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Papers by Olga Shenderova
Diamond and Related Materials, Nov 1, 2006
The focus of this work is to examine the effects nanoparticles, in particular nanodiamond, have o... more The focus of this work is to examine the effects nanoparticles, in particular nanodiamond, have on the heat transfer of fluids and polymer solids. Sample preparation techniques that provide suitable nanoparticle dispersion in both liquid and solid samples are discussed. Liquid suspensions are characterized by measuring particle size distributions and liquid viscosities; heat transfer properties are qualitatively compared via an ad-hoc thermal transport test setup. Polymer samples are visually characterized to ensure nanoparticle dispersion and thermal conductivity is measured using a flash lamp technique.
Tribology International, Mar 1, 2014
The tribological properties of evenly distributed and agglomerated nanodiamonds on steel contact ... more The tribological properties of evenly distributed and agglomerated nanodiamonds on steel contact surfaces were compared in ethylene glycol lubricated tests using a pin-on-disc tribometer with a steel counter ball. The nanodiamond distributions were studied on silicon and steel surfaces using scanning electron microscopy. Friction and wear decreasing effects were observed with both sprayed and agglomerated nanodiamonds. The average friction coefficient with pure ethylene glycol lubricated contacts decreased from 0.16 to 0.12 with agglomerated nanodiamonds when 100 N load was applied. A minimum for both disc wear rate (0.40 Â 10 À 6 mm 3 /Nm) and ball wear rate (0.29 Â 10 À 6 mm 3 /Nm) was observed with agglomerated nanodiamonds. One of the mechanisms of nanodiamond lubrication was observed to be the incorporation of nanodiamond particles in to the tribolayer.
Environmental science. Nano, 2020
The unique properties of NV centers in diamond nanoparticles enable selective identification with... more The unique properties of NV centers in diamond nanoparticles enable selective identification within organisms and other complex environmental matrices.
Doklady Biochemistry and Biophysics, Dec 1, 2007
Ferroelectrics, Apr 26, 2015
Diamond and Related Materials, Nov 1, 2006
In order to readily utilize nanodiamond (ND) particulates produced by detonation synthesis in man... more In order to readily utilize nanodiamond (ND) particulates produced by detonation synthesis in many nanotechnology applications, it is necessary to modify the surface chemistry and to separate the particles into a more narrow range of particle sizes. Surface functionalization and fractionalization are highly dependent upon the method of ND synthesis and purification. For example, when material purified through the use of strong liquid oxidizers is used to produce hydrosols, they are unstable and difficult to fractionalize. In this study we developed a method of preparation that overcomes these two barriers. ND powder previously purified with a mixture of sulfuric acid and chromic anhydride was treated as follows: annealed in air followed by dispersion in water using a high power sonicator and multi-step ultracentrifugation. This treatment resulted in stable hydrosols formed from the smallest particle-size fractions.
2018 IEEE International Ultrasonics Symposium (IUS), 2018
In this contribution we present extensive investigations of longitudinal high frequency ultrasoni... more In this contribution we present extensive investigations of longitudinal high frequency ultrasonic attenuation in various types of polymer composites with nanoinclusions: polyurea elastomers with MoS2 nanotubes, polyurethane with WS2 nanotubes, and polydimethysiloxane (PDMS)composites with onion-like carbons (OLC). The large ultrasonic attenuation maxima related to the glass transition as well as to the first order semicrystalline/ amorphous phase transition were observed in pure and doped composites. In all investigated composites with carbons and inorganic nanoinclusions the increase of ultrasonic attenuation was observed after illuminating samples by white light using optical waveguide.
Carbon, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Physica B: Condensed Matter, 2019
Abstract Recent advancements in high temperature rapid thermal annealing (RTA) of irradiated diam... more Abstract Recent advancements in high temperature rapid thermal annealing (RTA) of irradiated diamond particles has made possible the production of the particles with fluorescence based on complexes of nitrogen and vacancies in a broad range of colors: blue, green, red/NIR as well as their mixtures, depending on the temperature and irradiation fluence. Still, the production of fluorescent diamond particles suffers from fluorescence inhomogeneity among particles. The goal of the current study is improvement of the fluorescence uniformity among the treated particles. Experiments were performed using as-grown 40 μm in diameter type Ib synthetic diamond particulate assuming that nitrogen uniformity among the as-grown particles should be higher versus milled ones used in previous studies. Particles were irradiated under mild conditions with 1 MeV electrons to a fluence 3 × 1018 e/cm2 without overheating during irradiation which resulted in relatively uniform green fluorescence among particles treated via RTA at temperatures corresponding to H3 centers formation.
