Sathiya R Priya | Mahendra Engineering College (original) (raw)

Papers by Sathiya R Priya

Silver nanoparticles were prepared by chemical reduction method using sodium citrate as reducing ... more Silver nanoparticles were prepared by chemical reduction method using sodium citrate as reducing agent, followed by capping with various concentrations of β-Cyclodextrin (β-CD) and characterized by various physicchemical characterization techniques. Antibacterial activity of Pseudomonas aeruginosa (Gram-negative) and Staphylococcus aureus (Gram-positive) was determined by Well-Diffusion method. The nano-silver were spherical under Scanning electron microscopy (SEM) and the XRD result shows average diameters of capped particles are smaller than their equivalent uncapped particles. Capped nano silver particles of four different concentrations were demonstrated as superior for photo stability, when exposed to intense ultraviolet (UV-Vis) radiation for 4 hours, as well as significantly higher antibacterial activity. The influence of β-CD concentration (5 mM, 10 mM and 15 mM) was seems to be delay in bacterial growth, showing that a Trojan horse mechanism may be owing to occur bacterial ...

International Journal of Advanced Science and Engineering, 2018

Natural Product Communications, 2018

The naturally occurring polysaccharide hyaluronic acid (HA) is a major component of the extracell... more The naturally occurring polysaccharide hyaluronic acid (HA) is a major component of the extracellular matrix and is found over expressed in many cancer cells. Hyaluronic acid is reported to be a potential carrier for drug delivery with the dual advantage of accumulation at the tumor site and receptor-mediated uptake. The use of drugs conjugated with macromolecules was shown to improve the drug pharmacokinetic profile. The various biological potentials such as biodegradability, biocompatibility, non-toxicity, hydrophilicity and non-immunogenicity, together with the availability of various chemical groups that allow the conjugation of drugs, put forward HA as a potential choice for the development of drug conjugates. In this context, the present study is focused to provide, through docking studies, insights on the activity of cancer drugs such as methotrexate, 3′,5′-dichloromethotrexate and ornithine-methotrexate and their activity against the receptor caspase-1, which is a well-estab...

Journal of Alloys and Compounds, 2016

Nanocrystalline WO 3 .H 2 O nanopowders, doped with cobalt (2 and 5 wt%) have been synthesized us... more Nanocrystalline WO 3 .H 2 O nanopowders, doped with cobalt (2 and 5 wt%) have been synthesized using CoCl 2 .6H 2 O and Na 2 WO 4 .2H 2 O in a facile microwave irradiation process, followed by the annealing process. The samples were characterized with powder X-ray diffraction, field emission scanning electron microscopy, UV-VIS diffusion reflectance spectroscopy, photoluminescence spectroscopy and cyclic voltammetry (CV). X-ray diffraction patterns showed both undoped and Co doped WO 3 .H 2 O crystallized with orthorhombic phase. Annealing h-WO 3 at 600˚C 6h in air resulted in the different products, W 17 O 47 (monoclinic) for undoped, WO 3 orthorhombic for 2 wt% Co doped and WO 3 (monoclinic) for 5 wt% Co doped. FE-SEM micrographs suggested that the dopants are able to influence the growth rate and morphology of the prepared nanopowders. UV-VIS-DRS spectra revealed that the dopant (Co ion) is incorporated in the intermediate energy level. Blue emissions (450-550 nm) were verified using PL at room temperature for the annealed samples (W 17 O 47 and WO 3) with excitation wavelength 390 nm. The difference in peak intensity observed through PL spectra attributed to the possible distortions in WO 4 2tetrahedron group during microwave irradiation process. Electrochemical studies showed the possible enhanced catalytic behavior of cobalt doped (5wt.%) as prepared samples than that of others. The temperature dependent magnetic susceptibility (300 K to 2 K) and isothermal magnetization measurements showed the enhancement in magnetic behaviour of the samples for diamagnetic to antiferromagnetic nature which is clearly shows the incorporation of Cobalt ion at tungsten lattice site and in determining the resultant magnetic behaviour of the samples.

Ecotoxicology and Environmental Safety, 2016

Biosynthesis of metal nanoparticles is the present research in the limb of nanotechnology which r... more Biosynthesis of metal nanoparticles is the present research in the limb of nanotechnology which reduces the toxicity of metal nanoparticles. Green chemistry approach emphasizes that the usage of plant material has offered a reliable, simple, nontoxic and eco-friendly that links Nanotechnology and Biotechnology. Increasing environmental concerns over chemical synthesis routes have resulted in attempts to develop bio-mimetic approaches. The current study deals with novel method for biosynthesis of AgNPs using Pongamia pinnata leaf extract as reducing agent. These biosynthesized nanoparticles were characterized with the help of UV-vis Spectroscopy, Photoluminescence (PL) and Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Atomic force microscopy (AFM), Dynamic light scattering (DLS) and Zeta Potential (ZP). Free radical scavenging potential of P. pinnata synthesized silver nanoparticles was evaluated in vitro by using five different assays viz., DPPH, ABT þ S , Hydroxyl, Superoxide anion and Nitric oxide scavenging assays are also adopted. Capping of AgNPs by various polyphenolic compounds present in P. pinnata leaf extract appears to be a major contributor to lower toxicity compared to chemically synthesized AgNPs. The surface plasmon resonance shows 425 nm and grain size of the AgNPs was measured from XRD and FTIR revealed the bioconjucation of AgNPs. The in vitro antioxidant activity of AgNPs showed a significant effect on scavenging of free radicals. The results suggest that the silver nanoparticles from P. pinnata can be potent natural antioxidants and can be essential for health preservation against oxidative stress related degenerative diseases, such as cancer. The vitality of this study lies in the formation of silver nanoparticles by utilizing the wealth of global ecological resources, eliminating obnoxious and toxic reagents which are hazardous to be handled as well as to be applied.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, Jan 5, 2015

