非熱平衡プラズマが持つナノ粒子分散液に対する凝集抑制効果

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  • ヒネツ ヘイコウ プラズマ ガ モツ ナノ リュウシ ブンサンエキ ニ タイスル ギョウシュウ ヨクセイ コウカ

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Abstract

Nanoparticles have received much attention in recent years due to its remarkable properties, which offer important economic benefits and has been used in diverse applications. However, their property gradually decays because of coagulation, which means that adhesion between nanoparticles. Therefore, a superior technique which maintains dispersion of nanoparticles is desired in order to maintain its high performance in liquid. In this study, nonthermal plasma was irradiated to ZrO2 nanoparticles dispersion to suppress coagulation of ZrO2 nanoparticles. As the results, a sufficient coagulation suppression effect was obtained in the ZrO2 dispersion. In addition, the coagulation suppression effect and dispersibility were further improved by changing the processing conditions, such as using combination of nonthermal plasma irradiation and ultrasonic treatment, modifying the electrode geometry. Furthermore, the amount of ·OH production after nonthermal plasma irradiation and coagulation suppression time were compared to clarify the coagulation suppression effect. Zeta potential was also measured to analyze the change of the charge on nanoparticles surface at the same time. In conclusion, it was suggested that the surface modification by ·OH plays an important role in coagulation suppression effect in this study.

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