Effect of aluminum oxide nanoparticles additives and gamma irradiation on the structural and optical properties of syndiotactic polystyrene

2018 ◽  
Vol 59 (3) ◽  
pp. 555-565 ◽  
Author(s):  
M. A. Elhady ◽  
A. Abdeldaym
Keyword(s):  
Optical Properties ◽  
Aluminum Oxide ◽  
Gamma Irradiation ◽  
Syndiotactic Polystyrene ◽  
Oxide Nanoparticles ◽  
Structural And Optical Properties ◽  
Aluminum Oxide Nanoparticles

scholarly journals Effect of Aluminum Oxide Nanoparticles Films Thickness on Optical Properties

2018 ◽  
Vol 6 (11) ◽  
Author(s):  
I.H. Hilal ◽  
H. l. Abdullah ◽  
A. M. Ibraheem
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Aluminum Oxide ◽  
Band Gap Energy ◽  
Al2o3 Nanoparticles ◽  
Structural And Optical Properties ◽  
Aluminum Oxide Nanoparticles ◽  
Force Microscopy ◽  
Atomic Force ◽  
Different Thickness

The aluminum oxide (Al2O3) nanoparticles thin  films has been prepared via UV-irradiation methods using metal salts (aluminum nitrate Al(NO3)3) with different  thickness (150 , 200, 300 , and 400) and measuring structural and optical properties. The structure of the (Al2O3) nanoparticles thin films was tested with X-Ray showed that have six main diffraction features corresponding to (111), (311), (222), (400), (511) and (440) planes . The results of atomic force microscopy ( AFM )  indicated that all films have grain size about 25.97-65nm . The optical band gap energy was decreased by the increase of thickness from (5.19-4.68) eV then used aluminum oxide as gas sensor.

Slip velocity and temperature jump of a non-Newtonian nanofluid, aqueous solution of carboxy-methyl cellulose/aluminum oxide nanoparticles, through a microtube

2019 ◽  
Vol 29 (5) ◽  
pp. 1606-1628 ◽  
Author(s):  
Marjan Goodarzi ◽  
Saeed Javid ◽  
Ali Sajadifar ◽  
Mehdi Nojoomizadeh ◽  
Seyed Hossein Motaharipour ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Aqueous Solution ◽  
Aluminum Oxide ◽  
Temperature Jump ◽  
Methyl Cellulose ◽  
Oxide Nanoparticles ◽  
Carboxy Methyl Cellulose ◽  
Aluminum Oxide Nanoparticles ◽  
Content Type ◽  
Carboxy Methyl

Purpose With respect to two new subjects, i.e. nanofluids and microchannels, in heat transfer systems and modern techniques used for building them, this paper aims to study on effect of using aluminum oxide nanoparticles in non-Newtonian fluid of aqueous solution of carboxy-methyl cellulose in microtube and through application of different slip coefficients to achieve various qualities on surface of microtube. Design/methodology/approach Simultaneously, the effect of presence of nanoparticles and phenomenon of slip and temperature jump has been explored in non-Newtonian nanofluid in this essay. The assumption of homogeneity of nanofluid and fixed temperature of wall in microtube has been used in modeling processes. Findings The results have been presented as diagrams of velocity, temperature and Nusselt Number and the investigations have indicated that addition of nanoparticles to the base fluid and increase in microtube slip coefficient might improve rate of heat transfer in microtube. Originality/value The flow of non-Newtonian nanofluid of aqueous solution of carboxy methyl cellulose-aluminum oxide has been determined in a microtube for the first time.

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