The presence of surfactant (CTAB) at three different concentrations viz., (0.5, 1 and 1.5 M) on z... more The presence of surfactant (CTAB) at three different concentrations viz., (0.5, 1 and 1.5 M) on zinc oxide (ZnO) nanocrystalline at 550°C was synthesized. The optical properties of each surfactant capped zinc oxide nanocrystalline were investigated using UV-Visible absorption. The characterization of these nanocrystalline was performed by X-ray diffractometer Spectrum (XRD), Scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), and Atomic force microscopy (AFM) and Fourier transformer infrared (FTIR) spectroscopy. The effect of CTAB on the morphology of the ZnO was studied by SEM/EDS which revealed that the diameter of the product is in the range of 42-70 nm. Out of the three surfactant concentrations CTAB (0.5 M) capped zinc oxide nanoparticle has smallest crystalline size of 19.4 nm. Thus, the presence of surfactant on the surface of zinc oxide plays a significant role in reducing defect. The excitonic UV emission has been observed at 275 nm.

Crystal Research and Technology, 2009

Single crystals of the NLO active lithium sulphate monohydrate were grown successfully by slow ev... more Single crystals of the NLO active lithium sulphate monohydrate were grown successfully by slow evaporation technique. The as-grown crystal was clear, transparent and the size of the crystal attained was 14 x 8 x 5 mm 3 within a period of 4 weeks. The crystal was subjected to Fourier transform infrared spectroscopy (FTIR), Thermal analysis (TG/DTA), UV-Vis analysis, mechanical and dielectric studies. Theoretical calculations for band gap energy were made. An attempt was made to calculate polarizability by Penn analysis and compare with the traditional method and results are tabulated.

The photocatalytic response of the biosynthesized AgNPs from Pongamia pinnata, Psidium guajava an... more The photocatalytic response of the biosynthesized AgNPs from Pongamia pinnata, Psidium guajava and Carica papaya were studied. The performance of a photo decolorization reaction was determined by the quality and property of the photocatalyst. The photocatalytic activity of the synthesized AgNPs was examined by degradation of methylene blue under natural sunlight irradiation. The rate constant in photocatalytic degradation with respect to time, in the presence of AgNPs was evaluated. The green synthesized AgNPs effectively degraded the dye under the natural sunlight and evaluated at different exposure times.

Volume 5 No.3; 2019, 2019

Nanotechnology is nothing but a branch of technology smaller in size, lighter in weight, stronger... more Nanotechnology is nothing but a branch of technology smaller in size, lighter in weight, stronger in strength due to its large surface area to volume ratio. The applications of nanotechnology have been widely used by several industries globally, especially in the development of innovative products using novel materials in cosmetics, paints, ceramic, textile coatings and pharmaceuticals. Nanoparticles have been designed in different morphological structures at the microscopic level such as nanospheres, nanotubes, nanorods, nanowires, nanoplatelets, nanoflower, nanoparticles and nanoneedle. By bearing in mind the importance of Nano dimensional material, the present review article, therefore, focuses on the reviews of the advances and development of nanotechnology applications to cosmetics, paints, textile and medical research.

International Journal of Advanced Science and Engineering, 2019

International Journal of Advanced Science and Engineering, 2019

Nanotechnology is nothing but a branch of technology smaller in size, lighter in weight, stronger... more Nanotechnology is nothing but a branch of technology smaller in size, lighter in weight, stronger in strength due to its large surface area to volume ratio. The applications of nanotechnology have been widely used by several industries globally, especially in the development of innovative products using novel materials in cosmetics, paints, ceramic, textile coatings and pharmaceuticals. Nanoparticles have been designed in different morphological structures at the microscopic level such as nanospheres, nanotubes, nanorods, nanowires, nanoplatelets, nanoflower, nanoparticles and nanoneedle. By bearing in mind the importance of Nano dimensional material, the present review article, therefore, focuses on the reviews of the advances and development of nanotechnology applications to cosmetics, paints, textile and medical research.

