The triboelectric nanogenerator (TENG), which converts mechanical energy to electrical output, is garnering attention owing to their application in low-energy electronic devices as a power source. To utilize the TENG as a power source, amplifying the electrical output and enhancing energy conversion efficiency are necessary. As the TENG generates electrical output through contact electrification and electrostatic charge induction, the electrical output can be amplified by enhancing the two mechanisms through the enlargement of the TENG area and the adoption of the pre-charge injected film (electret). In this regard, the fabrication of the large-scale electret is significant for amplifying the electrical output of the TENG. In this study, a corona charging system is proposed for the fabrication of the large-scale electret with a uniform charge-distributed area. Corona charging injects O2 ions into a dielectric film with an electric field generated between the pin electrode and ground electrode (GE). Through the utilization of a multi-PE (MPE) and conveyor belt-shaped GE (CBsGE) in the corona charging system, the O2 molecules near the pins can be ionized simultaneously while the CBsGE is rotating. Thus, the O2 ions can be injected uniformly into a wide area. About a voltage of 400 V and current of 45 μA can be generated by applying the fabricated electret to the TENG. As several electrets with various sizes can be fabricated simultaneously, the TENG with high electrical output can be batch fabricated to enhance its practicality significantly.
{"title":"Development of large-scale electret fabrication system for triboelectric nanogenerator electrical output amplification","authors":"Sunmin Jang, Sumin Cho, Donghan Lee, Yoonsang Ra, Dongik Kam, Jaehyun Lee, Gyuha Lee, Moonwoo La, D. Choi","doi":"10.1088/2631-6331/aca138","DOIUrl":"https://doi.org/10.1088/2631-6331/aca138","url":null,"abstract":"The triboelectric nanogenerator (TENG), which converts mechanical energy to electrical output, is garnering attention owing to their application in low-energy electronic devices as a power source. To utilize the TENG as a power source, amplifying the electrical output and enhancing energy conversion efficiency are necessary. As the TENG generates electrical output through contact electrification and electrostatic charge induction, the electrical output can be amplified by enhancing the two mechanisms through the enlargement of the TENG area and the adoption of the pre-charge injected film (electret). In this regard, the fabrication of the large-scale electret is significant for amplifying the electrical output of the TENG. In this study, a corona charging system is proposed for the fabrication of the large-scale electret with a uniform charge-distributed area. Corona charging injects O2 ions into a dielectric film with an electric field generated between the pin electrode and ground electrode (GE). Through the utilization of a multi-PE (MPE) and conveyor belt-shaped GE (CBsGE) in the corona charging system, the O2 molecules near the pins can be ionized simultaneously while the CBsGE is rotating. Thus, the O2 ions can be injected uniformly into a wide area. About a voltage of 400 V and current of 45 μA can be generated by applying the fabricated electret to the TENG. As several electrets with various sizes can be fabricated simultaneously, the TENG with high electrical output can be batch fabricated to enhance its practicality significantly.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48492568","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}
Pub Date : 2022-11-08DOI: 10.1088/2631-6331/aca139
Sumin Cho, Sunmin Jang, Donghan Lee, Yoonsang Ra, Dongik Kam, Jong Woo Kim, Do-Shik Shin, Kyoung Duck Seo, D. Choi
Piezoelectric sensors have been developed due to the self-powered sensing and flexibility and the promising potential applications in the electronic skin (e-skin) inspired by human skin. However, although the piezoelectric sensors have an excellent performance in detecting human movements, it is difficult to distinguish external mechanical stimuli such as tapping in a single structure, together. Here, we suggest a self-powered e-skin based on electrospun poly(vinylidene fluoride-trifluoroethylene), nanofiber hybrid triboelectric–piezoelectric sensor (E-HTPS), that can identify between human motions and external touch based on both triboelectric effect and piezoelectric effect. Triboelectric effect-based sensors have a good electrical output characteristic with various advantages of high-flexibility and simple working operation. Hence, the E-HTPS consists of two layers, triboelectric layer as a tactile sensor and piezoelectric layer as a human motion sensor. Therefore, we demonstrate that the E-HTPS can detect human movements and even finger touch with attached to the target body part. Consequently, the E-HTPS could provide an effective approach to designing the self-powered e-skin as an artificial sensory system for healthcare monitoring and soft robotics.
