Journal of the Egyptian Society of Tribology最新文献_第5页

ENHANCING THE EFFICIENCY OF TRIBOELECTRIC NANOGENERATOR BY ELECTROSTATIC INDUCTION 利用静电感应提高摩擦纳米发电机的效率

Journal of the Egyptian Society of Tribology Pub Date : 2023-01-01 DOI: 10.21608/jest.2023.284022

{"title":"ENHANCING THE EFFICIENCY OF TRIBOELECTRIC NANOGENERATOR BY ELECTROSTATIC INDUCTION","authors":"","doi":"10.21608/jest.2023.284022","DOIUrl":"https://doi.org/10.21608/jest.2023.284022","url":null,"abstract":"The present work aims to enhance the efficiency of the triboelectric nanogenerator (TENG) by electrostatic induction. The two surfaces of the TENG were made of polytetrafluoroethylene (PTFE) and polyamide (PA) due to their location in the triboelectric series where contact and separation as well sliding of two materials were carried out. Electrostatic induction was proposed to insert a coil of insulated copper wires wrapped on the surface of hollow box, representing the frame of the coil, of different height under the surface of PTFE. The voltage difference between PTFE film coating insulated copper wire coil and PA was measured. It was found that voltage remarkably increased up to maximum then drastically decreased with increasing the height of the frame containing the copper coil. Based on the experimental observation, it seems that induction of the copper coil is the reason for the voltage increase due the induced electric field. The significant voltage increase depends directly on the electric field that is much influenced by the height of the hollow box containing the coil. Besides, transverse sliding showed the highest voltage, while contact and separation displayed the lowest voltage values. Inserting steel sheet under PA surface, significantly increased the voltage due to the increase of the magnetic field. Using two layers of the coil offered the highest voltage values, then as the number of layers increased, voltage decreased.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125922835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

TRIBOELECTRIC NANOGENERATOR BASED ON CONTACT AND SEPARATION AS WELL AS SLIDING OF POLYAMIDE ON POLYTETRAFLUOROETHELENE 基于聚酰胺在聚四氟乙烯上的接触分离和滑动的摩擦电纳米发电机

Journal of the Egyptian Society of Tribology Pub Date : 2023-01-01 DOI: 10.21608/jest.2023.284019

{"title":"TRIBOELECTRIC NANOGENERATOR BASED ON CONTACT AND SEPARATION AS WELL AS SLIDING OF POLYAMIDE ON POLYTETRAFLUOROETHELENE","authors":"","doi":"10.21608/jest.2023.284019","DOIUrl":"https://doi.org/10.21608/jest.2023.284019","url":null,"abstract":"Triboelectric nanogenerators (TENGs) have been proposed to harvest the mechanical energy because of their low cost and simplicity of manufacturing. This work discusses the possibility of designing a TENG operated by the contact and separation as well sliding of two dissimilar materials such as polytetrafluoroethylene (PTFE) and polyamide (PA). The experimental observation revealed that adhering insulated copper wires in PTFE surface sliding on PA increased the voltage generated from the electrostatic charge (ESC). Copper wires of 0.1 mm diameter generated the highest voltage values, then the voltage decreased with increasing the diameter of the wires. It seems that copper wires induced an electric field that induced an electric current. Besides, as the number of copper wires turns increased, voltage difference of the open circuit increased. Generally, contact and separation recorded relatively lower voltage than sliding, while sliding in the transverse direction showed the highest values. It seems that the double layer of ESC generated due to the friction on the contact surfaces of PTFE and PA generated an electric field, while the electric current induced by the copper wires generated extra electric field on the sliding surfaces leading to the voltage increase. It can be concluded that the efficiency of the triboelectric nanogenerators can be enhanced by inserting copper coil under one of the contacting surfaces","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131045650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

MECHANICAL PROPERTIES OF HIGH DENSITY POLYETHYLENE FILLED BY GRAPHENE OXIDE NANO PARTICLES 氧化石墨烯纳米颗粒填充高密度聚乙烯的力学性能

Journal of the Egyptian Society of Tribology Pub Date : 2023-01-01 DOI: 10.21608/jest.2023.284015

引用次数: 0

EFFECT OF REINFORCING POLYPROPYLENE BY STEEL WIRES ON FRICTION COEFFICIENT AND WEAR 钢丝增强聚丙烯对摩擦系数和磨损的影响

Journal of the Egyptian Society of Tribology Pub Date : 2023-01-01 DOI: 10.21608/jest.2023.284016