IOP Publishing, 2019

Silver nanoparticles were synthesized in an aqueous solution of silver nitrate using Carica papay... more Silver nanoparticles were synthesized in an aqueous solution of silver nitrate using Carica papaya leaf extract as the reducing agent. These nanoparticles were characterized by photoluminescence and UV-Vis spectroscopy. Fourier-transform infrared spectroscopy results showed that the nanoparticles were capped with biomoites that are responsible for efficient stabilization. XRD analysis revealed that most nanoparticles were spherical in shape with a face-centered cubic structure and crystalline grains. Moreover, Atomic Force Microscopy (AFM) showed that the grain size ranged from 7 to 32 nm, which agreed with the XRD results. The calculated zeta potential was found to be −15.58 mV, which indicated good stability. The antibacterial activity results showed that the synthesized silver nanoparticles exhibited excellent activity against Pseudomonas aeruginosa and Klebsiella pneumoniae. The molecular docking study revealed that the antiviral activity of the C. papaya leaf extract showed good binding affinity against dengue type 2 virus non-structural protein 1.

International Journal of Advanced Science and Engineering, 2018

In this paper we investigate fuzzy soft semi Baire spaces are studied and introduced the characte... more In this paper we investigate fuzzy soft semi Baire spaces are studied and introduced the characterizations of fuzzy soft semi baire spaces are studied. Several examples are given to illustrate the concepts introduced in this paper. ABSTRACT: The nanostructured ZrO2/TiO2 samples were synthesized by hydrothermal method, sensitized with anthraquinone dyes and the photovoltaic property was studied. The photovoltaic cells were assembled and the short-circuit current of the devices was measured under continuous illumination at 100 mW/cm 2 corresponding to the twice of the standard solar light intensity. The observed results of photocurrent and transmittance measurements as a function of wavelength show good performance in the presence of anthraquinone dyes. The synthesized materials were characterized using X-ray diffraction, field-emission scanning electron microscopy, UV-visible spectrophotometry and electrochemical impedance spectroscopy. The results reveal that the absorption of anthraquinone dyes in ZrO2/TiO2 combinations were found to be efficient to increase the short-circuit photocurrent and open-circuit voltage of the cell. An optimal power conversion efficiency of 3% was obtained in a dye-sensitized solar cell (DSSC) containing the ZrO2/TiO2 film. The study concluded that the selected material combinations were promising for the enhancement of the conversion efficiency for the fabrication of high efficient, low cost and high stable DSSCs.

International Journal of Advanced Science and Engineering, 2018

This paper present the synthesis and characterization of pure (WO3) and doped (Co = 2 and 5 wt.%)... more This paper present the synthesis and characterization of pure (WO3) and doped (Co = 2 and 5 wt.%) in a facile microwave irradiation process, followed by the annealing process at 600°C in air for 6 h in order to know the suitability of the material for superconducting applications. The samples were characterized with powder X-ray diffraction; field emission scanning electron microscopy, UV-VIS diffusion reflectance spectroscopy, and photoluminescence spectroscopy along with, the corresponding magnetic behaviors of the products were analyzed through electron spin resonance spectroscopy and vibrational sample magnetometer. X-ray diffraction patterns showed both undoped and doped WO3.H2O crystallized with orthorhombic phase. The annealing effect showed that doped WO3 (Co ≈ 2 wt.%) formed with orthorhombic phase and the remaining products were found to be monoclinic phase (pure and Co ≈ 5 wt.%) indicating the role of dopant in determining the crystalline phase of the end products. The effect of doping on crystalline perfection of the samples was also monitored using power X-ray analysis. FE-SEM micrographs suggested that the dopants are able to influence the growth rate and morphology of the prepared nanopowders. UV-VIS-DRS spectroscopy was employed to determine the optical band gap of these samples and the results revealed the incorporation of dopant (Co ion) in the intermediate energy level in determining the optical band gap. Blue emissions were verified using PL at room temperature for the annealed samples when exited with 390 nm wavelength. The room temperature PL spectra reveal the distortions in WO42- tetrahedron structure due to microwave irradiation on the samples. The hysteresis loops curve through vibrational sample magnetometer for annealed samples suggest that the cobalt doped samples revealed the suitability of the samples for super conducting applications, In addition with the above the coexistence of dia and ferromagnetism also observed in cobalt doped samples suggests the role of dopant in fixing the magnetic behaviour of the resultant samples.

International Journal of Advanced Science and Engineering, 2017

Silver nanoparticles were synthesized at four different calcinations temperature viz., 150°C, 200... more Silver nanoparticles were synthesized at four different calcinations temperature viz., 150°C, 200°C, 250°C and 300°C by chemical reduction method. Silver nitrate was taken as precursor and sodium citrate as a reducing agent. The prepared silver nanoparticles were identified by UV-Vis absorption spectroscopy. Structural, morphological and size of the synthesized nanoparticles were characterized by XRD, SEM/EDS and particle analysis showed that the nano silver (Ag) samples are spherical with particle sizes of 0-95 nm by using particles size analyzer. Also we confirmed that the size of the silver nanoparticles was affected by the calcinations temperature. Antimicrobial activity of silver nanoparticles is important to control conventional antimicrobial agents. Bacterial and fungal contamination is a serious problem. This work evaluates the potential of nano silver to remove bacterial and fungal contaminants. The Experiment involved with three different bacteria's viz., Escherichia coli sp., Pseudomonas sp., and streptococcus sp., in MHA medium and three different fungus viz., Aspergillus sp., Pencilluim sp., Rhizopus sp., in SDA medium. The results show that nano silver has a good potential for removing of the bacterial and fungal contaminants in human.

