Pub Date : 2020-01-02DOI: 10.1080/20550324.2019.1708634
Sajjad Azizi, Jafar Soleymani, M. Hasanzadeh
Abstract KCC-1/Pr-SO3H is found to be a considerable efficient nanocatalyst for the one-pot three-component condensation coupling of aromatic aldehydes, isatoic anhydride, and primary amines for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones in ethanol as a green solvent under reflux conditions with excellent yields. The influence of different reaction parameters such as the effects of solvent, temperature, time, and concentration of catalyst for the synthesis of 2,3-dihydroquinazolin-4(1H)-one (4f) were studied. KCC-1/Pr-SO3H is easily recyclable without the significant loss of catalytic activities after seven times. This mild and simple synthesis method offers some worthwhile advantages including short reaction time, high yield, and convenient work-up procedure. Graphical Abstract
{"title":"KCC-1/Pr-SO3H: an efficient heterogeneous catalyst for green and one-pot synthesis of 2,3-dihydroquinazolin-4(1H)-one","authors":"Sajjad Azizi, Jafar Soleymani, M. Hasanzadeh","doi":"10.1080/20550324.2019.1708634","DOIUrl":"https://doi.org/10.1080/20550324.2019.1708634","url":null,"abstract":"Abstract KCC-1/Pr-SO3H is found to be a considerable efficient nanocatalyst for the one-pot three-component condensation coupling of aromatic aldehydes, isatoic anhydride, and primary amines for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones in ethanol as a green solvent under reflux conditions with excellent yields. The influence of different reaction parameters such as the effects of solvent, temperature, time, and concentration of catalyst for the synthesis of 2,3-dihydroquinazolin-4(1H)-one (4f) were studied. KCC-1/Pr-SO3H is easily recyclable without the significant loss of catalytic activities after seven times. This mild and simple synthesis method offers some worthwhile advantages including short reaction time, high yield, and convenient work-up procedure. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"20 5 1","pages":"31 - 40"},"PeriodicalIF":4.6,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91225723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-02DOI: 10.1080/20550324.2019.1705592
M. Haghshenas, M. Gupta
Abstract Magnesium (Mg), as the lightest metallic material, is 33% lighter than aluminum which makes it, potentially, a great replacement for aluminum and its alloys. However, Mg in pure and alloyed conditions is brittle at ambient temperature which largely limits their applications. One key solution to enhance the strength and ductility of Mg and its alloys is to embed thermally-stable nano-size reinforcements within the Mg matrix to produce so-called “Mg nanocomposites”. The Mg nanocomposites are considering revolutionizing energy-saving lightweight materials of the future with enhanced strength and ductility properties. Mg nanocomposites are, however, at the initial degrees of improvement and consequently, systematic research is required to set up microstructure/property relationships at distinct potential conditions (i.e. temperatures and strain rates). In the present study, a nanoindentation testing approach is adopted to assess ambient-temperature small scale mechanical properties of a group of Mg nanocomposites reinforced with rare-earth element nanoparticles (NPs), i.e. Sm2O3. This paper tried to assess various nanoindentation-driven properties of the Mg-Sm2O3 nanocomposites and compare them with the pure Mg as the baseline. Graphical Abstract
{"title":"Magnesium nanocomposites reinforced with rare earth element nanoparticles: nanoindentation-driven response","authors":"M. Haghshenas, M. Gupta","doi":"10.1080/20550324.2019.1705592","DOIUrl":"https://doi.org/10.1080/20550324.2019.1705592","url":null,"abstract":"Abstract Magnesium (Mg), as the lightest metallic material, is 33% lighter than aluminum which makes it, potentially, a great replacement for aluminum and its alloys. However, Mg in pure and alloyed conditions is brittle at ambient temperature which largely limits their applications. One key solution to enhance the strength and ductility of Mg and its alloys is to embed thermally-stable nano-size reinforcements within the Mg matrix to produce so-called “Mg nanocomposites”. The Mg nanocomposites are considering revolutionizing energy-saving lightweight materials of the future with enhanced strength and ductility properties. Mg nanocomposites are, however, at the initial degrees of improvement and consequently, systematic research is required to set up microstructure/property relationships at distinct potential conditions (i.e. temperatures and strain rates). In the present study, a nanoindentation testing approach is adopted to assess ambient-temperature small scale mechanical properties of a group of Mg nanocomposites reinforced with rare-earth element nanoparticles (NPs), i.e. Sm2O3. This paper tried to assess various nanoindentation-driven properties of the Mg-Sm2O3 nanocomposites and compare them with the pure Mg as the baseline. