In this paper, we studied the spark corona discharge in tap and distillited waters. The results s... more In this paper, we studied the spark corona discharge in tap and distillited waters. The results show the shape of cone that generated on the tip of capillary tube is different with conductivity of liquids. The blue glow appears at the end of capillary tube and the drop extends into a cone. In addition, the conducitivity is affected on the relationship between the appearance of the blue glow discharge with the applied voltage. The size of the cone decreases with an increase in applied voltage. The cone diameter at the base of capillary tube oscillates with period approximately 1 Sec. this oscillates in the cone diameters is due to the change distance between the liquid electrode and the surface of liquid. The intensity of spark corona discharge that formed in tap water higher than that formed in distillited water. In addiation, when the applied voltage is 5 KV on distillted water, the drope extends into two cones while in tap water the drop extends into one cone. These contrast between two water types which under test (i.e. tap and distillited waters) is due to the differance in condictivity of water.
Mağallaẗ Tikrīt li-l-ʻulūm al-ṣirfaẗ, Dec 14, 2021
As a consequence of the spread of infectious illnesses caused by numerous harmful bacteria and th... more As a consequence of the spread of infectious illnesses caused by numerous harmful bacteria and the development of antibiotic resistance, researchers and pharmaceutical firms are seeking for novel antibacterial medicines. Furthermore, due to their high surface area to volume ratio (SA:V) and unique physical and chemical characteristics, Nano scale materials are emerging as novel antibacterial agents in the contemporary context. In this study, we show how to prepare Ag/ TiO2 NPs that are pure, stable, and high in concentration. By applying a pulsed laser (Nd:YAG) with different wavelengths of 1064 nm and a length of 532 nm resulting from the second harmonic generation using the KDP crystal, and with a wavelength of 355 nm resulting from the third harmonic generation using the nonlinear crystal KTP to a TiO2 plate submerged in Ag nanoparticle suspensions previously produced with various energies of 200, 400, 600, 800, and 1000mJ, Ag/ TiO2 NPs were created. The absorption peak for the sample obtained at 1000 mJ energy is greater than the absorption peak for the sample prepared at 200 mJ, which is attributable to increased nanoparticle concentration. At 440 nm, the remaining peaks are nearly fixed. The absorption rise when the laser wavelength was reduced from 1064 nm to 355 nm and the energy levels were increased from 200 to 1000 mJ, according to our findings. It was discovered that Ag/ TiO2 has an effect on bacterial activity, with the inhibition area rising as the laser intensity rises. E.coli were shown to be more resistant to Ag/TiO2than S.aureus.
This study used Green Spinach Leaf Extract for the green synthesis (monocolors) of silver nanopar... more This study used Green Spinach Leaf Extract for the green synthesis (monocolors) of silver nanoparticles (AgNPs). It focuses on the optimization of synthesis by evaluating the impact on each of the size distribution and activity of antibacterial activity against the bacteria (Escherichia coli) of the green spinach leaf extract volume percent. The characterization of AgNP's was carried out utilizing UV-Visible spectrophotometers, size examination of particles, transmission electron microscopes, energy spectrometry with dispersion X rays, Fourier infrared spectrometer transform, and x-ray scanning methods. The experimental data showed that AgNPs have been produced effectively and that the size of particle is controlled by the amount of green spinach leaf extract. With the size reaching (5 nm, polydispersity indices = 0.063 nm), the smaller volume percentage creates AgNPs with a spherically formed reach of 20%. The synthesized AgNPs by the spinach leaf extract had a good antibacterial activity, especially at the concentration of (500µg/ml) in which the inhibition zone reached 35mm against gram negative bacteria Escherichia coli.
In this study the gold nanoparticle are investigated to nd the optimum condition to manufacturing... more In this study the gold nanoparticle are investigated to nd the optimum condition to manufacturing NO 2 and H 2 S gas sensor. The laser ablation approach been extensively used in preparation prepare gold nanoparticles on a porous silicon substrate using n-type silicon wafers. Used a Nd-YAG laser with a (1064, 532) nm wavelength, numbers of shot 500 and energies (600, 800, and 1000) mJ. The morphological and optical of the Au nanoparticles are studied using scanning electron microscope (SEM), photoluminescence spectroscopy (PL), re ection spectra and study sensing properties. In AuNPs quantum con nement has an effect as seen by a slight shift in the high-energy side of the PL spectrum's peak. With longer wavelengths and lower energies, the crystal with the shorter wavelength 532 nm has a greater refractive index. We observe that it has the largest visible wavelength 591 nm and peaks that are displaced to higher wavelengths. The H 2 S and NO 2 gas sensors sensitivity, recuperation time, and reaction time built since prepared samples were all affected by changes in operation temperature. For each of the gases tested, the highest sensitivity was 30% in 532 nm and 155% in1064nm at 800 mJ for H 2 S gas while NO 2 gas was around 24% in 532 nm and 23% in 1064 nm at 800 mJ. The Au nanoparticles produced by laser ablation create excellent gas sensing and might be a viable solution for industrial gas sensing applications.
