Jyoti Prakash Dhal
National Institute of Technology Rourkela, Chemistry, Department Member
- Nanomaterials, Nanowires, Nanorods, Materials Science, Steel Structure, (i) Adsorption study: Removal of organic and inorganic pollutants by inexpensive adsorbents, and 9 morePhotocatalytic research of nanomaterials, Polymer Composites, Chemistry, Polymer Engineering, Nanotechnology, Materials Engineering, Composite Materials and Structures, Polymer Chemistry, and Nanoscienceedit
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Flake-shaped franklinite (ZnFe2O4) nanoparticles were successfully prepared by using the co-precipitation method. The phase and crystallinity of the synthesised franklinite nanoparticles were studied by X-ray diffraction. The scanning... more
Flake-shaped franklinite (ZnFe2O4) nanoparticles were successfully prepared by using the co-precipitation method. The phase and crystallinity of the synthesised franklinite nanoparticles were studied by X-ray diffraction. The scanning electron microscopy results revealed that the flake-shaped entities were formed in combination with rod-shaped nanomaterial. The band gap of the synthesised franklinite nanoparticles was found to be ∼2.14 eV by ultraviolet–visible diffuse reflectance spectroscopy measurements, indicating that this material absorbs visible light (λ max = 579.37 nm). The ferrite nanoparticles were successfully employed as a photocatalytic material for the degradation of the dye malachite green in an aqueous medium with ∼99% efficiency under visible light irradiation.
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α-Fe2O3 nanorod Jyoti Prakash Dhal, Braja Gopal Mishra and Garudadhwaj Hota* Department of Chemistry, National Institute of Technology Rourkela, India. Introduction One-dimensional nanostructure such as nanorods, nanotubes, nanowires... more
α-Fe2O3 nanorod Jyoti Prakash Dhal, Braja Gopal Mishra and Garudadhwaj Hota* Department of Chemistry, National Institute of Technology Rourkela, India. Introduction One-dimensional nanostructure such as nanorods, nanotubes, nanowires and nanofiber have attracted much interest due to their combination of superior properties like small dimension structure, high aspect ratio and unique device function that lead to a large range of promising applications in catalysis, adsorption, electronics, photonics, chemical sensors, field emission devices, solar cells, lithium ion battery, hydrogen storages and drug deliveries. α-Fe2O3 is a n-type semiconductor with band gap of 2.2 eV and hence it has been extensively used as a solar light photocatalyst. In the present work, we reported fabrication of rod like α-Fe2O3 by a facile soft chemical route for photocatalytic degradation of Malachite Green from aqueous solution under natural sun light.
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Research Interests: Chemical Engineering, Materials Science, Nanomaterials Characterization, Raman Spectroscopy, Nanocomposites, and 11 moreTransmission Electron Microscopy, Nanotechnology, Adsorption, Adsorption and wastewater treatment, Sorption, Nanorod, Chemical and Environmental Engineering, Hematite, Calcination, Scanning Electron Microscope, and Fourier transform infrared spectroscopy
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A novel low-cost polymer composite using brown grass flower broom reinforcement is prepared. From the physico-mechanical characterization, it is found that the prepared composite is lightweight and of high strength. Investigation of... more
A novel low-cost polymer composite using brown grass flower broom reinforcement is prepared. From the physico-mechanical characterization, it is found that the prepared composite is lightweight and of high strength. Investigation of dielectric behavior of this polymer composite proves its efficiency as a high-value marketable product. As the composite is made using bio-materials from local resources, its cost is less as compared to other polymer composites available today.
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A novel low cost polymer composite using brown grass flower broom reinforcement is prepared. The prepared polymer composite has the lowest porosity, homogeneous surface structure, and the greatest interface bonding. From the... more
A novel low cost polymer composite using brown grass flower broom reinforcement is prepared. The prepared polymer composite has the lowest porosity, homogeneous surface structure, and the greatest interface bonding. From the physico-mechanical characterization such as: hardness measurement, density measurement, void fraction or porosity measurement, and flexural strength measurement, it is found that the prepared composite is of light weight and high strength. Again, from dielectric behaviour of this polymer composite, it is found that this material has an efficiency that is considered as a high valued marketable product. As the composite is made using bio-materials from local resources, its cost is less compared to other polymer composites available today.
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The present piece of work describes the industrial wastes and low grade ores (fly ash + quartz + ilmenite, as the coating material), deposited on mild steel substrates. In many cases it is found that porosity is an important factor on the... more
The present piece of work describes the industrial wastes and low grade ores (fly ash + quartz + ilmenite, as the coating material), deposited on mild steel substrates. In many cases it is found that porosity is an important factor on the coating surface. Knowledge about the extent of these porosity imperfections is critical since they influence a wide range of spray coated properties and behaviors. To decrease the porosity by optimizing necessary operating parameters, artificial neural network (ANN) technique is used. The aim of this investigation is to find out appropriate input vectors in ANN model. ANN experimental results indicate that the projection network has good generalization capability to optimize the porosity.