Magnesium doped tin oxide nanoparticles were synthesized by chemical co-precipitation method. The... more Magnesium doped tin oxide nanoparticles were synthesized by chemical co-precipitation method. The structural, functional, morphological and optical properties were investigated by X-ray diffraction, Scanning Electron Microscope (SEM), UV-Vis spectroscopy, Fourier Transform Infrared Spectroscopy (FT-IR) and Photoluminescence (PL) techniques. The result confirms that all samples are in pure rutile tetragonal phase. The tetragonal structure of tin oxide remains constant in presence of Mg doping but the grain size decreases from 16nm to 10nm for 1wt % and 3 wt%, respectively. The effective strain values of the samples increases with increasing of Mg doping. The lattice constant, a/c ratio and cell volume were calculated from XRD data and the results are reported. FT-IR results show the presence of oxide groups in SnO2.

The naturally occurring polysaccharide hyaluronic acid (HA) is a major component of the extracell... more The naturally occurring polysaccharide hyaluronic acid (HA) is a major component of the extracellular matrix and is found over expressed in many cancer cells. Hyaluronic acid is reported to be a potential carrier for drug delivery with the dual advantage of accumulation at the tumor site and receptor-mediated uptake. The use of drugs conjugated with macromolecules was shown to improve the drug pharmacokinetic profile. The various biological potentials such as biodegradability, biocompatibility, non-toxicity, hydrophilicity and non-immunogenicity, together with the availability of various chemical groups that allow the conjugation of drugs, put forward HA as a potential choice for the development of drug conjugates. In this context, the present study is focused to provide, through docking studies, insights on the activity of cancer drugs such as methotrexate, 3',5'-dichloromethotrexate and ornithine-methotrexate and their activity against the receptor caspase-1, which is a well-established drug target in the treatment of cancer. The docking study envisages that the usage of methotrexate properly conjugated to the natural polysaccharide HA might serve as a potential drug to effectively treat some cancer diseases.

The physical and chemical method employed in production of silver nanoparticles is expensive and ... more The physical and chemical method employed in production of silver nanoparticles is expensive and the reagents used are toxic. This paper deals with the production of silver nanoparticles using biological compounds by biosynthesis method. Silver nitrate is reduced by the peel extracts of Pomegranate, which act as a reducing agent as well as stabilizing agent due to the presence of biomolecules. The characterization of the silver nanoparticles was done using XRD and FTIR. The approach of fruit-mediated synthesis appears to be cost efficient eco-friendly and easy alternative to conventional methods of silver nanoparticles synthesis.

Nanocrystalline WO 3 H2Onanopowders,dopedwithcobalt(2and5wtH 2 O nanopowders, doped with cobalt (2 and 5 wt%) have been synthesized us... more Nanocrystalline WO 3 H2Onanopowders,dopedwithcobalt(2and5wtH 2 O nanopowders, doped with cobalt (2 and 5 wt%) have been synthesized using CoCl 2 6H2OandNa2WO46H 2 O and Na 2 WO 4 6H2OandNa2WO42H 2 O in a facile microwave irradiation process, followed by the annealing process. The samples were characterized with powder X-ray diffraction, field emission scanning electron microscopy, UV-VIS diffusion reflectance spectroscopy, photoluminescence spectroscopy and cyclic voltammetry (CV). X-ray diffraction patterns showed both undoped and Co doped WO 3 $H 2 O crystallized with orthorhombic phase. Annealing h-WO 3 at 600 C 6 h in air resulted in the different products, W 17 O 47 (monoclinic) for undoped, WO 3 orthorhombic for 2 wt% Co doped and WO 3 (monoclinic) for 5 wt % Co doped. FE-SEM micrographs suggested that the dopants are able to influence the growth rate and morphology of the prepared nanopowders. UV-VIS-DRS spectra revealed that the dopant (Co ion) is incorporated in the intermediate energy level. Blue emissions (450e550 nm) were verified using PL at room temperature for the annealed samples (W 17 O 47 and WO 3) with excitation wavelength 390 nm. The difference in peak intensity observed through PL spectra attributed to the possible distortions in WO 4 2À tetrahedron group during microwave irradiation process. Electrochemical studies showed the possible enhanced catalytic behaviour of cobalt doped (5 wt%) as prepared samples than that of others. The temperature dependent magnetic susceptibility (300 Ke2 K) and isothermal magnetization measurements showed the enhancement in magnetic behaviour of the samples for diamagnetic to antiferro-magnetic nature which is clearly shows the incorporation of Cobalt ion at tungsten lattice site and in determining the resultant magnetic behaviour of the samples.

