Hua Er, Yukang Bai, Muneyuki Matsuo, Satoshi Nakata
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引用次数: 0
Abstract
We investigated oscillatory motion of a camphor disk floating on water containing 5 mM hexylethylenediaminium trifluoroacetate (HHexen-TFA) as an ionic liquid (IL). The frequency of the oscillatory motion increased with increasing concentrations of the transition metal ions Cu2+ and Ni2+ but was insensitive to Na+, Ca2+, and Mg2+, the typical metal ions in the water phase. The surface tension of the water phase containing 5 mM HHexen-TFA also increased with increasing concentrations of Cu2+ and Ni2+ but was insensitive to Na+, Ca2+, and Mg2+. Based on density functional theory, metal-ion species-dependent frequency response is discussed with regard to surface tension as the force of self-propulsion and complex formation between HHexen-TFA and metal ions. These results suggest that complex formation between the transition metal ions (Cu2+, Ni2+) and the ethylenediamine group in the IL increases the surface tension around the camphor disk, resulting in an increase in the frequency of oscillatory motion with increasing concentrations of Cu2+ or Ni2+. The present study suggests that the nature of self-propulsion can be created by complexation, which changes the force of self-propulsion.
我们研究了悬浮在含有5毫米六乙基三氟乙酸二胺(HHexen-TFA)作为离子液体(IL)的水中的樟脑盘的振荡运动。振荡频率随过渡金属离子Cu2+和Ni2+浓度的增加而增加,但对水相典型金属离子Na+、Ca2+和Mg2+不敏感。含有5 mM HHexen-TFA的水相表面张力随Cu2+和Ni2+浓度的增加而增加,但对Na+、Ca2+和Mg2+不敏感。基于密度泛函理论,从表面张力作为自推进力和HHexen-TFA与金属离子之间形成络合物的角度,讨论了金属离子种类相关的频率响应。这些结果表明,过渡金属离子(Cu2+, Ni2+)与IL中的乙二胺基团之间形成的络合物增加了樟脑盘周围的表面张力,导致振荡运动的频率随着Cu2+或Ni2+浓度的增加而增加。本研究表明,自推进的性质可以通过络合作用产生,络合作用改变了自推进的力量。
期刊介绍:
An essential criterion for acceptance of research articles in the journal is that they provide new physical insight. Please refer to the New Physical Insights virtual issue on what constitutes new physical insight. Manuscripts that are essentially reporting data or applications of data are, in general, not suitable for publication in JPC B.