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In recent years SS316LN microalloyed stainless steel is preferred for use as jacket material for Nb3Sn superconductor strands/wires. In the present investigation, microalloyed SS316LN is prepared in a vacuum induction melting furnace;... more
In recent years SS316LN microalloyed stainless steel is preferred for use as jacket material for Nb3Sn superconductor strands/wires. In the present investigation, microalloyed SS316LN is prepared in a vacuum induction melting furnace; Niobium and Molybdenum in their ferroalloy stage are considered as alloying element. This microalloyed steels are cast in water cooled copper mould. The tensile strength and elongation are measured and the fracture surface is studied under scanning electron microscope. It is observed that, there is a reduction of tensile strength and decrease in hardness of the steels prepared with addition of either/both the alloying elements; however there is an increase in ductility, which is helpful for cold rolling operation. From the micrographs it is observed that nitride precipitates are formed along the grain boundary, but formation of chromium carbide precipitates is reduced.
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This paper presents the work carried out for the improvement of mechanical properties of fly ash compacts by adding a binder. Here we added sodium silicate as a binder to the different weight fractions of fly ash, sand, gypsum and lime... more
This paper presents the work carried out for the improvement of mechanical properties of fly ash compacts by adding a binder. Here we added sodium silicate as a binder to the different weight fractions of fly ash, sand, gypsum and lime mixture and then compacted. These compacts were treated in normal water at different temperatures for seven days. Then compressive strength and microstructure for the different compacts were investigated. It was observed that the compressive strength of the fly ash compacts increased with addition of sodium silicate and the particles were dispersed and deviated from their globular equiaxed shape to multifaceted type in microstructure.
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This paper presents the work carried out for the improvement of mechanical properties of fly ash compacts by adding a binder. Here we added sodium silicate as a binder to the different weight fractions of fly ash, sand, gypsum and lime... more
This paper presents the work carried out for the improvement of mechanical properties of fly ash compacts by adding a binder. Here we added sodium silicate as a binder to the different weight fractions of fly ash, sand, gypsum and lime mixture and then compacted. These compacts were treated in normal water at different temperatures for seven days. Then compressive strength and microstructure for the different compacts were investigated. It was observed that the compressive strength of the fly ash compacts increased with addition of sodium silicate and the particles were dispersed and deviated from their globular equiaxed shape to multifaceted type in microstructure.
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Recent research focused on the applications of nanomaterials in environmental remediation especially the treatment of natural waters, industrial and domestic waste water and the polluted underground water. Providing clean water and a... more
Recent research focused on the applications of nanomaterials in environmental remediation especially the treatment of natural waters, industrial and domestic waste water and the polluted underground water. Providing clean water and a clean environment for the world growing population is a challenging task. The present thesis represents an extensive view of the use of nanomaterials in environmental remediation such as water purification using single and composite metal oxide nanomaterials by sorption and photocatalysis of toxic organic dyes. In the present study, we have synthesized 1D iron oxide nanomaterials and iron oxide based nanocomposites such as Fe2O3-SnO2, Fe2O3-CuO, Fe2O3/ZnFe2O4/ZnO, and MgFe2O4-Fe2O3 of different morphology using precipitation, hydrothermal and reflux methods. Apart from this we have also synthesized MgO nanomaterials and iron oxide impregnated mesoporous MCM-41 by wet chemical impregnation method. The obtained metal oxide nanomaterials and their nanocomp...
Iron oxide has various applications used in steel industry. In this work composites of graphene oxide and iron oxide have been prepared by horizontal dry planetary ball milling technique. Graphene oxide (1, 2 wt%) is reinforced to iron... more
Iron oxide has various applications used in steel industry. In this work composites of graphene oxide and iron oxide have been prepared by horizontal dry planetary ball milling technique. Graphene oxide (1, 2 wt%) is reinforced to iron oxide to develop composites with improved hardness. Compositions of iron oxide and graphene oxide were ball milled for 14 hrs followed by sintering. X-ray diffraction (XRD) analysis shows peaks of iron oxide and graphene oxide (GO). The agglomeration of phases were found in field emission scanning electron microscopy (FESEM) study. From microstructural analysis, graphene oxide is found to be randomly distributed in the grain of iron oxide. Micro hardness value of iron oxide and GO composite was found to increase significantly when 2% of GO is added to composite. The microstructure and hardness values of the composite of iron oxide-GO (2 wt%) can be considered as the suitable potential coating material for using on surface of conventional material like...
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Fe2O3/ZnFe2O4/ZnO nanocomposites exhibit enhanced photocatalytic activity due to the cascade electron transfer from ZnFe2O4 to ZnO to Fe2O3.
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Hematite (a-Fe2O3) and Fe2O3–SnO2composite nanorods were synthesized by a facile low cost wet chemical method followed by calcination at 500 C. The synthesized nanomaterials were characterized by X-ray... more
Hematite (a-Fe2O3) and Fe2O3–SnO2composite nanorods were synthesized by a facile low cost wet
chemical method followed by calcination at 500
C. The synthesized nanomaterials were characterized
by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy
(TEM), Fourier transform infrared (FTIR), and Raman spectroscopic techniques. XRD study showed the
presence of magnetic g-Fe2O3phase along with SnO2for Fe2O3–SnO2composite nanorods, calcined at
500
C temperature. However, in the absence of SnO2formation of pure a-Fe2O3phase was observed.