{"title":"EFFECT OF REINFORCING POLYPROPYLENE BY STEEL WIRES ON FRICTION COEFFICIENT AND WEAR","authors":"","doi":"10.21608/jest.2023.284016","DOIUrl":"https://doi.org/10.21608/jest.2023.284016","url":null,"abstract":"The effect of reinforcing polypropylene (PP) by unidirectional continuous steel wires on friction coefficient and wear was discussed in this work. Scratch test was carried to evaluate the tribological performance of the proposed composites. The tested composites were sheets PP of 5.0 mm thickness. The steel reinforcing wires were 0.3, 0.5, 0.6, 0.7 and 0.8 mm diameters. The numbers of wires reinforcing the test specimens were 0, 3, 6, 9, 12 and 15. The wires were distributed parallel to the direction of motion. It was observed that friction coefficient displayed by the scratch of PP reinforced by steel wires decreased with increasing number and diameter of steel wires. The presence of steel wires decreased the hardness of the PP so that the material removal by the indenter was easier, where PP was affected by the rate of cooling during molding. Besides, reinforcing PP by steel wires increased the rate of cooling causing softening of the PP matrix and decreased the hardness. It can be concluded that presence of steel wires experienced wear decreasing. In addition to that, the influence of the cooling rate on the hardness and the mechanical properties of the polymers affected the wear. Normal load showed pronounced effect on wear of PP.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132547155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

FRICTIONAL AND ELECTROSTATIC CHARGE PROPETIES OF TEXTILE MATERIALS 纺织材料的摩擦和静电电荷特性

Journal of the Egyptian Society of Tribology Pub Date : 2022-10-01 DOI: 10.21608/jest.2022.266530

引用次数: 0

TRIBOLOGICAL PERFORMANCE OF EPOXY FLOOR FILLED BY RECYCLED RUBBER PARTICLES 再生橡胶颗粒填充环氧地坪的摩擦学性能

Journal of the Egyptian Society of Tribology Pub Date : 2022-10-01 DOI: 10.21608/jest.2022.266529

{"title":"TRIBOLOGICAL PERFORMANCE OF EPOXY FLOOR FILLED BY RECYCLED RUBBER PARTICLES","authors":"","doi":"10.21608/jest.2022.266529","DOIUrl":"https://doi.org/10.21608/jest.2022.266529","url":null,"abstract":"It is essential to reduce the brittleness that limits the applications of floor materials made of epoxy resins. In the present work, recycled rubber particles and paraffin oil are filling epoxy. Recycled rubber of different sizes were used as filling material, while oil content was 5.0 and 10.0 wt. %. The rubber is added to increase the toughness, while oil is to increase the viscoelastic property of the proposed composites. The tribological properties of the tested composites are investigated. The experimental observation showed that increasing the rubber content significantly increased friction coefficient. The highest friction values were observed for rubber particle size ranging between 1.0 to 2.0 mm. Composites filled by oil showed that further increase in rubber particle size was accompanied by friction increase. Generally, the values of friction coefficient were much higher than that recommended for safe floor materials. In abrasion test, wear increased as the rubber content increased due to the weakening of the epoxy matrix, where the highest friction coefficient and lowest wear were displayed by the tested composites filled by 5.0 wt. % oil and 80 wt. % rubber content of (2.0 – 3.0) mm particle size. According to the experimental results, those composites can be recommended as floor materials, where the addition of oil enhanced the viscoelastic property of the rubber and consequently the abrasion resistance increased.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125958668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

INFLUENCE OF MULTI-WALLED CARBON NANOTUBES CONTENT ON THE MECHANICAL PROPERTIES OF COLD AND HOT CURED ACRYLIC RESIN FOR DENTURE BASE. 多壁碳纳米管含量对义齿基托用冷、热固化丙烯酸树脂力学性能的影响

Journal of the Egyptian Society of Tribology Pub Date : 2022-10-01 DOI: 10.21608/jest.2022.266534

{"title":"INFLUENCE OF MULTI-WALLED CARBON NANOTUBES CONTENT ON THE MECHANICAL PROPERTIES OF COLD AND HOT CURED ACRYLIC RESIN FOR DENTURE BASE.","authors":"","doi":"10.21608/jest.2022.266534","DOIUrl":"https://doi.org/10.21608/jest.2022.266534","url":null,"abstract":"The main objective of this work is to investigate the effect of multi-walled carbon nanotubes (MWCNTs) on the mechanical properties of polymethyl methacrylate (PMMA) reinforced by MWCNTs of 0.1, 0.2, 0.3, 0.4 and 0.5 wt. % contents. The mechanical properties investigated in the present study are compressive strength, apparent modulus of elasticity, modulus of resilience, modulus of toughness and ductility at yield. PMMA is prepared at both hot and cold acrylic resins to be used as denture base materials. Compression test was considered as a useful tool to describe the mechanical properties of the PMMA/ MWCNTs tested composites. The tests have been carried out on a digital controlled universal testing machine. Based on the experiments, it is shown that the mechanical properties of the cold PMMA were higher than that measured for the hot at 0 wt. %, MWCNTs, while at 0.1 wt. %, the mechanical properties of the hot MWCNTs/PMMA composites were higher than the cold ones. On the other hand, it was found that after 0.1 wt. %, with increasing MWCNTs content the mechanical properties decreased gradually for both cold and hot composites. The improvement in the strength at 0.1 wt. % may be due to the interfacial shear strength between nanofiller and matrix that was relatively high due to formation of cross links or supra molecular bonding which cover or shield the nanofiller that in turn prevent propagation of crack. From this study, it can be concluded that hot cured composites are better than cold cured composites as denture base materials.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133556917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CONTACT AND SEPARATION OF KAPTON AND POLYMETHYLMETHACRYLATE TRIBOELECTRIC NANOGENERATOR 卡普顿与聚甲基丙烯酸甲酯摩擦电纳米发电机的接触与分离

