The Experts below are selected from a list of 5991 Experts worldwide ranked by ideXlab platform
Venugopal Rao Soma - One of the best experts on this subject based on the ideXlab platform.
-
ag au nanoparticle loaded paper based versatile surface enhanced raman spectroscopy substrates for multiple Explosives Detection
ACS omega, 2018Co-Authors: Sree Satya Bharati Moram, Chandu Byram, Sini Nanadath Shibu, Bindu Madhuri Chilukamarri, Venugopal Rao SomaAbstract:We present a systematic study on the fabrication, characterization of versatile, and low-cost filter paper-based surface-enhanced Raman spectroscopy (SERS) substrates loaded with salt-induced aggregated Ag/Au nanoparticles (NPs). These were demonstrated as efficient SERS substrates for the Detection of multiple explosive molecules such as picric acid (5 μM), 2,4-dinitrotoluene (1 μM), and 3-nitro-1,2,4-triazol-5-one (10 μM) along with a common dye molecule (methylene blue, 5 nM). The concentrations of the dye and explosive molecules in terms of mass represent 31.98 pg, 11.45 ng, 1.82 ng, and 13.06 ng, respectively. Silver (Ag) and gold (Au) colloidal NPs were prepared by femtosecond laser (∼50 fs, 800 nm, 1 kHz) ablation of Ag/Au-target immersed in distilled water. Subsequently, the aggregated nanoparticles were achieved by mixing the pure Ag and Au NPs with different concentrations of NaCl. These aggregated NPs were characterized by UV-visible absorption and high-resolution transmission electron microscopy techniques. The SERS substrates were prepared by soaking the filter paper in aggregated NPs. The morphologies of the paper substrates were investigated using field-emission scanning electron microscopy technique. We have achieved superior enhancements with high reproducibility and sensitivity for filter paper substrates loaded with Ag/Au NPs mixed for an optimum concentration of 50 mM NaCl.
-
Ag/Au Nanoparticle-Loaded Paper-Based Versatile Surface-Enhanced Raman Spectroscopy Substrates for Multiple Explosives Detection
2018Co-Authors: Sree Satya Bharati Moram, Chandu Byram, Sini Nanadath Shibu, Bindu Madhuri Chilukamarri, Venugopal Rao SomaAbstract:We present a systematic study on the fabrication, characterization of versatile, and low-cost filter paper-based surface-enhanced Raman spectroscopy (SERS) substrates loaded with salt-induced aggregated Ag/Au nanoparticles (NPs). These were demonstrated as efficient SERS substrates for the Detection of multiple explosive molecules such as picric acid (5 μM), 2,4-dinitrotoluene (1 μM), and 3-nitro-1,2,4-triazol-5-one (10 μM) along with a common dye molecule (methylene blue, 5 nM). The concentrations of the dye and explosive molecules in terms of mass represent 31.98 pg, 11.45 ng, 1.82 ng, and 13.06 ng, respectively. Silver (Ag) and gold (Au) colloidal NPs were prepared by femtosecond laser (∼50 fs, 800 nm, 1 kHz) ablation of Ag/Au-target immersed in distilled water. Subsequently, the aggregated nanoparticles were achieved by mixing the pure Ag and Au NPs with different concentrations of NaCl. These aggregated NPs were characterized by UV–visible absorption and high-resolution transmission electron microscopy techniques. The SERS substrates were prepared by soaking the filter paper in aggregated NPs. The morphologies of the paper substrates were investigated using field-emission scanning electron microscopy technique. We have achieved superior enhancements with high reproducibility and sensitivity for filter paper substrates loaded with Ag/Au NPs mixed for an optimum concentration of 50 mM NaCl
-
cost effective nanostructured copper substrates prepared with ultrafast laser pulses for Explosives Detection using surface enhanced raman scattering
Applied Physics Letters, 2014Co-Authors: Syed Hamad, Krishna G Podagatlapalli, Md Ahamad Mohiddon, Venugopal Rao SomaAbstract:Ultrafast laser pulses induced surface nanostructures were fabricated on a copper (Cu) target through ablation in acetone, dichloromethane, acetonitrile, and chloroform. Surface morphological information accomplished from the field emission scanning electron microscopic data demonstrated the diversities of ablation mechanism in each case. Fabricated Cu substrates were utilized exultantly to investigate the surface plasmon (localized and propagating) mediated enhancements of different analytes using surface enhance Raman scattering (SERS) studies. Multiple utility of these substrates were efficiently demonstrated by collecting the SERS data of Rhodamine 6G molecule and two different secondary explosive molecules such as 5-amino-3-nitro-l,2,4-triazole and trinitrotoluene on different days which were weeks apart. We achieved significant enhancement factors of >105 through an easily adoptable cleaning procedure.