In this paper, Au NPs prepared by pulsed laser ablation in liquid (PLAL) with different laser ene... more In this paper, Au NPs prepared by pulsed laser ablation in liquid (PLAL) with different laser energy (200, 360,500,660 and 800 m J) with number of pulses (1000pulse), at wavelength 1064 nm, and repetition rate of 1Hz. The structural, morphological and optical properties were discussed. XRD spectra showed the diffraction peak. AFM showed the average diameter. The optical properties showed increase absorption spectra at increase energy. Further in vitro antibacterial activities of Au NPs were investigated against Gram positive and Gram negative. Staphylococcus aureus and E.Coli. Studied Toxicity of the synthesized Au NPs on human blood cells.
In this study the gold nanoparticle are investigated to find the optimum condition to manufacturi... more In this study the gold nanoparticle are investigated to find the optimum condition to manufacturing NO2 and H2S gas sensor. The laser ablation approach been extensively used in preparation prepare gold nanoparticles on a porous silicon substrate using n-type silicon wafers. Used a Nd-YAG laser with a (1064, 532) nm wavelength, numbers of shot 500 and energies (600, 800, and 1000) mJ. The morphological and optical of the Au nanoparticles are studied using scanning electron microscope (SEM), photoluminescence spectroscopy (PL), reflection spectra and study sensing properties. In AuNPs quantum confinement has an effect as seen by a slight shift in the high-energy side of the PL spectrum's peak. With longer wavelengths and lower energies, the crystal with the shorter wavelength 532 nm has a greater refractive index. We observe that it has the largest visible wavelength 591 nm and peaks that are displaced to higher wavelengths. The H2S and NO2 gas sensors sensitivity, recuperation ti...
Kirkuk University Journal-Scientific Studies, 2015
In this paper nanostructures Porous silicon layers have been prepared by electrochemical etching ... more In this paper nanostructures Porous silicon layers have been prepared by electrochemical etching (ECE) technique of (111) P-type silicon wafer with a solution Electrolytic HF: ethanol at a concentration of 1:2 with various anodization currents and etching time of 20 min. The morphological, structural and optical properties of nanostructure porous silicon were investigated by Atomic Force Microscopy (AFM), X-Ray Diffraction (XRD) and Photoluminescence (PL) respectively. From AFM images, we found that the PS layer has sponge like structure, and average diameter of pore and thickness of PS layer increased with increasing of the anodization currents. X-ray diffraction show that the crystal size was reduced toward nanometric scale, and then a broadening of diffraction peaks (111) was observed. The band gap of the samples was measured through the photoluminescence (PL) peak.
In this paper, we studied the spark corona discharge in tap and distillited waters. The results s... more In this paper, we studied the spark corona discharge in tap and distillited waters. The results show the shape of cone that generated on the tip of capillary tube is different with conductivity of liquids. The blue glow appears at the end of capillary tube and the drop extends into a cone. In addition, the conducitivity is affected on the relationship between the appearance of the blue glow discharge with the applied voltage. The size of the cone decreases with an increase in applied voltage. The cone diameter at the base of capillary tube oscillates with period approximately 1 Sec. this oscillates in the cone diameters is due to the change distance between the liquid electrode and the surface of liquid. The intensity of spark corona discharge that formed in tap water higher than that formed in distillited water. In addiation, when the applied voltage is 5 KV on distillted water, the drope extends into two cones while in tap water the drop extends into one cone. These contrast between two water types which under test (i.e. tap and distillited waters) is due to the differance in condictivity of water.
Mağallaẗ Tikrīt li-l-ʻulūm al-ṣirfaẗ, Dec 14, 2021
As a consequence of the spread of infectious illnesses caused by numerous harmful bacteria and th... more As a consequence of the spread of infectious illnesses caused by numerous harmful bacteria and the development of antibiotic resistance, researchers and pharmaceutical firms are seeking for novel antibacterial medicines. Furthermore, due to their high surface area to volume ratio (SA:V) and unique physical and chemical characteristics, Nano scale materials are emerging as novel antibacterial agents in the contemporary context. In this study, we show how to prepare Ag/ TiO2 NPs that are pure, stable, and high in concentration. By applying a pulsed laser (Nd:YAG) with different wavelengths of 1064 nm and a length of 532 nm resulting from the second harmonic generation using the KDP crystal, and with a wavelength of 355 nm resulting from the third harmonic generation using the nonlinear crystal KTP to a TiO2 plate submerged in Ag nanoparticle suspensions previously produced with various energies of 200, 400, 600, 800, and 1000mJ, Ag/ TiO2 NPs were created. The absorption peak for the sample obtained at 1000 mJ energy is greater than the absorption peak for the sample prepared at 200 mJ, which is attributable to increased nanoparticle concentration. At 440 nm, the remaining peaks are nearly fixed. The absorption rise when the laser wavelength was reduced from 1064 nm to 355 nm and the energy levels were increased from 200 to 1000 mJ, according to our findings. It was discovered that Ag/ TiO2 has an effect on bacterial activity, with the inhibition area rising as the laser intensity rises. E.coli were shown to be more resistant to Ag/TiO2than S.aureus.
