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Papers by Svitlana Trotsenko

Molecules

To investigate the utility of acrylic monomers from various plant oils in adhesives manufacturing... more To investigate the utility of acrylic monomers from various plant oils in adhesives manufacturing, 25–45 wt. % of high oleic soybean oil-based monomer (HOSBM) was copolymerized in a miniemulsion with commercially applied butyl acrylate (BA), methyl methacrylate (MMA), or styrene (St). The compositions of the resulting ternary latex copolymers were varied in terms of both “soft” (HOSBM, BA) and “rigid” (MMA or St) macromolecular fragments, while total monomer conversion and molecular weight of copolymers were determined after synthesis. For most latexes, results indicated the presence of lower and higher molecular weight fractions, which is beneficial for the material adhesive performance. To correlate surface properties and adhesive performance of HOSBM-based copolymer latexes, contact angle hysteresis (using water as a contact liquid) for each latex-substrate pair was first determined. The data showed that plant oil-based latexes exhibit a clear ability to spread and adhere once ap...

The present invention relates to a process for the preparation of nanolayers from graphene compri... more The present invention relates to a process for the preparation of nanolayers from graphene comprising the following steps: a) preparing a mixture of at least one graphite compound and at least one polymerisable medium to form at least one graphite compound intercalated with the polymerisable medium, b) polymerization of the dispersion prepared in step a) with exfoliation of the at least one intercalated graphite compound, and c) isolation of the nanolayers formed in step b) from graphene.

Applied Physics A, 2017

A sustainable approach to graphite exfoliation via in situ thermal polymerization of fish oil res... more A sustainable approach to graphite exfoliation via in situ thermal polymerization of fish oil results in the production of nanographite particles. The material was characterized by elemental analysis, transmission electron microscopy, and Raman spectroscopy. The thermal polymerization of fish oil was controlled by monitoring the viscosity and measuring the iodine number. The number of structural defects on the graphitic surface remained constant during the synthesis. The protocol leads to a hydrophobization of the nanographite surface. Immobilized polyoil islands create sterical hindrance and stabilize the nanographite particles in engineering polymers.

Polymer Testing

Abstract Enhancement of thermal properties of epoxy resins was achieved by incorporation of polyb... more Abstract Enhancement of thermal properties of epoxy resins was achieved by incorporation of polybenzimidazole (PBI) fibermats filled with carbon nanomaterials, prepared by the solution electrospinning technique. Different type of carbon nanostructures (carbon nanotubes, graphite flakes, graphene nanoplatelets and carbon black) were compared as fillers in polybenzimidazole fibers. The carbon-PBI-fibermats showed remarkable thermal transport properties and therefore, they were studied as thermal reinforcement material for epoxy composites. Mechanical and thermal properties of produced composites were evaluated and the effectiveness of different types of carbon fillers examined. Results showed that the produced carbon filled fibermats can be used effectively as a thermal reinforcing material in epoxy resins, offering several advantages.

Abstract The present paper investigates an experimental approach concerning the determination of ... more Abstract The present paper investigates an experimental approach concerning the determination of dynamic behavior and damage kinetics of composite materials based on multiwalled carbon nanotubes (MWCNTs), embedded in electrospun reactive nanofibers in the Taylor impact test. Different impact energies have been considered namely; 21J and 39J to investigate the composite response. Projectiles are manufactured from a commercial steel 2071 with a nominal diameter of 50 mm and 1600 g of weight. The projectile was fired against a composite specimen initially hooked on a cell effort by a compressed gas gun within the velocity of 5 m/s and 7 m/s. Three types of specimens are considered: (1) MAT1 (carbon fiber reinforced epoxy polymer composite), MAT2 (consists of MAT1 and electrospun Polybenzmideazole-Bismaleimide (PBI-BMI) nanofibermats between carbon fiber layers) and MAT3 (consists of MAT2, where PBI-BMI nanofibermats are reinforced with multiwalled carbon nanotubes (MWCNTs)). The effect of the MWCNTs on the dynamic properties of the composite structures was studied. Microscope observations reveal damage progressive, buckling and crush-front propagation during tests. Application of the PBI-BMI reactive nanofibermats reinforced with MWCNTs leads to damage prevention, reducing damage area in composite samples.

