Pub Date : 2022-12-31DOI: 10.1080/20550324.2023.2168844
Ivan Pešić, M. Petrović, M. Vuksanović, M. Popović, M. Rabasovic, D. Šević, V. Radojević
Abstract Processing and characterization of PMMA-MXene composites were investigated. γ-Methacryloxypropyltrimethoxy (MEMO) silane was used to modify the surface of MXenes and improve the compatibility between MXenes and the polymer. The FTIR analysis revealed the formation of a chemical bond between MXene and MEMO silane, while the XPS analysis confirmed the presence of silicon in the functionalized MXene. PMMA composites with non-functionalized and functionalized MXene were prepared using a solution casting method. Tensile tests showed that, compared to neat PMMA, Young’s modulus increased in both composites by 22.1 and 27.6%, respectively. As a result of coupling between the PMMA matrix and the surface-modified MXenes, the tensile strength also increased by about 37%. In addition, optical spectroscopy showed higher absorption for the composite with surface-modified MXenes and short-lived fluorescence with emission intensity sensitive to the crumpling of functionalized MXene nanosheets. Graphical Abstract
{"title":"Structural, optical, and mechanical characterization of PMMA-MXene composites functionalized with MEMO silane","authors":"Ivan Pešić, M. Petrović, M. Vuksanović, M. Popović, M. Rabasovic, D. Šević, V. Radojević","doi":"10.1080/20550324.2023.2168844","DOIUrl":"https://doi.org/10.1080/20550324.2023.2168844","url":null,"abstract":"Abstract Processing and characterization of PMMA-MXene composites were investigated. γ-Methacryloxypropyltrimethoxy (MEMO) silane was used to modify the surface of MXenes and improve the compatibility between MXenes and the polymer. The FTIR analysis revealed the formation of a chemical bond between MXene and MEMO silane, while the XPS analysis confirmed the presence of silicon in the functionalized MXene. PMMA composites with non-functionalized and functionalized MXene were prepared using a solution casting method. Tensile tests showed that, compared to neat PMMA, Young’s modulus increased in both composites by 22.1 and 27.6%, respectively. As a result of coupling between the PMMA matrix and the surface-modified MXenes, the tensile strength also increased by about 37%. In addition, optical spectroscopy showed higher absorption for the composite with surface-modified MXenes and short-lived fluorescence with emission intensity sensitive to the crumpling of functionalized MXene nanosheets. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"182 1","pages":"215 - 226"},"PeriodicalIF":4.6,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74387867","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 : 2022-08-19DOI: 10.1080/20550324.2022.2106396
Sarabjeet Kaur, Ana Luiza Silveira Fiates, K. Rezwan, M. Wilhelm
Abstract Monometallic (Ni, Co or Fe-SiC(O)) and bimetallic (Ni, Co or FeM-SiC(O) with M = Ni or Co) ceramic nanocomposites have been successfully prepared using polymeric precursors obtained by chemical modification of polycarbosilane with metal acetylacetonate. The nanocomposites consist of homogeneously distributed metal nanoparticles within an amorphous SiC(O). The specific surface area (SSA) of Ni, Co or Fe-SiC(O)600 nanocomposites were found to be 155, 50 or 14 m2/g. However, the addition of Fe to the Ni-or Co-containing precursors tends to increase the SSA to 290 or 170 m2/g. Maximum CO2 conversion for monometallic samples was found to be 40% at 500 °C for Ni-SiC(O)600 and maximum CH4 selectivity was 61% at 300 °C for Co-SiC(O)600. The additional presence of Co and Ni in the respective nanocomposites helps to increase the CO2 conversion and selectivity at 500 °C whereas Fe modification shows high methane selectivity at lower temperature < 350 °C. Graphical Abstract Highlights Novel nanocomposites consist of bimetallic and SiC(O) ceramic with high specific surface area (SSA) for catalytic applications synthesized via polymer-derived route. Homogeneously distributed metal nanoparticles (5–7 nm) within amorphous SiC(O) ceramics. Among monometallic composites, Ni-SiC(O) and Co-SiC(O) show better catalytic results in methanation reaction than Fe-SiC(O). Introduction of second metal (Ni, Co or Fe) into Ni and Co-SiC(O) ceramic nanocomposites enhances the SSA and catalytic activity in methanation reaction. In bimetallic nanocomposites Ni and Co increase the catalytic activity and selectivity whereas Fe helps to improve the selectivity at lower temperature.