{"title":"Self-powered hybrid triboelectric–piezoelectric electronic skin based on P(VDF-TrFE) electrospun nanofibers for artificial sensory system","authors":"Sumin Cho, Sunmin Jang, Donghan Lee, Yoonsang Ra, Dongik Kam, Jong Woo Kim, Do-Shik Shin, Kyoung Duck Seo, D. Choi","doi":"10.1088/2631-6331/aca139","DOIUrl":"https://doi.org/10.1088/2631-6331/aca139","url":null,"abstract":"Piezoelectric sensors have been developed due to the self-powered sensing and flexibility and the promising potential applications in the electronic skin (e-skin) inspired by human skin. However, although the piezoelectric sensors have an excellent performance in detecting human movements, it is difficult to distinguish external mechanical stimuli such as tapping in a single structure, together. Here, we suggest a self-powered e-skin based on electrospun poly(vinylidene fluoride-trifluoroethylene), nanofiber hybrid triboelectric–piezoelectric sensor (E-HTPS), that can identify between human motions and external touch based on both triboelectric effect and piezoelectric effect. Triboelectric effect-based sensors have a good electrical output characteristic with various advantages of high-flexibility and simple working operation. Hence, the E-HTPS consists of two layers, triboelectric layer as a tactile sensor and piezoelectric layer as a human motion sensor. Therefore, we demonstrate that the E-HTPS can detect human movements and even finger touch with attached to the target body part. Consequently, the E-HTPS could provide an effective approach to designing the self-powered e-skin as an artificial sensory system for healthcare monitoring and soft robotics.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45217791","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}
Pub Date : 2022-10-31DOI: 10.1088/2631-6331/ac9c42
V. Nguyen
Some solutions in this work are developed to estimate the elastic moduli of three-phase isotropic composite with random coated-ellipse inclusion in the matrix. Solutions to the macro-elastic moduli of materials in two-dimensional space using approximation and numerical methods including equivalent-inclusion (EI), polarization approximation (PA), differential approximations (DA), and fast Fourier transformation (FFT). In which, there is a combination of those methods to give approximations such as EI-PA, EI-DA, FFT-EI. The construction algebraic expressions can be directly applied to the random coated-ellipse model, in special cases it can be used for circular aggregate particles. The numerical solutions using FFT analysis will be compared with EI-PA, EI-DA, and Hashin–Shtrikman’s bounds. From this, it is possible to indicate the best solution that engineers can use to determine the elastic modulus of the coated-ellipse model.
{"title":"Solutions for elastic moduli of three-phase composite with random distribution of coated-ellipse inclusions","authors":"V. Nguyen","doi":"10.1088/2631-6331/ac9c42","DOIUrl":"https://doi.org/10.1088/2631-6331/ac9c42","url":null,"abstract":"Some solutions in this work are developed to estimate the elastic moduli of three-phase isotropic composite with random coated-ellipse inclusion in the matrix. Solutions to the macro-elastic moduli of materials in two-dimensional space using approximation and numerical methods including equivalent-inclusion (EI), polarization approximation (PA), differential approximations (DA), and fast Fourier transformation (FFT). In which, there is a combination of those methods to give approximations such as EI-PA, EI-DA, FFT-EI. The construction algebraic expressions can be directly applied to the random coated-ellipse model, in special cases it can be used for circular aggregate particles. The numerical solutions using FFT analysis will be compared with EI-PA, EI-DA, and Hashin–Shtrikman’s bounds. From this, it is possible to indicate the best solution that engineers can use to determine the elastic modulus of the coated-ellipse model.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42819324","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}
Pub Date : 2022-10-28DOI: 10.1088/2631-6331/ac9e89
Mohd Azaman Md Deros, Nur Ainin Faissal, M.S. Abdul Majid, Mohd Ridzuan Mohd Jamir
This study aims to comprehensively review previous and present research on the dynamic responses of 3D-printed sandwich composite structures. The low-velocity impact and failure mechanisms caused by the impact load and energy absorption capabilities are discussed. Investigating the processes and mechanics of a material is an essential step in addressing the structural failure problems, which are mostly caused by a fracture. The encouraging impact resistance results have prompted researchers to explore the capabilities of structural integrity to optimize performance, which can be accomplished leveraging the enhanced material and architectural combinations of sandwich composites. The ongoing research into low-velocity behaviour of fabricated sandwich composite structures with 3D-printed hexagonal honeycomb cores and varying core materials is emphasized in this study.