Jeffrey F Rhoads - One of the best experts on this subject based on the ideXlab platform.
-
heat generation in an elastic binder system with embedded discrete energetic particles due to high frequency periodic mechanical excitation
Journal of Applied Physics, 2014Co-Authors: Jesus O Mares, Jacob K Miller, I E Gunduz, Jeffrey F Rhoads, Steven F SonAbstract:High-frequency mechanical excitation can induce heating within energetic materials and may lead to advances in Explosives Detection and defeat. In order to examine the nature of this mechanically induced heating, samples of an elastic binder (Sylgard 184) were embedded with inert and energetic particles placed in a fixed spatial pattern and were subsequently excited with an ultrasonic transducer at discrete frequencies from 100 kHz to 20 MHz. The temperature and velocity responses of the sample surfaces suggest that heating due to frictional effects occurred near the particles at excitation frequencies near the transducer resonance of 215 kHz. An analytical solution involving a heat point source was used to estimate heating rates and temperatures at the particle locations in this frequency region. Heating located near the sample surface at frequencies near and above 1 MHz was attributed to viscoelastic effects related to the surface motion of the samples. At elevated excitation parameters near the transducer resonance frequency, embedded particles of ammonium perchlorate and cyclotetramethylene-tetranitramine were driven to chemical decomposition.
-
heat generation in an elastic binder system with embedded discrete energetic particles due to high frequency periodic mechanical excitation
Journal of Applied Physics, 2014Co-Authors: Jesus O Mares, Jacob K Miller, I E Gunduz, Jeffrey F RhoadsAbstract:High-frequency mechanical excitation can induce heating within energetic materials and may lead to advances in Explosives Detection and defeat. In order to examine the nature of this mechanically induced heating, samples of an elastic binder (Sylgard 184) were embedded with inert and energetic particles placed in a fixed spatial pattern and were subsequently excited with an ultrasonic transducer at discrete frequencies from 100 kHz to 20 MHz. The temperature and velocity responses of the sample surfaces suggest that heating due to frictional effects occurred near the particles at excitation frequencies near the transducer resonance of 215 kHz. An analytical solution involving a heat point source was used to estimate heating rates and temperatures at the particle locations in this frequency region. Heating located near the sample surface at frequencies near and above 1 MHz was attributed to viscoelastic effects related to the surface motion of the samples. At elevated excitation parameters near the transdu...
Jesus O Mares - One of the best experts on this subject based on the ideXlab platform.
-
heat generation in an elastic binder system with embedded discrete energetic particles due to high frequency periodic mechanical excitation
Journal of Applied Physics, 2014Co-Authors: Jesus O Mares, Jacob K Miller, I E Gunduz, Jeffrey F Rhoads, Steven F SonAbstract:High-frequency mechanical excitation can induce heating within energetic materials and may lead to advances in Explosives Detection and defeat. In order to examine the nature of this mechanically induced heating, samples of an elastic binder (Sylgard 184) were embedded with inert and energetic particles placed in a fixed spatial pattern and were subsequently excited with an ultrasonic transducer at discrete frequencies from 100 kHz to 20 MHz. The temperature and velocity responses of the sample surfaces suggest that heating due to frictional effects occurred near the particles at excitation frequencies near the transducer resonance of 215 kHz. An analytical solution involving a heat point source was used to estimate heating rates and temperatures at the particle locations in this frequency region. Heating located near the sample surface at frequencies near and above 1 MHz was attributed to viscoelastic effects related to the surface motion of the samples. At elevated excitation parameters near the transducer resonance frequency, embedded particles of ammonium perchlorate and cyclotetramethylene-tetranitramine were driven to chemical decomposition.