Carbon, 2018
Hip implants are often made from titanium or titanium-based alloys. However, wear during the oper... more Hip implants are often made from titanium or titanium-based alloys. However, wear during the operation inside the human body is a key source of implant failure and adverse health effects. We propose new insight on the lubrication of titanium components. Addition of small amounts (less than 0.2 wt%) of nanodiamonds (NDs) to simulated body fluid promotes a substantial improvement in friction (3 times reduction) and wear (up to 2 orders of magnitude wear reduction) behavior of the titanium surfaces. Interestingly, the amount of NDs needed for improvement of friction and wear characteristics is critically dependent on the applied loads. With higher contact loads, larger concentrations of NDs are needed for better friction and wear reduction. Analysis of the wear track formed during sliding indicates the formation of a carbon-rich tribolayer which improves tribological properties of the contacting surfaces. Our results suggest that the carbon layer is formed from the nanodiamonds embedding in the top layer of titanium.
The Journal of Physical Chemistry C, 2017
Highly nonlinear optical properties of nanocarbon materials make them perspective candidates for ... more Highly nonlinear optical properties of nanocarbon materials make them perspective candidates for saturable absorption (SA) applications-characterized by a short-term decrease of the optical medium absorption at high incident light intensity. The nonlinear optical properties and SA of aqueous suspensions of 5 nm detonation nanodiamonds (DNDs) have been studied by the z-scan technique under irradiation with nanosecond laser pulses at wavelengths of 532 and 1064 nm. The saturation intensity and nonlinear absorption coefficient describing the SA were obtained for concentrations of DND suspensions ranging between 0.5 to 5 wt%. It was concluded that the single-digit DND suspensions are suitable for optical limiting only at relatively high intensities of incident radiation, with saturation intensities of ~5.9 and 14.1 MW/cm 2 for 532 and 1064 nm incident excitation, respectively.
Thin Solid Films, 2016
A method for forming a carbon nanotube (CNT) reinforced copper (Cu) composite by an electrodeposi... more A method for forming a carbon nanotube (CNT) reinforced copper (Cu) composite by an electrodeposition process has been developed. Nanoscale diamond particles were introduced as a dispersing agent to prevent aggregation of carbon nanotubes while performing electrodeposition, or what is commonly referred to as electroplating. The technique involves co-deposition of Cu and CNTs in an electroplating process that uses both direct current and a sequence of forward and reverse pulses. Reverse pulse times were varied in order to examine parameters for dispersion of carbon nanotubes in the resultant composite material. Electrical resistivity, surface morphology, and composite structure were investigated using a probe station, scanning electron microscopy, and xray diffraction, respectively. Experimental results show carbon nanotubes can be dispersed uniformly in a Cu/CNT composite due to the role played by the nanodiamond particles in CNT de-aggregation. Direct current electrodeposition yields high deposition rates while reverse pulse electrodeposition is a slower process although necessary for providing a higher percentage of CNTs integrated into the composite.
Science and Applications, 2014
Nanoscience and Nanotechnology Letters, 2011
ABSTRACT Production of nanodiamond particles containing substitutional nitrogen is important for ... more ABSTRACT Production of nanodiamond particles containing substitutional nitrogen is important for a wide variety of advanced applications. In the current work nanodiamond particles synthesized from a mixture of graphite and hexogen were analyzed to determine the presence of substitutional nitrogen using pulsed electron paramagnetic resonance (EPR) spectroscopy. Nitrogen paramagnetic centers in the amount of 1.2 ppm have been identified. The spin relaxation characteristics for both nitrogen and surface defects are also reported. A new approach for efficient depletion of the strong non-nitrogen EPR signal in nanodiamond material by immersing nanodiamond particles into ice matrix is suggested. This approach allows an essential decrease of the spin relaxation time of the dominant non-nitrogen defects, while preserving the substitutional nitrogen spin relaxation time.
Electrical Engineering Handbook, 2012
Tribology International, 2014
The tribological properties of evenly distributed and agglomerated nanodiamonds on steel contact ... more The tribological properties of evenly distributed and agglomerated nanodiamonds on steel contact surfaces were compared in ethylene glycol lubricated tests using a pin-on-disc tribometer with a steel counter ball. The nanodiamond distributions were studied on silicon and steel surfaces using scanning electron microscopy. Friction and wear decreasing effects were observed with both sprayed and agglomerated nanodiamonds. The average friction coefficient with pure ethylene glycol lubricated contacts decreased from 0.16 to 0.12 with agglomerated nanodiamonds when 100 N load was applied. A minimum for both disc wear rate (0.40 Â 10 À 6 mm 3 /Nm) and ball wear rate (0.29 Â 10 À 6 mm 3 /Nm) was observed with agglomerated nanodiamonds. One of the mechanisms of nanodiamond lubrication was observed to be the incorporation of nanodiamond particles in to the tribolayer.