{"title":"Investigating the low-velocity impact behaviour of sandwich composite structures with 3D-printed hexagonal honeycomb core—a review","authors":"Mohd Azaman Md Deros, Nur Ainin Faissal, M.S. Abdul Majid, Mohd Ridzuan Mohd Jamir","doi":"10.1088/2631-6331/ac9e89","DOIUrl":"https://doi.org/10.1088/2631-6331/ac9e89","url":null,"abstract":"This study aims to comprehensively review previous and present research on the dynamic responses of 3D-printed sandwich composite structures. The low-velocity impact and failure mechanisms caused by the impact load and energy absorption capabilities are discussed. Investigating the processes and mechanics of a material is an essential step in addressing the structural failure problems, which are mostly caused by a fracture. The encouraging impact resistance results have prompted researchers to explore the capabilities of structural integrity to optimize performance, which can be accomplished leveraging the enhanced material and architectural combinations of sandwich composites. The ongoing research into low-velocity behaviour of fabricated sandwich composite structures with 3D-printed hexagonal honeycomb cores and varying core materials is emphasized in this study.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":"5 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48908502","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}
Pub Date : 2022-10-13DOI: 10.1088/2631-6331/ac99d2
C. Nwambu, C. Robert, Parvez Alam
A dynamic mechanical thermal analyser operating in the single cantilever mode was used to examine the dynamic mechanical properties of unaged and hygrothermally aged discontinuous asymmetric helicoidal (Bouligand) carbon fibre reinforced plastic (CFRP) composites as a function of fibre architecture. The discontinuous Bouligand was manufactured using two major pitch angles as independent variables: 90° and 120° and from each major pitch angle, minor interply pitch angles were used as independent variables ranging 5°–25°. The composites were tested as either dry unaged specimens or following hygrothermal ageing in seawater at the constant temperatures of 40 °C and 60 °C for over 2000 h. We find that the viscoelastic properties E′ and E″ are adversely affected by both hygrothermal aging and the minor pitch angle, but not the major pitch angle. Higher hygrothermal ageing temperatures and increasing minor pitch angles are found to decrease the energy absorption and dissipation capacities of discontinuous Bouligand structured CFRP composites. The tan-δ curves also indicate that hygrothermal ageing increases the heterogeneity of discontinuous Bouligand structured composites, with separate viscoelastic phases and glass transition temperatures.
{"title":"Dynamic mechanical thermal analysis of unaged and hygrothermally aged discontinuous Bouligand structured CFRP composites","authors":"C. Nwambu, C. Robert, Parvez Alam","doi":"10.1088/2631-6331/ac99d2","DOIUrl":"https://doi.org/10.1088/2631-6331/ac99d2","url":null,"abstract":"A dynamic mechanical thermal analyser operating in the single cantilever mode was used to examine the dynamic mechanical properties of unaged and hygrothermally aged discontinuous asymmetric helicoidal (Bouligand) carbon fibre reinforced plastic (CFRP) composites as a function of fibre architecture. The discontinuous Bouligand was manufactured using two major pitch angles as independent variables: 90° and 120° and from each major pitch angle, minor interply pitch angles were used as independent variables ranging 5°–25°. The composites were tested as either dry unaged specimens or following hygrothermal ageing in seawater at the constant temperatures of 40 °C and 60 °C for over 2000 h. We find that the viscoelastic properties E′ and E″ are adversely affected by both hygrothermal aging and the minor pitch angle, but not the major pitch angle. Higher hygrothermal ageing temperatures and increasing minor pitch angles are found to decrease the energy absorption and dissipation capacities of discontinuous Bouligand structured CFRP composites. The tan-δ curves also indicate that hygrothermal ageing increases the heterogeneity of discontinuous Bouligand structured composites, with separate viscoelastic phases and glass transition temperatures.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41912995","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}
Pub Date : 2022-10-11DOI: 10.1088/2631-6331/ac9951
Do-Kyun Kim, Seong Hwan Lee, Shi Hong, M. Ahn, Se-Won Han, D. Lee, Seunggun Yu
