Synthesis of Diopside by Solution Combustion Process Using Glycine Fuel

Sherikar, Baburao N.; Umarji, A.M.

doi:10.1142/s2010194513010155

Cited by 12 publications

(7 citation statements)

References 5 publications

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“…During synthesis of V 2 O 5 by SCS, though the ignition temperature is maintained at 500 °C, it is reported that at the microscopic scale the temperature can be as high as 1500 °C. This is achieved at an optimum equivalence ratio of fuel (F, urea) and oxidizer (O, metal nitrate) (defined as oxidizer to fuel ratio; O/F) of unity [41,42]. Due to this effect, the crystallites are well formed, leading to sharp peaks in the XRD pattern.…”

Section: Structural Characterizationmentioning

confidence: 99%

Scandium: An efficient dopant to modulate the optical spectrum of vanadium dioxide (VO2)

Bhardwaj

Umarji

2020

SN Appl. Sci.

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Transparency of VO 2 thin films in the visible region is an important aspect of study for its use in smart window applications. In this regard, we experimentally validate the theoretical prediction regarding the influence of scandium (Sc) doping on modulating the optical spectrum of VO 2. Sc-doped nano-crystalline VO 2 , bulk and thin films were synthesised using a two-step process involving a rapid non-equilibrium solution combustion process and ultrasonic nebulised spray pyrolysis of aqueous combustion mixture respectively; followed by a reduction step. The presence of Sc was determined by X-ray photoelectron spectroscopy where a peak observed at 530.06 eV is attributed to Sc-O interaction. Raman spectra showed a shift in 611 cm −1 peak position to a lower wavenumber due to tensile strain arising from Sc doping. Sc-doped VO 2 thin films showed semiconductor to metal transition of four orders of magnitude change in resistance. Sc-doping increased the band gap from 1.76 eV for undoped to 2.02 eV with 2.0 at. % of doping thereby making the films more transparent in the visible region of the optical spectrum. This shift in the band gap of VO 2 was consistent with the theoretical reports. Thus, Sc is a potential dopant for modulating the optical spectrum of VO 2 for its application in smart windows.

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Section: Structural Characterizationmentioning

confidence: 99%

Scandium: An efficient dopant to modulate the optical spectrum of vanadium dioxide (VO2)

Bhardwaj

Umarji

2020

SN Appl. Sci.

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“…SCS is a fast process and it is completed in a few seconds, hence the process can be assumed as adiabatic. Using the thermodynamic data for the reactants and products (Table ), the enthalpy of combustion and the theoretical adiabatic combustion temperatures were calculated by the Equations and :

Δ H_{comb .}^{\circ} = {(][\sum n {normalΔ}_{f}^{\circ})}_{normalproducts} - {(][\sum n {normalΔ}_{f}^{\circ})}_{normalreactants}

Q = - Δ H = \int_{T_{0}}^{T_{italicad}} false(\sum n C p false) d T

…”

Section: Resultsmentioning

confidence: 99%

“…where ∆ H is the enthalpy of combustion, C p is the heat capacity of products at constant pressure. For simplification in the calculation of exothermic heat, the reaction temperature ( T 0 ) has been assumed to be 623 K, which is approximately the decomposition temperature of urea and T f is the adiabatic combustion temperature …”

Section: Resultsmentioning

confidence: 99%

Combustion synthesis and characterization of Sr₃Al₂O₆

Barbosa¹,

Nascimento²,

Carrodeguas³

et al. 2018

Int J Applied Ceramic Tech

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In this paper, the synthesis by solution combustion (SCS) of tri-strontium aluminates (Sr 3 Al 2 O 6 ), using different fuel amounts, has been studied. The main objective was to understand the effect of the amount of fuel on phase formation, yield and purity of the product using urea as fuel. The combustion temperatures of each reaction were followed by digital pyrometry. Phase compositions were determined by X-ray diffraction (XRD). The microstructural characteristics during the SCS process were studied by field emission scanning electron microscopy (FESEM).The specific surface area was calculated with the BET model from adsorption data. The results showed that the Sr 3 Al 2 O 6 was the main phase obtained in all syntheses. This aluminate with high content of Sr is considered attractive for use in applications requiring radiopacity as biomaterials for dental and bone repair. The maximum measured temperature during synthesis, with excess fuel, was approximately 987°C. It was higher than that obtained in the case of using stoichiometric amounts of fuel which was 762°C. The product obtained in this second case had a submicrometer structure, with highly crystalline particles and a specific surface of 0.21 m 2 /g. It was higher than that obtained with excess of fuel (0.07 m 2 /g).

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“…Sol–gel assisted ball milling method was followed to prepare diopside at 1200°C (Najafinezhad et al, ). On the other hand, solution combustion synthesis was employed to obtain pure diopside at 800°C by using glycine and ammonium nitrate as fuel and oxidizer, respectively (Sherikar & Umarji, ).…”

Section: Significance Of Synthesis Techniquesmentioning

confidence: 99%

Review on calcium‐ and magnesium‐based silicates for bone tissue engineering applications

Venkatraman

Swamiappan

2020

J Biomedical Materials Res

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Bone is a self-engineered structural component of the human body with multifaceted mechanical strength, which provides indomitable support to the effective functioning of the human body. It is indispensable to find a suitable biomaterial for substituting the bone as the bone substitute material requirement is very high due to the rate of bone fracture and infection lead to osteoporosis in human beings increases rapidly. It is not an easy task to design a material with good apatite deposition ability, a faster rate of dissolution, superior resorbability, high mechanical strength, and significant bactericidal activity. Since the synthetic hydroxyapatite was not able to achieve the dahlite phase of hydroxyapatite (natural bone mineral phase), silicates emerged as an alternate biomaterial to meet the need for bone graft substitutes. All silicates do not exhibit the properties required for bone graft substitutes, as their composition and methodology adopted for the synthesis are different. Calcium, magnesium, and silicon play a major role in the formation of bone mineral and their metabolism during bone formation. In this review, the relationship between composition and activity of calcium, magnesium-based silicates have been discussed along with the future scope of these materials for hard tissue engineering applications. K E Y W O R D Sapatite, calcium, magnesium, mechanical strength, osteoporosis, silicates

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Synthesis of Diopside by Solution Combustion Process Using Glycine Fuel

Cited by 12 publications

References 5 publications

Scandium: An efficient dopant to modulate the optical spectrum of vanadium dioxide (VO2)

Scandium: An efficient dopant to modulate the optical spectrum of vanadium dioxide (VO2)

Combustion synthesis and characterization of Sr₃Al₂O₆

Review on calcium‐ and magnesium‐based silicates for bone tissue engineering applications

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Synthesis of Diopside by Solution Combustion Process Using Glycine Fuel

Cited by 12 publications

References 5 publications

Scandium: An efficient dopant to modulate the optical spectrum of vanadium dioxide (VO2)

Scandium: An efficient dopant to modulate the optical spectrum of vanadium dioxide (VO2)

Combustion synthesis and characterization of Sr3Al2O6

Review on calcium‐ and magnesium‐based silicates for bone tissue engineering applications

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Product

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Combustion synthesis and characterization of Sr₃Al₂O₆