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Sparking potential over 1200 V by a falling water droplet.

ABSTRACT: Hydrovoltaic technology has achieved notable breakthroughs in electric output via using the moving boundary of electric double layer, but the output voltage induced by droplets is saturated around 350 volts, and the underlying mechanism remains to be further clarified. Here, we show that falling water droplets can stably spark an unprecedented voltage up to 1200 volts within microseconds that they contact an electrode placed on top of an electret surface, approaching the theoretical upper limit. This sparking potential can be explained and described by a comprehensive model considering the water-electrode contact dynamics from both the macroscale droplet spreading and the microscale electric double layer formation, as well as the presence of a circuit capacitance. It is demonstrated that a droplet-induced electric spark is sufficient to directly ionize gas at atmospheric pressure and split water into hydrogen and oxygen, showing wide application potential in fields of green energy and intelligence.

SUBMITTER: Li L

PROVIDER: S-EPMC10651119 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature

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Sparking potential over 1200 V by a falling water droplet.

Li Luxian L Li Xuemei X Deng Wei W Shen Chun C Chen Xinhai X Sheng Han H Wang Xiang X Zhou Jianxin J Li Jidong J Zhu Yinlong Y Zhang Zhuhua Z Yin Jun J Guo Wanlin W

Science advances 20231115 46

Hydrovoltaic technology has achieved notable breakthroughs in electric output via using the moving boundary of electric double layer, but the output voltage induced by droplets is saturated around 350 volts, and the underlying mechanism remains to be further clarified. Here, we show that falling water droplets can stably spark an unprecedented voltage up to 1200 volts within microseconds that they contact an electrode placed on top of an electret surface, approaching the theoretical upper limit. ...[more]

PMID: 37967189

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Project description:Fear of falling (FoF) was described as a dichotomy, whereby FoF on one hand posed a threat to the sense of security but on the other hand provided protection against harm through increased awareness and cautious behaviour. These findings contribute to a deeper understanding of FoF for women with osteoporosis.IntroductionFear of falling is a major problem for many individuals in society and it increases with age; it is more common among women, especially women with a diagnosis of osteoporosis. It is important to gain a deeper understanding of the concept of fear of falling among women with osteoporosis to be able to devise fall prevention programmes to address fear of falling in the most appropriate way. Therefore, we aimed to explore and describe how older women with osteoporosis and self-reported balance deficits conceptualise their fear of falling METHODS: A qualitative study with individual interviews was carried out, using a semi-structured interview guide. The interviews were recorded, transcribed verbatim, and analysed with inductive qualitative content analysis. The study includes 25 informants, all women with osteoporosis aged 66-85 years.ResultsThe analysis resulted in one overarching theme, "Fear of falling is a protection and danger", and three main themes: "Fear of falling is a sense of unease", "Fear of falling is to be vulnerable", and "Fear of falling is a call for help".ConclusionThe concept of fear of falling was perceived in terms of emotional states as well as cognitive and active strategies and was described in the context of being able to protect oneself in order to stay safe and secure. The concept was described as a dichotomy, whereby fear of falling on the one hand posed a threat to the sense of security but on the other hand provided protection against harm through increased awareness and cautious behaviour. These findings contribute to a deeper understanding of the phenomenon of fear of falling and how it could be seen from both a positive and negative perspective.

Dataset Information

Sparking potential over 1200 V by a falling water droplet.

Publications

Sparking potential over 1200 V by a falling water droplet.

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