摘要用金属乙酰丙酮酸对聚碳硅烷进行化学改性，制备了单金属(Ni、Co或Fe-SiC(O))和双金属(Ni、Co或M = Ni或Co的FeM-SiC(O))陶瓷纳米复合材料。纳米复合材料由均匀分布在非晶SiC(O)中的金属纳米颗粒组成。Ni、Co和Fe-SiC(O)600纳米复合材料的比表面积(SSA)分别为155、50和14 m2/g。然而，在含镍或含钴前驱体中添加铁会使SSA增加到290或170 m2/g。在500℃时，Ni-SiC(O)600对单金属样品的最大CO2转化率为40%，在300℃时，Co-SiC(O)600对CH4的最大选择性为61%。Co和Ni在纳米复合材料中的额外存在有助于在500℃时提高CO2转化率和选择性，而Fe改性在较低温度< 350℃时显示出较高的甲烷选择性。新型纳米复合材料由双金属和具有高比表面积(SSA)的SiC(O)陶瓷组成，通过聚合物衍生的途径合成了具有催化应用的纳米复合材料。非晶SiC(O)陶瓷中均匀分布的金属纳米颗粒(5-7 nm)。在单金属复合材料中，Ni-SiC(O)和Co-SiC(O)在甲烷化反应中的催化效果优于Fe-SiC(O)。在Ni和Co- sic (O)陶瓷纳米复合材料中引入第二金属(Ni、Co或Fe)增强了甲烷化反应的SSA和催化活性。在双金属纳米复合材料中，Ni和Co提高了催化活性和选择性，而Fe则有助于提高低温下的选择性。
{"title":"Monometallic and bimetallic SiC(O) ceramic with Ni, Co and/or Fe nanoparticles for catalytic applications","authors":"Sarabjeet Kaur, Ana Luiza Silveira Fiates, K. Rezwan, M. Wilhelm","doi":"10.1080/20550324.2022.2106396","DOIUrl":"https://doi.org/10.1080/20550324.2022.2106396","url":null,"abstract":"Abstract Monometallic (Ni, Co or Fe-SiC(O)) and bimetallic (Ni, Co or FeM-SiC(O) with M = Ni or Co) ceramic nanocomposites have been successfully prepared using polymeric precursors obtained by chemical modification of polycarbosilane with metal acetylacetonate. The nanocomposites consist of homogeneously distributed metal nanoparticles within an amorphous SiC(O). The specific surface area (SSA) of Ni, Co or Fe-SiC(O)600 nanocomposites were found to be 155, 50 or 14 m2/g. However, the addition of Fe to the Ni-or Co-containing precursors tends to increase the SSA to 290 or 170 m2/g. Maximum CO2 conversion for monometallic samples was found to be 40% at 500 °C for Ni-SiC(O)600 and maximum CH4 selectivity was 61% at 300 °C for Co-SiC(O)600. The additional presence of Co and Ni in the respective nanocomposites helps to increase the CO2 conversion and selectivity at 500 °C whereas Fe modification shows high methane selectivity at lower temperature < 350 °C. Graphical Abstract Highlights Novel nanocomposites consist of bimetallic and SiC(O) ceramic with high specific surface area (SSA) for catalytic applications synthesized via polymer-derived route. Homogeneously distributed metal nanoparticles (5–7 nm) within amorphous SiC(O) ceramics. Among monometallic composites, Ni-SiC(O) and Co-SiC(O) show better catalytic results in methanation reaction than Fe-SiC(O). Introduction of second metal (Ni, Co or Fe) into Ni and Co-SiC(O) ceramic nanocomposites enhances the SSA and catalytic activity in methanation reaction. In bimetallic nanocomposites Ni and Co increase the catalytic activity and selectivity whereas Fe helps to improve the selectivity at lower temperature.","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"10 1","pages":"194 - 203"},"PeriodicalIF":4.6,"publicationDate":"2022-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79168646","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 : 2022-08-05DOI: 10.1080/20550324.2022.2100683
Shouyi Cao, Y. Tao, H. Li, M. Ren, Jinliang Sun
Abstract Due to ever increasing use of telecommunication and electronic devices in offshore and stealth technology sectors, developing highly-efficient electromagnetic interference (EMI) shielding materials with good thermal resistance are urgently required. In this paper, the effect of MWCNTs incorporation on the mechanical, interlaminar bonding and EMI performance of MWCNT/CF/PEEK composites were firstly studied. The introduction of interlaminar MWCNTs did not affect the tensile strength and modulus significantly at low loadings whilst slight decrease in them was seen beyond a MWCNT content of 2.5 g/m2 due to the presence of CNT clusters. Improvement in the flexural strength and modulus as well as interlaminar bonding were achieved, reaching the peak values at an interlaminar MWCNT content of 1.5 g/m2. This is because the existence of inter-ply CNTs improves the stiffness and strength of the interlaminar region in shear when the material is subjected to bending moment. EMI shielding effectiveness of the laminates was markedly enhanced by 76% at an interlaminar CNT content as low as 2.5 g/m2 (equivalent to 0.53 wt.%). For the first time, this work has demonstrated the effectiveness and high efficiency of utilizing a multilayer structural design with the CNTs spray coated at the interlaminar region to improve the EMI shielding performance of CF/PEEK composites. Graphical Abstract
