Nanocomposites最新文献_第9页

Effect of heat treatment on the microstructural properties of silica embedded cobalt ferrite nanocomposites 热处理对二氧化硅包埋钴铁氧体纳米复合材料微观组织性能的影响

IF 4.6 3区材料科学

Nanocomposites Pub Date : 2020-12-18 DOI: 10.1080/20550324.2020.1865711

M. Bansal, D. Ahlawat, Amrik Singh, Vijay Kumar, S. P. Rathee

{"title":"Effect of heat treatment on the microstructural properties of silica embedded cobalt ferrite nanocomposites","authors":"M. Bansal, D. Ahlawat, Amrik Singh, Vijay Kumar, S. P. Rathee","doi":"10.1080/20550324.2020.1865711","DOIUrl":"https://doi.org/10.1080/20550324.2020.1865711","url":null,"abstract":"Abstract Silica coated cobalt ferrite (CoFe2O4:SiO2) nanocomposites were synthesized by co-precipitation technique using metal nitrates as precursors. The as-prepared samples were heat treated at different temperatures of 250, 500 and 750 °C for 24 h. Structural, thermal, and morphological behavior of nanocomposites are investigated by XRD, FTIR, TGA-DTG, and SEM characterization results, useful in biomedical applications. With increasing calcinations temperature from 250 to 500 °C and 750 °C an increase in crystallite size of CoFe2O4:SiO2 nanocomposites has been determined from 20.26 to 28.95 nm and 38.76 nm by Williamson–Hall method, respectively. Furthermore, by increasing the temperature from 250 to 750 °C the lattice parameter and strain values have been found to increase from 8.0321 to 8.0691 Å and 1.01 × 10−2 to 3.75 × 10−3, respectively. Analysis of TGA results found no weight loss when the sample was heated beyond 700 °C and thus complete decomposition of precursors has led to the formation of stable nanocomposite structures at high temperatures. SEM analysis of synthesized samples at 750 °C revealed well developed nanoparticles of CoFe2O4: SiO2 with inter-granular porosity. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2020-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77908047","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}

引用次数: 4

Synthesis of imidazoles promoted by H3PW12O40-amino-functionalized CdFe12O19@SiO2 nanocomposite h3pw12o40 -氨基功能化CdFe12O19@SiO2纳米复合材料促进咪唑的合成

IF 4.6 3区材料科学

Nanocomposites Pub Date : 2020-12-07 DOI: 10.1080/20550324.2020.1858246

J. Safaei‐Ghomi, Ali Kareem Abbas, Marzieh Shahpiri

引用次数: 4

Fabrication of cartilage/natural rubber latex biocomposites derived from human mesenchymal stem cells in hypoxia 人间充质干细胞制备软骨/天然胶乳生物复合材料

IF 4.6 3区材料科学

Nanocomposites Pub Date : 2020-11-18 DOI: 10.1080/20550324.2020.1851438

Y. Okamoto, M. Kinoshita, M. Okamoto

引用次数: 2

Investigating the effect of surface modification on the dispersion process of polymer nanocomposites 研究了表面改性对聚合物纳米复合材料分散过程的影响

IF 4.6 3区材料科学

Nanocomposites Pub Date : 2020-08-27 DOI: 10.1080/20550324.2020.1809250

A. Prasad, Yixing Wang, Xiaolin Li, Akshay Iyer, Wei Chen, L. Brinson, L. Schadler

{"title":"Investigating the effect of surface modification on the dispersion process of polymer nanocomposites","authors":"A. Prasad, Yixing Wang, Xiaolin Li, Akshay Iyer, Wei Chen, L. Brinson, L. Schadler","doi":"10.1080/20550324.2020.1809250","DOIUrl":"https://doi.org/10.1080/20550324.2020.1809250","url":null,"abstract":"Abstract Achieving controlled nanoparticle dispersion through melt processing has been challenging as processing-structure rules for polymer nanocomposites are still not well-defined. This work focuses on developing a quantitative understanding of the filler–matrix compatibility and melt mixing parameters on the dispersion of nanoparticles. Filler-matrix compatibility was varied by surface modification of silica nanoparticles. A twin screw extruder was used to prepare the nanocomposites and TEM imaging and image analysis were used to quantitively characterize the microstructure. It was found that matrix–filler compatibility strongly affected the method of agglomerate breakdown and dispersion. Under similar conditions, compatible systems tended to disperse via rupture of agglomerates while incompatible systems were found to disperse via erosion. A map was created to predict the dispersion mechanism as a function of processing conditions and system compatibility and systems from this study and literature were found to be in good agreement with the map. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86583417","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}