Electrical Engineering Handbook, 2002
Diamond and Related Materials, Nov 1, 2006
The focus of this work is to examine the effects nanoparticles, in particular nanodiamond, have o... more The focus of this work is to examine the effects nanoparticles, in particular nanodiamond, have on the heat transfer of fluids and polymer solids. Sample preparation techniques that provide suitable nanoparticle dispersion in both liquid and solid samples are discussed. Liquid suspensions are characterized by measuring particle size distributions and liquid viscosities; heat transfer properties are qualitatively compared via an ad-hoc thermal transport test setup. Polymer samples are visually characterized to ensure nanoparticle dispersion and thermal conductivity is measured using a flash lamp technique.
Tribology International, Mar 1, 2014
The tribological properties of evenly distributed and agglomerated nanodiamonds on steel contact ... more The tribological properties of evenly distributed and agglomerated nanodiamonds on steel contact surfaces were compared in ethylene glycol lubricated tests using a pin-on-disc tribometer with a steel counter ball. The nanodiamond distributions were studied on silicon and steel surfaces using scanning electron microscopy. Friction and wear decreasing effects were observed with both sprayed and agglomerated nanodiamonds. The average friction coefficient with pure ethylene glycol lubricated contacts decreased from 0.16 to 0.12 with agglomerated nanodiamonds when 100 N load was applied. A minimum for both disc wear rate (0.40 Â 10 À 6 mm 3 /Nm) and ball wear rate (0.29 Â 10 À 6 mm 3 /Nm) was observed with agglomerated nanodiamonds. One of the mechanisms of nanodiamond lubrication was observed to be the incorporation of nanodiamond particles in to the tribolayer.
Environmental science. Nano, 2020
The unique properties of NV centers in diamond nanoparticles enable selective identification with... more The unique properties of NV centers in diamond nanoparticles enable selective identification within organisms and other complex environmental matrices.
Doklady Biochemistry and Biophysics, Dec 1, 2007
Ferroelectrics, Apr 26, 2015
Diamond and Related Materials, Nov 1, 2006
In order to readily utilize nanodiamond (ND) particulates produced by detonation synthesis in man... more In order to readily utilize nanodiamond (ND) particulates produced by detonation synthesis in many nanotechnology applications, it is necessary to modify the surface chemistry and to separate the particles into a more narrow range of particle sizes. Surface functionalization and fractionalization are highly dependent upon the method of ND synthesis and purification. For example, when material purified through the use of strong liquid oxidizers is used to produce hydrosols, they are unstable and difficult to fractionalize. In this study we developed a method of preparation that overcomes these two barriers. ND powder previously purified with a mixture of sulfuric acid and chromic anhydride was treated as follows: annealed in air followed by dispersion in water using a high power sonicator and multi-step ultracentrifugation. This treatment resulted in stable hydrosols formed from the smallest particle-size fractions.
2018 IEEE International Ultrasonics Symposium (IUS), 2018
In this contribution we present extensive investigations of longitudinal high frequency ultrasoni... more In this contribution we present extensive investigations of longitudinal high frequency ultrasonic attenuation in various types of polymer composites with nanoinclusions: polyurea elastomers with MoS2 nanotubes, polyurethane with WS2 nanotubes, and polydimethysiloxane (PDMS)composites with onion-like carbons (OLC). The large ultrasonic attenuation maxima related to the glass transition as well as to the first order semicrystalline/ amorphous phase transition were observed in pure and doped composites. In all investigated composites with carbons and inorganic nanoinclusions the increase of ultrasonic attenuation was observed after illuminating samples by white light using optical waveguide.
Carbon, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Physica B: Condensed Matter, 2019
Abstract Recent advancements in high temperature rapid thermal annealing (RTA) of irradiated diam... more Abstract Recent advancements in high temperature rapid thermal annealing (RTA) of irradiated diamond particles has made possible the production of the particles with fluorescence based on complexes of nitrogen and vacancies in a broad range of colors: blue, green, red/NIR as well as their mixtures, depending on the temperature and irradiation fluence. Still, the production of fluorescent diamond particles suffers from fluorescence inhomogeneity among particles. The goal of the current study is improvement of the fluorescence uniformity among the treated particles. Experiments were performed using as-grown 40 μm in diameter type Ib synthetic diamond particulate assuming that nitrogen uniformity among the as-grown particles should be higher versus milled ones used in previous studies. Particles were irradiated under mild conditions with 1 MeV electrons to a fluence 3 × 1018 e/cm2 without overheating during irradiation which resulted in relatively uniform green fluorescence among particles treated via RTA at temperatures corresponding to H3 centers formation.
