Suveda Aarya | CSK HPKV Palampur Kangra- 176062 (H.P) (original) (raw)

Papers by Suveda Aarya

Advances in Polymer Technology

Modifications taking place in ultrahigh molecular weight polyethylene (UHMWPE) films due to gamma... more Modifications taking place in ultrahigh molecular weight polyethylene (UHMWPE) films due to gamma ray radiation-induced and investigated in correlation with the applied doses. Films were irradiated in a vacuum at room temperature by a 1.25 MeV Co60 a source with doses ranging from 0 to 300 kGg. The optical, chemical, structural, and surface morphological properties of the irradiated and unirradiated UHMWPE films were investigated by UV-Visible, FTIR, XRD, and SEM, respectively. The band gap E g decreases with increasing radiation dose and coloration effects have been seen at higher doses. FTIR spectra show an oscillatory behavior in the transmittance intensities without affecting in their peak positions. Number of small absorption peaks can be seen clearly which may be due to the cross-linking of the polymeric chain. No significant change in crystalline peak has been found in the X-ray diffraction pattern indicating the structural stability of the polymer. The morphology of the smoo...

Nucl Instrum Meth Phys Res B, 2009

The radiation induced changes taking place in α-phased poly(vinylidene fluoride) (PVDF) films exp... more The radiation induced changes taking place in α-phased poly(vinylidene fluoride) (PVDF) films exposed to gamma rays were investigated in correlation with the applied doses. Samples were irradiated in vacuum at room temperature by a 1.25 MeV Co60 source with the doses in the range of 0–300 kGy. Optical and chemical properties of the irradiated as well as un-irradiated PVDF films were studied using UV–visible and FTIR techniques. Gamma irradiation was found to induce changes vary depending on the radiation dose.

Nucl Instrum Meth Phys Res B, 2009

The radiation induced changes taking place in α-phased poly(vinylidene fluoride) (PVDF) films exp... more The radiation induced changes taking place in α-phased poly(vinylidene fluoride) (PVDF) films exposed to gamma rays were investigated in correlation with the applied doses. Samples were irradiated in vacuum at room temperature by a 1.25 MeV Co 60 source with the doses in the range of 0-300 kGy. Optical and chemical properties of the irradiated as well as un-irradiated PVDF films were studied using UV-visible and FTIR techniques. Gamma irradiation was found to induce changes vary depending on the radiation dose.

Indian Journal of Pure and Applied Physics

In the present paper, the physico-chemical changes induced by 70 MeV carbon ions (12C+5) have bee... more In the present paper, the physico-chemical changes induced by 70 MeV carbon ions (12C+5) have been investigated in PVDF using UV-Visible, FTIR, XRD and HFIA techniques. The induced changes have been studied with respect to their optical, chemical, structural and electrical response. The polymer samples have been irradiated in the ion fluence ranging from 11011 to 31012 ions cm-2. The UV-visible spectra show that the optical absorption increases with increasing ion fluence. Two new dips at 482 nm and 654 nm were appeared in the irradiated sample which may be due to the fluorinated defects created due to irradiation. In the FTIR spectra, it was found that transmittance intensity decreases with increasing ion fluence in the range 1500-4000 cm-1. The diffraction pattern of PVDF indicates that crystallinity decreases with increasing ion fluence but the crystallite size is found to increase due to carbon ion irradiation. The variation of dielectric constant and dielectric loss for virgin ...

Advanced Materials Research, 2011

Abstract The structural and optical properties of virgin and gamma rays irradiation on aromatic p... more Abstract The structural and optical properties of virgin and gamma rays irradiation on aromatic polymers (PET, PES and Kapton) at various doses varying from 16 to 300kGy. The optical and Structural studies have been observed by using UV-VIS Spectroscopy and ...

Radiation Physics and Chemistry, 2012

... Siddhartha a , Suveda Aarya a , Kapil Dev b , Suresh Kumar Raghuvanshi a , JBM Krishna c , MA... more ... Siddhartha a , Suveda Aarya a , Kapil Dev b , Suresh Kumar Raghuvanshi a , JBM Krishna c , MA Wahab a , Corresponding Author Contact ... The authors are thankful to Dr. AK Sinha, Director of UGC – DAE Consortium for Scientific Research, Kolkata Centre for providing us the ...

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2009

The radiation induced changes taking place in alpha-phased poly(vinylidene fluoride) (PVDF) films... more The radiation induced changes taking place in alpha-phased poly(vinylidene fluoride) (PVDF) films exposed to gamma rays were investigated in correlation with the applied doses. Samples were irradiated in vacuum at room temperature by a 1.25 MeV Co60 source with the doses in the range of 0-300 kGy. Optical and chemical properties of the irradiated as well as un-irradiated PVDF films were studied using UV-visible and FTIR techniques. Gamma irradiation was found to induce changes vary depending on the radiation dose.