引用次数: 13

“Polylactic acid-polyethylene glycol-hydroxyapatite composite” an efficient composition for interference screws “聚乳酸-聚乙二醇-羟基磷灰石复合材料”一种高效的干涉螺杆组合物

IF 4.6 3区材料科学

Nanocomposites Pub Date : 2020-07-21 DOI: 10.1080/20550324.2020.1794688

Fatemeh Nedaipour, H. Bagheri, S. Mohammadi

{"title":"“Polylactic acid-polyethylene glycol-hydroxyapatite composite” an efficient composition for interference screws","authors":"Fatemeh Nedaipour, H. Bagheri, S. Mohammadi","doi":"10.1080/20550324.2020.1794688","DOIUrl":"https://doi.org/10.1080/20550324.2020.1794688","url":null,"abstract":"Abstract Interference screws are commonly used for the treatment of ruptured ligaments. The interference screws are often constructed from polylactic acid (PLA). In this study, a melt blend of PLA, polyethylene glycol (PEG) and hydroxyapatite (HA) was investigated for use in interference screws. For this purpose, mechanical properties, differential scanning calorimetry (DSC), degradation rate, pH change, water contact angle, morphology, cytotoxicity, and cell adhesion on the specimens were investigated. According to the tensile test results, by mixing various levels of PLA, PEG, and HA, mechanical properties of the resulting composite can be kept constant or even improved in comparison with pure PLA. DSC proved the miscibility of components and provided a softer product after adding PEG to the mixture. The weight loss of samples was investigated over a period of 7 months and the results indicated an increase in the degradation rate by increasing PEG level. pH changes were also investigated indicating no significant change in pH. The contact angle test showed an increase in the hydrophilic nature of all specimens with increasing PEG and HA levels. Surface morphology was studied by scanning electron microscope (SEM) and the results showed an increase in toughness with increasing PEG level. 2 µm HA particles and HA agglomeration in some areas were clearly observed in the SEM micrographs. According to the MTT test, none of the samples caused cell death, and results also showed good and spread cell adhesion to the specimens. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2020-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75966167","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}

引用次数: 14

Structure and properties of thermomechanically processed silk peptide and nanoclay filled chitosan 热机械加工丝肽和纳米粘土填充壳聚糖的结构与性能

IF 4.6 3区材料科学

Nanocomposites Pub Date : 2020-07-02 DOI: 10.1080/20550324.2020.1820796

Pei Chen, Fengwei Xie, F. Tang, T. McNally

引用次数: 9

Functionalization of electrospun PLA fibers using amphiphilic block copolymers for use in carboxy-methyl-cellulose hydrogel composites 用两亲嵌段共聚物功能化电纺PLA纤维用于羧基甲基纤维素水凝胶复合材料

IF 4.6 3区材料科学

Nanocomposites Pub Date : 2020-06-26 DOI: 10.1080/20550324.2020.1784600

Xi Zhang, W. Megone, T. Peijs, J. Gautrot

{"title":"Functionalization of electrospun PLA fibers using amphiphilic block copolymers for use in carboxy-methyl-cellulose hydrogel composites","authors":"Xi Zhang, W. Megone, T. Peijs, J. Gautrot","doi":"10.1080/20550324.2020.1784600","DOIUrl":"https://doi.org/10.1080/20550324.2020.1784600","url":null,"abstract":"Abstract Carboxy-methyl-cellulose (CMC) hydrogels, prepared in the presence of a crosslinker and photoinitiator, were reinforced with 3.7 wt% electrospun PLA fibers to create CMC hydrogel composites. To improve fiber-matrix adhesion, electrospun fiber mats based on hybrids of PLA and amphiphilic block copolymer (BCP) poly(D,L-lactide)-block-poly[2-(dimethylamino)ethyl methacrylate] (PLA-b-PDMAEMA) were produced. The presence of PDMAEMA at the fiber surface induced hydrophilic surface properties, which could be controlled by varying the PDMAEMA chain length. PDMAEMA was quaternized and co-electrospun with PLA fibers, which further enhanced the interaction between fibers and hydrogel matrix via ionic interactions. Physicochemical properties of the electrospun fiber mats and their CMC hydrogel based composites were assessed and revealed a nearly two orders of magnitude increase in modulus. Continuous electrospun fiber mats were chopped into discontinuous fibers to create short fiber reinforced CMC hydrogels. Rheological properties of these reinforced hydrogels incorporating 0.5 wt% discontinuous fibers were evaluated and showed potential as injectable composite systems for biomedical applications. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2020-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76357589","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}

