Mechanism of Microwave Heating through Molecular Orbital Method and Bubble Size Profiles

Asakuma, Yusuke; Nakata, Ryosuke; Matsumura, Shungo; Saptoro, Agus

doi:10.1016/j.proeng.2016.08.332

Cited by 6 publications

(18 citation statements)

References 19 publications

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“…In our previous studies, [ 35–39 ] microwave‐assisted nanoparticle formation was also found to be an effective process intensification technique in obtaining mono‐disperse fine particles. For nanoparticle synthesis, microwave heating is favorable compared to conventional heating due its rapid heating resulting to shorter operating time, homogeneous nucleation, higher yield and purity and more environmentally friendly, energy efficient and cost‐effective process.…”

Section: Introductionmentioning

confidence: 99%

“…For nanoparticle synthesis, microwave heating is favorable compared to conventional heating due its rapid heating resulting to shorter operating time, homogeneous nucleation, higher yield and purity and more environmentally friendly, energy efficient and cost‐effective process. [ 35 ] These advantages can be further promoted by two‐stage irradiation, [ 39 ] addition of anti‐solvent [ 37 ] and hybrid two‐stage irradiation and anti‐solvent addition [ 38 ] to avoid superheating behaviors. Despite the proven benefits above, some issues pertinent to having more stable microwave operation still remain.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental works on in‐situ nano‐sized measurement of size profiles reported the significant roles of bubble formation in ensuring stable microwave operation. [ 35 ] Although higher microwave energy concentration is desirable to maximize microwave effects, [ 35–39 ] higher power especially at longer irradiation time generate larger bubbles and these bubbles will stimulate bumping behavior. Moreover, long‐term irradiation exposure of solid‐air interface may result in particle melting.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, since bubble formation is unavoidable, generated bubbles in large numbers may be considered to play roles in better distributing the microwave energy. If not only higher number density of particle, [ 35 ] but also higher number density of bubble can be achieved, the absorbance energy will also be distributed to the interfaces of liquid‐air and liquid‐solid, where microwave is strongly and preferentially absorbed. Thus, promoting both particle and bubble nucleation may be an effective way to reduce microwave absorbance energy in each particle due to the higher number densities of particles and bubbles.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Intensified Nanoparticle Synthesis Using Hybrid Microwave and Ultrasound Treatments: Consecutive and Concurrent Modes

Shibatani

Kan

Asakuma

et al. 2020

Crystal Research and Technology

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Bubble formation around nucleated particle is inevitable when quick heating of microwave is employed in nanoparticle synthesis. Since these bubbles may cause bumping behavior, the bubble growth must be possibly suppressed to ensure stable microwave‐assisted operation. In this study, sequential and simultaneous ultrasound treatment and microwave irradiations on nanoparticle synthesis are proposed and investigated to assess the benefit of ultrasound in preventing superheating behavior and producing finer particles. Experimental results indicate that the inclusions of ultrasound treatment result in finer particle sizes and suppression of bumping behavior. Particularly, consecutive ultrasound treatment and microwave irradiation are recommendable due to its practicality and generating smallest bubbles and final particle sizes. This technique can therefore be expected as an innovative way to enhance industrial applications of quick thermal response induced by microwave.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Intensified Nanoparticle Synthesis Using Hybrid Microwave and Ultrasound Treatments: Consecutive and Concurrent Modes

Shibatani

Kan

Asakuma

et al. 2020

Crystal Research and Technology

Self Cite

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“…Owing to its excellent capabilities to produce mono‐disperse fine particles, nano‐crystalline and novel physical properties, the microwave‐assisted process has been extensively employed in synthesizing nanoparticles. Many publications on nanoparticle formation using microwave‐assisted techniques can be found in the literature in the last 10 years .…”

Section: Introductionmentioning

confidence: 99%

Promoting Nucleation in Microwave‐Assisted Nanoparticle Synthesis Using Combined Two‐Stage Irradiation and Anti‐Solvent Addition

Shibatani

Matsumura

Asakuma

et al. 2019

Crystal Research and Technology

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Microwave is advantageous for nanoparticle synthesis because nanostructured crystals and mono-dispersed nanoparticle size can be obtained due to the rapid growth induced by quick thermal response. In previous studies, it has been confirmed that an individual application of two-stage irradiation and anti-solvent addition is effective in promoting stable nucleation and smaller particle generation. Nevertheless, to date no studies have been reported in applying the two methods above simultaneously and examining their synergistic effect. This study, therefore, aims to investigate the possibility of producing finer particles using a stable operation without any superheating and abrupt bubble growth. From the experimental data, it is evident that the beneficial combined effect of two-stage irradiation and addition of anti-solvent on the stable finer nanoparticle formation could be observed and confirmed. It is expected that the findings and recommendations from this work may be useful in optimizing two-stage microwave-assisted nanoparticle synthesis with an addition of anti-solvent.

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Microwave‐Irradiated Green Synthesis of a Silver/Zinc Oxide Nanocomposite from Atalantia monophylla (L.) Leaf Extract

Verma

Khan

2021

Chem Eng & Technol

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A silver/zinc oxide nanocomposite (Ag/ZnONC) was synthesized using the aqueous leaf extract of Atalantia monophylla as a reducing and capping agent, under controlled and effective microwave heating with silver nitrate (AgNO 3 ) and zinc nitrate hexahydrate (ZnNO 3 Á6H 2 O) serving as precursor salts. The X-ray diffraction spectra peak and selective area electron diffraction patterns confirmed the crystalline nature of the synthesized nanocomposite particles. High-resolution scanning electron microscopy images and high-resolution transmission electron microscopy micrographs of Ag/ZnONC showed an aggregated net-like structure containing small spherical Ag nanoparticles (AgNPs) supported by the large aggregated ZnO nanoparticles (ZnONPs). The eco-friendly synthesized Ag/ZnONC shows great relevance in areas like photonics, catalysis, electronics, and biomedicals.

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Mechanism of Microwave Heating through Molecular Orbital Method and Bubble Size Profiles

Cited by 6 publications

References 19 publications

Intensified Nanoparticle Synthesis Using Hybrid Microwave and Ultrasound Treatments: Consecutive and Concurrent Modes

Intensified Nanoparticle Synthesis Using Hybrid Microwave and Ultrasound Treatments: Consecutive and Concurrent Modes

Promoting Nucleation in Microwave‐Assisted Nanoparticle Synthesis Using Combined Two‐Stage Irradiation and Anti‐Solvent Addition

Microwave‐Irradiated Green Synthesis of a Silver/Zinc Oxide Nanocomposite from Atalantia monophylla (L.) Leaf Extract

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