Silver nanoparticles were prepared by chemical reduction method using sodium citrate as reducing ... more Silver nanoparticles were prepared by chemical reduction method using sodium citrate as reducing agent, followed by capping with various concentrations of β-Cyclodextrin (β-CD) and characterized by various physicchemical characterization techniques. Antibacterial activity of Pseudomonas aeruginosa (Gram-negative) and Staphylococcus aureus (Gram-positive) was determined by Well-Diffusion method. The nano-silver were spherical under Scanning electron microscopy (SEM) and the XRD result shows average diameters of capped particles are smaller than their equivalent uncapped particles. Capped nano silver particles of four different concentrations were demonstrated as superior for photo stability, when exposed to intense ultraviolet (UV-Vis) radiation for 4 hours, as well as significantly higher antibacterial activity. The influence of β-CD concentration (5 mM, 10 mM and 15 mM) was seems to be delay in bacterial growth, showing that a Trojan horse mechanism may be owing to occur bacterial ...

International Journal of Advanced Science and Engineering, 2018

Natural Product Communications, 2018

The naturally occurring polysaccharide hyaluronic acid (HA) is a major component of the extracell... more The naturally occurring polysaccharide hyaluronic acid (HA) is a major component of the extracellular matrix and is found over expressed in many cancer cells. Hyaluronic acid is reported to be a potential carrier for drug delivery with the dual advantage of accumulation at the tumor site and receptor-mediated uptake. The use of drugs conjugated with macromolecules was shown to improve the drug pharmacokinetic profile. The various biological potentials such as biodegradability, biocompatibility, non-toxicity, hydrophilicity and non-immunogenicity, together with the availability of various chemical groups that allow the conjugation of drugs, put forward HA as a potential choice for the development of drug conjugates. In this context, the present study is focused to provide, through docking studies, insights on the activity of cancer drugs such as methotrexate, 3′,5′-dichloromethotrexate and ornithine-methotrexate and their activity against the receptor caspase-1, which is a well-estab...

Journal of Alloys and Compounds, 2016

Nanocrystalline WO 3 .H 2 O nanopowders, doped with cobalt (2 and 5 wt%) have been synthesized us... more Nanocrystalline WO 3 .H 2 O nanopowders, doped with cobalt (2 and 5 wt%) have been synthesized using CoCl 2 .6H 2 O and Na 2 WO 4 .2H 2 O in a facile microwave irradiation process, followed by the annealing process. The samples were characterized with powder X-ray diffraction, field emission scanning electron microscopy, UV-VIS diffusion reflectance spectroscopy, photoluminescence spectroscopy and cyclic voltammetry (CV). X-ray diffraction patterns showed both undoped and Co doped WO 3 .H 2 O crystallized with orthorhombic phase. Annealing h-WO 3 at 600˚C 6h in air resulted in the different products, W 17 O 47 (monoclinic) for undoped, WO 3 orthorhombic for 2 wt% Co doped and WO 3 (monoclinic) for 5 wt% Co doped. FE-SEM micrographs suggested that the dopants are able to influence the growth rate and morphology of the prepared nanopowders. UV-VIS-DRS spectra revealed that the dopant (Co ion) is incorporated in the intermediate energy level. Blue emissions (450-550 nm) were verified using PL at room temperature for the annealed samples (W 17 O 47 and WO 3) with excitation wavelength 390 nm. The difference in peak intensity observed through PL spectra attributed to the possible distortions in WO 4 2tetrahedron group during microwave irradiation process. Electrochemical studies showed the possible enhanced catalytic behavior of cobalt doped (5wt.%) as prepared samples than that of others. The temperature dependent magnetic susceptibility (300 K to 2 K) and isothermal magnetization measurements showed the enhancement in magnetic behaviour of the samples for diamagnetic to antiferromagnetic nature which is clearly shows the incorporation of Cobalt ion at tungsten lattice site and in determining the resultant magnetic behaviour of the samples.

Ecotoxicology and Environmental Safety, 2016

Biosynthesis of metal nanoparticles is the present research in the limb of nanotechnology which r... more Biosynthesis of metal nanoparticles is the present research in the limb of nanotechnology which reduces the toxicity of metal nanoparticles. Green chemistry approach emphasizes that the usage of plant material has offered a reliable, simple, nontoxic and eco-friendly that links Nanotechnology and Biotechnology. Increasing environmental concerns over chemical synthesis routes have resulted in attempts to develop bio-mimetic approaches. The current study deals with novel method for biosynthesis of AgNPs using Pongamia pinnata leaf extract as reducing agent. These biosynthesized nanoparticles were characterized with the help of UV-vis Spectroscopy, Photoluminescence (PL) and Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Atomic force microscopy (AFM), Dynamic light scattering (DLS) and Zeta Potential (ZP). Free radical scavenging potential of P. pinnata synthesized silver nanoparticles was evaluated in vitro by using five different assays viz., DPPH, ABT þ S , Hydroxyl, Superoxide anion and Nitric oxide scavenging assays are also adopted. Capping of AgNPs by various polyphenolic compounds present in P. pinnata leaf extract appears to be a major contributor to lower toxicity compared to chemically synthesized AgNPs. The surface plasmon resonance shows 425 nm and grain size of the AgNPs was measured from XRD and FTIR revealed the bioconjucation of AgNPs. The in vitro antioxidant activity of AgNPs showed a significant effect on scavenging of free radicals. The results suggest that the silver nanoparticles from P. pinnata can be potent natural antioxidants and can be essential for health preservation against oxidative stress related degenerative diseases, such as cancer. The vitality of this study lies in the formation of silver nanoparticles by utilizing the wealth of global ecological resources, eliminating obnoxious and toxic reagents which are hazardous to be handled as well as to be applied.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, Jan 5, 2015