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"6 1","pages":"22 - 30"},"PeriodicalIF":4.6,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85315774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-02DOI: 10.1080/20550324.2019.1699229
S. Doshi, Tyler B. Lyness, E. Thostenson
Abstract Improving mechanical properties and decreasing costs have significantly increased the use of fiber composites in automotive, aerospace, and civil engineering applications. Structural composites are bonded to traditional metallic materials in a variety of applications, and mechanical fasteners often cannot be used due to the low bearing strength of composites. With the increasing use of adhesives in load-bearing structures, novel techniques are required for monitoring the structural integrity of adhesive joints. Previously, carbon nanotubes (CNTs) have been added to adhesives and resins to create in-situ sensors, but the increased viscosity and potential for galvanic corrosion remains a challenge. In this research, a piezoresistive carbon nanotube-based sensing layer is embedded in a composite/steel adhesive joint for damage sensing. The use of a thin sensing layer with low-fiber volume fraction enables the use of existing adhesives without causing any major changes in the physical properties of the adhesives or the curing cycle and reduces the chances of galvanic corrosion. Different approaches of using an adhesive layer and a nonconductive fabric are investigated for insulation of the sensing layer. The nonconductive fabric approach for insulating the specimen yields better mechanical properties as the there are no weak interfaces in the adhesive bondline. Additionally, it is more convenient for scaling up for field applications as the adhesive is cured in one stage. The sensing layer can not only be used to detect incipient damage in the joint, but also identify different modes of failure. Graphical Abstract
{"title":"Damage monitoring of adhesively bonded composite-metal hybrid joints using carbon nanotube-based sensing layer","authors":"S. Doshi, Tyler B. Lyness, E. Thostenson","doi":"10.1080/20550324.2019.1699229","DOIUrl":"https://doi.org/10.1080/20550324.2019.1699229","url":null,"abstract":"Abstract Improving mechanical properties and decreasing costs have significantly increased the use of fiber composites in automotive, aerospace, and civil engineering applications. Structural composites are bonded to traditional metallic materials in a variety of applications, and mechanical fasteners often cannot be used due to the low bearing strength of composites. With the increasing use of adhesives in load-bearing structures, novel techniques are required for monitoring the structural integrity of adhesive joints. Previously, carbon nanotubes (CNTs) have been added to adhesives and resins to create in-situ sensors, but the increased viscosity and potential for galvanic corrosion remains a challenge. In this research, a piezoresistive carbon nanotube-based sensing layer is embedded in a composite/steel adhesive joint for damage sensing. The use of a thin sensing layer with low-fiber volume fraction enables the use of existing adhesives without causing any major changes in the physical properties of the adhesives or the curing cycle and reduces the chances of galvanic corrosion. Different approaches of using an adhesive layer and a nonconductive fabric are investigated for insulation of the sensing layer. The nonconductive fabric approach for insulating the specimen yields better mechanical properties as the there are no weak interfaces in the adhesive bondline. Additionally, it is more convenient for scaling up for field applications as the adhesive is cured in one stage. The sensing layer can not only be used to detect incipient damage in the joint, but also identify different modes of failure. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"123 1","pages":"12 - 21"},"PeriodicalIF":4.6,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74110501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-02DOI: 10.1080/20550324.2019.1687174