Journal of the Egyptian Society of Tribology Pub Date : 2022-10-01 DOI: 10.21608/jest.2022.266536

Al-Kabbany

{"title":"CONTACT AND SEPARATION OF KAPTON AND POLYMETHYLMETHACRYLATE TRIBOELECTRIC NANOGENERATOR","authors":"Al-Kabbany","doi":"10.21608/jest.2022.266536","DOIUrl":"https://doi.org/10.21608/jest.2022.266536","url":null,"abstract":"Triboelectric nanogenerators are devices that utilize the triboelectric effect in order to generate electrical current. Recently, they have become very popular in many applications. The most important are self-powered sensors and energy harvesting. They can be made in two varieties, contact-and-separation mode as well as sliding mode triboelectric nanogenerator (TENG). Two of the best pair of materials that can be used are Kapton and polymethylmethacrylate (PMMA) since they are at opposite sides of the triboelectric series. Usually, the entire side of a TENG is covered with a dielectric electrode terminal. This study investigates the optimal design of a Kapton side in a Kapton/PMMA contact and separation mode triboelectric nanogenerator. It was found that using two Kapton-electrode terminals that are separated by a distance achieved better values for both open-circuit voltage and closed-circuit current in this particular setup. This is due to the self-correcting mechanism that is inherent in this setup that improves the contact between the two sides of the triboelectric nanogenerator. This design is also more material efficient and is thus recommended for use in contact and separation mode triboelectric nanogenerators.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126400771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

INVESTIGATION OF THE ABRASION RESISTANCE OF ALUMINUM COPPER MAGNESIUM ALLOY 铝铜镁合金的耐磨性研究

Journal of the Egyptian Society of Tribology Pub Date : 2022-10-01 DOI: 10.21608/jest.2022.266532

引用次数: 0

REDUCING THE ELECTROSTATIC DISCHARGE GENERATED FROM THE CONTACT AND SEPARATION AS WELL AS SLIDING OF POLYMERIC TEXTILES ON COTTON 减少高分子纺织品在棉上的接触、分离和滑动产生的静电放电

Journal of the Egyptian Society of Tribology Pub Date : 2022-10-01 DOI: 10.21608/jest.2022.266535

{"title":"REDUCING THE ELECTROSTATIC DISCHARGE GENERATED FROM THE CONTACT AND SEPARATION AS WELL AS SLIDING OF POLYMERIC TEXTILES ON COTTON","authors":"","doi":"10.21608/jest.2022.266535","DOIUrl":"https://doi.org/10.21608/jest.2022.266535","url":null,"abstract":"The quality of clothes depends on the comfort of textiles. The measure of the comfort is the friction displayed by the sliding of the textiles on skin or other textiles as well as the generation of electrostatic charge (ESC). As the friction increased, the comfort of the clothes decreased. The present work discusses the friction and ESC generated from the contact and separation as well as sliding of polymeric textiles on cotton. Test specimens of composites containing polyester (PET) and polyamide (PA) textile fibers were prepared and tested by contact and separation as well as sliding under different loads against cotton textiles. Ultra surface DC Voltmeter was used to measure ESC of the tested textile composites. It was found that friction coefficient displayed by the sliding of the PET/PA blend strings on cotton textile drastically decreased with increasing PA. At contact and separation with cotton, ESC generated on the surface of the tested blend showed the highest negative values at 100 % PET, then decreased with increasing PA content. While, the positive ESC generated on the surface of the cotton recorded zero value at 80 % PA, then decreased with increasing PA content to record negative values. Sliding displayed relatively higher ESC at 100 % PA than that observed in contact and separation. The zero values of ESC were observed at 93 % PA. ESC generated on the cotton counterface recorded higher values at 100 % PET. As PA content increased, ESC drastically decreased to negative charge at 100 % PA.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134345334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2