the magnetite (fe3o4) – agar nanocomposite was prepared by co-precipitation of fe (iii) and fe (ii) ions for the first time. the obtained samples were characterized by x-ray diffraction, fourier-transform infrared spectroscopy, scanning electron microscopy and transmission electron microscopy. ft-ir results confirm the formation of fe3o4 nanoparticles in agar matrix. the xrd results revealed th...

production of fe-c alloy powders by mechanical alloying was studied. fe and graphite elemental powdermixtures containing 0.8 and 1.5wt.% graphite were mechanically alloyed using a planetary ball mill. thestructural changes of powder particles during mechanical alloying were studied by x-ray diffractometery,scanning electron microscopy and microhardness measurements. for both compositions, mecha...

nano structured materials have wide range of applications due to their interesting size-dependent chemical and physical properties compared to particles of size in the range of micrometer. copper oxide nano materials are of interest on account of their potential uses in many technological fields. in this study  cuo nanoparticles were synthesized via simple sol gel method using basic cuso4 as we...

the main objective of this paper is to examine the effect of nanomaterials on mass transfer coefficient in bubble type absorption of carbon dioxide by experiment. the absorption process is carried out in a bubble column and in room temperature. mass transfer coefficient, saturated concentration of co2, and gas holdup are determined in this system. the kinds of nanomaterials, the concentrations ...

objective(s):   zinc oxide nanoparticles (znp) are increasingly used in sunscreens, biosensors, food additives and pigments. in this study the effects of znp on liver of rats was investigated.     materials and methods: experimental groups received 5, 50 and 300 mg/kg znp respectively for 14 days. control group received only distilled water. alt, ast and alp were considered as biomarkers to ind...

Over the past decade, a vast array of nanomaterials has been created through the development of nanotechnology. With the increasing application of these nanomaterials in various fields, such as foods, cosmetics, and medicines, there has been concern about their safety, that is, nanotoxicity. Therefore, there is an urgent need to collect information about the biological effects of nanomaterials ...

nanostructured ceo2 powders were synthesized via a series of hydrothermal and solution precipitation methods. three different hydrothermal methods including 1:2 and 1:1 bi:ce molar ratios at 180 °c for 48 h (s1 and s2, respectively) without calcinations and 2:1 bi:ce molar ratio at 180 °c for 48 h with calcinations (s3) were performed successfully for the synthesis of the target nanomaterials. ...

Introduction. Nanomaterials and Nanoproducts: World Markets and Human and Environmental Impacts . . . XXXIII Eric Gaffet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XXXIII 1 Nanotechnologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XXXIV 2 Nanomaterials . . . . . . . . . . . . . . . . . . . . . . . . . ...

Increased production and use of nanomaterials has led to an ever growing exposure of living organisms tothese substances. Limited knowledge about possible toxicity of nanomaterials and their potential to harmliving creatures is becoming a serious concern. To address this problem, there is a need for development ofdiagnostic methods enabling effective determination of potential toxicity of nanom...