J. Rogalski, Han Zhang, Jian Yao, C. Bastiaansen, T. Peijs
Abstract The production of high-modulus and high-strength polymer nanofibers using centrifugal or rotary jet spinning (RJS) was explored. Co-polyimide nanofibers based on 3,3′,4,4′-biphenyl-tetracarboxylic dianhydride (BPDA)/p-phenylenediamine (PDA)/4,4′-oxydianiline (ODA) (BPO) were successfully spun by RJS from a polyamic acid precursor solution before conversion into highly oriented and chain extended BPO co-polyimide fibers via an imidization step. Fourier transform infrared (FTIR) characterization was used to evaluate the chemical conversion of the fibers. Nanocomposite laminates based on co-polyimide nonwoven fiber mats in epoxy were manufactured for mechanical testing. Analysis using the generalized rule of mixtures resulted in a back-calculated fiber modulus and strength of around 50 and 2 GPa, approaching that of high-performance fibers like Kevlar® 29, and equaling those of co-polyimide fibers obtained via electrospinning, making them the strongest centrifugal spun fibers ever reported. Graphical Abstract
{"title":"High-modulus rotary jet spun co-polyimide nanofibers and their composites","authors":"J. Rogalski, Han Zhang, Jian Yao, C. Bastiaansen, T. Peijs","doi":"10.1080/20550324.2019.1687174","DOIUrl":"https://doi.org/10.1080/20550324.2019.1687174","url":null,"abstract":"Abstract The production of high-modulus and high-strength polymer nanofibers using centrifugal or rotary jet spinning (RJS) was explored. Co-polyimide nanofibers based on 3,3′,4,4′-biphenyl-tetracarboxylic dianhydride (BPDA)/p-phenylenediamine (PDA)/4,4′-oxydianiline (ODA) (BPO) were successfully spun by RJS from a polyamic acid precursor solution before conversion into highly oriented and chain extended BPO co-polyimide fibers via an imidization step. Fourier transform infrared (FTIR) characterization was used to evaluate the chemical conversion of the fibers. Nanocomposite laminates based on co-polyimide nonwoven fiber mats in epoxy were manufactured for mechanical testing. Analysis using the generalized rule of mixtures resulted in a back-calculated fiber modulus and strength of around 50 and 2 GPa, approaching that of high-performance fibers like Kevlar® 29, and equaling those of co-polyimide fibers obtained via electrospinning, making them the strongest centrifugal spun fibers ever reported. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"116 1","pages":"1 - 11"},"PeriodicalIF":4.6,"publicationDate":"2020-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86080553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-02DOI: 10.1080/20550324.2019.1681623
Sajjad Azizi, N. Shadjou, M. Hasanzadeh
Abstract In this study, a novel approach has been used for the efficient synthesis of tetrahydrodipyrazolopyridine derivatives (5a–m) via a four-component one-pot condensation reaction of aromatic aldehydes, hydrazinehydrate, ethyl acetoacetate, and ammonium acetate in the presence of KCC-1-npr-NH2-DPA as an advanced nano-catalyst in ethanol under reflux conditions at 30 min. For this purpose, mesoporous fibrous nano-silica functionalized by dipenicillamine as a novel nanocatalyst (KCC-1-npr-NH2-DPA) was synthesized using a hydrothermal protocol. KCC-1-npr-NH2-DPA nano-catalyst is easily recyclable eight times without the considerable loss of catalytic activity. Other remarkable features include the short reaction time, simple work-up procedure and providing excellent yields (89–98%) of the products under mild reaction conditions. Furthermore, the effects of solvent, concentration of catalyst, time and temperature for the synthesis of tetrahydrodipyrazolopyridine (5a) were studied. Graphical Abstract
{"title":"KCC-1-NH2-DPA: an efficient heterogeneous recyclable nanocomposite for the catalytic synthesis of tetrahydrodipyrazolopyridines as a well-known organic scaffold in various bioactive derivatives","authors":"Sajjad Azizi, N. Shadjou, M. Hasanzadeh","doi":"10.1080/20550324.2019.1681623","DOIUrl":"https://doi.org/10.1080/20550324.2019.1681623","url":null,"abstract":"Abstract In this study, a novel approach has been used for the efficient synthesis of tetrahydrodipyrazolopyridine derivatives (5a–m) via a four-component one-pot condensation reaction of aromatic aldehydes, hydrazinehydrate, ethyl acetoacetate, and ammonium acetate in the presence of KCC-1-npr-NH2-DPA as an advanced nano-catalyst in ethanol under reflux conditions at 30 min. For this purpose, mesoporous fibrous nano-silica functionalized by dipenicillamine as a novel nanocatalyst (KCC-1-npr-NH2-DPA) was synthesized using a hydrothermal protocol. KCC-1-npr-NH2-DPA nano-catalyst is easily recyclable eight times without the considerable loss of catalytic activity. Other remarkable features include the short reaction time, simple work-up procedure and providing excellent yields (89–98%) of the products under mild reaction conditions. Furthermore, the effects of solvent, concentration of catalyst, time and temperature for the synthesis of tetrahydrodipyrazolopyridine (5a) were studied. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"39 1","pages":"124 - 132"},"PeriodicalIF":4.6,"publicationDate":"2019-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83074773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-09-30DOI: 10.1080/20550324.2019.1671038
Tim B van Erp, C. Reynolds, E. Bilotti, T. Peijs
Abstract Isotactic polypropylene (i-PP) – montmorillonite (MMT) nanocomposite films were prepared by melt-compounding and hot-pressing. The influence of organoclays on the mechanical properties and drawability of these isotropic composite films was investigated. Ultimate properties of solid-state drawn PP tapes incorporating 2.5 wt% MMT outperformed those of pure PP tapes. Interestingly, these improvements were found not to be the result of a mechanical reinforcement effect of the nanoclay platelets but merely the result of a more efficient ultra-drawing mechanism with MMT acting as a processing additive that altered initial polymer morphology and drawing behaviour. Hence, the introduction of MMT resulted in higher ultimate draw ratios and subsequently higher ultimate mechanical properties of the oriented nanocomposite tapes. Graphical Abstract
{"title":"Nanoclay assisted ultra-drawing of polypropylene tapes","authors":"Tim B van Erp, C. Reynolds, E. Bilotti, T. Peijs","doi":"10.1080/20550324.2019.1671038","DOIUrl":"https://doi.org/10.1080/20550324.2019.1671038","url":null,"abstract":"Abstract Isotactic polypropylene (i-PP) – montmorillonite (MMT) nanocomposite films were prepared by melt-compounding and hot-pressing. The influence of organoclays on the mechanical properties and drawability of these isotropic composite films was investigated. Ultimate properties of solid-state drawn PP tapes incorporating 2.5 wt% MMT outperformed those of pure PP tapes. Interestingly, these improvements were found not to be the result of a mechanical reinforcement effect of the nanoclay platelets but merely the result of a more efficient ultra-drawing mechanism with MMT acting as a processing additive that altered initial polymer morphology and drawing behaviour. Hence, the introduction of MMT resulted in higher ultimate draw ratios and subsequently higher ultimate mechanical properties of the oriented nanocomposite tapes. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"69 1","pages":"114 - 123"},"PeriodicalIF":4.6,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90576795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-09-30DOI: 10.1080/20550324.2019.1669897
Pei Yang, Ke Tian, Xiancheng Ren, Kai Zhou
Abstract In this work, XLPE/MWCNT and XLPE/CB nanocomposites have been prepared in order to investigate AC electric field and water effects on electrical aging of XLPE. The mechanical, AC breakdown strength and AC conductivity were tested and the morphologies after 30 days electrical aging were observed using an optical microscope. The results showed that all samples exhibit excellent insulation properties and mechanical properties. Compared with CB addition, the MWCNT composites exhibit better resistance to electrical aging, with the length of electrical aging-induced microcracks in the MWCNT blends decreasing from 104 to 22 µm, and the width decreasing from 87 to 17 µm, which means a reduction of ∼80% compared of values for neat XLPE in both length and width. However, the XLPE/CB composites have a tendency to promote electrical aging. The mechanism is revealed by comparing the results of the fibrous MWCNTs with the spherical CBs. Graphical Abstract