Carbon, 2018
Hip implants are often made from titanium or titanium-based alloys. However, wear during the oper... more Hip implants are often made from titanium or titanium-based alloys. However, wear during the operation inside the human body is a key source of implant failure and adverse health effects. We propose new insight on the lubrication of titanium components. Addition of small amounts (less than 0.2 wt%) of nanodiamonds (NDs) to simulated body fluid promotes a substantial improvement in friction (3 times reduction) and wear (up to 2 orders of magnitude wear reduction) behavior of the titanium surfaces. Interestingly, the amount of NDs needed for improvement of friction and wear characteristics is critically dependent on the applied loads. With higher contact loads, larger concentrations of NDs are needed for better friction and wear reduction. Analysis of the wear track formed during sliding indicates the formation of a carbon-rich tribolayer which improves tribological properties of the contacting surfaces. Our results suggest that the carbon layer is formed from the nanodiamonds embedding in the top layer of titanium.
The Journal of Physical Chemistry C, 2017
Highly nonlinear optical properties of nanocarbon materials make them perspective candidates for ... more Highly nonlinear optical properties of nanocarbon materials make them perspective candidates for saturable absorption (SA) applications-characterized by a short-term decrease of the optical medium absorption at high incident light intensity. The nonlinear optical properties and SA of aqueous suspensions of 5 nm detonation nanodiamonds (DNDs) have been studied by the z-scan technique under irradiation with nanosecond laser pulses at wavelengths of 532 and 1064 nm. The saturation intensity and nonlinear absorption coefficient describing the SA were obtained for concentrations of DND suspensions ranging between 0.5 to 5 wt%. It was concluded that the single-digit DND suspensions are suitable for optical limiting only at relatively high intensities of incident radiation, with saturation intensities of ~5.9 and 14.1 MW/cm 2 for 532 and 1064 nm incident excitation, respectively.
Thin Solid Films, 2016
A method for forming a carbon nanotube (CNT) reinforced copper (Cu) composite by an electrodeposi... more A method for forming a carbon nanotube (CNT) reinforced copper (Cu) composite by an electrodeposition process has been developed. Nanoscale diamond particles were introduced as a dispersing agent to prevent aggregation of carbon nanotubes while performing electrodeposition, or what is commonly referred to as electroplating. The technique involves co-deposition of Cu and CNTs in an electroplating process that uses both direct current and a sequence of forward and reverse pulses. Reverse pulse times were varied in order to examine parameters for dispersion of carbon nanotubes in the resultant composite material. Electrical resistivity, surface morphology, and composite structure were investigated using a probe station, scanning electron microscopy, and xray diffraction, respectively. Experimental results show carbon nanotubes can be dispersed uniformly in a Cu/CNT composite due to the role played by the nanodiamond particles in CNT de-aggregation. Direct current electrodeposition yields high deposition rates while reverse pulse electrodeposition is a slower process although necessary for providing a higher percentage of CNTs integrated into the composite.
Science and Applications, 2014
Nanoscience and Nanotechnology Letters, 2011
ABSTRACT Production of nanodiamond particles containing substitutional nitrogen is important for ... more ABSTRACT Production of nanodiamond particles containing substitutional nitrogen is important for a wide variety of advanced applications. In the current work nanodiamond particles synthesized from a mixture of graphite and hexogen were analyzed to determine the presence of substitutional nitrogen using pulsed electron paramagnetic resonance (EPR) spectroscopy. Nitrogen paramagnetic centers in the amount of 1.2 ppm have been identified. The spin relaxation characteristics for both nitrogen and surface defects are also reported. A new approach for efficient depletion of the strong non-nitrogen EPR signal in nanodiamond material by immersing nanodiamond particles into ice matrix is suggested. This approach allows an essential decrease of the spin relaxation time of the dominant non-nitrogen defects, while preserving the substitutional nitrogen spin relaxation time.
Electrical Engineering Handbook, 2012
Tribology International, 2014
The tribological properties of evenly distributed and agglomerated nanodiamonds on steel contact ... more The tribological properties of evenly distributed and agglomerated nanodiamonds on steel contact surfaces were compared in ethylene glycol lubricated tests using a pin-on-disc tribometer with a steel counter ball. The nanodiamond distributions were studied on silicon and steel surfaces using scanning electron microscopy. Friction and wear decreasing effects were observed with both sprayed and agglomerated nanodiamonds. The average friction coefficient with pure ethylene glycol lubricated contacts decreased from 0.16 to 0.12 with agglomerated nanodiamonds when 100 N load was applied. A minimum for both disc wear rate (0.40 Â 10 À 6 mm 3 /Nm) and ball wear rate (0.29 Â 10 À 6 mm 3 /Nm) was observed with agglomerated nanodiamonds. One of the mechanisms of nanodiamond lubrication was observed to be the incorporation of nanodiamond particles in to the tribolayer.
Electrical Engineering Handbook, 2002