{"title":"Multiscale hybrid CNT and CF reinforced PEEK composites with enhanced EMI properties","authors":"Shouyi Cao, Y. Tao, H. Li, M. Ren, Jinliang Sun","doi":"10.1080/20550324.2022.2100683","DOIUrl":"https://doi.org/10.1080/20550324.2022.2100683","url":null,"abstract":"Abstract Due to ever increasing use of telecommunication and electronic devices in offshore and stealth technology sectors, developing highly-efficient electromagnetic interference (EMI) shielding materials with good thermal resistance are urgently required. In this paper, the effect of MWCNTs incorporation on the mechanical, interlaminar bonding and EMI performance of MWCNT/CF/PEEK composites were firstly studied. The introduction of interlaminar MWCNTs did not affect the tensile strength and modulus significantly at low loadings whilst slight decrease in them was seen beyond a MWCNT content of 2.5 g/m2 due to the presence of CNT clusters. Improvement in the flexural strength and modulus as well as interlaminar bonding were achieved, reaching the peak values at an interlaminar MWCNT content of 1.5 g/m2. This is because the existence of inter-ply CNTs improves the stiffness and strength of the interlaminar region in shear when the material is subjected to bending moment. EMI shielding effectiveness of the laminates was markedly enhanced by 76% at an interlaminar CNT content as low as 2.5 g/m2 (equivalent to 0.53 wt.%). For the first time, this work has demonstrated the effectiveness and high efficiency of utilizing a multilayer structural design with the CNTs spray coated at the interlaminar region to improve the EMI shielding performance of CF/PEEK composites. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"60 1","pages":"184 - 193"},"PeriodicalIF":4.6,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79891555","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 : 2022-07-22DOI: 10.1080/20550324.2022.2055374
Meiying He, Pingmei Wang, Peiwen Xiao, X. Jia, Jian-hui Luo, Bo Jiang, B. Xiao
Abstract In this study, amphiphilic Janus nanoparticles with dumbbell-like structure have been synthesized by connecting two silica nanospheres with differential wettability. In this method, silica nanospheres were modified to be hydrophobic and hydrophilic respectively and then the nanospheres with different wettability were covalently connected together on a one-to-one basis simply by chemical bonds generating between surface groups. The dumbbell-like structure of particles can be observed clearly under scanning electron microscope and transmittance electron microscope. Results showed that 58% of the nanospheres were successfully coupled to build the dumbbell-like structure. Since these anisotropic nanoparticles were based entirely on inorganic materials and owned well-defined surface areas of different wettability, they may have a highly potential for many application fields such as optical and electrical engineering. Graphical Abstract
{"title":"Synthesis of amphiphilic dumbbell-like Janus nanoparticles through one-step coupling","authors":"Meiying He, Pingmei Wang, Peiwen Xiao, X. Jia, Jian-hui Luo, Bo Jiang, B. Xiao","doi":"10.1080/20550324.2022.2055374","DOIUrl":"https://doi.org/10.1080/20550324.2022.2055374","url":null,"abstract":"Abstract In this study, amphiphilic Janus nanoparticles with dumbbell-like structure have been synthesized by connecting two silica nanospheres with differential wettability. In this method, silica nanospheres were modified to be hydrophobic and hydrophilic respectively and then the nanospheres with different wettability were covalently connected together on a one-to-one basis simply by chemical bonds generating between surface groups. The dumbbell-like structure of particles can be observed clearly under scanning electron microscope and transmittance electron microscope. Results showed that 58% of the nanospheres were successfully coupled to build the dumbbell-like structure. Since these anisotropic nanoparticles were based entirely on inorganic materials and owned well-defined surface areas of different wettability, they may have a highly potential for many application fields such as optical and electrical engineering. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"285 1","pages":"175 - 183"},"PeriodicalIF":4.6,"publicationDate":"2022-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85236520","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 : 2022-06-24DOI: 10.1080/20550324.2022.2091340