For high voltage (HV) power cable applications, various studies have been performed to improve the mechanical and electrical properties of polypropylene (PP)-based insulation materials to replace crosslinked polyethylene. However, studies on the effect of additives to yield additional PP properties are still lacking. Herein, we prepared PP blends by melt-mixing widely used commercial flame retardants for PP with isotactic PP (iPP) and investigated their electrical breakdown, flame retardancy behaviors, and UV stability. Among the five kinds of flame retardants employed, aluminum hypophosphite (AHP), aluminum diethyl phosphinate, melamine pyrophosphate, ammonium polyphosphate (APP), and APP treated with silane, AHP was very effective in minimizing the decrease of the direct current breakdown strength of iPP at both 25 °C and 110 °C in the range of 5–20 phr. Particularly, only AHP afforded V-2 grade flame retardancy to iPP, and the flame retardancy was maintained even when the content was reduced to 3 phr. Furthermore, upon exposure to ultraviolet (UV) rays for 5 d, the tensile strength of pristine iPP decreased by approximately 44%, while that of a blend with 3 phr AHP decreased by only 10%. The study results will contribute to the optimization of power cable products through the use of appropriate flame retardants in the design of high-performance PP-based HV insulation materials.
{"title":"Influence of phosphorus-based flame retardants on polypropylene insulation for high-voltage power cable applications","authors":"Do-Kyun Kim, Seong Hwan Lee, Shi Hong, M. Ahn, Se-Won Han, D. Lee, Seunggun Yu","doi":"10.1088/2631-6331/ac9951","DOIUrl":"https://doi.org/10.1088/2631-6331/ac9951","url":null,"abstract":"For high voltage (HV) power cable applications, various studies have been performed to improve the mechanical and electrical properties of polypropylene (PP)-based insulation materials to replace crosslinked polyethylene. However, studies on the effect of additives to yield additional PP properties are still lacking. Herein, we prepared PP blends by melt-mixing widely used commercial flame retardants for PP with isotactic PP (iPP) and investigated their electrical breakdown, flame retardancy behaviors, and UV stability. Among the five kinds of flame retardants employed, aluminum hypophosphite (AHP), aluminum diethyl phosphinate, melamine pyrophosphate, ammonium polyphosphate (APP), and APP treated with silane, AHP was very effective in minimizing the decrease of the direct current breakdown strength of iPP at both 25 °C and 110 °C in the range of 5–20 phr. Particularly, only AHP afforded V-2 grade flame retardancy to iPP, and the flame retardancy was maintained even when the content was reduced to 3 phr. Furthermore, upon exposure to ultraviolet (UV) rays for 5 d, the tensile strength of pristine iPP decreased by approximately 44%, while that of a blend with 3 phr AHP decreased by only 10%. The study results will contribute to the optimization of power cable products through the use of appropriate flame retardants in the design of high-performance PP-based HV insulation materials.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49665442","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}
Pub Date : 2022-09-21DOI: 10.1088/2631-6331/ac93e4
Mun Sang Yun, Thanh Hai Nguyen, D. Tran, N. Kim, J. Lee
In an attempt to find an alternative approach to reduce the use of noble metal-based electrocatalysts, a new hybrid nanostructure based on molybdenum-iron nitride nanoparticles (Mo–Fe–N NPs) deposited carbon nanotubes (CNTs) supported on nickel foam substrate is fabricated via a facile synthetic approach. Highly uniform and dense Mo–Fe–N NPs achieves full coverage on surface of the CNTs with good interactions and enhanced hetero-charge transfer, thus leading to improvements in both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). The fabricated hybrid shows small overpotential of 106 mV at 10 mA cm−2 for HER and 420 mV at 100 mA cm−2 for OER, along with prospective stability after 20 h of continuous testing in alkaline electrolyte (1.0 M KOH). The catalytic activities of the Mo–Fe–N/CNTs material are shown to be superior to those of other synthesized catalysts as well as of commercial Pt/C and RuO2 catalysts. These results may pave a potential route to the fabrication of novel electrocatalysts having high performance that can effectively replace precious metal-based catalysts in electrochemical water splitting technology.
