The Experts below are selected from a list of 3048 Experts worldwide ranked by ideXlab platform
Igor Krupa - One of the best experts on this subject based on the ideXlab platform.
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recycled polyethylene paraffin wax Expanded Graphite based heat absorbers for thermal energy storage an artificial aging study
Molecules, 2019Co-Authors: Haneen Abdelrazeq, Patrik Sobolciak, Mariam Al Ali Almaadeed, Mabrouk Ouederni, Igor KrupaAbstract:An artificial aging study of novel heat absorbers based on phase change materials (PCMs) prepared from recycled high-density polyethylene (HDPE), paraffin wax (PW), and Expanded Graphite (EG) was investigated. The optimal composition of PCMs contained 40 wt% HDPE, whereas the paraffin wax content ranged from 40 to 60 wt% and the Expanded Graphite content ranged from 5 to 15 wt%. PCMs were artificially aged through exposure to UV irradiation, enhanced temperature, and humidity. It was clearly demonstrated that the addition of EG to PCMs led to the suppression of PW leakage and improved the photooxidation stability of the PCMs during the aging process. The best performance was achieved by adding 15 wt% of EG to the PCMs. The sample shows a leakage of paraffin wax below 10%, retaining a melting enthalpy of PW within PCMs of 54.8 J/g, a thermal conductivity of 1.64 W/mK and the lowest photooxidation, characterized by an increase in the concentration of carbonyl groups from all investigated materials after artificial aging. Furthermore, PCMs mixed with EG exhibited good mechanical properties, even after 100 days of exposure to artificial aging. Finally, this work demonstrates a justification for the use of recycled plastics in the formation of PCMs.
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Recycled Polyethylene/Paraffin Wax/Expanded Graphite Based Heat Absorbers for Thermal Energy Storage: An Artificial Aging Study
'MDPI AG', 2019Co-Authors: Haneen Abdelrazeq, Patrik Sobolciak, Mabrouk Ouederni, Mariam Al-ali Al-maadeed, Igor KrupaAbstract:An artificial aging study of novel heat absorbers based on phase change materials (PCMs) prepared from recycled high-density polyethylene (HDPE), paraffin wax (PW), and Expanded Graphite (EG) was investigated. The optimal composition of PCMs contained 40 wt% HDPE, whereas the paraffin wax content ranged from 40 to 60 wt% and the Expanded Graphite content ranged from 5 to 15 wt%. PCMs were artificially aged through exposure to UV irradiation, enhanced temperature, and humidity. It was clearly demonstrated that the addition of EG to PCMs led to the suppression of PW leakage and improved the photooxidation stability of the PCMs during the aging process. The best performance was achieved by adding 15 wt% of EG to the PCMs. The sample shows a leakage of paraffin wax below 10%, retaining a melting enthalpy of PW within PCMs of 54.8 J/g, a thermal conductivity of 1.64 W/mK and the lowest photooxidation, characterized by an increase in the concentration of carbonyl groups from all investigated materials after artificial aging. Furthermore, PCMs mixed with EG exhibited good mechanical properties, even after 100 days of exposure to artificial aging. Finally, this work demonstrates a justification for the use of recycled plastics in the formation of PCMs
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thermal characterization of phase change materials based on linear low density polyethylene paraffin wax and Expanded Graphite
Renewable Energy, 2016Co-Authors: Patrik Sobolciak, Mustapha Karkri, Mariam Al Ali Almaadeed, Igor KrupaAbstract:Thermal characterization of Phase Change Materials (PCMs) based on linear low-density polyethylene (LLDPE), paraffin wax (W) and Expanded Graphite (EG) is reported in this paper. Investigated PCMs showed high potential for application in energy storage systems.
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the stabilizing effect of Expanded Graphite on the artificial aging of shape stabilized phase change materials
Polymer Testing, 2015Co-Authors: Patrik Sobolciak, Mustapha Karkri, Mariam Al Ali Almaadeed, Haneen Abdelrazeq, Mabrouk Ouederni, Igor KrupaAbstract:Abstract Artificial aging of Shape Stabilized Phase Change Materials (SSPCM) based on linear low density polyethylene (LLDPE) and paraffin wax (W) modified with various amounts of Expanded Graphite (EG) was investigated and reported in this paper. It was found that EG not only strongly suppresses leakage of paraffin wax from the material over time but also significantly improves the photo oxidation stability. The increase in the melting point of wax incorporated within LLDPE matrix during aging was observed whereas the specific melting enthalpy of the paraffin wax decreased. This is mainly caused by the leakage of paraffin wax from the blends. The melting of neat LLDPE decreased during aging whereas its specific enthalpy of melting increased. Addition of EG led to the prolonged photo-oxidation stability of materials, as confirmed by Carbonyl Index measurements.