-
heat generation in an elastic binder system with embedded discrete energetic particles due to high frequency periodic mechanical excitation
Journal of Applied Physics, 2014Co-Authors: Jesus O Mares, Jacob K Miller, I E Gunduz, Jeffrey F RhoadsAbstract:High-frequency mechanical excitation can induce heating within energetic materials and may lead to advances in Explosives Detection and defeat. In order to examine the nature of this mechanically induced heating, samples of an elastic binder (Sylgard 184) were embedded with inert and energetic particles placed in a fixed spatial pattern and were subsequently excited with an ultrasonic transducer at discrete frequencies from 100 kHz to 20 MHz. The temperature and velocity responses of the sample surfaces suggest that heating due to frictional effects occurred near the particles at excitation frequencies near the transducer resonance of 215 kHz. An analytical solution involving a heat point source was used to estimate heating rates and temperatures at the particle locations in this frequency region. Heating located near the sample surface at frequencies near and above 1 MHz was attributed to viscoelastic effects related to the surface motion of the samples. At elevated excitation parameters near the transdu...
Steven F Son - One of the best experts on this subject based on the ideXlab platform.
-
heat generation in an elastic binder system with embedded discrete energetic particles due to high frequency periodic mechanical excitation
Journal of Applied Physics, 2014Co-Authors: Jesus O Mares, Jacob K Miller, I E Gunduz, Jeffrey F Rhoads, Steven F SonAbstract:High-frequency mechanical excitation can induce heating within energetic materials and may lead to advances in Explosives Detection and defeat. In order to examine the nature of this mechanically induced heating, samples of an elastic binder (Sylgard 184) were embedded with inert and energetic particles placed in a fixed spatial pattern and were subsequently excited with an ultrasonic transducer at discrete frequencies from 100 kHz to 20 MHz. The temperature and velocity responses of the sample surfaces suggest that heating due to frictional effects occurred near the particles at excitation frequencies near the transducer resonance of 215 kHz. An analytical solution involving a heat point source was used to estimate heating rates and temperatures at the particle locations in this frequency region. Heating located near the sample surface at frequencies near and above 1 MHz was attributed to viscoelastic effects related to the surface motion of the samples. At elevated excitation parameters near the transducer resonance frequency, embedded particles of ammonium perchlorate and cyclotetramethylene-tetranitramine were driven to chemical decomposition.
Jacob K Miller - One of the best experts on this subject based on the ideXlab platform.
-
heat generation in an elastic binder system with embedded discrete energetic particles due to high frequency periodic mechanical excitation
Journal of Applied Physics, 2014Co-Authors: Jesus O Mares, Jacob K Miller, I E Gunduz, Jeffrey F Rhoads, Steven F SonAbstract:High-frequency mechanical excitation can induce heating within energetic materials and may lead to advances in Explosives Detection and defeat. In order to examine the nature of this mechanically induced heating, samples of an elastic binder (Sylgard 184) were embedded with inert and energetic particles placed in a fixed spatial pattern and were subsequently excited with an ultrasonic transducer at discrete frequencies from 100 kHz to 20 MHz. The temperature and velocity responses of the sample surfaces suggest that heating due to frictional effects occurred near the particles at excitation frequencies near the transducer resonance of 215 kHz. An analytical solution involving a heat point source was used to estimate heating rates and temperatures at the particle locations in this frequency region. Heating located near the sample surface at frequencies near and above 1 MHz was attributed to viscoelastic effects related to the surface motion of the samples. At elevated excitation parameters near the transducer resonance frequency, embedded particles of ammonium perchlorate and cyclotetramethylene-tetranitramine were driven to chemical decomposition.
-
heat generation in an elastic binder system with embedded discrete energetic particles due to high frequency periodic mechanical excitation
Journal of Applied Physics, 2014Co-Authors: Jesus O Mares, Jacob K Miller, I E Gunduz, Jeffrey F RhoadsAbstract:High-frequency mechanical excitation can induce heating within energetic materials and may lead to advances in Explosives Detection and defeat. In order to examine the nature of this mechanically induced heating, samples of an elastic binder (Sylgard 184) were embedded with inert and energetic particles placed in a fixed spatial pattern and were subsequently excited with an ultrasonic transducer at discrete frequencies from 100 kHz to 20 MHz. The temperature and velocity responses of the sample surfaces suggest that heating due to frictional effects occurred near the particles at excitation frequencies near the transducer resonance of 215 kHz. An analytical solution involving a heat point source was used to estimate heating rates and temperatures at the particle locations in this frequency region. Heating located near the sample surface at frequencies near and above 1 MHz was attributed to viscoelastic effects related to the surface motion of the samples. At elevated excitation parameters near the transdu...