{"title":"A comparative study of electrical aging of multiwalled carbon nanotubes and carbon black filled cross-linked polyethylene","authors":"Pei Yang, Ke Tian, Xiancheng Ren, Kai Zhou","doi":"10.1080/20550324.2019.1669897","DOIUrl":"https://doi.org/10.1080/20550324.2019.1669897","url":null,"abstract":"Abstract In this work, XLPE/MWCNT and XLPE/CB nanocomposites have been prepared in order to investigate AC electric field and water effects on electrical aging of XLPE. The mechanical, AC breakdown strength and AC conductivity were tested and the morphologies after 30 days electrical aging were observed using an optical microscope. The results showed that all samples exhibit excellent insulation properties and mechanical properties. Compared with CB addition, the MWCNT composites exhibit better resistance to electrical aging, with the length of electrical aging-induced microcracks in the MWCNT blends decreasing from 104 to 22 µm, and the width decreasing from 87 to 17 µm, which means a reduction of ∼80% compared of values for neat XLPE in both length and width. However, the XLPE/CB composites have a tendency to promote electrical aging. The mechanism is revealed by comparing the results of the fibrous MWCNTs with the spherical CBs. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"42 1","pages":"103 - 95"},"PeriodicalIF":4.6,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77648527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-09-26DOI: 10.1080/20550324.2019.1669925
Nilufar Khantan, N. Shadjou, M. Hasanzadeh
Abstract l-Cysteine-modified dendritic fibrous nanosilica grafted by amine groups (Cys-DFNS-NH2) have been synthesized by a novel hydrothermal method. The N2 adsorption–desorption isotherms analysis on the Cys-DFNS-NH2 show that the average pore volume and surface area of the prepared fibrous Cys-DFNS-NH2 were 2.2 cm3/g and 205 m2/g, respectively, while the average pore size is 6.06 nm. Adsorption behavior of the Cys-DFNS-NH2 for Cd2+, Cu2+, Ag+, and Pb2+ was investigated by electrochemical methods. The results show that Cys-DFNS-NH2 can selectively adsorb Cd2+, Ag+, and Pb2+ in different potentials. Finally, the application of the engineered adsorbent for the removal of Cd2+, Ag+, and Pb2+ from contaminated water samples was examined. This work provides a new platform to the synthesis of Cys-DFNS-NH2 with high specific surface area for efficient adsorbent of specific metal ions. Graphical Abstract
{"title":"Synthesize of dendritic fibrous nano-silica functionalized by cysteine and its application as advanced adsorbent","authors":"Nilufar Khantan, N. Shadjou, M. Hasanzadeh","doi":"10.1080/20550324.2019.1669925","DOIUrl":"https://doi.org/10.1080/20550324.2019.1669925","url":null,"abstract":"Abstract l-Cysteine-modified dendritic fibrous nanosilica grafted by amine groups (Cys-DFNS-NH2) have been synthesized by a novel hydrothermal method. The N2 adsorption–desorption isotherms analysis on the Cys-DFNS-NH2 show that the average pore volume and surface area of the prepared fibrous Cys-DFNS-NH2 were 2.2 cm3/g and 205 m2/g, respectively, while the average pore size is 6.06 nm. Adsorption behavior of the Cys-DFNS-NH2 for Cd2+, Cu2+, Ag+, and Pb2+ was investigated by electrochemical methods. The results show that Cys-DFNS-NH2 can selectively adsorb Cd2+, Ag+, and Pb2+ in different potentials. Finally, the application of the engineered adsorbent for the removal of Cd2+, Ag+, and Pb2+ from contaminated water samples was examined. This work provides a new platform to the synthesis of Cys-DFNS-NH2 with high specific surface area for efficient adsorbent of specific metal ions. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"46 1","pages":"104 - 113"},"PeriodicalIF":4.6,"publicationDate":"2019-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82154800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-03DOI: 10.1080/20550324.2019.1647687
Yezhou Yang, W. Cheng, B. Yin, Ming‐bo Yang
Abstract Surface modification was needed in the application of nanoparticles. In this work, a simple method was proposed to prepare polymer coatings on reduced graphene oxide (rGO) sheets. A polymer coating of plasma polymethyl methacrylate (pPMMA) was synthesized on the surface of rGO by plasma polymerization using dielectric barrier discharge plasma equipment. There was good adhesion between the pPMMA coating and the surface of rGO. Furthermore, the pPMMA coating consisted of two layers classified by their interactions with rGO:pPMMA in the outer layer physically adhered to the surface and pPMMA of the under layer interacted with rGO by chemical bonding. The thicknesses of the outer and under layers were 1.5–3 nm and 2–3.5 nm, respectively. Moreover, the morphology and thickness of pPMMA coatings could be effectively regulated by controlling the input voltage and processing time. The process of the deposition of pPMMA coating was preliminarily studied and discussed in this work. We believed that this strategy could open up an avenue for the surface modification of other kinds of nanoparticles.