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positive influence of Expanded Graphite on the physical behavior of phase change materials based on linear low density polyethylene and paraffin wax
Thermochimica Acta, 2015Co-Authors: Igor Krupa, Patrik Sobolciak, Mustapha Karkri, Haneen Abdelrazeq, Mabrouk Ouederni, Zuzana Nogellova, Zdenko Spitalský, Marta Malikova, Ivica JanigovaAbstract:Abstract The preparation of Phase Change Materials (PCM) with improved thermal conductivity, based on linear low-density polyethylene (LLDPE), paraffin wax with a melting point of approximately 42 °C and Expanded Graphite as well as the investigation of their physical behavior is reported in this paper. The absorption of heat energy is realized by phase transitions in the wax structure, i.e., solid–solid transitions between different crystalline structures of wax and, primarily, by a solid–liquid transition. An estimate of the total heat energy that can be reversibly absorbed or released by the designed materials was determined using Differential Scanning Calorimetry (DSC). The improvement in the thermal conductivity of the polymeric materials was obtained by incorporating Expanded Graphite into the blends. Expanded Graphite has a reinforcing effect on the PCM, resulting in an increase in the toughness (Young’s modulus) Significant amounts of wax are leached from the samples, and a higher wax content also results in more wax leakage. Graphite significantly reduces the wax loss from the samples.
Patrik Sobolciak - One of the best experts on this subject based on the ideXlab platform.
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recycled polyethylene paraffin wax Expanded Graphite based heat absorbers for thermal energy storage an artificial aging study
Molecules, 2019Co-Authors: Haneen Abdelrazeq, Patrik Sobolciak, Mariam Al Ali Almaadeed, Mabrouk Ouederni, Igor KrupaAbstract:An artificial aging study of novel heat absorbers based on phase change materials (PCMs) prepared from recycled high-density polyethylene (HDPE), paraffin wax (PW), and Expanded Graphite (EG) was investigated. The optimal composition of PCMs contained 40 wt% HDPE, whereas the paraffin wax content ranged from 40 to 60 wt% and the Expanded Graphite content ranged from 5 to 15 wt%. PCMs were artificially aged through exposure to UV irradiation, enhanced temperature, and humidity. It was clearly demonstrated that the addition of EG to PCMs led to the suppression of PW leakage and improved the photooxidation stability of the PCMs during the aging process. The best performance was achieved by adding 15 wt% of EG to the PCMs. The sample shows a leakage of paraffin wax below 10%, retaining a melting enthalpy of PW within PCMs of 54.8 J/g, a thermal conductivity of 1.64 W/mK and the lowest photooxidation, characterized by an increase in the concentration of carbonyl groups from all investigated materials after artificial aging. Furthermore, PCMs mixed with EG exhibited good mechanical properties, even after 100 days of exposure to artificial aging. Finally, this work demonstrates a justification for the use of recycled plastics in the formation of PCMs.
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Recycled Polyethylene/Paraffin Wax/Expanded Graphite Based Heat Absorbers for Thermal Energy Storage: An Artificial Aging Study
'MDPI AG', 2019Co-Authors: Haneen Abdelrazeq, Patrik Sobolciak, Mabrouk Ouederni, Mariam Al-ali Al-maadeed, Igor KrupaAbstract:An artificial aging study of novel heat absorbers based on phase change materials (PCMs) prepared from recycled high-density polyethylene (HDPE), paraffin wax (PW), and Expanded Graphite (EG) was investigated. The optimal composition of PCMs contained 40 wt% HDPE, whereas the paraffin wax content ranged from 40 to 60 wt% and the Expanded Graphite content ranged from 5 to 15 wt%. PCMs were artificially aged through exposure to UV irradiation, enhanced temperature, and humidity. It was clearly demonstrated that the addition of EG to PCMs led to the suppression of PW leakage and improved the photooxidation stability of the PCMs during the aging process. The best performance was achieved by adding 15 wt% of EG to the PCMs. The sample shows a leakage of paraffin wax below 10%, retaining a melting enthalpy of PW within PCMs of 54.8 J/g, a thermal conductivity of 1.64 W/mK and the lowest photooxidation, characterized by an increase in the concentration of carbonyl groups from all investigated materials after artificial aging. Furthermore, PCMs mixed with EG exhibited good mechanical properties, even after 100 days of exposure to artificial aging. Finally, this work demonstrates a justification for the use of recycled plastics in the formation of PCMs
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thermal characterization of phase change materials based on linear low density polyethylene paraffin wax and Expanded Graphite
Renewable Energy, 2016Co-Authors: Patrik Sobolciak, Mustapha Karkri, Mariam Al Ali Almaadeed, Igor KrupaAbstract:Thermal characterization of Phase Change Materials (PCMs) based on linear low-density polyethylene (LLDPE), paraffin wax (W) and Expanded Graphite (EG) is reported in this paper. Investigated PCMs showed high potential for application in energy storage systems.
