymerization and rapid mixing polymerization method and confirmed by FTIR. Polyaniline nanofiber was successfully fabricated by electrospinning method in the presence of poly(vinyl alcohol) (PVA) due to the low solubility of polyaniline powder in the common solvents. Electrospinning solution was prepared in weight percent ratio 1:1 of PANI:PVA, and 11, 12 and 13% of PVA/total weight of a solution. The fibers obtained from spinning process then characterized by FTIR and SEM to determined their surface properties and morphology. In general, polyaniline resulted from conventional polymerization gave much larger diameter size of fibers and dispersed than from rapid mixing polymerization. The diameter of fibers was increasing accord with the increasing of polymer concentration. Fibers were decreasing in quantity and diameter due to PVA evaporation after being heated. © 2016 Author(s).

Nazari P.,Tarbiat Modares University | Yazdani A.,Tarbiat Modares University | Shadrokh Z.,Nanomaterial Research Group | Abdollahi Nejand B.,Nanomaterial Research Group | And 2 more authors.
Journal of Physics and Chemistry of Solids | Year: 2017

In this work, band gap engineering of quaternary chalcogenides with the general formula of Cu2FexSn(1-x)S4 was conducted by substituting Sn atoms with Fe atoms. The morphology and crystalline structure of the synthesized nanostructured powder were studied by field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD), respectively. Optical properties of the nanostructured powder were studied by UV–Vis spectroscopy. The results indicate that substitution of Sn atoms with Fe atoms could transfer the tetragonal structure of CTS to tetragonal CFTS structure. The 1.54 eV band gap reached in 80 at.% replacement of Sn atoms with Fe atoms resulting in a tetragonal Cu2FeSnS4 flower-like structure. Moreover, by loading smaller amount of Fe atoms up to 20 at.%, no Fe atoms incorporation in CTS structure was observed. © 2017 Elsevier Ltd

Sadjadi S.,University of Tehran | Eskandari M.,Nanomaterial Research Group
Ultrasonics Sonochemistry | Year: 2013

ZnO nanorods have been successfully used as an efficient, economic, and reusable catalyst for the synthesis of imidazo[1,2-a]azine under ultrasonic irradiation. This procedure offers advantages in terms of higher yields, short reaction times and mild reaction conditions. © 2012 Elsevier B.V. All rights reserved.

Eskandari M.,Nanomaterial Research Group | Haghighi N.,University of Tehran | Ahmadi V.,Tarbiat Modares University | Haghighi F.,Tarbiat Modares University | Mohammadi S.R.,Tarbiat Modares University
Physica B: Condensed Matter | Year: 2011

In this study, we have investigated the antifungal activity of ZnO nanorods prepared by the chemical solution method against Candida albicans. In the study, Zinc oxide nanorods have been deposited on glass substrates using the chemical solution method. The as-grown samples are characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). X-ray diffraction (XRD) showed zinc oxide nanorods grown in (0 0 2) orientation. The antifungal results indicated that ZnO nanorod arrays exhibit stable properties after two months and play an important role in the growth inhibitory of Candida albicans. © 2010 Elsevier B.V.All rights reserved.

Abdoli Yazdi N.,Islamic Azad University at Yazd | Arefi M.R.,Islamic Azad University | Mollaahmadi E.,Islamic Azad University | Abdollahi Nejand B.,Nanomaterial Research Group
Life Science Journal | Year: 2011

In this study, research has been done on the compressive and tensile strength of cement mortar containing Fe2O3 nanoparticles in the amounts of 1, 3 and 5 percent by weight of cement. The results show that the mechanical properties of samples containing 1 and 3 percent Fe2O3 nanoparticles are desirable than the ordinary cement mortar. SEM study about the micro structure of cement mortar containing nanoparticles and ordinary cement mortar showed that Fe2O3 nanoparticles fills the pores completely and reduces the large crystals of Ca(OH)2 and the hydrate products are denser and compact. The mechanical properties results showed that by increasing Fe2O3 nanoparticles to 5 percent reduces the mechanical properties.

