One-step synthesis of biocompatible magnetite/silk fibroin core–shell nanoparticles

Sheng, Weiqin; Liu, Jing; Liu, Shanshan; Lü, Qiang; Kaplan, David L.; Zhu, Hesun

doi:10.1039/c4tb01125b

Cited by 31 publications

(23 citation statements)

References 63 publications

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“…The tyrosine residues in SF macromolecular chains can provide strong interactions with Fe (III) [33, 34], making silk-Fe complexes possible in different reaction systems. Compared to previous reported silk fibroin materials, silk fibroin nanofiber with increased negative potential provided stronger interactions with positive charged Fe (III) [35] to form silk-Fe nanofiber complexes. Then the silk-Fe nanofiber complexes are hydrolyzed into FeOOH during the hydrothermal process, and the FeOOH nanoparticles are further dehydrated to transform into olive-like α-Fe 2 O 3 , accompanied by the reassembly and aggregation process to reduce the system energy.…”

Section: Resultsmentioning

confidence: 90%

Silk-regulated hierarchical hollow magnetite/carbon nanocomposite spheroids for lithium-ion battery anodes

et al. 2015

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Hierarchical olive-like structured carbon-Fe3O4 nanocomposite particles composed of a hollow interior and a carbon coated surface are prepared by a facile, silk protein-assisted hydrothermal method. Silk nanofibers as templates and carbon precursors first regulate the formation of hollow Fe2O3 microspheres and then they are converted into carbon in a reduction process into Fe3O4. This process significantly simplifies the fabrication and carbon coating processes to form complex hollow structures. When tested as anode materials for lithium-ion batteries, these hollow carbon-coated particles exhibite high capacity (900 mAh g−1), excellent cycle stability (180 cycles) and rate performance due to their unique hierarchical hollow structure and carbon coating.

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Section: Resultsmentioning

confidence: 90%

Silk-regulated hierarchical hollow magnetite/carbon nanocomposite spheroids for lithium-ion battery anodes

et al. 2015

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“…Then the complex was used to regulate porous Fe 2 O 3 nanorod formation. FeCl 3 was simultaneously added to form rGO‐SF fiber‐Fe 3+ complexes and transformed into rGO/FeOOH nanorods via a hydrolysis process . The final porous N‐rGO/Fe 2 O 3 nanorods were then obtained after the annealing in argon at 400 °C for 5 h, where rGO/SF was carbonized into nitrogen‐doped graphene and amorphous carbon simultaneously.…”

Section: Resultsmentioning

confidence: 99%

“…It also could be transformed into amorphours carbon after calcination to facilitate electrical conductivity and alleviated pulverization of the magnetite materials in anodes . However, only limited shapes were achieved when using SF as a template because of its poor controbility in aqueous solution . Here, SF nanofibers adhered on the rGO sheets to reinforce the pluripotency in aqueous solution, achieving the composites containing N‐rGO, Fe 2 O 3 porous nanorods, and amorphous carbon.…”

Section: Resultsmentioning

confidence: 99%

“…Unfortunately, similar with other soft templates, the high motility of SF templates in aqueous environments weakened control. Until now, the morphology of metal oxide nanomaterials prepared with SF as a template were restricted to limited shapes (e.g., olive, almond) . Unlike soft templates, solid templates possess superior control for the products formed, but are usually 2D systems.…”

Section: Introductionmentioning

confidence: 99%

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Metal Oxide Nanomaterials with Nitrogen‐Doped Graphene‐Silk Nanofiber Complexes as Templates