Die vorliegende Erfindung betrifft polymermodifizierte Kohlenstoffnanorohren, eine thermisch leit... more Die vorliegende Erfindung betrifft polymermodifizierte Kohlenstoffnanorohren, eine thermisch leitfahige Zusammensetzung umfassend mindestens eine kontinuierliche Metallphase und thermisch leitfahige Kohlenstoffnanorohren (CNT) sowie Verfahren zu deren Herstellung.

Engineering Reports

The building industry makes a great effort to reduce energy consumption. The use of nanotechnolog... more The building industry makes a great effort to reduce energy consumption. The use of nanotechnology is one of the approaches to surpassing the properties of conventional insulation materials. In this work, an industrial cost-effective method to manufacture highly porous materials with excellent thermal insulation properties is described. The materials are prepared from polystyrene recovered from the building sector and electrospun as nanofiber-based sheets. Varying electrospinning parameters allow controlling the morphology of the produced materials. The materials are obtained with differences in interfiber and inner-fiber porosity and morphology. The thermal conductivity of the freestanding and compressed materials is evaluated. Those differences affect the insulation performance: the materials with higher interfiber porosity show better thermal insulation in the freestanding state. An increase of the inner-fiber porosity leads to better insulation in the compressed samples. Insertion of carbon nanomaterials reduces the effects of the infrared Radiation. Nanofiber-based insulation materials from the recycled expanded polystyrene (EPS) show thermal conductivity values of 20 to 25 mW/mK (ie, 20% to 30% below the thermal conductivity of the commercial EPS). The effect of integrating polystyrene nanofiber sheets into conventional wall-building materials is also investigated in terms of thermal insulation. The nanofiber insulation sheets are sandwiched between two pieces of the building materials resulting in a drastic increase of the insulation effect. The materials have a great potential in using, for example, as thermal insulation for the restoration of historic buildings in the narrow central parts of the old towns.

Journal of Nanoscience and Nanotechnology

We determined the thermal properties of thermal interface materials (TIMs) based on carbon nanotu... more We determined the thermal properties of thermal interface materials (TIMs) based on carbon nanotubes (CNTs) and commercial TIMs. The thermal conductivity of different fillers such as CNTs, graphite, nano-diamond, metal, and metal oxide particles (copper and zinc oxide) at different concentrations were studied with a transient plane source technique. For measuring the thermal diffusivity with the Xenon flash method we constructed two novel sample holders and applied them for the measurement of pastes. An open CPU-heat sink setup was used to test interface materials under realistic conditions. Interesting results regarding to the paste composition according to filling content, particle size and viscosity could be obtained.

2011 27th Annual IEEE Semiconductor Thermal Measurement and Management Symposium, 2011

We developed innovative solutions for reaching high performance in carbon-nanotube-filled enginee... more We developed innovative solutions for reaching high performance in carbon-nanotube-filled engineering materials. Electrospinning was applied to improve the thermal conductivity in polymer composites via the alignment of nanotubes in a polymer matrix. Alignment was achieved by flow-confinement and charge-induced alignment during electrospinning. Additionally, the use of liquid crystal polymer as a matrix increased the degree of alignment leading to the remarkable increase of the thermal conductivity in composites by a factor 33. We developed the reduction from method to produce metal-matrix composites filled with carbon nanotubes. We were able to engineer the coefficient of thermal expansion (CTE) of the copper composite, for example 3 wt% of carbon nanotubes added to copper yielded CTEs comparable with ceramics and semiconductors. In situ thermal polymerization of natural oils (plant and fish) was applied to produce nanotubes-based thermal greases. This method creates novel, environmentally friendly thermal grease with excellent thermal conductivity (increased by a factor 12), that is easy to handle compound and to remove. Such thermal greases can be applied to surfaces by various methods, including screen printing, and demonstrate good thermal stability, reduced thermal expansion, and no pumping-out effect.