P. Huynh, G. Nguyen, Khanh Thi Le Tran, Thu Minh Ho, V. Lam, M. Bown, Thanh Vo Ke Ngo
Abstract Antibacterial foam dressing has been developed in recent years based on polymeric membranes and silver ions or silver nanoparticles as antibacterial components. However, silver ions or silver nanoparticles have cytotoxicity to humans. Herein, we used biocompatible multi-branched gold nanoparticles as an antimicrobial agent in polyurethane foam wound dressings. This study described a rapid and surfactant-free method for the preparation of multi-branched gold nanoparticles using hydroquinone as a reducing agent and chitosan as a stabilizer as well as assisted irradiation. The optimal procedure of polyurethane foam fabricated with high water absorption and small average pore size, achieved nearly 500% of absorptivity and 98 nm of pore size. The antibacterial effects of the multi-branched gold nanoparticles containing polyurethane foam against both Escherichia coli and Staphylococcus aureus were investigated. The results demonstrated that multi-branched gold nanoparticles can be used as a viable alternative to conventional antibiotics in wound dressings. Graphical Abstract
{"title":"Study on green preparation of multi-branched gold nanoparticles loaded flexible polyurethane foam for antibacterial dressing","authors":"P. Huynh, G. Nguyen, Khanh Thi Le Tran, Thu Minh Ho, V. Lam, M. Bown, Thanh Vo Ke Ngo","doi":"10.1080/20550324.2022.2091340","DOIUrl":"https://doi.org/10.1080/20550324.2022.2091340","url":null,"abstract":"Abstract Antibacterial foam dressing has been developed in recent years based on polymeric membranes and silver ions or silver nanoparticles as antibacterial components. However, silver ions or silver nanoparticles have cytotoxicity to humans. Herein, we used biocompatible multi-branched gold nanoparticles as an antimicrobial agent in polyurethane foam wound dressings. This study described a rapid and surfactant-free method for the preparation of multi-branched gold nanoparticles using hydroquinone as a reducing agent and chitosan as a stabilizer as well as assisted irradiation. The optimal procedure of polyurethane foam fabricated with high water absorption and small average pore size, achieved nearly 500% of absorptivity and 98 nm of pore size. The antibacterial effects of the multi-branched gold nanoparticles containing polyurethane foam against both Escherichia coli and Staphylococcus aureus were investigated. The results demonstrated that multi-branched gold nanoparticles can be used as a viable alternative to conventional antibiotics in wound dressings. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"27 1","pages":"167 - 174"},"PeriodicalIF":4.6,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85843503","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 : 2022-06-22DOI: 10.1080/20550324.2022.2090050
I. Anshori, Komang Arya Attyla Kepakisan, Lavita Nuraviana Rizalputri, Raih Rona Althof, Antonius Eko Nugroho, R. Siburian, M. Handayani
Abstract Dopamine concentration abnormalities in the body can cause various disorders and diseases such as Parkinson's, Tourette's syndrome, and depression. In this study, graphene oxide (GO) was combined with Fe3O4 to sensitively and selectively detect dopamine. The performance was evaluated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. The results of testing with CV on the solution [Fe(CN)6] showed that a modification with GO gave a maximum effective surface area value of 0.0127 cm2, proving that GO can increase the effective area and conductivity of the sensor. DPV testing shows that dopamine detection using GO/Fe3O4 has a linear range at a concentration of 1–10 μM with a detection limit of 0.48 μM and a quantification limit of 1.6 μM. GO/Fe3O4 also shows good selectivity where the peak current is separated by 0.245 V with ascorbic acid, which is the closest interference compound. Graphical Abstract