The presence of surfactant (CTAB) at three different concentrations viz., (0.5, 1 and 1.5 M) on z... more The presence of surfactant (CTAB) at three different concentrations viz., (0.5, 1 and 1.5 M) on zinc oxide (ZnO) nanocrystalline at 550°C was synthesized. The optical properties of each surfactant capped zinc oxide nanocrystalline were investigated using UV-Visible absorption. The characterization of these nanocrystalline was performed by X-ray diffractometer Spectrum (XRD), Scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), and Atomic force microscopy (AFM) and Fourier transformer infrared (FTIR) spectroscopy. The effect of CTAB on the morphology of the ZnO was studied by SEM/EDS which revealed that the diameter of the product is in the range of 42-70 nm. Out of the three surfactant concentrations CTAB (0.5 M) capped zinc oxide nanoparticle has smallest crystalline size of 19.4 nm. Thus, the presence of surfactant on the surface of zinc oxide plays a significant role in reducing defect. The excitonic UV emission has been observed at 275 nm.

Crystal Research and Technology, 2009

Single crystals of the NLO active lithium sulphate monohydrate were grown successfully by slow ev... more Single crystals of the NLO active lithium sulphate monohydrate were grown successfully by slow evaporation technique. The as-grown crystal was clear, transparent and the size of the crystal attained was 14 x 8 x 5 mm 3 within a period of 4 weeks. The crystal was subjected to Fourier transform infrared spectroscopy (FTIR), Thermal analysis (TG/DTA), UV-Vis analysis, mechanical and dielectric studies. Theoretical calculations for band gap energy were made. An attempt was made to calculate polarizability by Penn analysis and compare with the traditional method and results are tabulated.

The photocatalytic response of the biosynthesized AgNPs from Pongamia pinnata, Psidium guajava an... more The photocatalytic response of the biosynthesized AgNPs from Pongamia pinnata, Psidium guajava and Carica papaya were studied. The performance of a photo decolorization reaction was determined by the quality and property of the photocatalyst. The photocatalytic activity of the synthesized AgNPs was examined by degradation of methylene blue under natural sunlight irradiation. The rate constant in photocatalytic degradation with respect to time, in the presence of AgNPs was evaluated. The green synthesized AgNPs effectively degraded the dye under the natural sunlight and evaluated at different exposure times.

Volume 5 No.3; 2019, 2019

Nanotechnology is nothing but a branch of technology smaller in size, lighter in weight, stronger... more Nanotechnology is nothing but a branch of technology smaller in size, lighter in weight, stronger in strength due to its large surface area to volume ratio. The applications of nanotechnology have been widely used by several industries globally, especially in the development of innovative products using novel materials in cosmetics, paints, ceramic, textile coatings and pharmaceuticals. Nanoparticles have been designed in different morphological structures at the microscopic level such as nanospheres, nanotubes, nanorods, nanowires, nanoplatelets, nanoflower, nanoparticles and nanoneedle. By bearing in mind the importance of Nano dimensional material, the present review article, therefore, focuses on the reviews of the advances and development of nanotechnology applications to cosmetics, paints, textile and medical research.

International Journal of Advanced Science and Engineering, 2019

International Journal of Advanced Science and Engineering, 2019

Nanotechnology is nothing but a branch of technology smaller in size, lighter in weight, stronger... more Nanotechnology is nothing but a branch of technology smaller in size, lighter in weight, stronger in strength due to its large surface area to volume ratio. The applications of nanotechnology have been widely used by several industries globally, especially in the development of innovative products using novel materials in cosmetics, paints, ceramic, textile coatings and pharmaceuticals. Nanoparticles have been designed in different morphological structures at the microscopic level such as nanospheres, nanotubes, nanorods, nanowires, nanoplatelets, nanoflower, nanoparticles and nanoneedle. By bearing in mind the importance of Nano dimensional material, the present review article, therefore, focuses on the reviews of the advances and development of nanotechnology applications to cosmetics, paints, textile and medical research.