IOP Conference Series: Materials Science and Engineering, 2014

Multiwalled carbon nanotubes with their superb mechanical properties are an unique filler materia... more Multiwalled carbon nanotubes with their superb mechanical properties are an unique filler material for polymer composites. Here, we present an investigation of mechanical properties of electrospun Poly-(methyl-methacrylate) multiwalled carbon nanotubes composite nanofibers. The method of electrospinning was used to fabricate suspended individual Poly-(methyl-methacrylate) multiwalled carbon nanotubes nanofibers. In order to reinforce the nanofibers, different high concentration of multiwalled carbon nanotubes were used. Transmission electron microscopy measurements reveal a successful filling of the nanofibers. The different types of nanofibers were deposited at SiO2 substrates. Which were previously etched, to create trenches for bend tests. Followed by fixing the nanofiber with a focus ion beam platinum deposition at the trench edges. An atomic force microscopy was used to perform the mechanical nanofiber bending tests over trenches. The results were compared with pristine Poly-(methylmethacrylate) nanofibers to nanofibers with 15 weight% and 20 weight% multiwalled carbon nanotubes composite fibers. We observed that pristine nanofibers have Young's modulus of 136 MPa, while for composite nanofibers with 15 weight% have 2.65 GPa and with 20 weight% have 6.06 GPa (at room temperature and air ambiance). This corresponds to an increase of Young's modulus of 19 fold between the pristine nanofibers and the 15 weight% of mutliwalled carbon nanotubes filled nanofibers. Therefore the increase of the Young's modulus compared between the pristine and the 20 weight% MWCNT filled nanofibers corresponds to 45 fold.

IOP Conference Series: Materials Science and Engineering, 2014

We report observing a double broad Kondo-like zero bias conductance peak at low temperatures in i... more We report observing a double broad Kondo-like zero bias conductance peak at low temperatures in individual suspended electrospun nanofibers Poly(methyl methacrylate)multiwalled carbon nanotubes. This anomalous behavior is suppressed at higher temperatures. We attribute this to the existence of correlated double impurity system inside the nanofiber. From the results we calculate a Kondo-like temperature for the nanofiber to be ∼31.7-34K. This result is a mounting evidence for the quasi-one dimensional character of these nanofibers. This is a first example of behavior resembling Kondo behavior in nanofibers.

Applied Physics A, 2011

We studied the thermal transport properties of multi-walled carbon nanotubes (MWNTs) in polymer a... more We studied the thermal transport properties of multi-walled carbon nanotubes (MWNTs) in polymer and oil matrices. The thermal conductivity of the oils and polymers increased linearly when adding tubes. We observe a particularly high increase in the thermal diffusivity of carbon-nanotube-loaded liquid crystal polymers (6×10 −5 cm 2 /s wt%), which is due to a spontaneous alignment of the MWNTs. Carbon nanotubes increased the thermal conductivity of oil by a factor of three for 20 wt% loading. We found little or no dependence of the thermal enhancement on the specific flavor of multiwall nanotubes used in the composites. Carbon nanotubes are excellent nanoscale fillers for composites in thermal management application.

2011 27th Annual IEEE Semiconductor Thermal Measurement and Management Symposium, 2011

We developed innovative solutions for reaching high performance in carbon-nanotube-filled enginee... more We developed innovative solutions for reaching high performance in carbon-nanotube-filled engineering materials. Electrospinning was applied to improve the thermal conductivity in polymer composites via the alignment of nanotubes in a polymer matrix. Alignment was achieved by flow-confinement and charge-induced alignment during electrospinning. Additionally, the use of liquid crystal polymer as a matrix increased the degree of alignment leading to the remarkable increase of the thermal conductivity in composites by a factor 33. We developed the reduction from method to produce metal-matrix composites filled with carbon nanotubes. We were able to engineer the coefficient of thermal expansion (CTE) of the copper composite, for example 3 wt% of carbon nanotubes added to copper yielded CTEs comparable with ceramics and semiconductors. In situ thermal polymerization of natural oils (plant and fish) was applied to produce nanotubes-based thermal greases. This method creates novel, environmentally friendly thermal grease with excellent thermal conductivity (increased by a factor 12), that is easy to handle compound and to remove. Such thermal greases can be applied to surfaces by various methods, including screen printing, and demonstrate good thermal stability, reduced thermal expansion, and no pumping-out effect.