为了寻找一种减少贵金属基电催化剂使用的替代方法，通过一种简单的合成方法，制备了一种基于氮化钼铁纳米颗粒（Mo–Fe–N NPs）沉积的碳纳米管（CNTs）的新型混合纳米结构。高度均匀和致密的Mo–Fe–N NPs以良好的相互作用和增强的异质电荷转移在CNT表面实现了全覆盖，从而改善了析氢反应（HER）和析氧反应（OER）。所制备的杂化物在10 mA cm−2时HER显示出106 mV的小过电位，在100 mA cm−2中OER显示出420 mV的小超电位，并且在碱性电解质（1.0 M KOH）中连续测试20小时后具有预期的稳定性。Mo–Fe–N/CNTs材料的催化活性优于其他合成催化剂以及商业Pt/C和RuO2催化剂。这些结果可能为制备具有高性能的新型电催化剂铺平了一条潜在的道路，该催化剂可以有效地取代电化学水分解技术中的贵金属基催化剂。
{"title":"Ultrasmall molybdenum-iron nitride nanoparticles confined carbon nanotubes hybrids for efficient overall water splitting","authors":"Mun Sang Yun, Thanh Hai Nguyen, D. Tran, N. Kim, J. Lee","doi":"10.1088/2631-6331/ac93e4","DOIUrl":"https://doi.org/10.1088/2631-6331/ac93e4","url":null,"abstract":"In an attempt to find an alternative approach to reduce the use of noble metal-based electrocatalysts, a new hybrid nanostructure based on molybdenum-iron nitride nanoparticles (Mo–Fe–N NPs) deposited carbon nanotubes (CNTs) supported on nickel foam substrate is fabricated via a facile synthetic approach. Highly uniform and dense Mo–Fe–N NPs achieves full coverage on surface of the CNTs with good interactions and enhanced hetero-charge transfer, thus leading to improvements in both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). The fabricated hybrid shows small overpotential of 106 mV at 10 mA cm−2 for HER and 420 mV at 100 mA cm−2 for OER, along with prospective stability after 20 h of continuous testing in alkaline electrolyte (1.0 M KOH). The catalytic activities of the Mo–Fe–N/CNTs material are shown to be superior to those of other synthesized catalysts as well as of commercial Pt/C and RuO2 catalysts. These results may pave a potential route to the fabrication of novel electrocatalysts having high performance that can effectively replace precious metal-based catalysts in electrochemical water splitting technology.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43132535","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}
Pub Date : 2022-09-21DOI: 10.1088/2631-6331/ac93e3
Bog G. Kim, Byungwoo Youn, Yeeun Song, Doojin Lee
Polyhedral oligomeric silsesquioxane (POSS) functionalized graphene oxide (GO) is prepared to improve the dispersity of GO nanofillers in a polydimethylsiloxane matrix. Improved interfacial affinity of the GO-POSS with a polymer matrix is characterized by a small amplitude oscillatory shear test. We confirm that the POSS-functionalized GO induces better filler dispersibility and less filler aggregation in the matrix, resulting in enhanced elasticity in the solution. After curing, the POSS interface works as a soft and lubricating layer at the interface, which enhances interfacial damping within the nanocomposites.
{"title":"Enhanced dispersion stability and interfacial damping of POSS-functionalized graphene oxide in PDMS nanocomposites","authors":"Bog G. Kim, Byungwoo Youn, Yeeun Song, Doojin Lee","doi":"10.1088/2631-6331/ac93e3","DOIUrl":"https://doi.org/10.1088/2631-6331/ac93e3","url":null,"abstract":"Polyhedral oligomeric silsesquioxane (POSS) functionalized graphene oxide (GO) is prepared to improve the dispersity of GO nanofillers in a polydimethylsiloxane matrix. Improved interfacial affinity of the GO-POSS with a polymer matrix is characterized by a small amplitude oscillatory shear test. We confirm that the POSS-functionalized GO induces better filler dispersibility and less filler aggregation in the matrix, resulting in enhanced elasticity in the solution. After curing, the POSS interface works as a soft and lubricating layer at the interface, which enhances interfacial damping within the nanocomposites.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41879099","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}
Pub Date : 2022-08-30DOI: 10.1088/2631-6331/ac8ddf
A. Adeniyi, S. Abdulkareem, Joshua O. Ighalo, Maryam T. Abdulkareem, K. Iwuozor, E. Emenike
This study aimed to investigate the crystallographic, functional group and microstructural analysis of elephant grass biochar reinforced hybrid polystyrene composite doped with aluminium. The composites were prepared by the mixing and hand-layup technique. Composites were characterised by x-ray diffractometry, Fourier transform infra-red spectroscopy and scanning electron microscope. It was observed that crystallographic properties of the composite were improved by aluminium doping. Crystallite size and d-spacing were found to decrease from 6.3542 to 5.2453 nm and 3.183 to 2.362 Å respectively due to 8% aluminium doping. Functional group analysis revealed that doping affected interactions between biochar and polystyrene resin. Microstructural analysis revealed that dispersion was optimal at 2% doping and interfacial adhesion was optimal at 8% doping.
