Tailoring bismuth oxide flower-, bowtie- and brushwood-like structures through microfluidic synthesis

Yolchinyan, Srbuhi A.; Hobosyan, Mkhitar; Martirosyan, Karen S.

doi:10.1016/j.matchemphys.2017.12.073

Cited by 14 publications

(9 citation statements)

References 25 publications

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“…For bismuth, cerium, and gC 3 N 4 , n value is ½. A plot of ( αh υ) 1/2 vs ( hυ ) was drawn and the bandgap energy (E g ) value was obtained by extending the straight line range of these plots 25 . Figure 5A,B show the UV spectra and the Tauc plot of the prepared samples, respectively.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

Devi

Mathew

Rajan

et al. 2020

Int J Applied Ceramic Tech

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An effective and facile phytogenic method was used to prepare CeO2/Bi2O3 and CeO2/Bi2O3/gC3N4 composites using Eichhornia crassipes phytoextract. The synthesized catalysts were characterized using techniques such as XRD, FTIR, UV‐DRS, PL, SEM‐EDAX, XPS, zeta potential, and TGA. These catalysts showed diverse photocatalytic and optical properties due to the alteration in the bandgap. The synthesized composites exhibited good photocatalytic activity by degrading Malachite green (MG) dye. The increase in the photocatalytic activity could be attributed to the p‐n heterojunction of the catalysts with efficient charge separation and strong oxidative ability. The modified photocatalysts showed excellent catalytic activity and reusability under visible light. The superior efficiency and its applications in environmental remediation make these catalysts a potential candidate for photocatalysis.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

Devi

Mathew

Rajan

et al. 2020

Int J Applied Ceramic Tech

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“…Furthermore, in flow microparticle synthesis is not limited solely to microspheres fabricated using flow-focusing geometries. Yolchinyan et al [116] demonstrated the facile synthesis of bismuth(III) oxide (Bi 2 O 3 ) microparticles through the reaction of aqueous bismuth(III) nitrate pentahydrate with NaOH in a single-phase microfluidic flow format with exceptionally short residence times (13 s). It was demonstrated that the presence of polyethylene glycol surfactants of varying chain lengths (200 MW to 8000 MW) resulted in the formation of several different morphologies, including "flower-," "bowtie-," and "brushwood-type" morphologies ( Figure 4F).…”

Section: Metal Oxide Microparticlesmentioning

confidence: 99%

“…The oxidation activity of the in-flow synthesized microparticles was then explored, and was demonstrated to be similar to the state-of-the art literature values. [116] The relatively few metal oxide compositions synthesized using microfluidic techniques leaves room for further exploration into the synthesis of a wide variety of metal oxide microparticles with many other compositions, particularly with the recent advances in solution-phase synthetic strategies. In particular, the ability to utilize other solvents and the development of a fully oxidative synthetic strategy allows for generalization of microfluidic techniques to other interesting oxide materials, including doped TiO 2 , single-step synthesis of chalcogenide@ metal oxide microparticles, and other intriguing oxides or oxide mixtures.…”

Section: Metal Oxide Microparticlesmentioning

confidence: 99%

“…I) diagram of the flow-focusing microreactor with in situ UV photocrosslinking, II) graph of surface areas achieved at various TBT and ETPTA concentraions, III) SEM images of TiO 2 microparticles synthesized using the oxidative pathway (adapted with permission. [66] Copyright 2020, Royal Society of Chemistry [116] Copyright 2018, Elsevier).…”

Section: Chalcogenidesmentioning

confidence: 99%

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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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“…The high energy ball milling allows to receive iodine pentoxide nano-rods [12] and bismuth hydroxide sub-micrometer and nano-sized particles [28], while bismuth oxide can be received at nano-scale using solution combustion method [13]. Bismuth oxide and hydroxide with various shape and size can be received using microfluidic synthesis approach [36].…”

Section: Preparation Of Iodine and Bismuth Based Oxidizers At Nano-scalementioning

confidence: 99%

Tuning the Reactivity of Nano-energetic Gas Generators Based on Bismuth and Iodine Oxidizers

Hobosyan

Martirosyan

2018

Energy, Environment, and Sustainability

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There is a growing interest on novel energetic materials called Nanoenergetic Gas-Generators (NGGs) which are potential alternatives to traditional energetic materials including pyrotechnics, propellants, primers and solid rocket fuels. NGGs are formulations that utilize metal powders as a fuel and oxides or hydroxides as oxidizers that can rapidly release large amount of heat and gaseous products to generate shock waves. The heat and pressure discharge, impact sensitivity, long term stability and other critical properties depend on the particle size and shape, as well as assembling procedure and intermixing degree between the components. The extremely high energy density and the ability to tune the dynamic properties of the energetic system makes NGGs ideal candidates to dilute or replace traditional energetic materials for emerging applications. In terms of energy density, performance and controllability of dynamic properties, the energetic materials based on bismuth and iodine compounds are exceptional among the NGGs. The thermodynamic calculations and experimental study confirm that NGGs based on iodine and bismuth compounds mixed with aluminum nanoparticles are the most powerful formulations to date and can be used potentially in microthrusters technology with high thrust-to-weight ratio with controlled combustion and exhaust velocity for space applications.The resulting nano thermites generated significant value of pressure discharge up to 14.8 kPa m 3 /g. They can also be integrated with carbon nanotubes to form laminar composite yarns with high power actuation of up to 4700 W/kg, or be used in other emerging applications such as biocidal agents to effectively destroy harmful bacteria in seconds, with 22 mg/m 2 minimal content over infected area.

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Tailoring bismuth oxide flower-, bowtie- and brushwood-like structures through microfluidic synthesis

Cited by 14 publications

References 25 publications

Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

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

Tuning the Reactivity of Nano-energetic Gas Generators Based on Bismuth and Iodine Oxidizers

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Tailoring bismuth oxide flower-, bowtie- and brushwood-like structures through microfluidic synthesis

Cited by 14 publications

References 25 publications

Synthesis and characterization of CeO2/Bi2O3/gC3N4 ternary Z‐scheme nanocomposite

Synthesis and characterization of CeO2/Bi2O3/gC3N4 ternary Z‐scheme nanocomposite

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

Tuning the Reactivity of Nano-energetic Gas Generators Based on Bismuth and Iodine Oxidizers

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Product

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Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite

Synthesis and characterization of CeO₂/Bi₂O₃/gC₃N₄ ternary Z‐scheme nanocomposite