In situ Investigation of Microwave Impacts on Ethylene Glycol Aqueous Solutions

Asakuma, Yusuke; Matsumura, Shungo; Asada, Masahiro; Phan, Chi

doi:10.1007/s10765-017-2343-2

Cited by 11 publications

(10 citation statements)

References 17 publications

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“…Despite the promising preliminary studies mentioned above, some research questions still exist. e synergistic effect of microwave and EG addition could be con rmed, and the mechanisms of the combined e ect were hypothesized in our previous study (Asakuma et al, 2018b). However, the ndings from the aforementioned study were limited to an irradiation power of up to 300 W; therefore, the synergistic e ect should be further investigated and con rmed for irradiation power higher than 300 W. Moreover, the use of an alternative antisolvent, i.e., other than EG, and its comparative performances, have not been investigated.…”

Section: Introductionmentioning

confidence: 62%

“…Accordingly, the addition of an antisolvent has recently been proposed to address the above-mentioned issues (Asakuma and Miura, 2014;Asakuma et al, 2014). Our previous study (Asakuma et al, 2018b) also con rmed the synergistic e ect of microwave and ethylene glycol (EG) addition to achieve more stable particle formation and preventing superheating. In this study, the synergistic e ect was tested and reported to be working satisfactorily for the microwave powers up to 300 W. e pro les of the particle sizes under microwave irradiation were used to identify the maximum bubble size during the heating, and this maximum size was employed as an indicator of whether bumping behavior existed (Asakuma et al, 2017a(Asakuma et al, , 2018a.…”

Section: Introductionmentioning

confidence: 76%

“…ese higher boiling points are hypothesized to be favorable properties to potentially suppress superheating. Moreover, because of high absorbance properties of EG and Gly, the microwave-induced dispersion of solute molecules can be sustained (Asakuma et al, 2018b). For example, the dielectric constants of EG and Gly are 38.7 and 47.0, respectively, and their microwave-absorbance properties are almost the same.…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, extended exposure to high irradiation power may result in melted particles, depending on the skin depth. In the case of nanoparticle synthesis using aqueous solution, we previously reported that bubbles were generated around the nuclei because of quick evaporation of the solvent under microwave irradiation (Asakuma et al, 2017a;Asakuma et al, 2018b). Larger bubbles are produced at higher power, and this phenomenon becomes more observable at extremely higher powers at which bumping behavior occurs.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Effect of High Irradiation Power and Antisolvent Addition for Enhanced Microwave Assisted Nanoparticle Synthesis Process

Shibatani

Kan

Matsumura

et al. 2020

J. Chem. Eng. Japan

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To promote nucleation in nanoparticle synthesis, high-power operation is desirable. However, at high power, heat generation due to the rapid microwave absorbance of particles often results in rapid bubble growth, unstable nucleation, and superheating. Therefore, a trade-o between suppressing superheating and producing stable and ner nanoparticles is necessary. This study aims to investigate and con rm the synergistic e ect between the high power of microwaves and addition of different types of antisolvents. Results show that the addition of an antisolvent prevents superheating and produces ne-sized particles at high-power operation. In addition, it was observed that glycerin is a better antisolvent than ethylene glycol.

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Section: Introductionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 76%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synergistic Effect of High Irradiation Power and Antisolvent Addition for Enhanced Microwave Assisted Nanoparticle Synthesis Process

Shibatani

Kan

Matsumura

et al. 2020

J. Chem. Eng. Japan

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“…Evaporation of liquid (a) conventional pool-boiling vs. (b) microwave/hot airflow.One of the most interesting features of the microwave/hot airflow-assisted evaporation method is that selective evaporation of liquid mixtures, such as water/glycol(Asakuma et al, 2018) and water/glycerol …”

mentioning

confidence: 99%

Selective evaporation of a butanol/water droplet by microwave irradiation, a step toward economizing biobutanol production

et al. 2020

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Selective evaporation of a butanol/water droplet by microwave irradiation, a strategy to economize biobutanol production.Journal homepage: www.biofueljournal.com HIGHLIGHTS ➢Surface and evaporation of alcohol/water was studied in-situ in response to microwave irradiation. ➢Butanol content in liquid phase was reduced by approx. 90%. ➢Similar trend was observed with pentanol/water droplet. ➢The method could be applied to improve efficiency of fermentative butanol separation. GRAPHICAL ABSTRACT ARTICLE INFO ABSTRACT Article history:The separation step is a constraint in biobutanol production, due to high energy consumption of the current techniques. This study explores a new separation method via applying microwave irradiation. Butanol/water droplet was monitored during exposure to microwave irradiation at different power rates. The surface tension, droplet volume, and temperature were scrutinized during and after exposure to microwave irradiation. The data obtained indicated that the microwave-induced evaporation rates of alcohols were much higher than that of water. Consequently, the vaporized phase contained a much higher alcohol content than the liquid phase. In particular, butanol concentration in the aqueous phase could be reduced to ~ 0.1 wt.%, which was more effective than the theoretical limit via the boiling process. The method is an attractive option to complement the fermentation process, which produces a low butanol concentration solution. This development could potentially lead to a more efficient pathway for biobutanol production. Selective evaporation of a butanol/water droplet by microwave irradiation, a strategy to economize biobutanol production.

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A Facile Microwave‐Assisted Method to Prepare Highly Electrosorptive Reduced Graphene Oxide/Activated Carbon Composite Electrode for Capacitive Deionization

Lai

Liu

Chung

et al. 2019

Adv Materials Technologies

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Reduced graphene oxide (rGO)/activated carbon (AC) composites with a hierarchically porous structure are prepared in the presence of ethylene glycol (EG) under microwave irradiation and exhibit excellent electrosorption properties. In this novel microwave‐assisted process, EG plays multiple roles such as solvent, GO reducing reagent, microwave absorber, rGO aggregation preventer, and surface wettability enhancer. In addition, the reaction system can be rapidly heated owing to the high dissipation factor of EG. As a result, GO can be rapidly reduced and in situ uniformly deposited on the AC surface. 3D porous structures can be obtained due to the explosion of the functional groups in GO. Additionally, EG causes electrostatic repulsion between the rGO layers, thereby preventing aggregation and forming a 3D hierarchical structure. Furthermore, the ethanedial that stems from oxidized ethylene glycol interacts with the graphene sheets, enhancing the wettability and conductivity of the composite electrodes, and subsequently increasing the efficiency of the charge‐transfer process. rGO/AC composites electrode fabricated using this process exhibit an outstanding electrosorption capacity of 18.6 ± 1.2 mg g−1, making them an excellent candidate for industrial applications.

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In situ Investigation of Microwave Impacts on Ethylene Glycol Aqueous Solutions

Cited by 11 publications

References 17 publications

Synergistic Effect of High Irradiation Power and Antisolvent Addition for Enhanced Microwave Assisted Nanoparticle Synthesis Process

Synergistic Effect of High Irradiation Power and Antisolvent Addition for Enhanced Microwave Assisted Nanoparticle Synthesis Process

Selective evaporation of a butanol/water droplet by microwave irradiation, a step toward economizing biobutanol production

A Facile Microwave‐Assisted Method to Prepare Highly Electrosorptive Reduced Graphene Oxide/Activated Carbon Composite Electrode for Capacitive Deionization

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