High quality self-assembly magnetite (Fe3O4) chain-like core-shell nanowires with luminescence synthesized by a facile one-pot hydrothermal process

Gong, Jun-Yan; Li, Sanzhong; Zhang, Dongen; Zhang, Xiaobo; Liu, Chao; Tong, Zhiwei

doi:10.1039/c002199g

Cited by 60 publications

(37 citation statements)

References 32 publications

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“…The high resolution TEM image shown in Fig. 2B illustrates the well-ordered lattice fringes with 0.485 nm spacing, which corresponded to the (1 1 1) plane of Fe 3 O 4 [33]. The remaining carbon coating layer and background were derived from PVP, which was not fully decomposed.…”

Section: Synthesis and Characterization Of Tri-functional Microparticlesmentioning

confidence: 99%

Tri-functionality of Fe3O4-embedded carbon microparticles in microalgae harvesting

Seo

Lee

Praveenkumar

et al. 2015

Chemical Engineering Journal

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Section: Synthesis and Characterization Of Tri-functional Microparticlesmentioning

confidence: 99%

Tri-functionality of Fe3O4-embedded carbon microparticles in microalgae harvesting

Seo

Lee

Praveenkumar

et al. 2015

Chemical Engineering Journal

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“…Pertinent targets include the synthesis of materials that have desirable anisotropic properties for electronic and optical devices. [6][7][8][9] As this is a difficult task, different techniques have been employed including magnetic-field-induced (MFI) assembly, [10][11][12][13][14][15][16] electric or magnetic dipole-dipole interactions, [17][18][19][20] crystallographically specific orientation, [21] non-uniform stabilizer distribution, [22] templated synthesis [23,24] to produce 1D nanostructured materials. However, an elegant approach would be to construct 1D chains consisting of structurally intricate units and functions.…”

mentioning

confidence: 99%

“…The alignment of the PLL aggregates containing MNP and HPTS along the direction of the applied magnetic field with simultaneous cross-linking by GA results in 1D aligned MFS structures ( Figure 2). The aligned MFS are prepared at various R values (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) as shown in the Supporting Information ( Figure S6 and Table S1) with R = 10 as the optimum condition used for evaluation of their properties.…”

mentioning

confidence: 99%

Tailored Anisotropic Magnetic Chain Structures Hierarchically Assembled from Magnetoresponsive and Fluorescent Components

2011

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The development of methods for controlling the organization of functional objects at a nanometer scale to build larger objects is of fundamental and technological interest. The unique electronic, magnetic, and optical properties of nanomaterials will be best utilized when they are well integrated into larger devices. [1][2][3][4][5] A great deal of research is focused on such materials, particularly those with magnetic properties that can be exploited for the fabrication of ordered onedimensional (1D) chainlike assemblies. Pertinent targets include the synthesis of materials that have desirable anisotropic properties for electronic and optical devices. [6][7][8][9] As this is a difficult task, different techniques have been employed including magnetic-field-induced (MFI) assembly, [10][11][12][13][14][15][16] electric or magnetic dipole-dipole interactions, [17][18][19][20] crystallographically specific orientation, [21] non-uniform stabilizer distribution, [22] templated synthesis [23,24] to produce 1D nanostructured materials. However, an elegant approach would be to construct 1D chains consisting of structurally intricate units and functions. Suitable methods are still required to prepare aligned structures from nanoparticles suspended in an aqueous medium and to allow multifunctional properties to be imparted into such directional structures in a way that allows these additional properties to evaluated and exploited.Herein, we describe a method that provides opportunities for synthesizing materials that not only have a preferred 1D structure but that are also multifunctional. The strategy involves both designing and utilizing nanobuilding blocks to be linked together to generate aligned materials with anisotropic morphology and multifunctional properties. In the first step we assemble preformed nanoparticles (NPs) into a confined structure by using positively charged polypeptides as interparticle mediators while preserving the constituent nanoparticles functional properties. We have shown that the cationic polypeptides can undergo counterion condensation to form spherical aggregates by ionic cross-linking with either certain multivalent counteranions or nanoparticles which are capped with anionic species. [25,26] The unique aggregation characteristics of these polycation-anion systems means that multiple nanoparticles can spontaneously assemble into microstructures. [27,28] We have further shown that functionalities can also be integrated to give catalytic and optical properties. [29,30] Herein, our approach is to use poly(l-lysine) (PLL) to cross-link with hydroxy pyrene trisulfonate (HPTS) and citrate-functionalized magnetic nanoparticles (MNPs) to afford magneto responsive fluorescent spheres (MFS). In a second step these spheres are magnetically aligned by virtue of magnetic dipole interactions to construct 1D anisotropic shapes.HPTS is a pyrene-based molecule and has been proved to be a versatile probe molecule in both chemistry and biology. [31] The ability of HPTS, as an anionic multiple-point cross-li...