{"title":"A study on the hybrid polystyrene composite filled with elephant-grass-biochar and doped-aluminium-content","authors":"A. Adeniyi, S. Abdulkareem, Joshua O. Ighalo, Maryam T. Abdulkareem, K. Iwuozor, E. Emenike","doi":"10.1088/2631-6331/ac8ddf","DOIUrl":"https://doi.org/10.1088/2631-6331/ac8ddf","url":null,"abstract":"This study aimed to investigate the crystallographic, functional group and microstructural analysis of elephant grass biochar reinforced hybrid polystyrene composite doped with aluminium. The composites were prepared by the mixing and hand-layup technique. Composites were characterised by x-ray diffractometry, Fourier transform infra-red spectroscopy and scanning electron microscope. It was observed that crystallographic properties of the composite were improved by aluminium doping. Crystallite size and d-spacing were found to decrease from 6.3542 to 5.2453 nm and 3.183 to 2.362 Å respectively due to 8% aluminium doping. Functional group analysis revealed that doping affected interactions between biochar and polystyrene resin. Microstructural analysis revealed that dispersion was optimal at 2% doping and interfacial adhesion was optimal at 8% doping.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46406058","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}
Pub Date : 2022-08-30DOI: 10.1088/2631-6331/ac8658
J. Chohan, Raman Kumar, Sandeep Singh, Shubham Sharma, R. Ilyas
Over the past few decades, three-dimensional (3D) printing technologies have surpassed the conventional manufacturing techniques due to their wide applications and advantages. The applications of 3D printing in biomedical field is ever increasing due to improvement in accuracy and surface quality of products. The development of biomedical implants through patient specific data and rapid tooling techniques has revolutionized the research activities. Now-a-days, the metal printers have capability to directly create metal implants using biocompatible metallic alloys. This paper focuses on the potential applications of 3D printing in biomedical fields with specific emphasis on tissue engineering and bio-printing of organs using bio-inks. This paper also reviews various biocompatible and biodegradable materials used in recent in-vivo and in-vitro studies. It has been deduced from the study that use of natural fibers in polymers resulted in improved mechanical strength of products. Also, the implementation of additive manufacturing technologies for production of composites would lead to production of customized product.
{"title":"A comprehensive review on applications of 3D printing in natural fibers polymer composites for biomedical applications","authors":"J. Chohan, Raman Kumar, Sandeep Singh, Shubham Sharma, R. Ilyas","doi":"10.1088/2631-6331/ac8658","DOIUrl":"https://doi.org/10.1088/2631-6331/ac8658","url":null,"abstract":"Over the past few decades, three-dimensional (3D) printing technologies have surpassed the conventional manufacturing techniques due to their wide applications and advantages. The applications of 3D printing in biomedical field is ever increasing due to improvement in accuracy and surface quality of products. The development of biomedical implants through patient specific data and rapid tooling techniques has revolutionized the research activities. Now-a-days, the metal printers have capability to directly create metal implants using biocompatible metallic alloys. This paper focuses on the potential applications of 3D printing in biomedical fields with specific emphasis on tissue engineering and bio-printing of organs using bio-inks. This paper also reviews various biocompatible and biodegradable materials used in recent in-vivo and in-vitro studies. It has been deduced from the study that use of natural fibers in polymers resulted in improved mechanical strength of products. Also, the implementation of additive manufacturing technologies for production of composites would lead to production of customized product.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46636115","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}
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