{"title":"Facile synthesis of graphene oxide/Fe3O4 nanocomposite for electrochemical sensing on determination of dopamine","authors":"I. Anshori, Komang Arya Attyla Kepakisan, Lavita Nuraviana Rizalputri, Raih Rona Althof, Antonius Eko Nugroho, R. Siburian, M. Handayani","doi":"10.1080/20550324.2022.2090050","DOIUrl":"https://doi.org/10.1080/20550324.2022.2090050","url":null,"abstract":"Abstract Dopamine concentration abnormalities in the body can cause various disorders and diseases such as Parkinson's, Tourette's syndrome, and depression. In this study, graphene oxide (GO) was combined with Fe3O4 to sensitively and selectively detect dopamine. The performance was evaluated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods. The results of testing with CV on the solution [Fe(CN)6] showed that a modification with GO gave a maximum effective surface area value of 0.0127 cm2, proving that GO can increase the effective area and conductivity of the sensor. DPV testing shows that dopamine detection using GO/Fe3O4 has a linear range at a concentration of 1–10 μM with a detection limit of 0.48 μM and a quantification limit of 1.6 μM. GO/Fe3O4 also shows good selectivity where the peak current is separated by 0.245 V with ascorbic acid, which is the closest interference compound. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"34 1","pages":"155 - 166"},"PeriodicalIF":4.6,"publicationDate":"2022-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89491654","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 : 2022-06-15DOI: 10.1080/20550324.2022.2086775
C. S. Castro Issasi, Rodolfo Morales Ibarra, M. Sasaki
Abstract Currently, the combination between metal nanoparticles and polymers have gathered some attention, especially in the case of a polymer like poly(N-Isopropylacrylamide) (PNIPAM) which is a temperature-responsive polymer that changes from hydrophilic to hydrophobic at around 32 °C. This property together with the innate properties of silver nanoparticles (e.g. thermal and antimicrobial activity) poses an interesting option for a nanocomposite that can be used as drug carrier, tissue scaffold, and many other biomedical applications. In-situ synthesis performed by pulsed discharges has barely been reported nor has been fully researched. In this work, in-situ synthesis was performed by variating the ratio of NIPAM and silver nitrate solution, resulting in square shaped nanoparticles with sizes in the range of 50 to 500 nm distributed in the polymer matrix and sphere-shaped nanoparticles entangled in the polymer matrix. These results demonstrate an interesting and novel synthesis process for nanomaterial composites with future biomedical applications. Graphical Abstract
{"title":"In situ synthesis of poly(N-isopropylacrylamide) decorated with silver nanoparticles using pulsed electrical discharge in contact with water interface","authors":"C. S. Castro Issasi, Rodolfo Morales Ibarra, M. Sasaki","doi":"10.1080/20550324.2022.2086775","DOIUrl":"https://doi.org/10.1080/20550324.2022.2086775","url":null,"abstract":"Abstract Currently, the combination between metal nanoparticles and polymers have gathered some attention, especially in the case of a polymer like poly(N-Isopropylacrylamide) (PNIPAM) which is a temperature-responsive polymer that changes from hydrophilic to hydrophobic at around 32 °C. This property together with the innate properties of silver nanoparticles (e.g. thermal and antimicrobial activity) poses an interesting option for a nanocomposite that can be used as drug carrier, tissue scaffold, and many other biomedical applications. In-situ synthesis performed by pulsed discharges has barely been reported nor has been fully researched. In this work, in-situ synthesis was performed by variating the ratio of NIPAM and silver nitrate solution, resulting in square shaped nanoparticles with sizes in the range of 50 to 500 nm distributed in the polymer matrix and sphere-shaped nanoparticles entangled in the polymer matrix. These results demonstrate an interesting and novel synthesis process for nanomaterial composites with future biomedical applications. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"91 1","pages":"136 - 141"},"PeriodicalIF":4.6,"publicationDate":"2022-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81579051","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 : 2022-06-06DOI: 10.1080/20550324.2022.2086776