Sheng

Zhu

Lü

et al. 2016

Part & Part Syst Charact

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performance, and rate capability of current LIBs are not suffi cient to fully meet the demands for other emerging applications, such as electric vehicles and green energy grids. [4][5][6][7] Possible breakthroughs in LIBs with superior electrochemical performance depend in large part on the development of new electrochemically active electrode materials. Thus, the exploitation of different anode materials with high capacity is of strong interest. Among high-capacity anode materials, metal oxides are particularly attractive due to their high theoretical capacity, low toxicity, and low cost. [8][9][10] Nevertheless, metal oxide anode materials for LIBs usually suffer from rapid capacity decay during cycling and poor rate performance due to their intrinsically low conductivity, large volume expansion during lithiation, and the formation of a thick solid electrolyte interface (SEI). [ 8,11 ] To circumvent these obstacles, several strategies have been developed to engineer new metal oxide materials with special nanostructures as suitable matrices for enhancing LIBs. [ 8,12 ] Although the above problems can be alleviated by using these approaches, the challenge remains to achieve metal oxide anodes with superior capacity and stability for applications in electric vehicles. Recent studies suggest a promising trend in the formation of anode materials with superior performance based on the combination of nanostructure and nanocomposite strategies. [ 13,14 ] In this respect, graphene was used to fabricate hybrid nanomaterials with improved electrochemical performance due to its superior electric conductivity, good mechanical fl exibility, and high chemical stability. [ 15,16 ] Although some impressive improvements were observed, some disadvantages for lithium storage remain with these hybrids, including undesired aggregation during the cycle processes. [ 17 ] Further design and fabrication of these nanocomposites as well as nanostructures are needed to achieve metal oxide-based anodes with superior performance.Various natural materials with specifi c nanostructures have attractive properties as synthetic templates in nanotechnology to regulate the synthesis of metal oxides with desired nanostructures. [ 18 ] These materials can also stabilize nanosized metal oxide materials as matrices to restrain aggregation and then be transformed into amorphous carbon by annealing to further improve electrochemical stability of the products. Silk fi broin (SF), a high molecular weight amphiphilic protein polymer, has been successfully used to prepare different nanomaterials when used as a template.

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“…Polyampholytes, carrying anionic and cationic groups on a polymer backbone, have attracted widespread interest because of their more desired solution properties and wider applications in various fields of biotechnology and medicine 1. Until now, amphoteric polyacrylamide (AmPAM) has been prepared by at least three methods: solution polymerization,2–5 microemulsion polymerization,6 and dispersion polymerization 7,8. Owing to its inherent simplicity of the single‐step process, dispersion polymerization is a unique method producing particles in the range of 0.1–15 μm 9.…”

Section: Introductionmentioning

confidence: 99%

Effect of Reaction Conditions on the Particle Morphology of Aqueous Dispersion of Poly(acrylamide‐acrylatedimethylaminoethyl methacrylate methyl chloride)

Hu¹,

Zhang²,

Liu³

et al. 2012

Adv Polym Technol

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Amphoteric polyacrylamide was prepared by dispersion polymerization with acrylamide, dimethylaminoethyl methacrylate methyl chloride, and acrylate acid as monomers, ammonium sulfate (AS) aqueous solution as a reaction medium, poly(dimethylaminoethyl methacrylate methyl chloride) (PDMC) as a stabilizer, and 2,2 -azobis(2-amidinopropane) dihydrochloride as an initiator. The influence of particle morphology on AmPAM dispersion and other factors and polymerization were investigated. Three crucial factors responsible for particle morphology are the dispersant concentration, sodium chloride concentration, and ionic degree of terpolymer. The ammonium sulfate concentration had relatively less of an effect on particle morphology, but a suitable concentration was necessary to obtain a stable dispersion system. A Correspondence

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One-step synthesis of biocompatible magnetite/silk fibroin core–shell nanoparticles

Abstract: Core–shell Fe3O4/SF nanoparticles, prepared by silk fibroin in one step, could be widely used in biomedical areas, such as contrast agents and targets with some surface modification.

Cited by 31 publications

References 63 publications

Silk-regulated hierarchical hollow magnetite/carbon nanocomposite spheroids for lithium-ion battery anodes

Silk-regulated hierarchical hollow magnetite/carbon nanocomposite spheroids for lithium-ion battery anodes

Metal Oxide Nanomaterials with Nitrogen‐Doped Graphene‐Silk Nanofiber Complexes as Templates

Effect of Reaction Conditions on the Particle Morphology of Aqueous Dispersion of Poly(acrylamide‐acrylatedimethylaminoethyl methacrylate methyl chloride)

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