引用次数: 8

Efficient removal of digoxin from aqueous solution using magnetic nanocomposite (Fe3O4–GO–SO3H) as an advanced nano-absorbent 磁性纳米复合材料(Fe3O4-GO-SO3H)作为高级纳米吸附剂对地高辛的高效去除

IF 4.6 3区材料科学

Nanocomposites Pub Date : 2020-04-02 DOI: 10.1080/20550324.2020.1776493

Paria Pashazadeh-Panahi, M. Hasanzadeh

引用次数: 5

Sonosynthesis of pyranochromenes and biscoumarins catalyzed by Co3O4/NiO@GQDs@SO3H nanocomposite Co3O4/NiO@GQDs@SO3H纳米复合材料催化吡喃铬烯和双香豆素的超声合成

IF 4.6 3区材料科学

Nanocomposites Pub Date : 2020-04-02 DOI: 10.1080/20550324.2020.1776492

H. Shahbazi-Alavi, Ali Kareem Abbas, J. Safaei‐Ghomi

{"title":"Sonosynthesis of pyranochromenes and biscoumarins catalyzed by Co3O4/NiO@GQDs@SO3H nanocomposite","authors":"H. Shahbazi-Alavi, Ali Kareem Abbas, J. Safaei‐Ghomi","doi":"10.1080/20550324.2020.1776492","DOIUrl":"https://doi.org/10.1080/20550324.2020.1776492","url":null,"abstract":"Abstract Co3O4/NiO@GQDs@SO3H nanocatalyst has been used as an effective catalyst for the preparation of dihydropyrano[3,2-c]chromenes and biscoumarins under ultrasonic irradiations in ethanol. The catalyst has been characterized by FT-IR, XRD, SEM, EDS, BET, TGA, XPS and VSM. Atom economy, reusable catalyst, low catalyst loading, applicability to a wide range of substrates, high yields of products, and applying the sonochemical methodology as an efficient method and innocuous means of activation in synthetic chemistry for the preparation of medicinally privileged heterocyclic molecules are some of the substantial features of this method. The present catalytic procedure is extensible to a wide diversity of substrates for the synthesis of a variety-oriented library of pyranochromene and biscoumarins. The ultrasound approach decreases times, increases yields of products by creating the activation energy in micro surroundings. Meanwhile, this recoverable catalyst will provide a regular platform for heterogeneous catalysis, green chemistry, and environmentally benign protocols in the near future. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87077754","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}

引用次数: 3

Effects of Al2O3 nanoparticles volume fractions on microstructural and mechanical characteristics of friction stir welded nanocomposites Al2O3纳米颗粒体积分数对搅拌摩擦焊接纳米复合材料组织和力学性能的影响

IF 4.6 3区材料科学

Nanocomposites Pub Date : 2020-04-02 DOI: 10.1080/20550324.2020.1776504

T. Singh, S. Tiwari, D. Shukla

{"title":"Effects of Al2O3 nanoparticles volume fractions on microstructural and mechanical characteristics of friction stir welded nanocomposites","authors":"T. Singh, S. Tiwari, D. Shukla","doi":"10.1080/20550324.2020.1776504","DOIUrl":"https://doi.org/10.1080/20550324.2020.1776504","url":null,"abstract":"Abstract The objective of the present study is to investigate the effect of Al2O3 nanoparticles volume percentage on tribological, mechanical and microstructural characteristics of 6061-T6 aluminum alloy based particulate-nanocomposite (P-NCs) fabricated using friction stir welding (FSW) process. Optical microscopy (OM) and scanning electron microscopy (SEM) was employed to evaluate the (a) microstructures of the produced nanocomposites to ascertain the distribution of Al2O3 nanoparticles in the nugget zone; (b) nanocomposite depth formed on Al-alloy matrix, and (c) fractured and wear characteristics. Results reveal that the produced P-NCs had a depth of 3286 µm across the perpendicular x-section of the weld nugget zone of P-NCs. With the increase in a volume percentage of Al2O3 nanoparticles there was a tremendous increment in the microhardness up to 125 HV which is higher than as-received AA6061-T6. It was also noticed that the tensile strength and the wear resistance of produced P-NCs were significantly increased at 0.3 vol% of Al2O3 nanoparticles as compared to 0.2 and 0.4 vol%. The corresponding mechanical and wear properties results were correlated to microstructure and fractography results. Graphical Abstract","PeriodicalId":18872,"journal":{"name":"Nanocomposites","volume":null,"pages":null},"PeriodicalIF":4.6,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90675749","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}

引用次数: 24