Continuous synthesis of hedgehog-like Ag–ZnO nanoparticles in a two-stage microfluidic system

Tao, Shuxia; Yang, Mei; Chen, Huihui; Ren, Mingyue; Chen, Guangwen

doi:10.1039/c6ra06101j

Cited by 26 publications

(14 citation statements)

References 44 publications

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“…13,14 To solve these problems, microreactor is oen used to prepare nanoparticles for the reactant can be well mixed in a limited space, and the nucleation and ageing behavior can be separated immediately. [14][15][16][17] Different from the traditional LDH particles prepared by coprecipitation method, the anisotropy of LDH nanosheets allows their use as ideal 2D quantum systems for studying fundamental physics, or as building blocks for functional materials. [18][19][20][21][22][23] The delamination of LDHs has been widely reported.…”

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confidence: 99%

Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

et al. 2017

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confidence: 99%

Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

et al. 2017

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“…00-036-1451 [ 35 , 36 , 37 ]. The peaks which appeared at 29.8°, 40°, 42.4° can be attributed to the presence of Zn(OH) 2 (or hydroxylated ZnO NPs) phase [ 38 , 39 ], while the peak centered at 34.9° is assigned to the (311) Miller plane of iron oxide nanoparticles [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

“…Powder XRD was carried out on obtained ZnOFe particles, as shown in Figure 1 [35][36][37]. The peaks which appeared at 29.8°, 40°, 42.4° can be attributed to the presence of Zn(OH)2 (or hydroxylated ZnO NPs) phase [38,39], while the peak centered at 34.9° is assigned to the (311) Miller plane of iron oxide nanoparticles [40]. The structure and the morphology of the ZnOFe nanoparticles as well as the ZnOFe-TLL nanoparticles were revealed by atomic force microscopy (AFM).…”

Section: Characterization Of Znofe and Znofe-tll Nanoparticlesmentioning

confidence: 99%

Green Synthesized Magnetic Nanoparticles as Effective Nanosupport for the Immobilization of Lipase: Application for the Synthesis of Lipophenols

et al. 2021

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In this work, hybrid zinc oxide–iron oxide (ZnOFe) magnetic nanoparticles were synthesized employing Olea europaea leaf aqueous extract as a reducing/chelating and capping medium. The resulting magnetic nanoparticles were characterized by basic spectroscopic and microscopic techniques, namely, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), fourier-transform infrared (FTIR) and atomic force microscopy (AFM), exhibiting a spherical shape, average size of 15–17 nm, and a functionalized surface. Lipase from Thermomyces lanuginosus (TLL) was efficiently immobilized on the surface of ZnOFe nanoparticles through physical absorption. The activity of immobilized lipase was found to directly depend on the enzyme to support the mass ratio, and also demonstrated improved pH and temperature activity range compared to free lipase. Furthermore, the novel magnetic nanobiocatalyst (ZnOFe-TLL) was applied to the preparation of hydroxytyrosyl fatty acid esters, including derivatives with omega-3 fatty acids, in non-aqueous media. Conversion yields up to 90% were observed in non-polar solvents, including hydrophobic ionic liquids. Different factors affecting the biocatalyst performance were studied. ZnOFe-TLL was reutilized for eight subsequent cycles, exhibiting 90% remaining esterification activity (720 h of total operation at 50 °C). The green synthesized magnetic nanoparticles, reported here for the first time, are excellent candidates as nanosupports for the immobilization of enzymes with industrial interest, giving rise to nanobiocatalysts with elevated features.

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“…Furthermore, with the observed effects of shell thickness on the photocatalyst effectiveness, it is reasonable to expect that flow-synthesized nanoparticles would be more effective than those synthesized in batch due to improved control over the Cu 2 O shell thickness. Using a similar microfluidic system, Tao et al [105] also synthesized "hedgehog-like" Ag-ZnO core-shell nanoparticles, where Ag nanoprisms served as nucleation sites for the growth of ZnO nanorods with a total residence time of 75.8 s (batch residence time > 1 h). In the first step, the Ag nanoprisms were synthesized by combining two aqueous solutions, one containing silver(I) nitrate, trisodium citrate, sodium dodecyl sulfate, and H 2 O 2 , while the second contained NaBH 4 (pH adjusted to 10-12 using NaOH).…”

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confidence: 99%

Microfluidic Synthesis of Semiconductor Materials: Toward Accelerated Materials Development in Flow

Campbell

Bateni

Volk

et al. 2020

Part & Part Syst Charact

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Semiconductors are intriguing due to their unique electrical properties, particularly the behavior of their electrons in the presence of different stimuli (e.g., electric field, magnetic field, light irradiation), which differ greatly from conducting (i.e., metals) and insulating materials. In insulators and semiconductors, the available electronic states are discontinuous, with the existence of a gap between the lower energy states, commonly referred to as the valence band (VB), and the higher energy states, known as the conduction band (CB). The distinguishing factor between these materials is the size of the energy difference between the highest energy state in the VB and the lowest energy state in the CB, called the band gap. In insulators, the band gap is very large, making it difficult, if not impossible, to cause an electron to move from the VB to the CB. By comparison, semiconductors possess narrow to moderate band gaps, implying that it is possible to introduce enough energy to an electron to cause it to move from the VB to the CB, enabling electron transfer, the use of high energy electrons, or the emission of energy (i.e., photons) when the electron returns from the CB to the VB. The wide range of industrial application-specific requirements demands versatility in the target characteristics of semiconductor materials (e.g., size, morphology, composition, band gap, emission wavelength), which are vastly different from those commonly used in thin-film transistors. Typically, the semiconductor materials synthesized for use in the above applications are particulate materials produced across a range of sizes spanning five orders of magnitude (from just a few nm to hundreds of µm), and can be divided into two overarching categories, nano-and microsized particulate materials. Nanosized semiconductor materials, due in large part to their miniscule dimensions, present a variety of intriguing characteristics not observed in microsized semiconductor particles. First and foremost, if the dimensions of the semiconductor material decrease below a certain threshold known as the Bohr radius, the absorption and emission energies become highly dependent on the particle size, a phenomenon known as quantum confinement. [28-30] Moreover, nanosized structures have significantly larger surface-to-volume ratios which increases the surface contribution to the total free energy of the semiconductor materials, making them highly soluble [29] and therefore much easier to process and handle. Thus far, nanosized semiconductor particles have been effectively utilized in sensors, [7] LEDs, [9] Controlled synthesis of semiconductor nano/microparticles has attracted sub stantial attention for use in numerous applications from photovoltaics to photo catalysis and bioimaging due to the breadth of available physicochemical and optoelectronic properties. Microfluidic material synthesis strategies have recently been demonstrated as an effective technique for rapid development, controlled synthesis, and continuous manufacturing of solutionpr...

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Continuous synthesis of hedgehog-like Ag–ZnO nanoparticles in a two-stage microfluidic system

Abstract: Hedgehog-like Ag–ZnO nanoparticles were successfully prepared in a continuous microfluidic system and showed a superior photocatalytic activity in the degradation of methyl orange.

Cited by 26 publications

References 44 publications

Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

Growth behavior of water dispersed MgAl layered double hydroxide nanosheets

Green Synthesized Magnetic Nanoparticles as Effective Nanosupport for the Immobilization of Lipase: Application for the Synthesis of Lipophenols

Microfluidic Synthesis of Semiconductor Materials: Toward Accelerated Materials Development in Flow

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