Damyanti G Badagha; C D Modhera
Abstract
Now days, Nanotechnology is introduced in civil industry for ceramics, composites, and mortar to achieve better performance in different mechanical parameters of these materials. At the same time, Environment prevention is pin point for the civil industry because of cement production. As a solution of ...
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Now days, Nanotechnology is introduced in civil industry for ceramics, composites, and mortar to achieve better performance in different mechanical parameters of these materials. At the same time, Environment prevention is pin point for the civil industry because of cement production. As a solution of better performance of structural materials with environment prevention, steel making industry waste powder at Nano-scale giving better enhanced strength of mortar. This research work introducing the acceptable partial replacement of the steel waste powder in place of ordinary Portland cement to minimize environmental pollution due to cement production considering waste disposal solution. In the mortar making process, pure steel making waste used in powder form having compositions of SiO2, Al2O3, Fe2O3, CaO, MgO, SO3, Sulphide, Na2O3, K2O, Cl and MnO. Combined effect of these all compositions greatly affected on the mechanical properties of mortar containing this waste powder. To know the effect of this waste powder containing all these compositions in mortar, different mechanical parameters of mortar like compression, tension, flexural, shear and impact test were performed. For this innovative approach, steel making industry waste powder was examined to set consistency for mortar making purpose. To get optimum dosage of waste powder, 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, and 90% replacement were done in place of cement. Physical parameters like Compressive, Tensile and Flexural, Shear and Impact strength were examined using optimum dosage of waste powder. This innovative research work introduced the enhanced strength after 3 days, 7 days and 28 days curing. From this research work, it is advisable to use mortar containing waste powder in load bearing structures which is giving sustainable waste disposal solution including CO2 reduction in environment. Copyright © 2018 VBRI Press.
Ramakanth Illa; Jaroslav Hamrle; Jaromir Pištora
Abstract
Nanostructured thin films of MnFe2O4 were fabricated using chemical approach. Structural, magnetic, optical and magneto-optical properties of the films have been investigated using XRD, AFM, VSM, spectroscopic ellipsometry and MOKE spectroscopy. Structural evaluation of the thermally annealed films showed ...
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Nanostructured thin films of MnFe2O4 were fabricated using chemical approach. Structural, magnetic, optical and magneto-optical properties of the films have been investigated using XRD, AFM, VSM, spectroscopic ellipsometry and MOKE spectroscopy. Structural evaluation of the thermally annealed films showed crystalline phase and spinel structure along with appearance of textured nano-crystallites at the annealing temperature (Ta) of 500 °C and above. Surface morphology of the films annealed at 600 oC was characterized using AFM and the size of MnFe2O4 particles was observed to be 70 – 180 nm with ellipsoidal morphology and the surface roughness was found to be 8 nm. Hysteresis loops of the ferrite films indicated ferromagnetic behavior for annealing temperature of 400 oC and above, with a small contribution of paramagnetic nature arising from its oxide. The films showed a semiconducting behavior for the annealing temperature (Ta) ranging from 400 - 600 oC. The magneto-optical response is found to be small, i.e., one order less when compared to CoFe2O4 or metallic Fe, Co films. The maximum magneto-optical response from MnFe2O4 thin films is found for Ta = 400 oC, i.e. for incomplete spinel structure. As the material used for making the thin film coating is of the order of very few milligrams, these highly responsive films could be used as magnetic sensors. Copyright © 2017 VBRI Press.
Priyanka Goyal; Sudha Pal; Umesh Chandra Bind; Yogesh Kumar Sharma
Abstract
The present works gives the information about the structural and physical analysis of borosilicate glasses with praseodymium ions. Glass specimen were prepared with the chemical composition (50-x) B2O3 - (10+x) SiO2 – 10Na2O – 20PbO – 10ZnO - 1Pr6O11 (where x= 0, 5, 10, 15, 20, 25, ...
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The present works gives the information about the structural and physical analysis of borosilicate glasses with praseodymium ions. Glass specimen were prepared with the chemical composition (50-x) B2O3 - (10+x) SiO2 – 10Na2O – 20PbO – 10ZnO - 1Pr6O11 (where x= 0, 5, 10, 15, 20, 25, 30, 35, 40) by standard method. The composition of the glass specimens was finalized by EDX. The presence of various stretching and bending vibrations are confirmed with the help of FTIR analysis. The borate network of the present glass samples lies in the wavelength range 500-1600 cm-1 and confirmed by the TEM image. Anti-symmetric stretching vibrations with three non-bridging oxygens of B – O – B groups are present at ~1488 cm-1. XRD were recorded for confirmation of the amorphous nature of the samples. The SEM image confirmed the XRD results. Various physical parameters have been calculated for knowing the structure of present glass with increasing the SiO2 concentration. Oxygen Packing Density (OPD) decreases with increase in SiO2 concentration. Decrease in the value of OPD shows that glass structure is now loosely packed. Absorption spectra of the glass samples were recorded in UV-VIS/NIR region. JO intensity, Racah, Slater-Condon, Lande parameters have been computed. W2 parameter gives information about the glass structure and depends upon the Pr – O bond in the host matrix. Optical energy band gap and Urbach’s energy values were calculated for exploring the electronic band structure. Copyright © 2017 VBRI Press.
