Blar i Bergen Open Research Archive på forfatter "Helseth, Lars Egil"
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The influence of microscale surface roughness on water-droplet contact electrification
Helseth, Lars Egil (Peer reviewed; Journal article, 2019)When water comes in contact with a hydrophobic fluoropolymer, a triboelectric charge tends to form on the surface. Here, it is investigated how the triboelectric charge formed upon contact with water drops depends on the ... -
Influence of Salt Concentration on Charge Transfer When a Water Front Moves across a Junction between a Hydrophobic Dielectric and a Metal Electrode
Helseth, Lars Egil (Journal article; Peer reviewed, 2020)An energy-harvesting device based on water moving across the junction between a hydrophobic dielectric and a metal electrode is demonstrated. The charge transfer due to contact electrification as the junction is dipped ... -
Modelling supercapacitors using a dynamic equivalent circuit with a distribution of relaxation times
Helseth, Lars Egil (Peer reviewed; Journal article, 2019)Supercapacitors are often modelled using electrical equivalent circuits with a limited number of branches. However, the limited number of branches often cannot explain long-term dynamics, and one therefore has to resort ... -
Triboelectric proximity and contact detection using soft planar spiral electrodes
Helseth, Lars Egil (Peer reviewed; Journal article, 2019-08-02)In this study, planar spiral electrodes for triboelectric contact and proximity detection are investigated. The spiral electrodes are created using liquid metal in a soft elastomer in order to make the sensor flexible and ... -
A water droplet-powered sensor based on charge transfer to a flow-through front surface electrode
Helseth, Lars Egil (Journal article; Peer reviewed, 2020)A water droplet sensor based on a flow-through front surface electrode is demonstrated. It is shown that a triboelectric nanogenerator based on a metal-dielectric junction can be utilized to construct simple, self-powered ...