Molecules

To investigate the utility of acrylic monomers from various plant oils in adhesives manufacturing... more To investigate the utility of acrylic monomers from various plant oils in adhesives manufacturing, 25–45 wt. % of high oleic soybean oil-based monomer (HOSBM) was copolymerized in a miniemulsion with commercially applied butyl acrylate (BA), methyl methacrylate (MMA), or styrene (St). The compositions of the resulting ternary latex copolymers were varied in terms of both “soft” (HOSBM, BA) and “rigid” (MMA or St) macromolecular fragments, while total monomer conversion and molecular weight of copolymers were determined after synthesis. For most latexes, results indicated the presence of lower and higher molecular weight fractions, which is beneficial for the material adhesive performance. To correlate surface properties and adhesive performance of HOSBM-based copolymer latexes, contact angle hysteresis (using water as a contact liquid) for each latex-substrate pair was first determined. The data showed that plant oil-based latexes exhibit a clear ability to spread and adhere once ap...

The present invention relates to a process for the preparation of nanolayers from graphene compri... more The present invention relates to a process for the preparation of nanolayers from graphene comprising the following steps: a) preparing a mixture of at least one graphite compound and at least one polymerisable medium to form at least one graphite compound intercalated with the polymerisable medium, b) polymerization of the dispersion prepared in step a) with exfoliation of the at least one intercalated graphite compound, and c) isolation of the nanolayers formed in step b) from graphene.

Applied Physics A, 2017

A sustainable approach to graphite exfoliation via in situ thermal polymerization of fish oil res... more A sustainable approach to graphite exfoliation via in situ thermal polymerization of fish oil results in the production of nanographite particles. The material was characterized by elemental analysis, transmission electron microscopy, and Raman spectroscopy. The thermal polymerization of fish oil was controlled by monitoring the viscosity and measuring the iodine number. The number of structural defects on the graphitic surface remained constant during the synthesis. The protocol leads to a hydrophobization of the nanographite surface. Immobilized polyoil islands create sterical hindrance and stabilize the nanographite particles in engineering polymers.

Polymer Testing

Abstract Enhancement of thermal properties of epoxy resins was achieved by incorporation of polyb... more Abstract Enhancement of thermal properties of epoxy resins was achieved by incorporation of polybenzimidazole (PBI) fibermats filled with carbon nanomaterials, prepared by the solution electrospinning technique. Different type of carbon nanostructures (carbon nanotubes, graphite flakes, graphene nanoplatelets and carbon black) were compared as fillers in polybenzimidazole fibers. The carbon-PBI-fibermats showed remarkable thermal transport properties and therefore, they were studied as thermal reinforcement material for epoxy composites. Mechanical and thermal properties of produced composites were evaluated and the effectiveness of different types of carbon fillers examined. Results showed that the produced carbon filled fibermats can be used effectively as a thermal reinforcing material in epoxy resins, offering several advantages.

Abstract The present paper investigates an experimental approach concerning the determination of ... more Abstract The present paper investigates an experimental approach concerning the determination of dynamic behavior and damage kinetics of composite materials based on multiwalled carbon nanotubes (MWCNTs), embedded in electrospun reactive nanofibers in the Taylor impact test. Different impact energies have been considered namely; 21J and 39J to investigate the composite response. Projectiles are manufactured from a commercial steel 2071 with a nominal diameter of 50 mm and 1600 g of weight. The projectile was fired against a composite specimen initially hooked on a cell effort by a compressed gas gun within the velocity of 5 m/s and 7 m/s. Three types of specimens are considered: (1) MAT1 (carbon fiber reinforced epoxy polymer composite), MAT2 (consists of MAT1 and electrospun Polybenzmideazole-Bismaleimide (PBI-BMI) nanofibermats between carbon fiber layers) and MAT3 (consists of MAT2, where PBI-BMI nanofibermats are reinforced with multiwalled carbon nanotubes (MWCNTs)). The effect of the MWCNTs on the dynamic properties of the composite structures was studied. Microscope observations reveal damage progressive, buckling and crush-front propagation during tests. Application of the PBI-BMI reactive nanofibermats reinforced with MWCNTs leads to damage prevention, reducing damage area in composite samples.