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the stabilizing effect of Expanded Graphite on the artificial aging of shape stabilized phase change materials
Polymer Testing, 2015Co-Authors: Patrik Sobolciak, Mustapha Karkri, Mariam Al Ali Almaadeed, Haneen Abdelrazeq, Mabrouk Ouederni, Igor KrupaAbstract:Abstract Artificial aging of Shape Stabilized Phase Change Materials (SSPCM) based on linear low density polyethylene (LLDPE) and paraffin wax (W) modified with various amounts of Expanded Graphite (EG) was investigated and reported in this paper. It was found that EG not only strongly suppresses leakage of paraffin wax from the material over time but also significantly improves the photo oxidation stability. The increase in the melting point of wax incorporated within LLDPE matrix during aging was observed whereas the specific melting enthalpy of the paraffin wax decreased. This is mainly caused by the leakage of paraffin wax from the blends. The melting of neat LLDPE decreased during aging whereas its specific enthalpy of melting increased. Addition of EG led to the prolonged photo-oxidation stability of materials, as confirmed by Carbonyl Index measurements.
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positive influence of Expanded Graphite on the physical behavior of phase change materials based on linear low density polyethylene and paraffin wax
Thermochimica Acta, 2015Co-Authors: Igor Krupa, Patrik Sobolciak, Mustapha Karkri, Haneen Abdelrazeq, Mabrouk Ouederni, Zuzana Nogellova, Zdenko Spitalský, Marta Malikova, Ivica JanigovaAbstract:Abstract The preparation of Phase Change Materials (PCM) with improved thermal conductivity, based on linear low-density polyethylene (LLDPE), paraffin wax with a melting point of approximately 42 °C and Expanded Graphite as well as the investigation of their physical behavior is reported in this paper. The absorption of heat energy is realized by phase transitions in the wax structure, i.e., solid–solid transitions between different crystalline structures of wax and, primarily, by a solid–liquid transition. An estimate of the total heat energy that can be reversibly absorbed or released by the designed materials was determined using Differential Scanning Calorimetry (DSC). The improvement in the thermal conductivity of the polymeric materials was obtained by incorporating Expanded Graphite into the blends. Expanded Graphite has a reinforcing effect on the PCM, resulting in an increase in the toughness (Young’s modulus) Significant amounts of wax are leached from the samples, and a higher wax content also results in more wax leakage. Graphite significantly reduces the wax loss from the samples.
Mariam Al Ali Almaadeed - One of the best experts on this subject based on the ideXlab platform.
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recycled polyethylene paraffin wax Expanded Graphite based heat absorbers for thermal energy storage an artificial aging study
Molecules, 2019Co-Authors: Haneen Abdelrazeq, Patrik Sobolciak, Mariam Al Ali Almaadeed, Mabrouk Ouederni, Igor KrupaAbstract:An artificial aging study of novel heat absorbers based on phase change materials (PCMs) prepared from recycled high-density polyethylene (HDPE), paraffin wax (PW), and Expanded Graphite (EG) was investigated. The optimal composition of PCMs contained 40 wt% HDPE, whereas the paraffin wax content ranged from 40 to 60 wt% and the Expanded Graphite content ranged from 5 to 15 wt%. PCMs were artificially aged through exposure to UV irradiation, enhanced temperature, and humidity. It was clearly demonstrated that the addition of EG to PCMs led to the suppression of PW leakage and improved the photooxidation stability of the PCMs during the aging process. The best performance was achieved by adding 15 wt% of EG to the PCMs. The sample shows a leakage of paraffin wax below 10%, retaining a melting enthalpy of PW within PCMs of 54.8 J/g, a thermal conductivity of 1.64 W/mK and the lowest photooxidation, characterized by an increase in the concentration of carbonyl groups from all investigated materials after artificial aging. Furthermore, PCMs mixed with EG exhibited good mechanical properties, even after 100 days of exposure to artificial aging. Finally, this work demonstrates a justification for the use of recycled plastics in the formation of PCMs.