IOP Publishing, 2019

Silver nanoparticles were synthesized in an aqueous solution of silver nitrate using Carica papay... more Silver nanoparticles were synthesized in an aqueous solution of silver nitrate using Carica papaya leaf extract as the reducing agent. These nanoparticles were characterized by photoluminescence and UV-Vis spectroscopy. Fourier-transform infrared spectroscopy results showed that the nanoparticles were capped with biomoites that are responsible for efficient stabilization. XRD analysis revealed that most nanoparticles were spherical in shape with a face-centered cubic structure and crystalline grains. Moreover, Atomic Force Microscopy (AFM) showed that the grain size ranged from 7 to 32 nm, which agreed with the XRD results. The calculated zeta potential was found to be −15.58 mV, which indicated good stability. The antibacterial activity results showed that the synthesized silver nanoparticles exhibited excellent activity against Pseudomonas aeruginosa and Klebsiella pneumoniae. The molecular docking study revealed that the antiviral activity of the C. papaya leaf extract showed good binding affinity against dengue type 2 virus non-structural protein 1.

International Journal of Advanced Science and Engineering, 2018

In this paper we investigate fuzzy soft semi Baire spaces are studied and introduced the characte... more In this paper we investigate fuzzy soft semi Baire spaces are studied and introduced the characterizations of fuzzy soft semi baire spaces are studied. Several examples are given to illustrate the concepts introduced in this paper. ABSTRACT: The nanostructured ZrO2/TiO2 samples were synthesized by hydrothermal method, sensitized with anthraquinone dyes and the photovoltaic property was studied. The photovoltaic cells were assembled and the short-circuit current of the devices was measured under continuous illumination at 100 mW/cm 2 corresponding to the twice of the standard solar light intensity. The observed results of photocurrent and transmittance measurements as a function of wavelength show good performance in the presence of anthraquinone dyes. The synthesized materials were characterized using X-ray diffraction, field-emission scanning electron microscopy, UV-visible spectrophotometry and electrochemical impedance spectroscopy. The results reveal that the absorption of anthraquinone dyes in ZrO2/TiO2 combinations were found to be efficient to increase the short-circuit photocurrent and open-circuit voltage of the cell. An optimal power conversion efficiency of 3% was obtained in a dye-sensitized solar cell (DSSC) containing the ZrO2/TiO2 film. The study concluded that the selected material combinations were promising for the enhancement of the conversion efficiency for the fabrication of high efficient, low cost and high stable DSSCs.

International Journal of Advanced Science and Engineering, 2018

This paper present the synthesis and characterization of pure (WO3) and doped (Co = 2 and 5 wt.%)... more This paper present the synthesis and characterization of pure (WO3) and doped (Co = 2 and 5 wt.%) in a facile microwave irradiation process, followed by the annealing process at 600°C in air for 6 h in order to know the suitability of the material for superconducting applications. The samples were characterized with powder X-ray diffraction; field emission scanning electron microscopy, UV-VIS diffusion reflectance spectroscopy, and photoluminescence spectroscopy along with, the corresponding magnetic behaviors of the products were analyzed through electron spin resonance spectroscopy and vibrational sample magnetometer. X-ray diffraction patterns showed both undoped and doped WO3.H2O crystallized with orthorhombic phase. The annealing effect showed that doped WO3 (Co ≈ 2 wt.%) formed with orthorhombic phase and the remaining products were found to be monoclinic phase (pure and Co ≈ 5 wt.%) indicating the role of dopant in determining the crystalline phase of the end products. The effect of doping on crystalline perfection of the samples was also monitored using power X-ray analysis. FE-SEM micrographs suggested that the dopants are able to influence the growth rate and morphology of the prepared nanopowders. UV-VIS-DRS spectroscopy was employed to determine the optical band gap of these samples and the results revealed the incorporation of dopant (Co ion) in the intermediate energy level in determining the optical band gap. Blue emissions were verified using PL at room temperature for the annealed samples when exited with 390 nm wavelength. The room temperature PL spectra reveal the distortions in WO42- tetrahedron structure due to microwave irradiation on the samples. The hysteresis loops curve through vibrational sample magnetometer for annealed samples suggest that the cobalt doped samples revealed the suitability of the samples for super conducting applications, In addition with the above the coexistence of dia and ferromagnetism also observed in cobalt doped samples suggests the role of dopant in fixing the magnetic behaviour of the resultant samples.

International Journal of Advanced Science and Engineering, 2017

Silver nanoparticles were synthesized at four different calcinations temperature viz., 150°C, 200... more Silver nanoparticles were synthesized at four different calcinations temperature viz., 150°C, 200°C, 250°C and 300°C by chemical reduction method. Silver nitrate was taken as precursor and sodium citrate as a reducing agent. The prepared silver nanoparticles were identified by UV-Vis absorption spectroscopy. Structural, morphological and size of the synthesized nanoparticles were characterized by XRD, SEM/EDS and particle analysis showed that the nano silver (Ag) samples are spherical with particle sizes of 0-95 nm by using particles size analyzer. Also we confirmed that the size of the silver nanoparticles was affected by the calcinations temperature. Antimicrobial activity of silver nanoparticles is important to control conventional antimicrobial agents. Bacterial and fungal contamination is a serious problem. This work evaluates the potential of nano silver to remove bacterial and fungal contaminants. The Experiment involved with three different bacteria's viz., Escherichia coli sp., Pseudomonas sp., and streptococcus sp., in MHA medium and three different fungus viz., Aspergillus sp., Pencilluim sp., Rhizopus sp., in SDA medium. The results show that nano silver has a good potential for removing of the bacterial and fungal contaminants in human.