Die vorliegende Erfindung betrifft polymermodifizierte Kohlenstoffnanorohren, eine thermisch leit... more Die vorliegende Erfindung betrifft polymermodifizierte Kohlenstoffnanorohren, eine thermisch leitfahige Zusammensetzung umfassend mindestens eine kontinuierliche Metallphase und thermisch leitfahige Kohlenstoffnanorohren (CNT) sowie Verfahren zu deren Herstellung.

Engineering Reports

The building industry makes a great effort to reduce energy consumption. The use of nanotechnolog... more The building industry makes a great effort to reduce energy consumption. The use of nanotechnology is one of the approaches to surpassing the properties of conventional insulation materials. In this work, an industrial cost-effective method to manufacture highly porous materials with excellent thermal insulation properties is described. The materials are prepared from polystyrene recovered from the building sector and electrospun as nanofiber-based sheets. Varying electrospinning parameters allow controlling the morphology of the produced materials. The materials are obtained with differences in interfiber and inner-fiber porosity and morphology. The thermal conductivity of the freestanding and compressed materials is evaluated. Those differences affect the insulation performance: the materials with higher interfiber porosity show better thermal insulation in the freestanding state. An increase of the inner-fiber porosity leads to better insulation in the compressed samples. Insertion of carbon nanomaterials reduces the effects of the infrared Radiation. Nanofiber-based insulation materials from the recycled expanded polystyrene (EPS) show thermal conductivity values of 20 to 25 mW/mK (ie, 20% to 30% below the thermal conductivity of the commercial EPS). The effect of integrating polystyrene nanofiber sheets into conventional wall-building materials is also investigated in terms of thermal insulation. The nanofiber insulation sheets are sandwiched between two pieces of the building materials resulting in a drastic increase of the insulation effect. The materials have a great potential in using, for example, as thermal insulation for the restoration of historic buildings in the narrow central parts of the old towns.

Journal of Nanoscience and Nanotechnology

We determined the thermal properties of thermal interface materials (TIMs) based on carbon nanotu... more We determined the thermal properties of thermal interface materials (TIMs) based on carbon nanotubes (CNTs) and commercial TIMs. The thermal conductivity of different fillers such as CNTs, graphite, nano-diamond, metal, and metal oxide particles (copper and zinc oxide) at different concentrations were studied with a transient plane source technique. For measuring the thermal diffusivity with the Xenon flash method we constructed two novel sample holders and applied them for the measurement of pastes. An open CPU-heat sink setup was used to test interface materials under realistic conditions. Interesting results regarding to the paste composition according to filling content, particle size and viscosity could be obtained.

2011 27th Annual IEEE Semiconductor Thermal Measurement and Management Symposium, 2011

We developed innovative solutions for reaching high performance in carbon-nanotube-filled enginee... more We developed innovative solutions for reaching high performance in carbon-nanotube-filled engineering materials. Electrospinning was applied to improve the thermal conductivity in polymer composites via the alignment of nanotubes in a polymer matrix. Alignment was achieved by flow-confinement and charge-induced alignment during electrospinning. Additionally, the use of liquid crystal polymer as a matrix increased the degree of alignment leading to the remarkable increase of the thermal conductivity in composites by a factor 33. We developed the reduction from method to produce metal-matrix composites filled with carbon nanotubes. We were able to engineer the coefficient of thermal expansion (CTE) of the copper composite, for example 3 wt% of carbon nanotubes added to copper yielded CTEs comparable with ceramics and semiconductors. In situ thermal polymerization of natural oils (plant and fish) was applied to produce nanotubes-based thermal greases. This method creates novel, environmentally friendly thermal grease with excellent thermal conductivity (increased by a factor 12), that is easy to handle compound and to remove. Such thermal greases can be applied to surfaces by various methods, including screen printing, and demonstrate good thermal stability, reduced thermal expansion, and no pumping-out effect.