This study used Green Spinach Leaf Extract for the green synthesis (monocolors) of silver nanopar... more This study used Green Spinach Leaf Extract for the green synthesis (monocolors) of silver nanoparticles (AgNPs). It focuses on the optimization of synthesis by evaluating the impact on each of the size distribution and activity of antibacterial activity against the bacteria (Escherichia coli) of the green spinach leaf extract volume percent. The characterization of AgNP's was carried out utilizing UV-Visible spectrophotometers, size examination of particles, transmission electron microscopes, energy spectrometry with dispersion X rays, Fourier infrared spectrometer transform, and x-ray scanning methods. The experimental data showed that AgNPs have been produced effectively and that the size of particle is controlled by the amount of green spinach leaf extract. With the size reaching (5 nm, polydispersity indices = 0.063 nm), the smaller volume percentage creates AgNPs with a spherically formed reach of 20%. The synthesized AgNPs by the spinach leaf extract had a good antibacterial activity, especially at the concentration of (500µg/ml) in which the inhibition zone reached 35mm against gram negative bacteria Escherichia coli.
In this study the gold nanoparticle are investigated to nd the optimum condition to manufacturing... more In this study the gold nanoparticle are investigated to nd the optimum condition to manufacturing NO 2 and H 2 S gas sensor. The laser ablation approach been extensively used in preparation prepare gold nanoparticles on a porous silicon substrate using n-type silicon wafers. Used a Nd-YAG laser with a (1064, 532) nm wavelength, numbers of shot 500 and energies (600, 800, and 1000) mJ. The morphological and optical of the Au nanoparticles are studied using scanning electron microscope (SEM), photoluminescence spectroscopy (PL), re ection spectra and study sensing properties. In AuNPs quantum con nement has an effect as seen by a slight shift in the high-energy side of the PL spectrum's peak. With longer wavelengths and lower energies, the crystal with the shorter wavelength 532 nm has a greater refractive index. We observe that it has the largest visible wavelength 591 nm and peaks that are displaced to higher wavelengths. The H 2 S and NO 2 gas sensors sensitivity, recuperation time, and reaction time built since prepared samples were all affected by changes in operation temperature. For each of the gases tested, the highest sensitivity was 30% in 532 nm and 155% in1064nm at 800 mJ for H 2 S gas while NO 2 gas was around 24% in 532 nm and 23% in 1064 nm at 800 mJ. The Au nanoparticles produced by laser ablation create excellent gas sensing and might be a viable solution for industrial gas sensing applications.
In this paper, Au NPs prepared by pulsed laser ablation in liquid (PLAL) with different laser ene... more In this paper, Au NPs prepared by pulsed laser ablation in liquid (PLAL) with different laser energy (200, 360,500,660 and 800 m J) with number of pulses (1000pulse), at wavelength 1064 nm, and repetition rate of 1Hz. The structural, morphological and optical properties were discussed. XRD spectra showed the diffraction peak. AFM showed the average diameter. The optical properties showed increase absorption spectra at increase energy. Further in vitro antibacterial activities of Au NPs were investigated against Gram positive and Gram negative. Staphylococcus aureus and E.Coli. Studied Toxicity of the synthesized Au NPs on human blood cells.
In this study the gold nanoparticle are investigated to find the optimum condition to manufacturi... more In this study the gold nanoparticle are investigated to find the optimum condition to manufacturing NO2 and H2S gas sensor. The laser ablation approach been extensively used in preparation prepare gold nanoparticles on a porous silicon substrate using n-type silicon wafers. Used a Nd-YAG laser with a (1064, 532) nm wavelength, numbers of shot 500 and energies (600, 800, and 1000) mJ. The morphological and optical of the Au nanoparticles are studied using scanning electron microscope (SEM), photoluminescence spectroscopy (PL), reflection spectra and study sensing properties. In AuNPs quantum confinement has an effect as seen by a slight shift in the high-energy side of the PL spectrum's peak. With longer wavelengths and lower energies, the crystal with the shorter wavelength 532 nm has a greater refractive index. We observe that it has the largest visible wavelength 591 nm and peaks that are displaced to higher wavelengths. The H2S and NO2 gas sensors sensitivity, recuperation ti...
Kirkuk University Journal-Scientific Studies, 2015
In this paper nanostructures Porous silicon layers have been prepared by electrochemical etching ... more In this paper nanostructures Porous silicon layers have been prepared by electrochemical etching (ECE) technique of (111) P-type silicon wafer with a solution Electrolytic HF: ethanol at a concentration of 1:2 with various anodization currents and etching time of 20 min. The morphological, structural and optical properties of nanostructure porous silicon were investigated by Atomic Force Microscopy (AFM), X-Ray Diffraction (XRD) and Photoluminescence (PL) respectively. From AFM images, we found that the PS layer has sponge like structure, and average diameter of pore and thickness of PS layer increased with increasing of the anodization currents. X-ray diffraction show that the crystal size was reduced toward nanometric scale, and then a broadening of diffraction peaks (111) was observed. The band gap of the samples was measured through the photoluminescence (PL) peak.
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