Journal of Applied Polymer Science, 2011

... 19. Tanu, S.; Aggarwal, S.; Kumar, S.; Mittal, VK; Kalsi, PC; Manchanda, VK J Mater Sci 2007,... more ... 19. Tanu, S.; Aggarwal, S.; Kumar, S.; Mittal, VK; Kalsi, PC; Manchanda, VK J Mater Sci 2007, 42, 1127. 20. Robertson, J.; O'Reilly, EP Phys Rev B 1987, 35, 2946. 21. Fink, D.; Klett, R.; Chadderton, LT Nucl Instum Methods Phys Res Sect B 1996, 303, 111. 22. ...

Journal of Applied Polymer Science, 2012

The structural, optical, and morphological properties of Co 60 c irradiation on poly(ethylene ter... more The structural, optical, and morphological properties of Co 60 c irradiation on poly(ethylene terephthalate) polymer samples were studied with X-ray diffraction (XRD), ultraviolet-visible spectroscopy, scanning electron microscopy (SEM), and Raman spectroscopy. The diffraction pattern of virgin sample showed that the polymer was semicrystalline in nature. However, because of irradiation, the crystallinity decreased up to a dose level of 110 kGy and increased up to 300 kGy. The crystallite size, strain, and dislocation were calculated from the XRD data, and the crystallite size decreased from 291.07 to 346.90 Å . The absorption edge shifted from 315 to 330 nm, and the band gap of the samples decreased from 3.79 to 3.66 eV. The SEM micrographs showed radial bulging along with inhomogeneous liner exfoliation, and also, a rocky shape pattern with different sizes was observed. A significant change was found in the Raman spectra of the c-irradiated polymer at the highest dose. The results of the structural, optical, and morphological studies show recovery characteristics at the highest dose level of 300 kGy. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 000: 000-000, 2012

Nanoscience and Nanotechnology Letters

The solid state syntheses of cubic Zinc Telluride nanoparticles were successesfully achieved for ... more The solid state syntheses of cubic Zinc Telluride nanoparticles were successesfully achieved for the first time by microwave irradiation technique within ∼25 min as per the author’s knowledge. The crystalline phase was confirmed by powder X-ray diffraction. The crystallite size was calculated and found to be ∼40 nm. Scanning electron microscope was also used to determine the size and shape of the nanoparticles, and the average particle size was found to be ∼60 nm with spherical shapes. The particle size distribution was in range of ∼50 to 70 nm. One transverse optic (TO) and two longitudinal optic (1LO and 2LO) phonon modes were observed at 167 and 205, 408 cm−1 in the FT-Raman spectrum. The optical band gap was calculated which has found to be 2.51 eV higher than the bulk ZnTe (Eg = 2�26 eV), it reveals a clear blue shift with an energy difference 0.25 eV, this may be due to the crystallite size, exciton or charge carrier confinement.

Advances in Polymer Technology

Modifications taking place in ultrahigh molecular weight polyethylene (UHMWPE) films due to gamma... more Modifications taking place in ultrahigh molecular weight polyethylene (UHMWPE) films due to gamma ray radiation-induced and investigated in correlation with the applied doses. Films were irradiated in a vacuum at room temperature by a 1.25 MeV Co60 a source with doses ranging from 0 to 300 kGg. The optical, chemical, structural, and surface morphological properties of the irradiated and unirradiated UHMWPE films were investigated by UV-Visible, FTIR, XRD, and SEM, respectively. The band gap E g decreases with increasing radiation dose and coloration effects have been seen at higher doses. FTIR spectra show an oscillatory behavior in the transmittance intensities without affecting in their peak positions. Number of small absorption peaks can be seen clearly which may be due to the cross-linking of the polymeric chain. No significant change in crystalline peak has been found in the X-ray diffraction pattern indicating the structural stability of the polymer. The morphology of the smoo...

Nucl Instrum Meth Phys Res B, 2009

The radiation induced changes taking place in α-phased poly(vinylidene fluoride) (PVDF) films exp... more The radiation induced changes taking place in α-phased poly(vinylidene fluoride) (PVDF) films exposed to gamma rays were investigated in correlation with the applied doses. Samples were irradiated in vacuum at room temperature by a 1.25 MeV Co60 source with the doses in the range of 0–300 kGy. Optical and chemical properties of the irradiated as well as un-irradiated PVDF films were studied using UV–visible and FTIR techniques. Gamma irradiation was found to induce changes vary depending on the radiation dose.

Nucl Instrum Meth Phys Res B, 2009

The radiation induced changes taking place in α-phased poly(vinylidene fluoride) (PVDF) films exp... more The radiation induced changes taking place in α-phased poly(vinylidene fluoride) (PVDF) films exposed to gamma rays were investigated in correlation with the applied doses. Samples were irradiated in vacuum at room temperature by a 1.25 MeV Co 60 source with the doses in the range of 0-300 kGy. Optical and chemical properties of the irradiated as well as un-irradiated PVDF films were studied using UV-visible and FTIR techniques. Gamma irradiation was found to induce changes vary depending on the radiation dose.