{"title":"Facile preparation of polymer coating on reduced graphene oxide sheets by plasma polymerization","authors":"Yezhou Yang, W. Cheng, B. Yin, Ming‐bo Yang","doi":"10.1080/20550324.2019.1647687","DOIUrl":"https://doi.org/10.1080/20550324.2019.1647687","url":null,"abstract":"Abstract Surface modification was needed in the application of nanoparticles. In this work, a simple method was proposed to prepare polymer coatings on reduced graphene oxide (rGO) sheets. A polymer coating of plasma polymethyl methacrylate (pPMMA) was synthesized on the surface of rGO by plasma polymerization using dielectric barrier discharge plasma equipment. There was good adhesion between the pPMMA coating and the surface of rGO. Furthermore, the pPMMA coating consisted of two layers classified by their interactions with rGO:pPMMA in the outer layer physically adhered to the surface and pPMMA of the under layer interacted with rGO by chemical bonding. The thicknesses of the outer and under layers were 1.5–3 nm and 2–3.5 nm, respectively. Moreover, the morphology and thickness of pPMMA coatings could be effectively regulated by controlling the input voltage and processing time. The process of the deposition of pPMMA coating was preliminarily studied and discussed in this work. We believed that this strategy could open up an avenue for the surface modification of other kinds of nanoparticles.","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"1 1","pages":"74 - 83"},"PeriodicalIF":4.6,"publicationDate":"2019-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76808564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-07-03DOI: 10.1080/20550324.2019.1637576
H. Al-Salihi, A. Mahmood, H. Al-alkawi
Abstract An attempt was made to synthesize aluminum alloy (AA) 7075 matrix reinforced with 0, 1, 3, 5 wt% Al2O3 particulates by using stir casting technique. Mechanical properties and wear behavior were examined. The hardness and tensile properties were obtained before and after addition of Al2O3 particulates to reveal the extent improvement. Wear behavior was examined by using a pin-on-disc device to validate the improvement of the wear resistance. The results showed that adding of Al2O3 reinforcement were significantly enhanced the mechanical properties. The ultimate tensile strength (UTS) and yield tensile strength (YTS) were observed 133 MPa, 35 MPa for the unfilled aluminum matrix, whereas 152 MPa and 47 MPA were achieved at 5 wt% Al2O3 nanocomposites which resulted in 14.3 and 34.3% improvement, respectively. The hardness was observed 57 BHN and 72 BHN at 0 wt% and 5 wt% Al2O3 respectively, resulting in an improvement of 26.3%.
{"title":"Mechanical and wear behavior of AA7075 aluminum matrix composites reinforced by Al2O3 nanoparticles","authors":"H. Al-Salihi, A. Mahmood, H. Al-alkawi","doi":"10.1080/20550324.2019.1637576","DOIUrl":"https://doi.org/10.1080/20550324.2019.1637576","url":null,"abstract":"Abstract An attempt was made to synthesize aluminum alloy (AA) 7075 matrix reinforced with 0, 1, 3, 5 wt% Al2O3 particulates by using stir casting technique. Mechanical properties and wear behavior were examined. The hardness and tensile properties were obtained before and after addition of Al2O3 particulates to reveal the extent improvement. Wear behavior was examined by using a pin-on-disc device to validate the improvement of the wear resistance. The results showed that adding of Al2O3 reinforcement were significantly enhanced the mechanical properties. The ultimate tensile strength (UTS) and yield tensile strength (YTS) were observed 133 MPa, 35 MPa for the unfilled aluminum matrix, whereas 152 MPa and 47 MPA were achieved at 5 wt% Al2O3 nanocomposites which resulted in 14.3 and 34.3% improvement, respectively. The hardness was observed 57 BHN and 72 BHN at 0 wt% and 5 wt% Al2O3 respectively, resulting in an improvement of 26.3%.","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"25 1","pages":"67 - 73"},"PeriodicalIF":4.6,"publicationDate":"2019-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87606309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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