Magnesium doped tin oxide nanoparticles were synthesized by chemical co-precipitation method. The... more Magnesium doped tin oxide nanoparticles were synthesized by chemical co-precipitation method. The structural, functional, morphological and optical properties were investigated by X-ray diffraction, Scanning Electron Microscope (SEM), UV-Vis spectroscopy, Fourier Transform Infrared Spectroscopy (FT-IR) and Photoluminescence (PL) techniques. The result confirms that all samples are in pure rutile tetragonal phase. The tetragonal structure of tin oxide remains constant in presence of Mg doping but the grain size decreases from 16nm to 10nm for 1wt % and 3 wt%, respectively. The effective strain values of the samples increases with increasing of Mg doping. The lattice constant, a/c ratio and cell volume were calculated from XRD data and the results are reported. FT-IR results show the presence of oxide groups in SnO2.

The naturally occurring polysaccharide hyaluronic acid (HA) is a major component of the extracell... more The naturally occurring polysaccharide hyaluronic acid (HA) is a major component of the extracellular matrix and is found over expressed in many cancer cells. Hyaluronic acid is reported to be a potential carrier for drug delivery with the dual advantage of accumulation at the tumor site and receptor-mediated uptake. The use of drugs conjugated with macromolecules was shown to improve the drug pharmacokinetic profile. The various biological potentials such as biodegradability, biocompatibility, non-toxicity, hydrophilicity and non-immunogenicity, together with the availability of various chemical groups that allow the conjugation of drugs, put forward HA as a potential choice for the development of drug conjugates. In this context, the present study is focused to provide, through docking studies, insights on the activity of cancer drugs such as methotrexate, 3',5'-dichloromethotrexate and ornithine-methotrexate and their activity against the receptor caspase-1, which is a well-established drug target in the treatment of cancer. The docking study envisages that the usage of methotrexate properly conjugated to the natural polysaccharide HA might serve as a potential drug to effectively treat some cancer diseases.

The physical and chemical method employed in production of silver nanoparticles is expensive and ... more The physical and chemical method employed in production of silver nanoparticles is expensive and the reagents used are toxic. This paper deals with the production of silver nanoparticles using biological compounds by biosynthesis method. Silver nitrate is reduced by the peel extracts of Pomegranate, which act as a reducing agent as well as stabilizing agent due to the presence of biomolecules. The characterization of the silver nanoparticles was done using XRD and FTIR. The approach of fruit-mediated synthesis appears to be cost efficient eco-friendly and easy alternative to conventional methods of silver nanoparticles synthesis.

Nanocrystalline WO 3 H2Onanopowders,dopedwithcobalt(2and5wtH 2 O nanopowders, doped with cobalt (2 and 5 wt%) have been synthesized us... more Nanocrystalline WO 3 H2Onanopowders,dopedwithcobalt(2and5wtH 2 O nanopowders, doped with cobalt (2 and 5 wt%) have been synthesized using CoCl 2 6H2OandNa2WO46H 2 O and Na 2 WO 4 6H2OandNa2WO42H 2 O in a facile microwave irradiation process, followed by the annealing process. The samples were characterized with powder X-ray diffraction, field emission scanning electron microscopy, UV-VIS diffusion reflectance spectroscopy, photoluminescence spectroscopy and cyclic voltammetry (CV). X-ray diffraction patterns showed both undoped and Co doped WO 3 $H 2 O crystallized with orthorhombic phase. Annealing h-WO 3 at 600 C 6 h in air resulted in the different products, W 17 O 47 (monoclinic) for undoped, WO 3 orthorhombic for 2 wt% Co doped and WO 3 (monoclinic) for 5 wt % Co doped. FE-SEM micrographs suggested that the dopants are able to influence the growth rate and morphology of the prepared nanopowders. UV-VIS-DRS spectra revealed that the dopant (Co ion) is incorporated in the intermediate energy level. Blue emissions (450e550 nm) were verified using PL at room temperature for the annealed samples (W 17 O 47 and WO 3) with excitation wavelength 390 nm. The difference in peak intensity observed through PL spectra attributed to the possible distortions in WO 4 2À tetrahedron group during microwave irradiation process. Electrochemical studies showed the possible enhanced catalytic behaviour of cobalt doped (5 wt%) as prepared samples than that of others. The temperature dependent magnetic susceptibility (300 Ke2 K) and isothermal magnetization measurements showed the enhancement in magnetic behaviour of the samples for diamagnetic to antiferro-magnetic nature which is clearly shows the incorporation of Cobalt ion at tungsten lattice site and in determining the resultant magnetic behaviour of the samples.