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“…All of detected diffraction peaks can be indexed as spinel magnetite, which is in good agreement with standard literature data (JCPDF card number: 86-1354), (Gong et al 2010). These sharp diffraction peaks clearly revealed that spinel magnetite product is well defined crystallites, with no impurity diffraction peaks, indicating a pure phase of synthesized magnetite nanoparticles.…”

Section: Preparation and Characterization Of Fe3o4@nh2-sio2 Nanopartimentioning

confidence: 77%

Immobilization of cyclodextrin glucanotransferase on aminopropyl-functionalized silica-coated superparamagnetic nanoparticles

Ibrahim

Al‐Salamah

El‐Toni

et al. 2013

Electron. J. Biotechnol.

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Background: Cyclodextrin glycosyltransferase (CGTase) from Amphibacillus sp. NPST-10 was successfully covalently immobilized on aminopropyl-functionalized silica coated superparamagnetic nanoparticles; and the properties of immobilized enzyme were investigated. The synthesis process included preparing of core magnetic magnetite (Fe3O4) nanoparticles using solvothermal synthesis; followed by coating of Fe3O4 nanoparticles with dense amino-functionalized silica (NH2-SiO2) layer using in situ functionalization method. The structure of synthesized Fe3O4@NH2-SiO2 nanoparticles was characterized using TEM, XRD, and FT-IR analysis. Fe3O4@NH2-SiO2 nanoparticles were further activated by gluteraaldehyde as bifunctional cross linker, and the activated nanoparticles were used for CGTase immobilization by covalent attachment. Results: Magnetite nanoparticles was successfully synthesized and coated with and amino functionalized silica layer (Fe3O4/NH2-SiO2), with particle size of 50-70 nm. The silica coated magnetite nanoparticles showed with saturation magnetization of 65 emug -1 , and can be quickly recovered from the bulk solution using an external magnet within 10 sec. The activated support was effective for CGTase immobilization, which was confirmed by comparison of FT-IR spectra of free and immobilized enzyme. The applied approach for support preparation, activation, and optimization of immobilization conditions, led to high yields of CGTase immobilization (92.3%), activity recovery (73%), and loading efficiency (95.2%); which is one of the highest so far reported for CGTase. Immobilized enzyme showed shift in the optimal temperature from 50 to 55ºC, and significant enhancement in the thermal stability compared with free enzyme. The optimum pH for enzyme activity was pH 8 and pH 7.5 for free and immobilized CGTase, respectively, with slight improvement of pH stability of immobilized enzyme. Furthermore, kinetic studies revealed that immobilized CGTase had higher affinity toward substrate; with km values of 1.18 ± 0.05 mg/ml and 1.75 ± 0.07 mg/ml for immobilized and free CGTase, respectively. Immobilized CGTase retained 87% and 67 of its initial activity after 5 and 10 repeated batches reaction, indicating that immobilized CGTase on Fe3O4/NH2-SiO2 had good durability and magnetic recovery. Conclusion: The improvement in kinetic and stability parameters of immobilized CGTase makes the proposed method a suitable candidate for industrial applications of CGTase. To best of our knowledge, this is the first report about CGTase immobilization on silica coated magnetite nanoparticles.

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High quality self-assembly magnetite (Fe3O4) chain-like core-shell nanowires with luminescence synthesized by a facile one-pot hydrothermal process

Cited by 60 publications

References 32 publications

Tri-functionality of Fe3O4-embedded carbon microparticles in microalgae harvesting

Tri-functionality of Fe3O4-embedded carbon microparticles in microalgae harvesting

Tailored Anisotropic Magnetic Chain Structures Hierarchically Assembled from Magnetoresponsive and Fluorescent Components

Immobilization of cyclodextrin glucanotransferase on aminopropyl-functionalized silica-coated superparamagnetic nanoparticles

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