Saadat M.,University of Tehran | Mohammadi S.R.,Tarbiat Modares University | Eskandari M.,Nanomaterial Research Group
Biosciences Biotechnology Research Asia | Year: 2013

In this study antimicrobial activity of ZnO nanoparticles and TiO 2 nanoparticles on the most common pathogen bacterium Pseudomonas aeruginosa was evaluated. P. aeruginosa is one of the prevalent pathogen that caused nosocomial infection. It is generally multi-drug resistant. Pseudomonas aeruginosa (ATCC 27853) were cultured on nutrient agar medium (NA) for 24h at 37°C. TiO2 and ZnO nanoparticles was synthesized from TiCl 4 and : Zinc acetate dehydrate after several steps, and the type and size of these particles were characterized by scanning electron microscopy (SEM) and X-Ray-: Diffraction (XRD). The microbial suspension with concentration of 1×106 cells/ml was prepared. Minimum Inhibitory Concentration (MIC) for TiO2 and ZnO was measured.This present study showed that synthesized ZnO and TiO2 nanoparticles can limit and prevent the growth of Pseudomonas aeruginosa.

Haghighi F.,Tarbiat Modares University | Mohammadi S.R.,Tarbiat Modares University | Mohammadi P.,Alzahra University | Eskandari M.,Nanomaterial Research Group | Hosseinkhani S.,Tarbiat Modares University
Bratislava Medical Journal | Year: 2012

Lots of Candida albicans infections involve in biofilm formation on medical devices. This kind of biofilm can impede antifungal therapy and complicates the treatment of infectious diseases particularly in field of chronic diseases associated with implanted devices. This study has investigated the influence of treating silicone catheter, PVC and glass coated with Titanium dioxide (TiO2) nanoparticles on attachment of C. albicans. In this study TiO2 nanoparticles were synthesized from precursor TiCl4 and characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) which showed TiO2 nanoparticles are 70-100 nm in size. In the simplest model of biofilms formation, C. albicans isolates (ATCC10231) and (ATCC 76615) were grown on the surface of small disks of catheter, PVC and glass in a flat-bottomed 12-well plates and evaluated biofilm formation using ATP bioluminescence and tetrazolium salt (XTT) reduction assays. In addition, morphology of C. albicans biofilms after 48 h incubation was observed by SEM. Results indicated that there is a statistical difference between mean of coated samples especially catheter and glass before and after TiO2 nanoparticles coating (p<0.05). In SEM analysis, C. albicans biofilm was more aggregated on the surface of glass and catheter than PVC and control groups and after treatment by these nanoparticles, catheter and glass both showed most significant decrease of C. albicans attachment in comparison to the control groups.

Ghanbari F.,Nanomaterial Research Group | Eskandari M.,Nanomaterial Research Group | Eskandari M.,Tarbiat Modares University | Nazari P.,Tarbiat Modares University | And 5 more authors.
RSC Advances | Year: 2016

Vertical ZnO nanorods were successfully grown on the crystalline surface of an Al2O3 microfilter by the simple technique of evaporation of prepared solution at atmospheric pressure (ESAP) for photocatalytic degradation of toluene. The nanorods were grown from evaporated solution at low temperatures of 300, 400, and 500 °C. The crystalline structure and morphology of the deposited films were evaluated by X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FE-SEM), respectively. The aqueous photocatalytic activity of the samples was measured by degradation of Methylene Blue (MB) dye. Toluene photodegradation was studied using a tubular photoreactor under various gas concentrations, flow rates (FR), relative humidities (RH), reaction temperatures (RT), and using various light sources. The grown ZnO nanorods were highly uniform and hexagonal wurtzite crystals with mono-sized nanorods. For the nanorods grown at 300 °C, the photocatalytic investigation showed approximately 98% degradation of MB for the first 20 minutes of UV light irradiation. The toluene degradation results indicated that alterations in gas concentration and flow rate affect the toluene degradation ability by direct and indirect oxidation and reduction mechanisms and the absorption capability of the ZnO nanorods' surface. In this system, 20% relative humidity and 30 °C reaction temperature were found to be the optimum conditions for maximum toluene conversion. © 2016 The Royal Society of Chemistry.

Harsojo,Nanomaterial Research Group | Harsojo,Gadjah Mada University | Susiani T.K.,Nanomaterial Research Group | Susiani T.K.,Gadjah Mada University | Sosiati H.,Nanomaterial Research Group
Advanced Materials Research | Year: 2014

A simple way of producing nano TiO2 on fiber polyvinyl alcohol (PVA) has been done by forming a mixture of anatase TiO2 micro powder in PVA and deionized water as a solution for electro spinner machine. The process relies upon the mixing of TiO2 and PVA in water before converted it into fiber. The result shows that before and after heat treatment at 300 °C, the eslectrospinning process are able to carry 60% TiO2 in the anatase phase in smaller fiber size showing a potential way of making fiber carrying nano crystalline anatase. © (2014) Trans Tech Publications, Switzerland.

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