Sukanda Vaewbundit, P. Siriphannon
Abstract Crosslinked chitosan/iron oxide nanocomposites (CC/IO) were synthesized at low temperatures using aqueous systems, i.e. hydrothermal and refluxing methods. The CC templates derived from various concentrations of tripolyphosphate crosslinker were used as host materials. The Fe2+ and Fe3+ ions with 1:2 molar ratio were adsorbed into the CC templates by the swelling, allowing to form CC/Fe2+Fe3+ precursors. The CC/IO nanocomposites were created by treating the precursors in NaOH solution using hydrothermal and refluxing methods. The CC/IO nanocomposites contained magnetite-maghemite nanocrystals with quadrilateral shape of 10 − 14 nm embedded in the CC templates. Superparamagnetism was obtained in the CC/IO nanocomposites, which had maximum magnetization (Mmax) values ranging from 8.6 to 15.2 emu/g and coercivity and magnetic remanence values close to zero. The cell viability of CC/IO nanocomposites ranged from 80 to 89%, demonstrating high safety for mammal. The CC/IO nanocomposites were considered to be potential superparamagenetic candidates for alternative medical applications. Graphical Abstract
{"title":"Soft solution growth of magnetite-maghemite nanocrystals in crosslinked chitosan templates and their superparamagnetic properties","authors":"Sukanda Vaewbundit, P. Siriphannon","doi":"10.1080/20550324.2022.2086776","DOIUrl":"https://doi.org/10.1080/20550324.2022.2086776","url":null,"abstract":"Abstract Crosslinked chitosan/iron oxide nanocomposites (CC/IO) were synthesized at low temperatures using aqueous systems, i.e. hydrothermal and refluxing methods. The CC templates derived from various concentrations of tripolyphosphate crosslinker were used as host materials. The Fe2+ and Fe3+ ions with 1:2 molar ratio were adsorbed into the CC templates by the swelling, allowing to form CC/Fe2+Fe3+ precursors. The CC/IO nanocomposites were created by treating the precursors in NaOH solution using hydrothermal and refluxing methods. The CC/IO nanocomposites contained magnetite-maghemite nanocrystals with quadrilateral shape of 10 − 14 nm embedded in the CC templates. Superparamagnetism was obtained in the CC/IO nanocomposites, which had maximum magnetization (Mmax) values ranging from 8.6 to 15.2 emu/g and coercivity and magnetic remanence values close to zero. The cell viability of CC/IO nanocomposites ranged from 80 to 89%, demonstrating high safety for mammal. The CC/IO nanocomposites were considered to be potential superparamagenetic candidates for alternative medical applications. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"86 1","pages":"142 - 154"},"PeriodicalIF":4.6,"publicationDate":"2022-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78597313","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 : 2022-05-20DOI: 10.1080/20550324.2022.2080348
Kanyapak Silakaew, P. Thongbai
Abstract Silver (Ag) nanoparticles deposited sub–micro sized BaTiO3 particles (µBT) were fabricated as hybrid particles (Ag@µBT) to promote the dielectric response in a poly(vinylidene fluoride) (PVDF). The dielectric constant (ε′) of the Ag@µBT/PVDF composites continuously increased as the volume fraction (f Ag@ µ BT) increased, while the loss tangent (tanδ) was effectively suppressed. The ε′∼173.49 was obtained in the composite with f Ag@ µ BT=0.49, while a low tanδ was achieved (0.024), which was close to 0.021 for the PVDF. The Ag@µBT hybrid particles played essential roles in increased ε′ and inhibited conductive pathways, resulting in a low tanδ. The ε′ increased slightly, whereas tanδ changed significantly over the measured temperature range. Furthermore, ε′ was fitted with the effective medium percolation theory model. Therefore, the significantly improved dielectric properties were attributed to the high ε′ value of the µBT phase and interfacial polarization between the conductive Ag and insulating phases (i.e. µBT and PVDF). Graphical Abstract