Indian Journal of Pure and Applied Physics

In the present paper, the physico-chemical changes induced by 70 MeV carbon ions (12C+5) have bee... more In the present paper, the physico-chemical changes induced by 70 MeV carbon ions (12C+5) have been investigated in PVDF using UV-Visible, FTIR, XRD and HFIA techniques. The induced changes have been studied with respect to their optical, chemical, structural and electrical response. The polymer samples have been irradiated in the ion fluence ranging from 11011 to 31012 ions cm-2. The UV-visible spectra show that the optical absorption increases with increasing ion fluence. Two new dips at 482 nm and 654 nm were appeared in the irradiated sample which may be due to the fluorinated defects created due to irradiation. In the FTIR spectra, it was found that transmittance intensity decreases with increasing ion fluence in the range 1500-4000 cm-1. The diffraction pattern of PVDF indicates that crystallinity decreases with increasing ion fluence but the crystallite size is found to increase due to carbon ion irradiation. The variation of dielectric constant and dielectric loss for virgin ...

Advanced Materials Research, 2011

Abstract The structural and optical properties of virgin and gamma rays irradiation on aromatic p... more Abstract The structural and optical properties of virgin and gamma rays irradiation on aromatic polymers (PET, PES and Kapton) at various doses varying from 16 to 300kGy. The optical and Structural studies have been observed by using UV-VIS Spectroscopy and ...

Radiation Physics and Chemistry, 2012

... Siddhartha a , Suveda Aarya a , Kapil Dev b , Suresh Kumar Raghuvanshi a , JBM Krishna c , MA... more ... Siddhartha a , Suveda Aarya a , Kapil Dev b , Suresh Kumar Raghuvanshi a , JBM Krishna c , MA Wahab a , Corresponding Author Contact ... The authors are thankful to Dr. AK Sinha, Director of UGC – DAE Consortium for Scientific Research, Kolkata Centre for providing us the ...

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2009

The radiation induced changes taking place in alpha-phased poly(vinylidene fluoride) (PVDF) films... more The radiation induced changes taking place in alpha-phased poly(vinylidene fluoride) (PVDF) films exposed to gamma rays were investigated in correlation with the applied doses. Samples were irradiated in vacuum at room temperature by a 1.25 MeV Co60 source with the doses in the range of 0-300 kGy. Optical and chemical properties of the irradiated as well as un-irradiated PVDF films were studied using UV-visible and FTIR techniques. Gamma irradiation was found to induce changes vary depending on the radiation dose.

Journal of Applied Polymer Science, 2011

... 19. Tanu, S.; Aggarwal, S.; Kumar, S.; Mittal, VK; Kalsi, PC; Manchanda, VK J Mater Sci 2007,... more ... 19. Tanu, S.; Aggarwal, S.; Kumar, S.; Mittal, VK; Kalsi, PC; Manchanda, VK J Mater Sci 2007, 42, 1127. 20. Robertson, J.; O'Reilly, EP Phys Rev B 1987, 35, 2946. 21. Fink, D.; Klett, R.; Chadderton, LT Nucl Instum Methods Phys Res Sect B 1996, 303, 111. 22. ...

Journal of Applied Polymer Science, 2012

The structural, optical, and morphological properties of Co 60 c irradiation on poly(ethylene ter... more The structural, optical, and morphological properties of Co 60 c irradiation on poly(ethylene terephthalate) polymer samples were studied with X-ray diffraction (XRD), ultraviolet-visible spectroscopy, scanning electron microscopy (SEM), and Raman spectroscopy. The diffraction pattern of virgin sample showed that the polymer was semicrystalline in nature. However, because of irradiation, the crystallinity decreased up to a dose level of 110 kGy and increased up to 300 kGy. The crystallite size, strain, and dislocation were calculated from the XRD data, and the crystallite size decreased from 291.07 to 346.90 Å . The absorption edge shifted from 315 to 330 nm, and the band gap of the samples decreased from 3.79 to 3.66 eV. The SEM micrographs showed radial bulging along with inhomogeneous liner exfoliation, and also, a rocky shape pattern with different sizes was observed. A significant change was found in the Raman spectra of the c-irradiated polymer at the highest dose. The results of the structural, optical, and morphological studies show recovery characteristics at the highest dose level of 300 kGy. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 000: 000-000, 2012

Nanoscience and Nanotechnology Letters

The solid state syntheses of cubic Zinc Telluride nanoparticles were successesfully achieved for ... more The solid state syntheses of cubic Zinc Telluride nanoparticles were successesfully achieved for the first time by microwave irradiation technique within ∼25 min as per the author’s knowledge. The crystalline phase was confirmed by powder X-ray diffraction. The crystallite size was calculated and found to be ∼40 nm. Scanning electron microscope was also used to determine the size and shape of the nanoparticles, and the average particle size was found to be ∼60 nm with spherical shapes. The particle size distribution was in range of ∼50 to 70 nm. One transverse optic (TO) and two longitudinal optic (1LO and 2LO) phonon modes were observed at 167 and 205, 408 cm−1 in the FT-Raman spectrum. The optical band gap was calculated which has found to be 2.51 eV higher than the bulk ZnTe (Eg = 2�26 eV), it reveals a clear blue shift with an energy difference 0.25 eV, this may be due to the crystallite size, exciton or charge carrier confinement.