Abstract: Disclosed is a method for producing an electrolytic capacitor, the method including the steps of: preparing an anode foil that includes a dielectric layer, a cathode foil, and a fiber structure; preparing a conductive polymer dispersion liquid that contains a conductive polymer component and a dispersion medium; producing a separator by applying the conductive polymer dispersion liquid to the fiber structure and then removing at least a portion of the dispersion medium; and producing a capacitor element by sequentially stacking the anode foil, the separator, and the cathode foil. The dispersion medium contains water. The fiber structure contains a synthetic fiber in an amount of 50 mass % or more. The fiber structure has a density of 0.2 g/cm3 or more and less than 0.45 g/cm3.

Abstract: An electrolytic capacitor includes a capacitor element and a liquid component. The capacitor element includes an anode body including a dielectric layer on a surface of the anode body, and a solid electrolyte layer covering at least a part of a surface of the dielectric layer. The solid electrolyte layer contains a conductive polymer component, and the liquid component contains a first polymer component. The first polymer component includes a carbon chain whose main chain does not contain a heteroatom at a position other than a terminal of the main chain. Units constituting the first polymer component include at least one first unit selected from the group consisting of a (meth)acrylic acid-based unit having a carboxy group and a vinyl alcohol-based unit having a hydroxy group. A proportion of the at least one first unit in an entirety of the units constituting the first polymer component is more than 50 mass %.

Abstract: Disclosed is a method for producing an electrolytic capacitor, the method including the steps of preparing an anode foil that includes a dielectric layer, a cathode foil, and a fiber structure; preparing a conductive polymer dispersion liquid that contains a conductive polymer component and a dispersion medium; producing a separator by applying the conductive polymer dispersion liquid to the fiber structure and then removing at least a portion of the dispersion medium; and producing a capacitor element by sequentially stacking the anode foil, the separator, and the cathode foil. The dispersion medium contains water. The fiber structure contains a synthetic fiber in an amount of 50 mass % or more. The fiber structure has a density of 0.2 g/cm3 or more and less than 0.45 g/cm3.

Abstract: A sample observation method and sample observation device of the present invention are for observing variation in surface potential of a sample due to variation in the Hall effect based on variation in an applied current or applied magnetic field to the sample, and allow the variation in the Hall effect generated in the sample to be locally observed. The Hall effect varies depending on internal structures, electronic states, etc. of the sample. The variation in surface potential due to variation in the Hall effect includes information on internal structures, electronic states, etc. of the sample.