科研之友
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<正>Surface charges are ubiquitous in nature and their existence is in many forms. For example, at macro-length scale, by contacting and separating two objects, i.e., contact electrification, one is able to obtain static surface charges. At micro-length scale, electric charges can be found at the air–water interface of a microdroplet because of the triboelectric effect or ionization from high-voltage spray fission. Although static surface charge is a familiar subject,much still remains unknown about how and why such charges form. Contact charge exchange between two metals is known to
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