{"title":"Silver nanoparticles–deposited sub-micro sized BaTiO3/PVDF composites: greatly increased enhanced constant and effectively suppressed dielectric loss","authors":"Kanyapak Silakaew, P. Thongbai","doi":"10.1080/20550324.2022.2080348","DOIUrl":"https://doi.org/10.1080/20550324.2022.2080348","url":null,"abstract":"Abstract Silver (Ag) nanoparticles deposited sub–micro sized BaTiO3 particles (µBT) were fabricated as hybrid particles (Ag@µBT) to promote the dielectric response in a poly(vinylidene fluoride) (PVDF). The dielectric constant (ε′) of the Ag@µBT/PVDF composites continuously increased as the volume fraction (f Ag@ µ BT) increased, while the loss tangent (tanδ) was effectively suppressed. The ε′∼173.49 was obtained in the composite with f Ag@ µ BT=0.49, while a low tanδ was achieved (0.024), which was close to 0.021 for the PVDF. The Ag@µBT hybrid particles played essential roles in increased ε′ and inhibited conductive pathways, resulting in a low tanδ. The ε′ increased slightly, whereas tanδ changed significantly over the measured temperature range. Furthermore, ε′ was fitted with the effective medium percolation theory model. Therefore, the significantly improved dielectric properties were attributed to the high ε′ value of the µBT phase and interfacial polarization between the conductive Ag and insulating phases (i.e. µBT and PVDF). Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"89 1","pages":"125 - 135"},"PeriodicalIF":4.6,"publicationDate":"2022-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79568687","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 : 2022-05-10DOI: 10.1080/20550324.2022.2076025
C. Du, Wei Huang
Abstract Hydrogels are hydrophilic polymers with high flexibility and elasticity, and are widely used in the field of bone tissue engineering. However, their low toughness and insufficient mechanical strength have limited their applications. Nanocomposite hydrogels are flexible and porous as well as possess excellent biocompatibility and mechanical strength, thus exhibiting a significant potential to be used in the field of bone tissue engineering. Nanocomposite hydrogels are synthesized by chemically or physically crosslinking nanomaterials and hydrogels, and their physical, chemical, and biological properties can be enhanced by changing the properties and compositions of the nanomaterials. Both nanomaterials and hydrogel polymers can be customized, and therefore, nanocomposite hydrogels can be developed for bone repair under different conditions. In this review, we first introduce the synthesis methods and properties of nanocomposite hydrogels, and then summarize the applications and progress of nanocomposite hydrogels in bone tissue engineering. Graphical Abstract Nanocomposite hydrogels are used in bone tissue engineering. Adapted from Huang et al. (2019) [121]
{"title":"Progress and prospects of nanocomposite hydrogels in bone tissue engineering","authors":"C. Du, Wei Huang","doi":"10.1080/20550324.2022.2076025","DOIUrl":"https://doi.org/10.1080/20550324.2022.2076025","url":null,"abstract":"Abstract Hydrogels are hydrophilic polymers with high flexibility and elasticity, and are widely used in the field of bone tissue engineering. However, their low toughness and insufficient mechanical strength have limited their applications. Nanocomposite hydrogels are flexible and porous as well as possess excellent biocompatibility and mechanical strength, thus exhibiting a significant potential to be used in the field of bone tissue engineering. Nanocomposite hydrogels are synthesized by chemically or physically crosslinking nanomaterials and hydrogels, and their physical, chemical, and biological properties can be enhanced by changing the properties and compositions of the nanomaterials. Both nanomaterials and hydrogel polymers can be customized, and therefore, nanocomposite hydrogels can be developed for bone repair under different conditions. In this review, we first introduce the synthesis methods and properties of nanocomposite hydrogels, and then summarize the applications and progress of nanocomposite hydrogels in bone tissue engineering. Graphical Abstract Nanocomposite hydrogels are used in bone tissue engineering. Adapted from Huang et al. (2019) [121]","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":"21 1","pages":"102 - 124"},"PeriodicalIF":4.6,"publicationDate":"2022-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86971462","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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