SEM and TEM results revealed the formation of uniform nanorods with typical diameter 100–200 nm.
The obtained a-Fe2O3and Fe2O3–SnO2composite nanorods were used as adsorbents for removal of
Congo red (CR) dye molecules from aqueous solution. The adsorption isotherms and kinetics were
studied. It was observed that, Fe2O3–SnO2(Fe:Sn = 8:2) composite nanorod showed highest percentage
adsorption with sorption capacity of 182 mg/g.
chemical method followed by calcination at 500
C. The synthesized nanomaterials were characterized
by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy
(TEM), Fourier transform infrared (FTIR), and Raman spectroscopic techniques. XRD study showed the
presence of magnetic g-Fe2O3phase along with SnO2for Fe2O3–SnO2composite nanorods, calcined at
500
C temperature. However, in the absence of SnO2formation of pure a-Fe2O3phase was observed.
SEM and TEM results revealed the formation of uniform nanorods with typical diameter 100–200 nm.
The obtained a-Fe2O3and Fe2O3–SnO2composite nanorods were used as adsorbents for removal of
Congo red (CR) dye molecules from aqueous solution. The adsorption isotherms and kinetics were
studied. It was observed that, Fe2O3–SnO2(Fe:Sn = 8:2) composite nanorod showed highest percentage
adsorption with sorption capacity of 182 mg/g.
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Austempererd ductile iron is the most recent development in the area of ductile iron. This is formed by an isothermal heat treatment of the ductile iron. The newly developed austempered ductile iron is now replacing steel in many fields... more
Austempererd ductile iron is the most recent development in the area of ductile iron. This is formed
by an isothermal heat treatment of the ductile iron. The newly developed austempered ductile iron is
now replacing steel in many fields so it has becoming very important to various aspects of this
material. In the present work the effect of copper along with the process variables (austempering
temperature and austempering time) on the properties (Tensile strength and Elongation) and
microstructure of ductile iron was studied. With increasing austempering time tensile strength and
elongation were increasing but with increasing austempering temperature tensile strength was
decreasing and elongation was increasing. Austempered ductile iron with copper was showing some
higher strength and lower elongation than the austempered ductile iron without copper. In
microstructure ferrite was increasing with increasing austempering time and austenite was increasing
with increasing austempering temperature in both the grades.
by an isothermal heat treatment of the ductile iron. The newly developed austempered ductile iron is
now replacing steel in many fields so it has becoming very important to various aspects of this
material. In the present work the effect of copper along with the process variables (austempering
temperature and austempering time) on the properties (Tensile strength and Elongation) and
microstructure of ductile iron was studied. With increasing austempering time tensile strength and
elongation were increasing but with increasing austempering temperature tensile strength was
decreasing and elongation was increasing. Austempered ductile iron with copper was showing some
higher strength and lower elongation than the austempered ductile iron without copper. In
microstructure ferrite was increasing with increasing austempering time and austenite was increasing
with increasing austempering temperature in both the grades.
In austempering, the microstructural end product of the spheroidal graphite (SG) iron matrix is essentially bainite, a structure formed below the pearlite temperature range but above the martensite range. Ductile cast iron undergoes a... more
In austempering, the microstructural end product of the spheroidal graphite
(SG) iron matrix is essentially bainite, a structure formed below the pearlite temperature
range but above the martensite range. Ductile cast iron undergoes a remarkable
transformation when subjected to the austempering process. Due to isothermal
transformation, it produces a microstructure that is stronger and tougher than the
structures resulting from conventional heat treatment process. In the present investigation,
the SG iron was austempered with three different austempering temperatures
(2500
C,3000
C and 3500
C) with varying austempering time. The sample was taken for
XRD analysis to study the morphology of the matrix. It was found that both the austenite
(111) and ferrite (110) lines are identified nearly in all cases. The maximum intensity of
the austenite (111) line is increasing with increasing temperature but ferrite (110) line is
increasing with increasing austempering time and decreasing with austempering
temoerature. Hence austempering calls for very precise control of process times and
temperatures.
(SG) iron matrix is essentially bainite, a structure formed below the pearlite temperature
range but above the martensite range. Ductile cast iron undergoes a remarkable
transformation when subjected to the austempering process. Due to isothermal
transformation, it produces a microstructure that is stronger and tougher than the
structures resulting from conventional heat treatment process. In the present investigation,
the SG iron was austempered with three different austempering temperatures
(2500
C,3000
C and 3500
C) with varying austempering time. The sample was taken for
XRD analysis to study the morphology of the matrix. It was found that both the austenite
(111) and ferrite (110) lines are identified nearly in all cases. The maximum intensity of
the austenite (111) line is increasing with increasing temperature but ferrite (110) line is
increasing with increasing austempering time and decreasing with austempering
temoerature. Hence austempering calls for very precise control of process times and
temperatures.