IOP Conference Series: Materials Science and Engineering, 2014

Multiwalled carbon nanotubes with their superb mechanical properties are an unique filler materia... more Multiwalled carbon nanotubes with their superb mechanical properties are an unique filler material for polymer composites. Here, we present an investigation of mechanical properties of electrospun Poly-(methyl-methacrylate) multiwalled carbon nanotubes composite nanofibers. The method of electrospinning was used to fabricate suspended individual Poly-(methyl-methacrylate) multiwalled carbon nanotubes nanofibers. In order to reinforce the nanofibers, different high concentration of multiwalled carbon nanotubes were used. Transmission electron microscopy measurements reveal a successful filling of the nanofibers. The different types of nanofibers were deposited at SiO2 substrates. Which were previously etched, to create trenches for bend tests. Followed by fixing the nanofiber with a focus ion beam platinum deposition at the trench edges. An atomic force microscopy was used to perform the mechanical nanofiber bending tests over trenches. The results were compared with pristine Poly-(methylmethacrylate) nanofibers to nanofibers with 15 weight% and 20 weight% multiwalled carbon nanotubes composite fibers. We observed that pristine nanofibers have Young's modulus of 136 MPa, while for composite nanofibers with 15 weight% have 2.65 GPa and with 20 weight% have 6.06 GPa (at room temperature and air ambiance). This corresponds to an increase of Young's modulus of 19 fold between the pristine nanofibers and the 15 weight% of mutliwalled carbon nanotubes filled nanofibers. Therefore the increase of the Young's modulus compared between the pristine and the 20 weight% MWCNT filled nanofibers corresponds to 45 fold.

IOP Conference Series: Materials Science and Engineering, 2014

We report observing a double broad Kondo-like zero bias conductance peak at low temperatures in i... more We report observing a double broad Kondo-like zero bias conductance peak at low temperatures in individual suspended electrospun nanofibers Poly(methyl methacrylate)multiwalled carbon nanotubes. This anomalous behavior is suppressed at higher temperatures. We attribute this to the existence of correlated double impurity system inside the nanofiber. From the results we calculate a Kondo-like temperature for the nanofiber to be ∼31.7-34K. This result is a mounting evidence for the quasi-one dimensional character of these nanofibers. This is a first example of behavior resembling Kondo behavior in nanofibers.

Applied Physics A, 2011

We studied the thermal transport properties of multi-walled carbon nanotubes (MWNTs) in polymer a... more We studied the thermal transport properties of multi-walled carbon nanotubes (MWNTs) in polymer and oil matrices. The thermal conductivity of the oils and polymers increased linearly when adding tubes. We observe a particularly high increase in the thermal diffusivity of carbon-nanotube-loaded liquid crystal polymers (6×10 −5 cm 2 /s wt%), which is due to a spontaneous alignment of the MWNTs. Carbon nanotubes increased the thermal conductivity of oil by a factor of three for 20 wt% loading. We found little or no dependence of the thermal enhancement on the specific flavor of multiwall nanotubes used in the composites. Carbon nanotubes are excellent nanoscale fillers for composites in thermal management application.

2011 27th Annual IEEE Semiconductor Thermal Measurement and Management Symposium, 2011

We developed innovative solutions for reaching high performance in carbon-nanotube-filled enginee... more We developed innovative solutions for reaching high performance in carbon-nanotube-filled engineering materials. Electrospinning was applied to improve the thermal conductivity in polymer composites via the alignment of nanotubes in a polymer matrix. Alignment was achieved by flow-confinement and charge-induced alignment during electrospinning. Additionally, the use of liquid crystal polymer as a matrix increased the degree of alignment leading to the remarkable increase of the thermal conductivity in composites by a factor 33. We developed the reduction from method to produce metal-matrix composites filled with carbon nanotubes. We were able to engineer the coefficient of thermal expansion (CTE) of the copper composite, for example 3 wt% of carbon nanotubes added to copper yielded CTEs comparable with ceramics and semiconductors. In situ thermal polymerization of natural oils (plant and fish) was applied to produce nanotubes-based thermal greases. This method creates novel, environmentally friendly thermal grease with excellent thermal conductivity (increased by a factor 12), that is easy to handle compound and to remove. Such thermal greases can be applied to surfaces by various methods, including screen printing, and demonstrate good thermal stability, reduced thermal expansion, and no pumping-out effect.