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thermal characterization of phase change materials based on linear low density polyethylene paraffin wax and Expanded Graphite
Renewable Energy, 2016Co-Authors: Patrik Sobolciak, Mustapha Karkri, Mariam Al Ali Almaadeed, Igor KrupaAbstract:Thermal characterization of Phase Change Materials (PCMs) based on linear low-density polyethylene (LLDPE), paraffin wax (W) and Expanded Graphite (EG) is reported in this paper. Investigated PCMs showed high potential for application in energy storage systems.
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the stabilizing effect of Expanded Graphite on the artificial aging of shape stabilized phase change materials
Polymer Testing, 2015Co-Authors: Patrik Sobolciak, Mustapha Karkri, Mariam Al Ali Almaadeed, Haneen Abdelrazeq, Mabrouk Ouederni, Igor KrupaAbstract:Abstract Artificial aging of Shape Stabilized Phase Change Materials (SSPCM) based on linear low density polyethylene (LLDPE) and paraffin wax (W) modified with various amounts of Expanded Graphite (EG) was investigated and reported in this paper. It was found that EG not only strongly suppresses leakage of paraffin wax from the material over time but also significantly improves the photo oxidation stability. The increase in the melting point of wax incorporated within LLDPE matrix during aging was observed whereas the specific melting enthalpy of the paraffin wax decreased. This is mainly caused by the leakage of paraffin wax from the blends. The melting of neat LLDPE decreased during aging whereas its specific enthalpy of melting increased. Addition of EG led to the prolonged photo-oxidation stability of materials, as confirmed by Carbonyl Index measurements.
Haneen Abdelrazeq - One of the best experts on this subject based on the ideXlab platform.
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recycled polyethylene paraffin wax Expanded Graphite based heat absorbers for thermal energy storage an artificial aging study
Molecules, 2019Co-Authors: Haneen Abdelrazeq, Patrik Sobolciak, Mariam Al Ali Almaadeed, Mabrouk Ouederni, Igor KrupaAbstract:An artificial aging study of novel heat absorbers based on phase change materials (PCMs) prepared from recycled high-density polyethylene (HDPE), paraffin wax (PW), and Expanded Graphite (EG) was investigated. The optimal composition of PCMs contained 40 wt% HDPE, whereas the paraffin wax content ranged from 40 to 60 wt% and the Expanded Graphite content ranged from 5 to 15 wt%. PCMs were artificially aged through exposure to UV irradiation, enhanced temperature, and humidity. It was clearly demonstrated that the addition of EG to PCMs led to the suppression of PW leakage and improved the photooxidation stability of the PCMs during the aging process. The best performance was achieved by adding 15 wt% of EG to the PCMs. The sample shows a leakage of paraffin wax below 10%, retaining a melting enthalpy of PW within PCMs of 54.8 J/g, a thermal conductivity of 1.64 W/mK and the lowest photooxidation, characterized by an increase in the concentration of carbonyl groups from all investigated materials after artificial aging. Furthermore, PCMs mixed with EG exhibited good mechanical properties, even after 100 days of exposure to artificial aging. Finally, this work demonstrates a justification for the use of recycled plastics in the formation of PCMs.
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Recycled Polyethylene/Paraffin Wax/Expanded Graphite Based Heat Absorbers for Thermal Energy Storage: An Artificial Aging Study
'MDPI AG', 2019Co-Authors: Haneen Abdelrazeq, Patrik Sobolciak, Mabrouk Ouederni, Mariam Al-ali Al-maadeed, Igor KrupaAbstract:An artificial aging study of novel heat absorbers based on phase change materials (PCMs) prepared from recycled high-density polyethylene (HDPE), paraffin wax (PW), and Expanded Graphite (EG) was investigated. The optimal composition of PCMs contained 40 wt% HDPE, whereas the paraffin wax content ranged from 40 to 60 wt% and the Expanded Graphite content ranged from 5 to 15 wt%. PCMs were artificially aged through exposure to UV irradiation, enhanced temperature, and humidity. It was clearly demonstrated that the addition of EG to PCMs led to the suppression of PW leakage and improved the photooxidation stability of the PCMs during the aging process. The best performance was achieved by adding 15 wt% of EG to the PCMs. The sample shows a leakage of paraffin wax below 10%, retaining a melting enthalpy of PW within PCMs of 54.8 J/g, a thermal conductivity of 1.64 W/mK and the lowest photooxidation, characterized by an increase in the concentration of carbonyl groups from all investigated materials after artificial aging. Furthermore, PCMs mixed with EG exhibited good mechanical properties, even after 100 days of exposure to artificial aging. Finally, this work demonstrates a justification for the use of recycled plastics in the formation of PCMs
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the stabilizing effect of Expanded Graphite on the artificial aging of shape stabilized phase change materials
Polymer Testing, 2015Co-Authors: Patrik Sobolciak, Mustapha Karkri, Mariam Al Ali Almaadeed, Haneen Abdelrazeq, Mabrouk Ouederni, Igor KrupaAbstract:Abstract Artificial aging of Shape Stabilized Phase Change Materials (SSPCM) based on linear low density polyethylene (LLDPE) and paraffin wax (W) modified with various amounts of Expanded Graphite (EG) was investigated and reported in this paper. It was found that EG not only strongly suppresses leakage of paraffin wax from the material over time but also significantly improves the photo oxidation stability. The increase in the melting point of wax incorporated within LLDPE matrix during aging was observed whereas the specific melting enthalpy of the paraffin wax decreased. This is mainly caused by the leakage of paraffin wax from the blends. The melting of neat LLDPE decreased during aging whereas its specific enthalpy of melting increased. Addition of EG led to the prolonged photo-oxidation stability of materials, as confirmed by Carbonyl Index measurements.
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positive influence of Expanded Graphite on the physical behavior of phase change materials based on linear low density polyethylene and paraffin wax
Thermochimica Acta, 2015Co-Authors: Igor Krupa, Patrik Sobolciak, Mustapha Karkri, Haneen Abdelrazeq, Mabrouk Ouederni, Zuzana Nogellova, Zdenko Spitalský, Marta Malikova, Ivica JanigovaAbstract:Abstract The preparation of Phase Change Materials (PCM) with improved thermal conductivity, based on linear low-density polyethylene (LLDPE), paraffin wax with a melting point of approximately 42 °C and Expanded Graphite as well as the investigation of their physical behavior is reported in this paper. The absorption of heat energy is realized by phase transitions in the wax structure, i.e., solid–solid transitions between different crystalline structures of wax and, primarily, by a solid–liquid transition. An estimate of the total heat energy that can be reversibly absorbed or released by the designed materials was determined using Differential Scanning Calorimetry (DSC). The improvement in the thermal conductivity of the polymeric materials was obtained by incorporating Expanded Graphite into the blends. Expanded Graphite has a reinforcing effect on the PCM, resulting in an increase in the toughness (Young’s modulus) Significant amounts of wax are leached from the samples, and a higher wax content also results in more wax leakage. Graphite significantly reduces the wax loss from the samples.
Jinyue Yan - One of the best experts on this subject based on the ideXlab platform.
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preparation and thermal properties of polyethylene glycol Expanded Graphite blends for energy storage
Applied Energy, 2009Co-Authors: Xiaoxi Yang, Weilong Wang, Yutang Fang, Jing Ding, Jinyue YanAbstract:Expanded Graphite is a promising heat transfer promoter due to its high conductivity, which improves the thermal conductivity of organic phase change materials. Moreover, it can also serve as supporting materials to keep the shape of the blends stable during the phase transition. After various investigation, the results showed that the maximum weight percentage of polyethylene glycol was as high as 90% in this paper without any leakage during the melting period, with the latent heat of 161.2 J g-1 and the melting point of 61.46 °C. It was found that the value of the latent heat was related to the polyethylene glycol portion, increased with the increase in polyethylene glycol content. Moreover, the measured enthalpy of the composite phase change materials was proportional to the mass ratio of the polyethylene glycol component. The melting temperatures were almost the same with different ratios of composites. The conductivity of blends was improved significantly with the high value of 1.324 W m-1 K-1 compared to the pure polyethylene glycol conductivity of 0.2985 W m-1 K-1.
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preparation and thermal properties of polyethylene glycol Expanded Graphite blends for energy storage
Applied Energy, 2009Co-Authors: Xiaoxi Yang, Weilong Wang, Yutang Fang, Jing Ding, Jinyue YanAbstract:Expanded Graphite is a promising heat transfer promoter due to its high conductivity, which improves the thermal conductivity of organic phase change materials. Moreover, it can also serve as suppo ...
